Abstract

The trace element distribution (including water and halogens) has been studied for the first time using SIMS techniques, in two different yellow beryl (heliodor) crystals from greisens of the Sherlovaya Gora deposit. The crystals showed different growth zoning. The zoning of bright heliodor (12 point analyses) is reflected in increasing contents of Fe, Ti, Sc, Na, K, Cs, Li, water, and chlorine from core to rim. This zoning is caused by substitution of Fe³⁺ and Sc³⁺ for Al³⁺ or by substitution of Fe²⁺ for Al³⁺ with the charge compensation provided by univalent LILE (Na, Cs, Li, K, Rb), which are incorporated into the structure channels. Together with LILE, water and chlorine are incorporated into channels. The majority of the transparent light heliodor crystal (nine point analyses) is compositionally homogeneous, and the trace element concentration changes only in the crystal rim. Sodium, Li, and Cl contents decreasing toward the crystal margin negatively correlate with the Fe, Ti, Sc, K, Ca, and Cs concentrations. Similar zoning may have been caused by simultaneous precipitation of heliodor and minerals concentrating Na, Li, and Cl, such as albite and lithium mica.

中文翻译：

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俄罗斯外贝加尔湖东南部 Sherlovaya Gora 矿床中绿柱石的微量元素组成

摘要

首次使用 SIMS 技术研究了来自 Sherlovaya Gora 矿床的云英石的两种不同黄色绿柱石 (heliodor) 晶体中的微量元素分布（包括水和卤素）。晶体显示出不同的生长分区。明亮日光的分区（12 点分析）反映在从核心到边缘的 Fe、Ti、Sc、Na、K、Cs、Li、水和氯的含量增加。这种分区是由 Fe ³⁺和 Sc ³⁺替代Al ^{3+或 Fe 2+}替代Al ^3+引起的由单价 LILE（Na、Cs、Li、K、Rb）提供的电荷补偿，它们被并入结构通道中。与 LILE 一起，水和氯被纳入渠道。大多数透明光 heliodor 晶体（九点分析）在成分上是均匀的，微量元素浓度仅在晶体边缘发生变化。钠、锂和氯的含量向晶体边缘下降，与铁、钛、锑、钾、钙和铯的浓度呈负相关。类似的分区可能是由于同时沉淀了 heliodor 和富含 Na、Li 和 Cl 的矿物，例如钠长石和锂云母。