Carbonation of Serpentinites of the Mid-Atlantic Ridge: 1. Geochemical Trends and Mineral Assemblages

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-03-21 DOI:10.1134/S0869591123010095
S. A. Silantyev, E. A. Krasnova, D. D. Badyukov, A. V. Zhilkina, T. G. Kuzmina, A. S. Gryaznova, V. D. Shcherbakov
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Abstract

Abyssal peridotite outcrops compose vast areas of the ocean floor in the Atlantic, Indian, and Arctic Oceans, where they are an indispensable part of the oceanic crust section formed in the slow-spreading oceanic ridges (Mid-Atlantic Ridge, Southwest Indian Ridge, and Gakkel Ridge). The final stage in the evolution of abyssal peridotites in the oceanic crust is their carbonation, which they experience on the ocean floor surface or near it. The main goal of this study was to reconstruct the geochemical trends accompanying the carbonation of abyssal peridotites using MAR ultramafic rocks as an example and to identify the main factors that determine their geochemical and mineralogical differences. The composition variations of rock-forming minerals and their characteristic assemblages indicate that the initial stages of carbonation of abyssal peridotites occurred in crustal conditions simultaneously with the serpentinization of these rocks. The final stage in the crustal evolution of the abyssal peridotites is their exhumation on the ocean floor where they were brought up along the detachment faults. On the ocean floor, the abyssal peridotites in close association with gabbro form oceanic core complexes, and the degree of their carbonation sharply increases with time of their exposure on the ocean floor. The presented data made it possible to qualitatively reconstruct the sequence of events that determined the mineralogical and geochemical features of carbonatized abyssal peridotites of the MAR.

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大西洋中脊蛇纹岩的碳酸化作用:1。地球化学趋势与矿物组合
深海橄榄岩露头构成了大西洋、印度洋和北冰洋海底的大片区域,它们是缓慢扩张的海洋脊(大西洋中脊、西南印度洋脊和Gakkel脊)形成的海洋地壳部分不可或缺的一部分。海洋地壳中深海橄榄岩演化的最后阶段是它们在海底表面或海底附近经历的碳酸化。以MAR超镁质岩为例,重建深海橄榄岩碳酸化过程中的地球化学趋势,并找出影响其地球化学和矿物学差异的主要因素。造岩矿物组成变化及其特征组合表明,深海橄榄岩碳酸化的初始阶段与蛇纹岩化同时发生在地壳条件下。深海橄榄岩地壳演化的最后阶段是它们在海底的发掘,它们是沿着拆离断层被带上来的。在海底,与辉长岩密切联系的深海橄榄岩形成海洋岩心杂岩,其碳酸化程度随着暴露时间的增加而急剧增加。所提供的数据使定性地重建事件序列成为可能,这些事件序列决定了MAR碳酸化深海橄榄岩的矿物学和地球化学特征。
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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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