大西洋中脊蛇纹岩的碳酸化作用:1。深海橄榄岩发掘过程中化学和同位素(δ18O, δ13С, Rb, Sr, Sm, Nd)组成的演化

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
E. A. Krasnova, S. A. Silantyev, V. V. Shabykova, A. S. Gryaznova
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引用次数: 0

摘要

海洋地壳中的碳酸盐矿物是由CO2与超镁铁质和基性岩中的硅酸盐矿物相互作用形成的。碳酸化作用导致大量碳酸盐脉体的生成,填满岩石基质的空隙,产生部分和/或完全碳酸化的岩石,这些岩石构成缓慢扩张的中洋脊的原岩,并存在于蛇绿岩杂岩中。Silantyev等人(2023)提出了中大西洋脊不同段碳酸蛇纹岩形成主要阶段的概念模型。在本研究中,我们研究了来自缓慢扩张的洋中脊洋核杂岩的碳酸超基性岩石的同位素变化(δ18O, δ13С, Rb, Sr, Sm, Nd)。本研究得到的碳、氧同位素组成与前人的研究结果吻合较好,可以量化洋壳层序中大西洋中脊不同段海流体与蛇纹岩相互作用的持续时间和空间位置。以往根据矿物岩相特征划分出的橄榄岩群与得到的参数关系或Sr-Nd同位素系统学计算出的水岩比具有较好的一致性,反映了洋壳超镁铁质原岩的碳酸化阶段顺序及其在海底的停留时间。我们的研究结果表明,含有所研究岩石的海洋岩心复合体是在不同时期被挖掘到海底表面的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Carbonation of Serpentinites of the Mid-Atlantic Ridge: 2. Evolution of Chemical and Isotopic (δ18O, δ13С, Rb, Sr, Sm, Nd) Compositions during Exhumation of Abyssal Peridotites

Carbonation of Serpentinites of the Mid-Atlantic Ridge: 2. Evolution of Chemical and Isotopic (δ18O, δ13С, Rb, Sr, Sm, Nd) Compositions during Exhumation of Abyssal Peridotites

Carbonate minerals in oceanic crust are formed through CO2 interaction with silicate minerals of ultramafic and mafic rocks. Carbonation leads to the generation of numerous carbonate veins, filling interstices in the rock matrix and producing partially and/or completely carbonated rocks that compose the protolith of slow-spreading mid-ocean ridges and are present in ophiolite complexes. Silantyev et al. (2023) proposed a conceptual model of the main stages in the formation of carbonated serpentinites in different segments of the Mid-Atlantic Ridge. In this study, we examined isotope variations (δ18O, δ13С, Rb, Sr, Sm, Nd) in the previously studied carbonated ultramafic rocks from oceanic core complexes of the slow-spreading mid-oceanic ridge. The carbon and oxygen isotope compositions obtained in our study are well consistent with results of our previous studies and make it possible to quantify the duration and spatial position of sea fluid interaction with serpentinites of different segments of the Mid-Atlatnic Ridge in the oceanic crust sequence. Peridotite groups previously distinguished based on the mineral and petrographic features are well consistent with relations of obtained parameters or with water/rock ratio calculated using Sr-Nd isotope systematics, and reflect the sequence of carbonation stages in the ultramafic protolith of oceanic crust and duration of its residence on the seafloor. Our results indicate that the oceanic core complexes containing the studied rocks were exhumed to the seafloor surface during different time periods.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
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.
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