滇西南镁铁质-超镁铁质岩石的成因及构造意义

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Qing Shi, Nianqiao Fang
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引用次数: 2

摘要

本文以云南西南部芒新地区早石炭世露头的基性-超基性熔岩为研究对象。含26-32 wt% MgO和淬火结构的苦橄岩是该岩石组合中最重要的组成部分。本文将芒心苦橄岩分为两类。这些苦橄岩的地幔位温(Tp)高于洋中脊的范围,并达到地幔柱的范围。从其地球化学特征来看,1型苦橄橄岩可能是由地幔柱头部熔融形成的,并受到周围衰竭地幔的污染,而2型苦橄岩则是由地幔柱尾部熔融形成的。这些与烟柱有关的锰新基性-超基性岩石和长宁-孟连带许多地区的洋岛玄武岩-碳酸盐岩组合,为改进古特提斯期海洋高原的以往模式提供了重要证据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Petrogenesis and tectonic significance of mafic-ultramafic rocks from southwestern Yunnan, China

This study focuses on the mafic-ultramafic lavas of the Early Carboniferous outcrop in Mangxin, southwestern Yunnan, China. Picrites with 26–32 wt% MgO and a quenched texture are the most significant components of this rock association. This article divides the Mangxin picrites into two types. The mantle potential temperature (Tp) of these picrites is higher than the Tp range of mid-ocean ridges and reaches that of mantle plumes. According to their geochemical characteristics, type-1 picrites probably formed from the melting of the mantle plume head and were contaminated by the ambient depleted mantle, whereas type-2 picrites formed from the melting of mantle plume tails. These plume-related mafic-ultramafic rocks in Mangxin and the ocean island basalt (OIB)-carbonate rock associations in many areas of the Changning–Menglian belt provide significant evidence for the improvement of previous models of the Palaeotethyan oceanic plateau.

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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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