Dolzodmaa Boldbaatar, Y. Osanai, N. Nakano, T. Adachi, Jargalan Sereenen, Ippei Kitano, Kundyz Syeryekkhaan
{"title":"Geochronology and geochemistry of granitoids from the Mongolian Altai","authors":"Dolzodmaa Boldbaatar, Y. Osanai, N. Nakano, T. Adachi, Jargalan Sereenen, Ippei Kitano, Kundyz Syeryekkhaan","doi":"10.2465/jmps.210830","DOIUrl":"https://doi.org/10.2465/jmps.210830","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study presents fi rst report of the sulfur isotopic compositions of carbonatites from the Mesoproterozoic Newania complex of India along with their stable C and O isotope ratios. The δ 34 S V – CDT ( − 1.4 to 2 ‰ ) and Δ 33 S ( − 0.001 to − 0.13 ‰ ) values of these carbonatite samples (n = 7) overlap with the S isotope compositions of Earth ’ s mantle. Additionally, the δ 13 C V – PDB and δ 18 O V – SMOW values of these carbonatites also show overlapping compositions to that of Earth ’ s mantle. Based on these mantle – like stable isotopic compositions of carbonatites along with their higher crystallization temperature (~ 600 °C) compared to a hydrothermal fl uid (<250 °C), we suggest that the sul fi de minerals in these carbonatites were formed under a magmatic condition. The mantle like signatures in the δ 34 S, δ 13 C – δ 18 O, and 87 Sr/ 86 Sr values of these carbonatites rule out possible crustal contamination. Coexistence of the sul fi de phase (pyrrhotite) with magnesite in these carbonatites suggests that the sul fi de phase has formed early during the crystallization of carbonatite magmas under reducing conditions. Overall restricted variability in the δ 34 S values of these samples further rules out any isotopic fractionation due to the change in the redox condition of the magma and re fl ect the isotopic composition of the parental melts of the Newania carbonatite complex. A compilation of δ 34 S of carbonatites from Newania and other complexes worldwide indicates limited variability in the isotopic composition for carbonatites older than 400 Ma, which broadly overlaps with Earth ’ s asthenospheric mantle composition. This contrasts with the larger variability in δ 34 S observed in carbonatites younger than 400 Ma. Such observation could suggest an overall lower oxidation state of carbonatite magmas emplaced prior to 400 Ma.
{"title":"Sulfur, carbon and oxygen isotopic compositions of Newania carbonatites of India: implications for the mantle source characteristics","authors":"A. Banerjee, M. Satish‐Kumar, R. Chakrabarti","doi":"10.2465/jmps.201130e","DOIUrl":"https://doi.org/10.2465/jmps.201130e","url":null,"abstract":"This study presents fi rst report of the sulfur isotopic compositions of carbonatites from the Mesoproterozoic Newania complex of India along with their stable C and O isotope ratios. The δ 34 S V – CDT ( − 1.4 to 2 ‰ ) and Δ 33 S ( − 0.001 to − 0.13 ‰ ) values of these carbonatite samples (n = 7) overlap with the S isotope compositions of Earth ’ s mantle. Additionally, the δ 13 C V – PDB and δ 18 O V – SMOW values of these carbonatites also show overlapping compositions to that of Earth ’ s mantle. Based on these mantle – like stable isotopic compositions of carbonatites along with their higher crystallization temperature (~ 600 °C) compared to a hydrothermal fl uid (<250 °C), we suggest that the sul fi de minerals in these carbonatites were formed under a magmatic condition. The mantle like signatures in the δ 34 S, δ 13 C – δ 18 O, and 87 Sr/ 86 Sr values of these carbonatites rule out possible crustal contamination. Coexistence of the sul fi de phase (pyrrhotite) with magnesite in these carbonatites suggests that the sul fi de phase has formed early during the crystallization of carbonatite magmas under reducing