American Mineralogist最新文献_第7页

Different structural behavior of MgSiO3 and CaSiO3 glasses at high pressures MgSiO3和CaSiO3玻璃在高压下的不同结构行为

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-9060

N. Kondo, Y. Kono, I. Ohira, R. Hrubiak, K. Ohara, K. Nitta, O. Sekizawa

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Pyrite stability and chalcophile element mobility in a hot Eocene forearc of the Pacific Rim Terrane, Vancouver Island, Canada 加拿大温哥华岛环太平洋地块始新世热前弧中黄铁矿稳定性和亲铜元素迁移

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-8973

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Effect of chlorine substitution on the thermal stability of ferro-pargasite and thermochemical properties of ferro-chloro-hornblende 氯取代对寄生铁热稳定性及氯铁角闪石热化学性质的影响

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-8981

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High-Pressure Phase Transition of Fe-bearing Orthopyroxene Revealed by Raman Spectroscopy 拉曼光谱研究含铁正硝石的高压相变

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-8998

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The 34S/32S homogeneity of Chemical Vapor Transport (CVT) Reaction-synthesized pyrites 化学气相输运反应合成黄铁矿的34S/32S均匀性

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-9029

引用次数: 0

Electrical Properties of Iron Sulfide-bearing Dunite under Pressure: Effect of Temperature, Composition, and Annealing Time 含硫化铁的刚石在压力下的电性能:温度、成分和退火时间的影响

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-9054

{"title":"Electrical Properties of Iron Sulfide-bearing Dunite under Pressure: Effect of Temperature, Composition, and Annealing Time","authors":"","doi":"10.2138/am-2023-9054","DOIUrl":"https://doi.org/10.2138/am-2023-9054","url":null,"abstract":"Abstract The detection and quantification of metal sulfides in host rocks by electrical measurements have been priorities for field and laboratory studies, motivated by mineral prospecting and fundamental interest in the mantle structure or core/mantle differentiation, among other reasons. Here, we reanalyze electrical data for a dunite host with added FeS or Fe-S-Ni (Saxena et al. 2021), and report additional experimental runs along with electron microprobe analyses. The applied pressure was 2 GPa; impedance spectra were acquired while annealing at 1023 K (below the metal-sulfide solidus), and while varying temperature from 570 to 1650 K. Addition of 6.5 or 18 vol% FeS strongly enhances conductivity of the bulk sample compared with that of the dunite host, though values are 100–100 000 times less than those of pure FeS. These results indicate that most metal sulfide content is not part of a viable conductive path, even for the 18 vol% quantity. Nevertheless, the relatively high conductivity and weak temperature dependence of the 18 vol% sample reveal that contiguous paths of solid or molten FeS span the electrodes. The sample with 6.5 vol% sulfide also exceeds the percolation threshold for temperatures as low as ~100 K below the eutectic melting point, likely because FeS softens. Conductivity is nearly unchanged upon crossing the eutectic temperature, however a decline over 1400–1500 K reveals that the 6.5 vol% molten FeS forms a fragile electrical network in dunite. Samples with Fe50S40Ni10 or Fe40S40Ni20 (at%) are less conductive than pure dunite at temperatures below ~1450 K. This surprising result, likely caused by a reducing influence of Fe or Ni metal, does not support the use of FeS as an analog for compositions with nickel or excess metal. Our findings suggest that probing the electrical network of metal sulfides as solids complements other studies focused on connectivity of molten metal sulfides.","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41452653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Fe(II), Fe(III) and Al(III) Isomorphic Substitutions on Acid-Base Properties of Edge Surfaces of Cis-Vacant Montmorillonite: Insights from First-Principles Molecular Dynamics Simulations and Surface Complexation Modeling Fe(II)、Fe(III)和Al(III)同构取代对顺式空蒙脱土边缘表面酸碱性质的影响:来自第一性原理分子动力学模拟和表面络合建模的见解

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-9057

引用次数: 0

Znucalite, the only known zinc uranyl carbonate: its crystal structure and environmental implications 锌钙石，唯一已知的碳酸铀酰锌：其晶体结构和环境影响

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-8956

引用次数: 0

Magnesio-ferri-hornblende, ☐Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2, a new member of the amphibole supergroup 镁铁角闪石，☐角闪石超群的新成员Ca2（Mg4Fe3+）[（Si7Al）O22]（OH）2

IF 3.1 3区地球科学

American Mineralogist Pub Date : 2023-09-01 DOI: 10.2138/am-2023-8922