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地球科学进展  1997, Vol. 12 Issue (4): 366-393    DOI: 10.11867/j.issn.1001-8166.1997.04.0366
“北祁连山蛇绿岩及其构造背景研究”专辑     
北祁连蛇绿岩的特征、形成环境及其构造意义
张旗,孙晓猛,周德进,钱青,陈雨,王岳明,贾秀琴,韩松
中国科学院地质研究所 北京 100029;①长春科技大学工程技术学院,长春,130022;②Deptment, Earth Science Dalhousie University, Halifax, NS B3H 3J5, Canada;③甘肃地矿局区调队,兰州,730050;④中国科学院高能物理研究所,北京,100080
THE CHARACTERISTICS OF NORTH QILIAN OPHIOLITES, FORMING SETTINGS AND THEIR TECTONIC SIGNIFICANCE
ZHANG Qi ①, SUN Xiaomeng ②, ZHOU Dejin ① QIAN Qing ①, CHEN Yu③, WANG Yueming ④ JIA Xiuqin ⑤, HAN Song ⑤
 ①Institute of Geology, Chinese Academy of Sciences, Beijing 100029;②Engineering and Technology College, Science and Techn
 全文: PDF(436 KB)  
摘要:

文中总结了北祁连蛇绿岩的特征,指出北祁连蛇绿岩大多具有MORB的性质,有玻安岩产出,形成在弧后和岛弧环境。北祁连蛇绿岩大多侵位在岛弧增生楔或活动陆缘地体之上,蛇绿岩属于科迪勒拉型,早古生代的北祁连造山带属于科迪勒拉型造山带。部分蛇绿岩之上整合产出一套沉积-火山岩系,称为蛇绿岩的上覆岩系。指出蛇绿岩及其上覆岩系的枕状熔岩分别来自不同的源区,具有不同的构造意义。还讨论了北祁连早古生代板块构造格局,认为北祁连洋盆属于古亚洲洋的一部分,可能曾经是一个较大规模的洋盆。

关键词: 北祁连造山带蛇绿岩形成环境洋盆规模构造格架    
Abstract:

The North Qilian ophiolites, with the characteristics mainly of MORB and boninite, were mostly formed at back arc and island arc environment and emplaced over island arc accretion wedge and active continental margin. So, It is possible that the North Qilian ophiolites similar to that of Cordilleran type by geochemical and emplaced characteristics. In North Qilian ophiolite belt, a volcanic sedimentary sequence lies conformably on the top of the ophiolite section, as in the Laohushan and Jiugequan area. The pillow lava at the top of the ophiolite is originated from the magma chamber beneath the spreading ridge, while the pillow lava in the overlying rock sequence is formed from partial melting of the depleted asthenospheric mantle off ridge, so they have different tectonic significance respectively. In the paper, the framework of plate tectonic of early Paleozoic North Qilian, and the periods and scale of North Qilian ocean basin were disccused. It can also be inferred that the North Qilian oceanic basin was a part of the Paleo Asian oceanic, and the scale of the North Qilian ocean basin was probably very large, and similar to that of today’s Pacific ocean.

Key words:  North Qilian orogenic belt    Ophiolite    Forming settings    Scale of oceanic basin
出版日期: 1997-08-01
:  P583  
基金资助:

国家自然科学基金项目“北祁连蛇绿岩特征,造山带演化及深部作用过程研究”(项目编号:49472101)和国家科委高技术司项目资助。

通讯作者: 张旗,男,1937年9月出生,研究员,研究方向为镁铁-超镁铁岩、蛇绿岩。   
作者简介: 张旗,男,1937年9月出生,研究员,研究方向为镁铁-超镁铁岩、蛇绿岩。
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引用本文:

张旗,孙晓猛,周德进,钱青,陈雨,王岳明,贾秀琴,韩松. 北祁连蛇绿岩的特征、形成环境及其构造意义[J]. 地球科学进展, 1997, 12(4): 366-393.

ZHANG Qi ①, SUN Xiaomeng ②, ZHOU Dejin ① QIAN Qing ①, CHEN Yu③, WANG Yueming ④ J. THE CHARACTERISTICS OF NORTH QILIAN OPHIOLITES, FORMING SETTINGS AND THEIR TECTONIC SIGNIFICANCE. Advances in Earth Science, 1997, 12(4): 366-393.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.1997.04.0366        http://www.adearth.ac.cn/CN/Y1997/V12/I4/366

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