conditions. Overall restricted variability in the δ 34 S values of these samples further rules out any isotopic fractionation due to the change in the redox condition of the magma and re fl ect the isotopic composition of the parental melts of the Newania carbonatite complex. A compilation of δ 34 S of carbonatites from Newania and other complexes worldwide indicates limited variability in the isotopic composition for carbonatites older than 400 Ma, which broadly overlaps with Earth ’ s asthenospheric mantle composition. This contrasts with the larger variability in δ 34 S observed in carbonatites younger than 400 Ma. Such observation could suggest an overall lower oxidation state of carbonatite magmas emplaced prior to 400 Ma.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"13 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68831174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ginga Kitahara, A. Yoshiasa, M. Tokuda, T. Tobase, K. Sugiyama
Structural analysis of Ce – and Nb – perovskites containing Fe, Zr, Nb, and rare earth elements (REEs) in CaTiO 3 perovskite was performed using single – crystal X – ray di ff raction and X – ray absorption near – edge structure (XANES) analyses. Based on chemical analysis results, XANES measurements and the site – occupation of elements at A – and B – sites showed the chemical formula: (Ca 2+0.817 REE 3+0.087 Na +0.081 Sr 2+0.005 Th 4+0.003 ) 1.998+0.993 (Ti 4+0.941 Nb 5+0.017 Fe 3+0.013 V 5+0.010 Fe 2+0.007 Sc 3+0.006 Zn 2+0.005 Al 3+0.002 Ge 4+0.001 W 6+0.001 ) 3.996+1.003 O 3 for Ce – perovskite and (Ca 2+0.937 Ce 3+0.021 Na +0.020 La 3+0.015 Sr 2+0.003 ) 2.008+0.996 (Ti 4+0.730 Nb 5+0.122 Fe 3+0.108 Al 3+0.020 Zr 4+0.009 V 5+0.008 ) 3.990+0.997 O 3 for Nb – perovskite. In Ce – and Nb – perovskites, the total charges at the A – and B – sites achieved near – ideal divalent and tetravalent states such as Ca 2+ Ti 4+ O 3 , respectively, due to complex elemental substitutions. Local distortions around Ti in the perovskite solid solutions were greater, and the pre – edge features of the Ti atoms in Ce – and Nb – perovskites were di ff erent from those in pure CaTiO 3 . The valence states and local structures of Fe in Ce – and Nb – perovskites were signi fi cantly di ff erent. The existence of divalent Fe 2+ at the B – site in Ce – perovskite was con fi rmed. It is presumed that the displacement ellipsoids of all atoms and local irregularities in Ce – perovskite increase owing to the radiative decay of the actinoid element Th. We recon fi rmed that the composition and three – dimensional structure of perovskite – type structures were fl exible and caused various electrical, structural changes.
采用单晶X射线衍射和X射线吸收近边结构(XANES)分析方法对ctio3钙钛矿中含有Fe、Zr、Nb和稀土元素(REEs)的Ce和Nb钙钛矿进行了结构分析。根据化学分析结果，XANES测量和元素在A -和B -位点的位置占用显示了化学式:(Ca 2+0.817 REE 3+0.087 Na +0.081 Sr 2+0.005 Th 4+0.003) 1.998+0.993 (Ti 4+0.941 Nb 5+0.017 Fe 3+0.013 V 5+0.010 Fe 2+0.007 Sc 3+0.006 Zn 2+0.005 Al 3+0.002 Ge 4+0.001 W 6+0.001) 3.996+1.003 O 3 (Ca 2+0.937 Ce 3+0.021 Na +0.020 La 3+0.015 Sr 2+0.003) 2.008+0.996 (Ti 4+0.730 Nb 5+0.122 Fe 3+0.108 Al 3+0.020 Zr 4+0.009 V 5+0.008) 3.990+0.997 O 3 (Nb -钙钛矿)在Ce -和Nb -钙钛矿中，由于复杂的元素取代，A位和B位的总电荷分别达到接近理想的二价和四价状态，如ca2 + ti4 + o3。钙钛矿固溶体中Ti周围的局部畸变较大，且Ce -和Nb -钙钛矿中Ti原子的前边缘特征与纯catio3中Ti原子的前边缘特征不同。Fe在Ce -和Nb -钙钛矿中的价态和局部结构有显著差异。证实了钙钛矿中B位存在二价fe2 +。推测Ce -钙钛矿中所有原子的位移椭球体和局部不规则性的增加是由于锕系元素Th的辐射衰变。我们发现钙钛矿型结构的组成和三维结构是柔性的，可以引起各种电学和结构的变化。
