来自雅库特 Udachnaya 金伯利岩管的 Iowaite：晶体化学与结晶后转化

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Doklady Earth Sciences Pub Date : 2024-05-13 DOI:10.1134/s1028334x24601858

E. S. Zhitova, D. S. Mikhailenko, I. V. Pekov, A. V. Korsakov, A. A. Zolotarev

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引用次数: 0

摘要

摘要在雅库特 Udachnaya 金伯利岩管的晚期热液矿物集合体中，发现了一种二价阳离子（Mg + Fe2+）/Fe3+含量极低的非典型 iowaite。我们使用单晶体对其晶体结构进行了研究：多晶型 3R，空间群 \(R\bar {3}m\)，a = 3.1213(3) Å，с = 23.621(4) Å，V = 199.30(5) Å3; R1 = 0.027。一些晶体的分带特征表明存在自然离子交换，其主要方案是 2Cl- → SO\(_{4}^{2 - }}\) 和 2Cl- → 2SO\(_{4}^{2 - }}\) + Ca2+。这是水铝石超群矿物中第一个可靠的天然阴离子交换案例。阴离子交换反应是随着层间距离从 8.0 Å 增加到 11.2 Å 而发生的。该矿物的成分及其分带特征提供了热液后期演化过程的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Iowaite from the Udachnaya Kimberlite Pipe, Yakutia: Crystal Chemistry and Postcrystallization Transformations

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Iowaite from the Udachnaya Kimberlite Pipe, Yakutia: Crystal Chemistry and Postcrystallization Transformations

Abstract

An atypical variety of iowaite with an extremely low content of divalent cations (Mg + Fe²⁺)/Fe³⁺ of ~2.75 : 1 is identified in a late hydrothermal mineral assemblage of the Udachnaya kimberlite pipe, Yakutia. Its crystal structure is studied using a single crystal: polytype 3R, space group \(R\bar {3}m\), a = 3.1213(3) Å, с = 23.621(4) Å, V = 199.30(5) Å³; R₁ = 0.027. Some crystals are characterized by zonation indicating a natural ion exchange, the leading schemes of which are 2Cl^– → SO\(_{4}^{{2 - }}\) and 2Cl^– → 2SO\(_{4}^{{2 - }}\) + Ca²⁺. This is the first reliable case of natural anion exchange in minerals of the hydrotalcite supergroup. The anion exchange reaction occurs with an increase of interlayer distance from 8.0 to 11.2 Å. The composition of the mineral and the character of its zonation bear information on the evolution of late hydrothermal processes.

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.