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Ferric iron in chrome-bearing spinels: implications for microprobe correction procedures 含铬尖晶石中的铁:微探针校正程序的意义
3区 地球科学 Q2 MINERALOGY Pub Date : 2023-09-12 DOI: 10.1180/mgm.2023.68
Hugh Rollinson, Jacob Adetunji
Abstract We investigated the compositions of a suite of 361 chrome-bearing spinels from spinel peridotites, ophiolitic mantle chromitites and from layered igneous intrusions in which the Fe 2+ /Fe 3+ ratio has been determined by Mössbauer spectroscopy. We explore the crystal-chemical controls on the distribution of Fe 3+ and on mineral stoichiometry with regard to electron-probe correction procedures for estimating Fe 3+ in spinel. We find that chrome-bearing spinels can be subdivided into three groups: a Cr–Al-rich group; a high-Fe group; and a highly oxidised group. Spinels of the Cr–Al group are found in spinel peridotites and ophiolitic mantle chromitites. They are normal spinels with a low Fe 3+ content and compositions that are close to stoichiometric. Spinels in the high-Fe group are found in layered igneous intrusions. They are also normal spinels which have higher concentrations of Fe 3+ on the octahedrally coordinated site than is found for the Cr–Al group. Stoichiometric calculations tend to overestimate the Fe 3+ content and their compositions do not conform to the MgO–cr# correlation found in the Cr–Al group. Spinels in the highly oxidised group are found in layered intrusions and ophiolitic mantle chromitites. They have (Fe 3+ /ΣFe) Möss > 0.4 and high Cr (cr# > 0.5), but relatively low Fe 2+ (fe# 0.24–0.56). Stoichiometric calculations tend to underestimate the Fe 3+ content. They represent normal spinels in which tetrahedrally coordinated Fe 2+ has been oxidised to Fe 3+ . Our data show that spinels with greater Cr and Fe are sufficiently different in their crystal chemistry from the aluminous spinels to indicate that the EPMA correction procedures developed for Fe 3+ in aluminous spinels on the basis of the Cr/Al ratio, and used in oxy-thermobarometry, are inappropriate for Cr-rich and Fe-rich compositions.
摘要本文研究了尖晶石橄榄岩、蛇绿质地幔铬铁矿和层状火成岩侵入体中361颗含铬尖晶石的组成,并用Mössbauer光谱法测定了其中的fe2 + / fe3 +比值。我们探讨了晶体化学对铁3+分布的控制,以及关于尖晶石中铁3+的电子探针校正程序的矿物化学计量学。我们发现含铬尖晶石可分为三组:富cr - al组;高铁基团;一个高度氧化的基团。Cr-Al类尖晶石见于尖晶石橄榄岩和蛇绿质地幔铬铁矿中。它们是正常尖晶石,fe3 +含量低,组成接近化学计量。高铁组尖晶石见于层状火成岩侵入体中。它们也是正常尖晶石,在八面体配位位点上的fe3 +浓度高于Cr-Al基团。化学计量学计算倾向于高估fe3 +含量,其组成不符合Cr-Al组中MgO-cr #的相关性。高氧化组尖晶石见于层状侵入体和蛇绿质地幔铬铁矿中。它们有(Fe 3+ /ΣFe) Möss >Cr (Cr # >0.5),但Fe 2+相对较低(Fe # 0.24-0.56)。化学计量计算往往低估了铁3+的含量。它们代表正常尖晶石,其中四面体配位的fe2 +被氧化为fe3 +。我们的数据表明,具有较大Cr和Fe的尖晶石在晶体化学上与铝尖晶石有足够的不同,这表明基于Cr/Al比开发的铝尖晶石中Fe 3+的EPMA校正程序,并用于氧热压测量,不适合富Cr和富Fe成分。
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引用次数: 0
The trace element chemistry of amphibole, magnetite, and ilmenite as potential exploration guides to metamorphosed Proterozoic Cu-Zn±Pb±Au±Ag volcanogenic massive sulfide deposits in Colorado 美国科罗拉多州角闪洞、磁铁矿、钛铁矿微量元素化学特征对变质元古代Cu-Zn±Pb±Au±Ag火山块状硫化物矿床具有潜在的找矿指导意义
3区 地球科学 Q2 MINERALOGY Pub Date : 2023-09-11 DOI: 10.1180/mgm.2023.69
Paul G. Spry, Edward H. Berke, Dan Layton-Matthews, Alexandre Voinot, Adriana Heimann, Graham S. Teale, Anette von der Handt
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引用次数: 0
Deynekoite, Ca9 Fe3+(PO4)7 – a new mineral of the merrillite group from phosphide-bearing contact facies of paralava, Hatrurim Complex, Daba-Siwaqa, Jordan Deynekoite, Ca9 Fe3+(PO4)7——约旦Daba-Siwaqa地区Hatrurim杂岩含磷化接触相副滑石组新矿物
3区 地球科学 Q2 MINERALOGY Pub Date : 2023-09-11 DOI: 10.1180/mgm.2023.71