{"title":"XANES analyses on minor elements and X–ray single crystal structure analyses of Ce– and Nb–perovskite","authors":"Ginga Kitahara, A. Yoshiasa, M. Tokuda, T. Tobase, K. Sugiyama","doi":"10.2465/JMPS.200424","DOIUrl":"https://doi.org/10.2465/JMPS.200424","url":null,"abstract":"Structural analysis of Ce – and Nb – perovskites containing Fe, Zr, Nb, and rare earth elements (REEs) in CaTiO 3 perovskite was performed using single – crystal X – ray di ff raction and X – ray absorption near – edge structure (XANES) analyses. Based on chemical analysis results, XANES measurements and the site – occupation of elements at A – and B – sites showed the chemical formula: (Ca 2+0.817 REE 3+0.087 Na +0.081 Sr 2+0.005 Th 4+0.003 ) 1.998+0.993 (Ti 4+0.941 Nb 5+0.017 Fe 3+0.013 V 5+0.010 Fe 2+0.007 Sc 3+0.006 Zn 2+0.005 Al 3+0.002 Ge 4+0.001 W 6+0.001 ) 3.996+1.003 O 3 for Ce – perovskite and (Ca 2+0.937 Ce 3+0.021 Na +0.020 La 3+0.015 Sr 2+0.003 ) 2.008+0.996 (Ti 4+0.730 Nb 5+0.122 Fe 3+0.108 Al 3+0.020 Zr 4+0.009 V 5+0.008 ) 3.990+0.997 O 3 for Nb – perovskite. In Ce – and Nb – perovskites, the total charges at the A – and B – sites achieved near – ideal divalent and tetravalent states such as Ca 2+ Ti 4+ O 3 , respectively, due to complex elemental substitutions. Local distortions around Ti in the perovskite solid solutions were greater, and the pre – edge features of the Ti atoms in Ce – and Nb – perovskites were di ff erent from those in pure CaTiO 3 . The valence states and local structures of Fe in Ce – and Nb – perovskites were signi fi cantly di ff erent. The existence of divalent Fe 2+ at the B – site in Ce – perovskite was con fi rmed. It is presumed that the displacement ellipsoids of all atoms and local irregularities in Ce – perovskite increase owing to the radiative decay of the actinoid element Th. We recon fi rmed that the composition and three – dimensional structure of perovskite – type structures were fl exible and caused various electrical, structural changes.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The scale precipitation is a major issue at geothermal power plants as it reduces the production rate of geothermal energy. The scale precipitates at different physical and chemical conditions in each geothermal power plant as a result from a fluid–rock interaction for the specific conditions at each plant. Thus, it is important to understand the chemical characteristics and precipitation process of the scale from geothermal fluid. The information on the process of transportation of metals and its precipitation from hydrothermal fluid in general will be useful to understand the formation of hydrothermal ore deposit. In this study, we have examined the chemical characteristics of silica scaling from the Onuma geothermal power plant at Akita Prefecture, Japan. The scale consists of mainly amorphous silica and trace amounts of smectite, kaolinite, and euhedral pyrite. Chemical composition of silica scale indicates that Fe content scale shows positive correlation with Pb, Cu, and REE. These elements probably incorporate into pyrite in silica scale. The texture of pyrite suggests that pyrite is possible to crystalize prior to the growth of amorphous silica. Silica scale gradually changes its chemical composition from the production well toward the reinjection well. Concentrations of SiO2, Fe2O3, MgO, and MnO in silica scale significantly decrease toward to the reinjection well from the production well, and those of Al2O3, LOI, and alkali and alkali earth elements (Na2O, K2O, and CaO) increase toward to the reinjection well. Most of trace elements including REE in silica scale also significantly decrease toward to the reinjection well, and furthermore HREE decreases more extensively than LREE though alkali and alkali earth elements (Be, Rb, Sr, Cs, and Ba) increase toward to the reinjection well. The change of element concentration in silica scales can be utilized to understand the physical and chemical conditions in the pipes at the geothermal power plant.
