Sulfur Isotopic Composition of Sulfides and Sulfates from Rocks of Carbonatite Complexes of the Devonian Kola Alkaline Province

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Geochemistry International Pub Date : 2024-07-11 DOI:10.1134/s0016702924700253

E. N. Kozlov, E. N. Fomina, V. N. Reutsky, M. Yu. Sidorov

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Abstract

This study presents the sulfur isotopic characteristics in baryte from carbonatites of the Sallanlatva massif and sulfides (mainly pyrite and pyrrhotite) from carbonatites, phoscorites and products of their contact interaction with the host silicate rocks of most carbonatite-bearing complexes of the Devonian Kola Alkaline Province (KAP). For some complexes (Ozernaya Varaka, Kontozero), these characteristics are reported for the first time. The determined range of δ³⁴S variations of sulfides in one complex does not exceed 4‰, but reaches 20‰ for the entire Kola Alkaline Province. This may be related to the evolution style of carbonatites and associated rocks. It is shown that the δ³⁴S value in sulfides decreases from (1) the least evolved volcanic carbonatites of the Kontozero complex (δ³⁴S_avg. = –1.3‰) through (2) carbonatites and phoscorites of the Kovdor, Ozernaya Varaka, Sokli, and Salmagora massifs towards (3) the rocks of Seblyavr, Vuoriyarvi, and, finally, the carbonatites of Sallanlatva (δ³⁴S_avg. = –14.7‰) massifs, where sulfides differ from those of other KAP carbonatites in their exceptionally low δ³⁴S values. The carbonatite volcanics of Kontozero are almost barren of REE mineralization; carbonatites of the second group contain accessory amounts of REE minerals; the third group is peculiar in the abundance of late carbonatites, where REE carbonates are frequently major minerals. Thus, the greater the volume of REE minerals in carbonatites of the complex, the lower the δ³⁴S value in sulfides from its carbonatites and associated rocks. For the first time in the KAP, the sulfur isotopic composition of associated baryte–pyrite pairs was studied in the Sallanlatva carbonatites. The sulfur isotopic characteristics are shown to correspond to the final low-temperature (250–350°C) stage of carbonatite evolution in oxidized conditions, which satisfies the parameters of baryte crystallization. Since the studied samples of the Sallanlatva carbonatites are explosive breccias, the oxidized composition of fluids may indicate their phreatomagmatic nature, i.e., formation due to the interaction of intruded hot matter (melt/fluid) with meteoric waters.

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泥盆纪科拉碱性省碳酸盐岩群岩石中硫化物和硫酸盐的硫同位素组成

摘要本研究介绍了萨兰拉特瓦地块碳酸盐岩中重晶石的硫同位素特征，以及泥盆纪科拉碱性省（KAP）大多数含碳酸盐岩复合体的碳酸盐岩、辉绿岩及其与主硅酸盐岩接触作用产物中的硫化物（主要是黄铁矿和黄铁矿）的硫同位素特征。对于某些复合岩（Ozernaya Varaka、Kontozero），这些特征是首次报道。一个复合体中硫化物的δ34S变化的确定范围不超过4‰，但整个科拉碱性省的δ34S变化范围达到20‰。这可能与碳酸盐岩和伴生岩的演化方式有关。研究表明，硫化物中的δ34S 值从 (1) 康托泽罗复合体中演化程度最低的火山碳酸盐岩 (δ34Savg. = -1.3‰）到（2）科夫多尔、奥泽纳亚瓦拉卡、索克利和萨尔马戈拉地块的碳酸盐岩和辉绿岩，再到（3）塞布利亚弗尔、武奥里亚维的岩石，最后是萨兰拉特瓦（δ34Savg. = -14.7‰）地块的碳酸盐岩，这些碳酸盐岩的硫化物与其他 KAP 碳酸盐岩的硫化物不同，δ34S 值特别低。孔托泽罗的碳酸盐火山岩几乎没有稀土元素矿化；第二组碳酸盐岩含有少量稀土元素矿物；第三组碳酸盐岩的稀有性在于晚期碳酸盐岩的丰富性，其中稀土元素碳酸盐经常是主要矿物。因此，复合碳酸盐岩中的 REE 矿物含量越高，其碳酸盐岩和伴生岩中硫化物的 δ34S 值就越低。在 KAP 中首次研究了 Sallanlatva 碳酸盐岩中伴生重晶石-黄铁矿对的硫同位素组成。研究表明，硫同位素特征与碳酸盐岩在氧化条件下演化的最后低温（250-350°C）阶段相吻合，满足重晶石结晶的参数要求。由于所研究的 Sallanlatva 碳酸盐岩样本是爆炸性角砾岩，流体的氧化成分可能表明其具有岩浆性质，即由于侵入的热物质（熔体/流体）与陨石水的相互作用而形成。

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来源期刊

Geochemistry International 地学-地球化学与地球物理

CiteScore

1.60

自引率

12.50%

发文量

审稿时长

1 months

期刊介绍： Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.