Evgeny V. Galuskin, Marcin Stachowicz, Irina O. Galuskina, Krzysztof Woźniak, Yevgeny Vapnik, Mikhail N. Murashko, Grzegorz Zieliński
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引用次数: 1
Minasgeraisite-(Y) discredited as an ordered intermediate between datolite and hingganite-(Y) minasgeraite -(Y)是一种介于绿沸石和绿沸石-(Y)之间的有序中间体。
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-09-01 DOI: 10.1180/mgm.2023.67
Daniel Atencio
Abstract Minasgeraisite-(Y) is discredited on the basis of it being an ordered intermediate between datolite and hingganite-(Y) (IMA-CNMNC Proposal 23-F). An idealised formula is (Ca2Y2)□2(Be2B2)Si4O16(OH)4, which corresponds to Ca2□B2Si2O8(OH)2 (datolite) + Y2□Be2Si2O8(OH)2 (hingganite-(Y)). The type material is rich in Bi, the Bi-richest portion yet discovered from the type locality is shown to be an intermediate member between datolite, hingganite-(Y) and a hypothetical end-member phase yet to be found of composition Bi2□Be2Si2O8(OH)2. Minasgeraisite-(Y) has a different space group to datolite and hingganite-(Y). This lowering of symmetry to an acentric triclinic system is caused by different element occupancies on the A site of the gadolinite supergroup structure, which for minasgeraisite-(Y) becomes four individual sites. Such an order–disorder of elements is not considered as species-defining criteria despite the change in space group. Therefore, minasgeraisite-(Y) is discredited.
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引用次数: 0
Structure and thermal expansion of end-member olivines I: Crystal and magnetic structure, thermal expansion, and spontaneous magnetostriction of synthetic fayalite, Fe2SiO4, determined by high-resolution neutron powder diffraction 端元橄榄石的结构和热膨胀I:高分辨率中子粉末衍射法测定合成辉绿岩Fe2SiO4的晶体和磁性结构、热膨胀和自发磁致伸缩
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-08-25 DOI: 10.1180/mgm.2023.66
E. Tripoliti, D. Dobson, A. Fortes, A. R. Thomson, P. Schofield, I. Wood
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引用次数: 0
Crystal chemistry of zemannite-type structures: IV. Wortupaite, the first new tellurium oxysalt mineral described from an Australian locality 钙镁石型结构的晶体化学:IV.Wortupaite,澳大利亚第一种新的碲氧盐矿物
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-08-24 DOI: 10.1180/mgm.2023.64
Owen P. Missen, Stuart Mills, J. Brugger, W. Birch, P. Elliott
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引用次数: 0
Mangani-eckermannite, NaNa2(Mg4Mn3+)Si8O22(OH)2, a new amphibole from Tanohata Mine, Iwate Prefecture, Japan 日本岩手县大和田矿的一种新角闪石——Mangani-eckermannite,NaNa2(Mg4Mn3+)Si8O22(OH)2
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-08-10 DOI: 10.1180/mgm.2023.63
A. Kasatkin, N. Zubkova, A. Agakhanov, N. Chukanov, R. Škoda, F. Nestola, D. I. Belakovskiy, I. Pekov
[BODY]
(身体)
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引用次数: 0
Magmatic and post-magmatic evolution of the Newania carbonatite complex, Rajasthan, north-western India 印度西北部拉贾斯坦邦Newania碳酸岩杂岩的岩浆和岩浆后演化
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-08-08 DOI: 10.1180/mgm.2023.61
Amritpaul Singh, R. Mitchell, Gurmeet Kaur, D. Sarma