{"title":"Geochemical characteristics of silica scales precipitated from the geothermal fluid at the Onuma geothermal power plant in Japan","authors":"M. Fukuyama, Feiyang Chen","doi":"10.2465/jmps.201130b","DOIUrl":"https://doi.org/10.2465/jmps.201130b","url":null,"abstract":"The scale precipitation is a major issue at geothermal power plants as it reduces the production rate of geothermal energy. The scale precipitates at different physical and chemical conditions in each geothermal power plant as a result from a fluid–rock interaction for the specific conditions at each plant. Thus, it is important to understand the chemical characteristics and precipitation process of the scale from geothermal fluid. The information on the process of transportation of metals and its precipitation from hydrothermal fluid in general will be useful to understand the formation of hydrothermal ore deposit. In this study, we have examined the chemical characteristics of silica scaling from the Onuma geothermal power plant at Akita Prefecture, Japan. The scale consists of mainly amorphous silica and trace amounts of smectite, kaolinite, and euhedral pyrite. Chemical composition of silica scale indicates that Fe content scale shows positive correlation with Pb, Cu, and REE. These elements probably incorporate into pyrite in silica scale. The texture of pyrite suggests that pyrite is possible to crystalize prior to the growth of amorphous silica. Silica scale gradually changes its chemical composition from the production well toward the reinjection well. Concentrations of SiO2, Fe2O3, MgO, and MnO in silica scale significantly decrease toward to the reinjection well from the production well, and those of Al2O3, LOI, and alkali and alkali earth elements (Na2O, K2O, and CaO) increase toward to the reinjection well. Most of trace elements including REE in silica scale also significantly decrease toward to the reinjection well, and furthermore HREE decreases more extensively than LREE though alkali and alkali earth elements (Be, Rb, Sr, Cs, and Ba) increase toward to the reinjection well. The change of element concentration in silica scales can be utilized to understand the physical and chemical conditions in the pipes at the geothermal power plant.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pressure–induced phase transitions of tridymite modifications (MC, MX–1, and PO–10) were investigated by in–situ Raman spectroscopy. Starting from MC, a transition to PO–10 was observed at 0.4 GPa. At about 1.6 GPa, new Raman peaks appeared and were observed up to 8.7 GPa. This revealed a new phase, and it reverted to PO–10 at around 0.4 GPa during decompression. Contrary to previous study, PO–10 was recovered to ambient pressure. MX–1 also transformed to PO–10, and PO–10 was recovered. Starting from PO–10, the transition to the new phase was also observed but was gradual and the phase reverted to PO–10 during decompression. Present study revealed a new route to form PO–10 from MC and suggests rare PO–10 found in meteorites could be formed through this route.
{"title":"Raman spectroscopic study of pressure–induced phase transitions in tridymite modifications","authors":"M. Kanzaki","doi":"10.2465/jmps.210729","DOIUrl":"https://doi.org/10.2465/jmps.210729","url":null,"abstract":"Pressure–induced phase transitions of tridymite modifications (MC, MX–1, and PO–10) were investigated by in–situ Raman spectroscopy. Starting from MC, a transition to PO–10 was observed at 0.4 GPa. At about 1.6 GPa, new Raman peaks appeared and were observed up to 8.7 GPa. This revealed a new phase, and it reverted to PO–10 at around 0.4 GPa during decompression. Contrary to previous study, PO–10 was recovered to ambient pressure. MX–1 also transformed to PO–10, and PO–10 was recovered. Starting from PO–10, the transition to the new phase was also observed but was gradual and the phase reverted to PO–10 during decompression. Present study revealed a new route to form PO–10 from MC and suggests rare PO–10 found in meteorites could be formed through this route.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"31 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68831445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Anatomy of Shaku–dake high–Mg diorite, southwest Japan: Lithofacies variations and growth process of high–Mg diorite stock","authors":"K. Eshima","doi":"10.2465/JMPS.200917","DOIUrl":"https://doi.org/10.2465/JMPS.200917","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"116 1","pages":"83-95"},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Otgonbayar Dandar, A. Okamoto, M. Uno, N. Tsuchiya
Magnetite veins are commonly observed in serpentinized peridotite, but the mobility of iron during serpentinization is poorly understood. The completely serpentinized ultrama fi c rocks (originally dunite) in the Taishir Massif in the Khantaishir ophiolite, western Mongolia, contain abundant antigorite + magnetite (Atg + Mag) veins, which show an unusual distribution of Mag. The serpentinite records multi – stage serpentinization in the order: (1) Atg + lizardite (Lz) with a hourglass texture (Atg – Lz); (2) thin vein networks and thick veins of Atg; (3) chrysotile (Ctl) that cuts all earlier textures. Mg# values of the Atg – Lz (0.94 – 0.96) are lower than those of the Atg (~ 0.99) and chrysotile (~ 0.98). In the Atg – Lz regions, magnetite occurs as arrays of fi ne grains (<50 µm) around the hourglass texture, and magnetite is absent in the thin Atg vein networks replacing Atg – Lz. Magnetite occurs as coarse grains (100 – 250 µm) in the center of some thick Atg veins. As the volume ratio of thin Atg veins to Atg – Lz increases, both the modal abundance of Mag and the bulk iron content decrease. These features indicate that hydrogen generation occurred mainly during Atg – Lz formation, and that the Mag distribution was largely modi fi ed by dissolution and precipitation in response to the in fi ltration of the higher temperature fl uids associated with the Atg veins. The transport of iron during redistribution of Mag in the late – stage of serpentinization is potentially important for ore deposit formation and modifying the magnetic properties of ultrama fi c bodies.
