P. Król, M. Kusiak, D. Dunkley, M. Whitehouse, S. Wilde, L. Augland
{"title":"The record of geological processes in zircon from polymetamorphosed orthogneisses from the Napier Mountains, Napier Complex, East Antarctica","authors":"P. Król, M. Kusiak, D. Dunkley, M. Whitehouse, S. Wilde, L. Augland","doi":"10.2465/jmps.230419","DOIUrl":"https://doi.org/10.2465/jmps.230419","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68833494","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":"Hydrocarbon fluid inclusions in authigenic quartz from the Torinosu Limestone at Sakawa town, Kochi Prefecture, Japan","authors":"Taro Kido, M. Kurosawa, K. Ikehata","doi":"10.2465/jmps.220910","DOIUrl":"https://doi.org/10.2465/jmps.220910","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832486","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}
Organic carbon and carbonate carbon are two important reservoirs that control the carbon geodynamic cycle at convergent margins during plate subduction, arc magmatism and continent building processes. The movement of carbon through different reservoirs in the Earth relating to the global tectonic activities is key in understanding the carbon geodynamic cycle. In this contribution, a comprehensive synthesis on the different types of occurrences of graphite, the purest form of carbon in continental crust, in the Lützow-Holm Complex (LHC), East Antarctica is carried out and carbon isotopic composition is used as a proxy to identify the movement of carbon during orogenesis. Graphite is an important reservoir of carbon in continental crust and occurs in a variety of rock types in the LHC. Based on the mode of occurrence they were classified into several types, disseminated flakes in gneissic rocks, coarse aggregates in leucosomes, graphite concentration in lithological contacts and as monomineralic graphite veins. Disseminated graphite in pelitic gneisses record the lowest carbon isotopic composition (δ13CVPDB values between –25‰ to –15‰), suggesting biogenic signatures, however those in metacarbonate rocks have equilibrated with carbonate carbon during high temperature metamorphism to show heavier values (δ13CVPDB values between –3‰ to –1‰). The carbon isotopic composition of disseminated graphite is modified during prograde metamorphism by devolatilization and also exchange of carbon isotopes with carbonate minerals. Coarse-grained graphite is observed in leucosomes in the migmatized metapelitic rocks. During the high-temperature metamorphism and partial melting of graphite-bearing rocks, graphite decomposes to form COH fluids, part of which, especially the lighter isotope-bearing fluids have escaped the system causing a shift toward heavier values (δ13CVPDB values in the range between –18‰ to –10‰). Based on the field, textural and carbon isotope evidence a model is suggested, where biotite dehydration melting of graphite-bearing rocks caused the dissolution of pre-existing graphite formed from organic materials, and graphite was reprecipitated as coarse aggregates in leucosomes during melt crystallization and cooling. This resulted in the carbon remobilization and isotopic reorganization. Carbon isotopic composition of graphite concentrations in lithological contacts (δ13CVPDB values ranging between –1.8 to –5.7‰) and monomineralic veins (δ13CVPDB values between –3.5 and –6.0‰) suggest that they were precipitated from CO2 fluids locally released through decarbonation reactions. The presence of large volume of skarn mineralization in the contact between carbonate and silicate rocks and similarities of carbon isotopic composition of graphite in contact zones and veins support a local source for CO2 fluids rather than a mantle derived carbon-bearing fluid for vein type graphite. Thus, carbon is recycled and retained as graphite in the continental cru
{"title":"Carbon isotopic composition of graphite in metamorphic rocks from Lützow-Holm Complex, East Antarctica: Implications for carbon geodynamic cycle in continental crust","authors":"M. Satish-Kumar","doi":"10.2465/jmps.230401","DOIUrl":"https://doi.org/10.2465/jmps.230401","url":null,"abstract":"Organic carbon and carbonate carbon are two important reservoirs that control the carbon geodynamic cycle at convergent margins during plate subduction, arc magmatism and continent building processes. The movement of carbon through different reservoirs in the Earth relating to the global tectonic activities is key in understanding the carbon geodynamic cycle. In this contribution, a comprehensive synthesis on the different types of occurrences of graphite, the purest form of carbon in continental crust, in the Lützow-Holm Complex (LHC), East Antarctica is carried out and carbon isotopic composition is used as a proxy to identify the movement of carbon during orogenesis. Graphite is an important reservoir of carbon in continental crust and occurs in a variety of rock types in the LHC. Based on the mode of occurrence they were classified into several types, disseminated flakes in