Abstract This work describes the mineralogy of dolomite carbonatite occurring at the Newania carbonatite complex, Rajasthan, north-western India. The mineralogy records the textural and compositional features of magmatic and post-magmatic stages of carbonatite evolution. Ferroan dolomite is the principal constituent and displays variable degrees of deformation, ranging from brittle-to-ductile deformation regimes. Apatite exhibits textural and compositional evolutionary trends from early-to-late stages of carbonatite evolution. Two varieties of amphibole are reported for the first time from this complex, ferri-winchite and cummingtonite; the former is magmatic and the latter is metamorphic in origin. The columbite–tantalite-series minerals are columbite-(Fe), and their paragenesis evolves from composite grains with pyrochlore to individual crystals. Pyrochlore is magmatic with U–Ta–Ti-rich compositions and shows evolution from calciopyrochlore to kenopyrochlore, followed by alteration during late-stages of carbonatite evolution. Monazite and baryte constitute the post-magmatic mineral assemblage; the former is hydrothermal and crystallised after precursor apatite, whereas the latter is associated exclusively with columbite–pyrochlore composites. On the basis of the mineralogy of the carbonatite, it is concluded that the parent magma was generated by low-degree partial melting of magnesite–phlogopite-bearing peridotite.
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引用次数: 0
Physical properties and crystal structure of near end-member oxy-dravite from the Beluga occurrence, Nunavut territory, Canada 加拿大Nunavut地区Beluga产状近端元氧生辉石的物理性质和晶体结构
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-08-07 DOI: 10.1180/mgm.2023.59
Lenka Skřápková, J. Cempírek, P. Belley, L. Groat, R. Škoda
Abstract Oxy-dravite, ideally Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3(O), was found in a composition near its ideal end-member at the Beluga occurrence, Nunavut territory, Canada. It occurs in retrograde albite–muscovite–corundum–calcite domains in a calc-silicate rock. This uncommon oxy-dravite occurs as dark brown, equant to short-prismatic, idiomorphic crystals with vitreous lustre and up to ca. 4 × 3 cm in size. The oxy-dravite is optically uniaxial (–), with ω = 1.6453(5) and ɛ = 1.6074(18); its calculated density is 3.069 g.cm–3 with a compatibility index of 0.016. The Beluga oxy-dravite has trigonal symmetry, space group R3m with a = 15.9121(2) Å, c = 7.1788(10) Å, V = 1574.12(5) Å3 and Z = 3. The crystal structure was refined to R1 = 1.45 using 1613 unique reflections. The empirical crystal-chemical formula is X(Na0.88Ca0.08□0.03K0.01)Y(Al1.49Mg1.31Fe0.15Ti0.04Zn0.01)Z(Al5.42Mg0.58)T(Si5.84Al0.16O18)B(BO3)3V(OH2.95O0.05)W(O0.84OH0.01F0.15). Oxy-dravite in nature commonly occurs in a solid solution with foitite, schorl and oxy-schorl. At the Beluga occurrence, its minor contents of Al, vacancy [□], and Ca are most likely compensated by (□Al)(NaR2+)–1 and (CaMg)(NaAl)–1 exchanges of the oxy-magnesio-foitite and magnesio-lucchesiite components. The Beluga occurrence of oxy-dravite is characterised by an Mg-rich environment related to a metamorphic overprint of the original sedimentary sequence. This sequence of marine dolomitic argillaceous marl was influenced by (B,Cl)-rich fluids, probably proximally-derived from mineral breakdown reactions in the calc-silicate during the retrograde stage of metamorphism. The locality is a rare example of a tourmaline + corundum assemblage.
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引用次数: 0
Ferriandrosite-(Ce), a new member of the epidote supergroup from Betliar, Slovakia 铁雄石-(Ce),绿绿石超群的新成员,产自斯洛伐克的Betliar
IF 2.7 3区 地球科学 Q2 MINERALOGY Pub Date : 2023-08-07 DOI: 10.1180/mgm.2023.62
M. Števko, Pavol Myšľan, C. Biagioni, D. Mauro, T. Mikuš
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引用次数: 0
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Mineralogical Magazine
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