{"title":"Redistribution of magnetite during multi–stage serpentinization: Evidence from the Taishir Massif, Khantaishir ophiolite, western Mongolia","authors":"Otgonbayar Dandar, A. Okamoto, M. Uno, N. Tsuchiya","doi":"10.2465/jmps.201130a","DOIUrl":"https://doi.org/10.2465/jmps.201130a","url":null,"abstract":"Magnetite veins are commonly observed in serpentinized peridotite, but the mobility of iron during serpentinization is poorly understood. The completely serpentinized ultrama fi c rocks (originally dunite) in the Taishir Massif in the Khantaishir ophiolite, western Mongolia, contain abundant antigorite + magnetite (Atg + Mag) veins, which show an unusual distribution of Mag. The serpentinite records multi – stage serpentinization in the order: (1) Atg + lizardite (Lz) with a hourglass texture (Atg – Lz); (2) thin vein networks and thick veins of Atg; (3) chrysotile (Ctl) that cuts all earlier textures. Mg# values of the Atg – Lz (0.94 – 0.96) are lower than those of the Atg (~ 0.99) and chrysotile (~ 0.98). In the Atg – Lz regions, magnetite occurs as arrays of fi ne grains (<50 µm) around the hourglass texture, and magnetite is absent in the thin Atg vein networks replacing Atg – Lz. Magnetite occurs as coarse grains (100 – 250 µm) in the center of some thick Atg veins. As the volume ratio of thin Atg veins to Atg – Lz increases, both the modal abundance of Mag and the bulk iron content decrease. These features indicate that hydrogen generation occurred mainly during Atg – Lz formation, and that the Mag distribution was largely modi fi ed by dissolution and precipitation in response to the in fi ltration of the higher temperature fl uids associated with the Atg veins. The transport of iron during redistribution of Mag in the late – stage of serpentinization is potentially important for ore deposit formation and modifying the magnetic properties of ultrama fi c bodies.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Au(Ag) – Sn – Sb – Pb minerals occurring in association with gold, rumoiite (AuSn 2 ), shosanbetsuite (Ag 3 Sn), yuanjiangite (AuSn), aurostibite (AuSb 2 ), and anyuiite (AuPb 2 ), were found from the Shosanbetsu River (the former three), Shosanbetsu village and the Ainusawa River (the latter two), Haboro town, Rumoi province, Hokkaido, Japan. Rumoiite (IMA No. 2018 – 161) and shosanbetsuite (IMA No. 2018 – 162) have been approved as new minerals by the International Mineralogical Association, the Commission on New Minerals, Nomenclature and Classi fi cation (IMA – CNMNC) and named after the locality. Both minerals show anhedral shape at less than 5 µm and occur in close association with one another, yuanjiangite, and native lead in spherical aggregates in placer gold. The densities of rumoiite and shosanbetsuite