| 拉鸡山造山带的蛇绿岩套及古构造环境 |
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| 引用本文： | 曾广策,邱家骧,朱云海.拉鸡山造山带的蛇绿岩套及古构造环境[J].青海国土经略,1997(1). |
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| 作者姓名： | 曾广策 邱家骧 朱云海 |
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| 作者单位： | 中国地质大学 武汉
(曾广策，邱家骧)，中国地质大学 武汉(朱云海) |
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| 摘 要： | 传统认为蛇绿岩套由超基性岩、含枕状构造的基性熔岩和硅质岩组成,是大洋岩石圈的碎片,具有完整的5个或4个层序。但经深入研究后发现,蛇绿岩有不同的类型,可产在不同的构造环境区。从层序、岩性、岩性组合特征来看,拉鸡山存在蛇绿岩套。拉鸡山蛇绿岩套厚度小、层序不全、岩性变化大,不是大洋中脊产物,其岩石学特点与初始洋盆蛇绿岩套相同。拉鸡山蛇绿岩套是中寒武世陆间裂谷拉张到最宽时的小洋盆中形成的,属于陆间裂谷型小洋盆蛇绿岩套。
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| 关 键 词： | 青海拉鸡山 蛇绿岩套 古构造环境 |
OPHIOLITIC SUITE OF LAJISHAN OROGENIC BELT AND ITS PALEOTECTONIC SETTING |
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| Authors: | Zeng Guangce Qiu Jiaxiang Zhu Yunhai China University of Geoscience Wuhan |
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| Abstract: | According to traditional view, ophiolitic suite, the fragments of ocean litho-sphere, is composed of ultrabasic rocks, basic laves with pillow structure and siliceous rocks,and included 5 or 4 complete sequences. After deep studying, we have found that ophiolitescan be divided into several types and developed in different tectonic setting. Based on thecharacteristics of sequence, lithology, and lithologic association, we believe that there is aophiolitic suite in Lajishan. The ophiolitic suite of Lajishan is not the product of oceanic-ridgefor its thin, incomplete sequence, and various lithology, but resemble to the ophiolitic suite ofinitial oceanic basin. It was formed in minor oceanic basin when the intra-continent riftopened to its widest in Middle Cambrian period. So it belongs to the ophioltic suit of intra-continent rift type in minor oceanic basin. |
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| Keywords: | Lajishan Qinghai ophiolitic suit paleo-tectonic setting |
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