法国Arignac石膏矿的富钙驱动石:对富硫酸盐、高镁变质蒸发岩中电气石发育的启示

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
B. Dutrow, D. Henry
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引用次数: 2

摘要

电气石存在于广泛的成分环境中,但其在变蒸发岩中的存在较少被研究。高度镁质(X Mg=0.90–0.98)的变晶电气石产于法国Arignac石膏矿富含硫酸盐、硬石膏-石膏的变蒸发岩中,并保存了这种不寻常地球化学环境的岩石学记录。该样品最初是三叠纪蒸发岩矿床,被解释为经历了高温-低压(HT–LP)变质作用,随后经历了低品位、高度变形的叠加。变晶电气石保留了HT–LP矿物组合的残余,包括硬石膏、金云母、白云石、透闪石、富含Cl的石斑石(71–85%的方钠石成分)、金红石、锆石和氟磷灰石。低级变形叠加层的特征是石膏部分取代硬石膏,斜绿石部分取代金云母,滑石部分取代白云石,近端成员钠长石和钾长石以及后来横切的方解石和天青石的混合物部分取代方星石。电气石形成两个结构区——1区几乎没有矿物包裹体,2区包裹体丰富和/或化学分区复杂。电气石
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calcium-rich dravite from the Arignac Gypsum Mine, France: Implications for tourmaline development in a sulfate-rich, highly magnesian meta-evaporite
Tourmaline occurs in a wide range of compositional environments, but its occurrence in meta-evaporites is less commonly investigated. Highly magnesian ( X Mg = 0.90–0.98), poikiloblastic tourmaline occurs in a sulfate-rich, anhydrite– gypsum-bearing meta-evaporite in the Arignac Gypsum Mine, France and preserves a petrologic record of this unusual geochemical environment. Originally a Triassic evaporite deposit, the sample is interpreted to have undergone high-temperature–low-pressure (HT–LP) metamorphism and subsequently experienced low-grade, highly deformed overprints. Poikiloblastic tourmaline preserves relicts of the HT–LP mineral assemblage, as inclusions of anhydrite, phlogopite, dolomite, tremolite, Cl-rich scapolite (71–85 % marialite component), rutile, zircon, and fluor-apatite. The low-grade deformational overprints are characterized by partial replacement of anhydrite by gypsum, phlogopite by clinochlore, dolomite by talc, and scapolite by mixtures of near end-member albite and K-feldspar with later crosscutting calcite and celestite. Tourmaline develops two textural zones – zone 1 with few mineral inclusions and zone 2 with abundant inclusions and/or complex chemical zoning. The tourmaline
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来源期刊
Journal of Geosciences
Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY
CiteScore
2.30
自引率
7.10%
发文量
15
审稿时长
>12 weeks
期刊介绍: The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.
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