based on their empirical formulae and powder di ff raction data were calculated to be 10.1 and 11.1 g/cm 3 , respectively. The empirical formulae of rumoiite and shosanbetsuite were (Au 0.95 Ag <0.01 ) Σ 0.96 (Sn 1.93 Sb 0.08 Pb 0.02 Bi 0.01 ) Σ 2.04 (basis of 3 apfu) and (Ag 2.46 Au 0.54 ) Σ 2.99 (Sn 0.97 Sb 0.01 Pb 0.01 Bi 0.01 ) Σ 1.01 (basis of 4 apfu), respectively. Rumoiite is orthorhombic, Pbca , with lattice parameters a = 6.9088(7) Å, b = 7.0135(17) Å, c = 11.7979(19) Å and V = 571.6(2) Å 3 (Z = 8). Shosanbetsuite is orthorhombic, Pmmn , with lattice parameters a = 5.986(8) Å, b = 4.779(3) Å, c = 5.156(6) Å and V = 147.5(3) Å 3 (Z = 2). Rumoiite and shosanbetsuite correspond to the synthetic AuSn 2 and Ag 3 Sn phases, respectively. The chemical compositions for aurostibite, anyuiite, yuanjiangite, and native lead, and the unit cell parameters for yuanjiangite and native lead are also reported in this paper. Hydrothermal activity in ultrama fi c rocks after the formation of gold (electrum) grains may have been involved in the occurrence of Au(Ag) – Sn – Sb – Pb minerals. aurostibite
在日本北海道如梅省哈伯罗镇的松三别苏河(前3种)、松三别苏村和阿伊纽泽河(后2种)中发现了与金、绿辉石(AuSn 2)、松三别苏(Ag 2)、银辉石(AuSb 2)、银辉石(AuPb 2)伴生的Au(Ag) - Sn - Sb - Pb矿物。Rumoiite (IMA No. 2018 - 161)和shosanbetsuite (IMA No. 2018 - 162)已被国际矿物学协会、新矿物、命名法和分类委员会(IMA - CNMNC)批准为新矿物，并以当地命名。这两种矿物在小于5µm处呈反面体状，并与原江矿、原生铅紧密结合，呈球形聚集体赋存于砂金中。根据经验公式和粉末反应数据，计算出黑云母和细山石的密度分别为10.1和11.1 g/ cm3。铝土矿和铁山岩的经验公式分别为(Au 0.95 Ag <0.01) Σ 0.96 (Sn 1.93 Sb 0.08 Pb 0.02 Bi 0.01) Σ 2.04(以3 apfu为基础)和(Ag 2.46 Au 0.54) Σ 2.99 (Sn 0.97 Sb 0.01 Pb 0.01 Bi 0.01) Σ 1.01(以4 apfu为基础)。ruboiite为正晶型Pbca，晶格参数a = 6.9088(7) Å， b = 7.0135(17) Å， c = 11.7979(19) Å， V = 571.6(2) Å 3 (Z = 8)。Shosanbetsuite为正晶型Pmmn，晶格参数a = 5.986(8) Å， b = 4.779(3) Å， c = 5.156(6) Å， V = 147.5(3) Å 3 (Z = 2)。Rumoiite和Shosanbetsuite分别对应合成ausn2和ag3sn相。本文还报道了铜辉石、安辉石、元江石和原生铅的化学成分，元江石和原生铅的单元胞参数。金(银)粒形成后的超岩浆岩石中的热液活动可能参与了Au(Ag) - Sn - Sb - Pb矿物的赋存。aurostibite
{"title":"Au(Ag)–Sn–Sb–Pb minerals in association with placer gold from Rumoi province of Hokkaido, Japan: a description of two new minerals (rumoiite and shosanbetsuite)","authors":"D. Nishio–Hamane, Katsuyuki Saito","doi":"10.2465/jmps.210829","DOIUrl":"https://doi.org/10.2465/jmps.210829","url":null,"abstract":"Au(Ag) – Sn – Sb – Pb minerals occurring in association with gold, rumoiite (AuSn 2 ), shosanbetsuite (Ag 3 Sn), yuanjiangite (AuSn), aurostibite (AuSb 2 ), and anyuiite (AuPb 2 ), were found from the Shosanbetsu River (the former three), Shosanbetsu village and the Ainusawa River (the latter two), Haboro town, Rumoi province, Hokkaido, Japan. Rumoiite (IMA No. 2018 – 161) and shosanbetsuite (IMA No. 2018 – 162) have been approved as new minerals by the International Mineralogical Association, the