Oxygen and Carbon Isotope Composition of Vitim Nephrite Province Rocks

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Petrology Pub Date : 2025-10-02 DOI:10.1134/S0869591125700134

E. V. Kislov, V. F. Posokhov, I. S. Goncharuk

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Abstract

The oxygen isotopic composition of dolomite-type nephrite, metasomatic and host rocks of the Kavokta, Voimakan and Nizhnii Ollomi deposits of the Vitim Province was studied. The nephrite is characterized by an extremely light oxygen isotope composition δ¹⁸O –21.5 ÷ –15.8‰. The metasomatic rocks showed wider variations, including also extremely light isotope ratios –21.5 ÷ +9.2‰. The host rocks of the deposit are characterized by the heavier oxygen isotope compositions: granite and granodiorite –7.51 ÷ –0.71‰, amphibolite –8.38 ÷ +9.60‰, dolomitic marble +20.8 ÷ +26.1‰. The extremely light isotopic composition of nephrite is explained by the meteoric origin of the fluid from meltwater and the removal of isotopically heavy oxygen by carbon dioxide through decarbonatization of dolomitic marble. The granite mainly provided the regional heating that activated the fluid. The analyzed dolomite is characterized by a heavier carbon isotopic composition +3.2 ÷ +5.2‰ δ¹³C explained by the fermentation of organic matter and methane formation in the basin in which the dolomite was formed. Calcite from calcite–tremolite skarn is characterized by the lighter carbon isotopic composition –6.4 ÷ +0.7‰ δ¹³C as a result of metasomatic process.

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受害软玉省岩石的氧、碳同位素组成

研究了塔里木盆地下乌洛米省Kavokta、Voimakan和Nizhnii Ollomi矿床白云岩型软玉、交代岩和寄主岩的氧同位素组成。该软玉的氧同位素组成δ18O -21.5 ÷ -15.8‰，极轻。交代岩变化较大，同位素比值-21.5‰~ +9.2‰也非常轻。矿床主岩氧同位素组成较重：花岗岩和花岗闪长岩-7.51 ÷ -0.71‰，角闪岩-8.38 ÷ +9.60‰，白云岩+20.8 ÷ +26.1‰。软玉的极轻同位素组成可以用来自融水的流体的大气起源和白云岩大理岩脱碳过程中二氧化碳对同位素重氧的去除来解释。花岗岩主要提供了激活流体的区域加热。白云岩碳同位素组成+3.2‰~ +5.2‰δ13C较重，这与白云岩形成盆地有机质发酵和甲烷形成有关。方解石-透闪石矽卡岩中的方解石，由于交代作用，其碳同位素组成-6.4 ÷ +0.7‰δ13C较轻。

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来源期刊

Petrology 地学-地球科学综合

CiteScore

2.40

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology 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.