gneissic rocks, coarse aggregates in leucosomes, graphite concentration in lithological contacts and as monomineralic graphite veins. Disseminated graphite in pelitic gneisses record the lowest carbon isotopic composition (δ13CVPDB values between –25‰ to –15‰), suggesting biogenic signatures, however those in metacarbonate rocks have equilibrated with carbonate carbon during high temperature metamorphism to show heavier values (δ13CVPDB values between –3‰ to –1‰). The carbon isotopic composition of disseminated graphite is modified during prograde metamorphism by devolatilization and also exchange of carbon isotopes with carbonate minerals. Coarse-grained graphite is observed in leucosomes in the migmatized metapelitic rocks. During the high-temperature metamorphism and partial melting of graphite-bearing rocks, graphite decomposes to form COH fluids, part of which, especially the lighter isotope-bearing fluids have escaped the system causing a shift toward heavier values (δ13CVPDB values in the range between –18‰ to –10‰). Based on the field, textural and carbon isotope evidence a model is suggested, where biotite dehydration melting of graphite-bearing rocks caused the dissolution of pre-existing graphite formed from organic materials, and graphite was reprecipitated as coarse aggregates in leucosomes during melt crystallization and cooling. This resulted in the carbon remobilization and isotopic reorganization. Carbon isotopic composition of graphite concentrations in lithological contacts (δ13CVPDB values ranging between –1.8 to –5.7‰) and monomineralic veins (δ13CVPDB values between –3.5 and –6.0‰) suggest that they were precipitated from CO2 fluids locally released through decarbonation reactions. The presence of large volume of skarn mineralization in the contact between carbonate and silicate rocks and similarities of carbon isotopic composition of graphite in contact zones and veins support a local source for CO2 fluids rather than a mantle derived carbon-bearing fluid for vein type graphite. Thus, carbon is recycled and retained as graphite in the continental cru","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"661 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135318382","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}
N. Hirakawa, Y. Kebukawa, T. Shibuya, Hisahiro Ueda, Kensei Kobayashi
{"title":"Experimental synthesis of Fe-bearing olivine at near-solidus temperatures and its decomposition during longtime heating","authors":"N. Hirakawa, Y. Kebukawa, T. Shibuya, Hisahiro Ueda, Kensei Kobayashi","doi":"10.2465/jmps.220913","DOIUrl":"https://doi.org/10.2465/jmps.220913","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"33 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832496","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":"New approach to obtain the correct chemical compositions by absorption correction using analytical transmission electron microscopy","authors":"K. Fujino, N. Tomioka, H. Ohfuji","doi":"10.2465/jmps.221017","DOIUrl":"https://doi.org/10.2465/jmps.221017","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832539","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. Hiroi, T. Hokada, T. Adachi, K. Shiraishi, Y. Motoyoshi, E. Grew
{"title":"Nanogranitoid inclusions with grandidierite in mafic granulite from Austhovde, Lützow-Holm Complex, East Antarctica","authors":"Y. Hiroi, T. Hokada, T. Adachi, K. Shiraishi, Y. Motoyoshi, E. Grew","doi":"10.2465/jmps.221209","DOIUrl":"https://doi.org/10.2465/jmps.221209","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68833297","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":"Magma fractionation and emplacement mechanism in a subvolcanic plumbing system in a continental region: constraints from the late Neoproterozoic Wadi Dib ring complex in the Eastern Desert, Egypt.","authors":"E. Saad, K. Ozawa, T. Kuritani, A. Khudeir","doi":"10.2465/jmps.220801","DOIUrl":"https://doi.org/10.2465/jmps.220801","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"28 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68832441","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}
T. Adachi, Tetsuo Kawakami, Fumiko Higashino, M. Uno
{"title":"Metamorphic rocks with different pressure–temperature–time paths bounded by a ductile shear zone at Oyayubi ridge, Brattnipene, Sør Rondane Mountains, East Antarctica","authors":"T. Adachi, Tetsuo Kawakami, Fumiko Higashino, M. Uno","doi":"10.2465/jmps.230220","DOIUrl":"https://doi.org/10.2465/jmps.230220","url":null,"abstract":"","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68833399","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}
Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc, that were formed during back-arc spreading in the Japan Sea, were examined to reveal their petrogenesis and temporal change of arc volcanism during the Japan Sea opening. The arc volcanism in the Toyama basin initiated with rhyolitic pyroclastic flows (Tori Formation) containing hecatolite (moonstone) in 23-22 Ma. Enriched Sr-Nd isotope (SrI = 0.70769-0.70944; NdI = 0.51203-0.51224) suggests that contemporaneous andesitic magma (Kamiwazumi and Matsunagi Formations) mixed or assimilated basement granitoids and gneisses of the Hida belt to generate rhyolitic magma. Subsequently, andesitic volcanism (Iwaine Formation) occurred in 18-17 Ma after magmatic hiatus. Andesitic lavas of the Iwaine Formation are composed of high magnesian andesite (HMA), high-Sr andesite and tholeiitic andesite. HMA has Mg#>64, high Cr and Ni concentrations, not so high Th/Yb and (La/Sm)N ratios, and slightly enriched Sr-Nd isotope (SrI = 0.70482; NdI = 0.51279). High-Sr andesite has relatively low SiO2 content (<60 wt.%), high Sr (>2000 ppm) and K2O contents (3.98 wt.% in the maximum), indicating that it is low-SiO2 adakite. These geochemical characteristics suggest that HMA and high-Sr andesite were produced by partial melting of the mantle wedge saturated by H2O derived from slab fluid and metasomatized by slab melt, respectively. Although chemical variation diagrams suggest tholeiitic andesite seems to have been generated from basaltic magma, it has enriched Sr-Nd isotope (SrI = 0.70713-0.70756; NdI = 0.51237-0.51241). Thus, tholeiitic andesite is considered to have been produced by AFC (assimilation and fractional crystallization) after generation of basaltic parental magma. Andesitic magmatism of the Iwaine Formation was followed by rhyolitic magmatism of the Iozen Formation in 17-16 Ma. The petrogenesis of the rhyolite from the Iozen Formation can be explained by low-rate mixing between andesitic magma (Iwaine Formation) and the Hida belt. The petrogeneses of the andesites, especially HMA and high-Sr andesite, are related to slab melting. Because the old and cold Pacific plate was subducting beneath the Toyama basin during the Japan Sea opening, additional heat source such as upwelling of the asthenospheric mantle into the mantle wedge is required. Moreover, back-arc spreading in the Japan Sea was driven by upwelling of the asthenospheric mantle into the mantle wedge.
{"title":"Petrogenesis of Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc: Temporal change of arc volcanism during the back-arc spreading in the Japan Sea","authors":"Raiki Yamada, Toshiro Takahashi, Yasuhiro Ogita","doi":"10.2465/jmps.221219a","DOIUrl":"https://doi.org/10.2465/jmps.221219a","url":null,"abstract":"Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc, that were formed during back-arc spreading in the Japan Sea, were examined to reveal their petrogenesis and temporal change of arc volcanism during the Japan Sea opening. The arc volcanism in the Toyama basin initiated with rhyolitic pyroclastic flows (Tori Formation) containing hecatolite (moonstone) in 23-22 Ma. Enriched Sr-Nd isotope (SrI = 0.70769-0.70944; NdI = 0.51203-0.51224) suggests that contemporaneous andesitic magma (Kamiwazumi and Matsunagi Formations) mixed or assimilated basement granitoids and gneisses of the Hida belt to generate rhyolitic magma. Subsequently, andesitic volcanism (Iwaine Formation) occurred in 18-17 Ma after magmatic hiatus. Andesitic lavas of the Iwaine Formation are composed of high magnesian andesite (HMA), high-Sr andesite and tholeiitic andesite. HMA has Mg#>64, high Cr and Ni concentrations, not so high Th/Yb and (La/Sm)N ratios, and slightly enriched Sr-Nd isotope (SrI = 0.70482; NdI = 0.51279). High-Sr andesite has relatively low SiO2 content (<60 wt.%), high Sr (>2000 ppm) and K2O contents (3.98 wt.% in the maximum), indicating that it is low-SiO2 adakite. These geochemical characteristics suggest that HMA and high-Sr andesite were produced by partial melting of the mantle wedge saturated by H2O derived from slab fluid and metasomatized by slab melt, respectively. Although chemical variation diagrams suggest tholeiitic andesite seems to have been generated from basaltic magma, it has enriched Sr-Nd isotope (SrI = 0.70713-0.70756; NdI = 0.51237-0.51241). Thus, tholeiitic andesite is considered to have been produced by AFC (assimilation and fractional crystallization) after generation of basaltic parental magma. Andesitic magmatism of the Iwaine Formation was followed by rhyolitic magmatism of the Iozen Formation in 17-16 Ma. The petrogenesis of the rhyolite from the Iozen Formation can be explained by low-rate mixing between andesitic magma (Iwaine Formation) and the Hida belt. The petrogeneses of the andesites, especially HMA and high-Sr andesite, are related to slab melting. Because the old and cold Pacific plate was subducting beneath the Toyama basin during the Japan Sea opening, additional heat source such as upwelling of the asthenospheric mantle into the mantle wedge is required. Moreover, back-arc spreading in the Japan Sea was driven by upwelling of the asthenospheric mantle into the mantle wedge.","PeriodicalId":51093,"journal":{"name":"Journal of Mineralogical and Petrological Sciences","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135159069","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：