Commission on New Minerals, Nomenclature and Classi fi cation (IMA – CNMNC) and named after the locality. Both minerals show anhedral shape at less than 5 µm and occur in close association with one another, yuanjiangite, and native lead in spherical aggregates in placer gold. The densities of rumoiite and shosanbetsuite based on their empirical formulae and powder di ff raction data were calculated to be 10.1 and 11.1 g/cm 3 , respectively. The empirical formulae of rumoiite and shosanbetsuite were (Au 0.95 Ag <0.01 ) Σ 0.96 (Sn 1.93 Sb 0.08 Pb 0.02 Bi 0.01 ) Σ 2.04 (basis of 3 apfu) and (Ag 2.46 Au 0.54 ) Σ 2.99 (Sn 0.97 Sb 0.01 Pb 0.01 Bi 0.01 ) Σ 1.01 (basis of 4 apfu), respectively. Rumoiite is orthorhombic, Pbca , with lattice parameters a = 6.9088(7) Å, b = 7.0135(17) Å, c = 11.7979(19) Å and V = 571.6(2) Å 3 (Z = 8). Shosanbetsuite is orthorhombic, Pmmn , with lattice parameters a = 5.986(8) Å, b = 4.779(3) Å, c = 5.156(6) Å and V = 147.5(3) Å 3 (Z = 2). Rumoiite and shosanbetsuite correspond to the synthetic AuSn 2 and Ag 3 Sn phases, respectively. The chemical compositions for aurostibite, anyuiite, yuanjiangite, and native lead, and the unit cell parameters for yuanjiangite and native lead are also reported in this paper. Hydrothermal activity in ultrama fi c rocks after the formation of gold (electrum) grains may have been involved in the occurrence of Au(Ag) – Sn – Sb – Pb minerals. aurostibite","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68831897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Banno, Chihiro Fukuda, N. Shimobayashi, S. Yamada
Lithium – bearing sodium amphibole (Li 2 O = 0.01 – 1.02 wt%) was found in a specimen of schistose manganese ore from the Iimori region in the Sanbagawa metamorphic belt, central Japan. The ore is composed mainly of quartz, albite, amphibole, Na to Na – Ca pyroxene, and braunite. The amphibole occurs as prismatic crystals with lengths of up to 400 µm and consists of a pale – green core and an orange – red rim observed in hand specimen. The chemical formulae of averaged compositions of the core and rim, based on 24(O, OH, F, Cl) with (OH, F, Cl) = (2 − 2Ti) atoms per formula unit, are A (Na 0.468 K 0.448 ) Σ 0.916B (Na 1.586 Ca 0.393 Mn 2+0.021 ) Σ 2.000C (Mg 3.896 Mn 2+0.124 Fe 3+0.657 Al 0.182 Ti 0.031 Li 0.106 Cu 0.004 ) Σ 5.000T (Si 7.936 Al 0.064 ) Σ 8.000 O 22W [(OH) 1.771 F 0.167 O 0.062 ] Σ 2.000 and A (K 0.576 Na 0.428 ) Σ 1.004 B (Na 1.759 Ca 0.241 ) Σ 2.000C (Mg 3.143 Mn 2+0.332 Fe 3+0.782 Al 0.247 Mn 3+0.081 Ti Li Cu ) Si [(OH) O 0.106 ] Σ 2.000 , respectively. Consequently, the core amphibole has an intermediate composition between magnesio – arfvedsonite and potassic – magnesio – arfvedsonite, whereas the rim amphibole is potassic – magnesio – arfvedsonite.
