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首页> 外文期刊>Science in China. Series D, Earth sciences >Geochemistry and chronology of the Jiehekou Group metamorphic basic volcanic rocks in the Lueliang Mountain area, Shanxi, China
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Geochemistry and chronology of the Jiehekou Group metamorphic basic volcanic rocks in the Lueliang Mountain area, Shanxi, China

机译：山西吕梁山区界河口组变质基本火山岩的地球化学和年代学

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摘要

Samples were systematically collected from metamorphic basic volcanic rocks in the Jiehekou and Xiyupi areas on both sides of the Luliang Mountains, Shanxi Province and analyzed for their major elements, trace elements and rare earth elements (REE). The geochemical characteristics of their major, trace and rare-earth elements indicated that the metamorphic basic volcanic rocks in this area were emplaced in the tectonic environment like a modern continental rift. Sm-Nd and Rb-Sr isotope chronological studies demonstrated that the Jiehekou Group metamorphic basic volcanic rocks were formed during the 2600-Ma crust/mantle differentiation event, and were transformed by granulite facies metamorphism during the late Neo-Archaean period (2500 Ma ?), making the Sm-Nd systematics of the rocks reset. During the late Paleoproterozoic period (1800 Ma ±) the Rb-Sr systematics of the rocks were disturbed again in response to the Luliang movement. Since the extent of disturbance was so weak that the Sm-Nd systematics was not affected, the age of 1600 Ma ± obtained from this area seems to be related to local magmatic activities within the craton. Research results lend no support to the idea that the Luliang Group was formed during the Archaean. Instead, it should be formed during the Proterozoic.
机译：系统地从山西省吕梁山两侧的界河口和西屿meta地区变质的基础火山岩中采集了样品，并对其主要元素，微量元素和稀土元素（REE）进行了分析。它们的主要，微量和稀土元素的地球化学特征表明，该地区的变质基本火山岩像现代大陆裂谷一样被置于构造环境中。 Sm-Nd和Rb-Sr同位素年代学研究表明，界河口组变质基本火山岩是在2600-Ma地壳/地幔分化事件中形成的，并在新Archaean晚期（2500 Ma）由粒相变质作用转化而成。 ？），使岩石的Sm-Nd系统复位。在古元古代晚期（1800 Ma±），响应陆良运动，岩石的Rb-Sr系统再次受到干扰。由于扰动程度太弱以致Sm-Nd系统学不受影响，因此从该地区获得的1600 Ma±年龄似乎与克拉通内的局部岩浆活动有关。研究结果不支持吕梁集团在古细菌时代成立的观点。相反，它应该在元古代时期形成。

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