在日本中部三川变质带Iimori地区的片状锰矿石中发现了含锂钠角闪孔(Li 2o = 0.01 ~ 1.02 wt%)。矿石主要由石英、钠长石、角闪洞、钠~钠钙辉石和褐灰岩组成。角闪孔以棱柱状晶体形式存在，长度可达400 μ m，由浅绿色的芯和橙红色的边缘组成。以(OH, F, Cl) =(2−2Ti)原子为单位，以24(O, OH, F, Cl)为基础，得到了核心和边缘平均组成的化学式;是0.448 (Na 0.468 K)Σ0.916 B (Na 1.586 Ca 0.393 Mn 2 + 0.021)Σ2.000摄氏度(3.896 Mn 2 + 0.124毫克铁3 + 0.657 0.182 Ti李0.031 0.106铜0.004)Σ5.000吨(参见Si 7.936 0.064)Σ8.000 O 22 w (F(哦)1.771 0.062 0.167 O)Σ2.000和0.428 (0.576 K Na)Σ1.004 B (Na 1.759 0.241 Ca)Σ2.000摄氏度(3.143 Mn 2 + 0.332毫克铁3 + 0.782 0.247 Mn 3 + 0.081 Ti李铜)如果[0.106 (OH) O]Σ2.000,分别。因此，角闪孔的核心是镁镁镁岩和钾镁镁钠岩的中间成分，而角闪孔的边缘是钾镁镁钠岩。
{"title":"Discovery of Li–bearing sodium amphibole from the Sanbagawa belt, Japan","authors":"Y. Banno, Chihiro Fukuda, N. Shimobayashi, S. Yamada","doi":"10.2465/jmps.200728","DOIUrl":"https://doi.org/10.2465/jmps.200728","url":null,"abstract":"Lithium – bearing sodium amphibole (Li 2 O = 0.01 – 1.02 wt%) was found in a specimen of schistose manganese ore from the Iimori region in the Sanbagawa metamorphic belt, central Japan. The ore is composed mainly of quartz, albite, amphibole, Na to Na – Ca pyroxene, and braunite. The amphibole occurs as prismatic crystals with lengths of up to 400 µm and consists of a pale – green core and an orange – red rim observed in hand specimen. The chemical formulae of averaged compositions of the core and rim, based on 24(O, OH, F, Cl) with (OH, F, Cl) = (2 − 2Ti) atoms per formula unit, are A (Na 0.468 K 0.448 ) Σ 0.916B (Na 1.586 Ca 0.393 Mn 2+0.021 ) Σ 2.000C (Mg 3.896 Mn 2+0.124 Fe 3+0.657 Al 0.182 Ti 0.031 Li 0.106 Cu 0.004 ) Σ 5.000T (Si 7.936 Al 0.064 ) Σ 8.000 O 22W [(OH) 1.771 F 0.167 O 0.062 ] Σ 2.000 and A (K 0.576 Na 0.428 ) Σ 1.004 B (Na 1.759 Ca 0.241 ) Σ 2.000C (Mg 3.143 Mn 2+0.332 Fe 3+0.782 Al 0.247 Mn 3+0.081 Ti Li Cu ) Si [(OH) O 0.106 ] Σ 2.000 , respectively. Consequently, the core amphibole has an intermediate composition between magnesio – arfvedsonite and potassic – magnesio – arfvedsonite, whereas the rim amphibole is potassic – magnesio – arfvedsonite.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"11 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Takahiro Watanabe, Chikako Ishii, C. Ishizaka, M. Niwa, K. Shimada, Y. Sawai, N. Tsuchiya, Tetsuya Matsunaka, S. Ochiai, F. Nara
*Tono Geoscience Center, Japan Atomic Energy Agency, Toki 509–5102, Japan **Present address: Kyuden Sangyo Co. Inc., 2–18–20 Najima, Higashi–ku, Fukuoka 813–0043, Japan ***Pesco Co. Ltd., 3–25 Minami–machi, Tokiguchi, Toki 509–5123, Japan †Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305–8567, Japan ‡Graduate School of Environmental Studies, Tohoku University, Sendai 980–8579, Japan §Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa 920–1192, Japan #Graduate School of Environmental Studies, Nagoya University, Nagoya 464–8602, Japan
{"title":"Quantitative and semi–quantitative analyses using a portable energy dispersive X–ray fluorescence spectrometer: Geochemical applications in fault rocks, lake sediments, and event deposits","authors":"Takahiro Watanabe, Chikako Ishii, C. Ishizaka, M. Niwa, K. Shimada, Y. Sawai, N. Tsuchiya, Tetsuya Matsunaka, S. Ochiai, F. Nara","doi":"10.2465/jmps.201224","DOIUrl":"https://doi.org/10.2465/jmps.201224","url":null,"abstract":"*Tono Geoscience Center, Japan Atomic Energy Agency, Toki 509–5102, Japan **Present address: Kyuden Sangyo Co. Inc., 2–18–20 Najima, Higashi–ku, Fukuoka 813–0043, Japan ***Pesco Co. Ltd., 3–25 Minami–machi, Tokiguchi, Toki 509–5123, Japan †Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305–8567, Japan ‡Graduate School of Environmental Studies, Tohoku University, Sendai 980–8579, Japan §Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa 920–1192, Japan #Graduate School of Environmental Studies, Nagoya University, Nagoya 464–8602, Japan","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"265 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68830929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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