| 辽西地区中元古代变质岩系的初步研究 |
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| 引用本文： | 俞良军,刘正宏,郑长青,徐仲元.辽西地区中元古代变质岩系的初步研究[J].地质科学,2000,35(2):161-167. |
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| 作者姓名： | 俞良军 刘正宏 郑长青 徐仲元 |
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| 作者单位： | 1. 中国科学院地质研究所岩石圈构造演化开放研究实验室 北京 100029;2. 长春科技大学地球科学系 长春 130026 |
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| 基金项目： | “八五”1∶ 5万区调成果之一 |
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| 摘 要： | 辽西地区中元古代变质表壳岩包括石英岩、千枚岩-片岩、大理岩及细粒长英质片麻岩和少量阳起石片岩,为中酸性火山活动及钙碱性玄武岩活动之后的海进型沉积旋回,显示出一套较为连续的火山-沉积系列。变质深成岩以斜长花岗质片麻岩为主体。根据同位素测年、微古植物化石分析及与地层的接触关系等,厘定它们为中元古代产物。在中元古代该区经历了大陆边缘岛弧的形成、发展过程。
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| 关 键 词： | 中元古代 变质岩系 大陆边缘岛弧 辽西 |
| 收稿时间： | 1998-04-28 |
| 修稿时间： | 1998年4月28日 |
PRELIMINARY STUDY ON THE MID PROTEROZOIC METAMORPHIC ROCKS IN WEST PART OF LIAONING PROVINCE |
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| Yu Liangjun,Liu Zhenghong,Zheng Changqing,Xu Zhongyuan.PRELIMINARY STUDY ON THE MID PROTEROZOIC METAMORPHIC ROCKS IN WEST PART OF LIAONING PROVINCE[J].Chinese Journal of Geology,2000,35(2):161-167. |
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| Authors: | Yu Liangjun Liu Zhenghong Zheng Changqing Xu Zhongyuan |
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| Institution: | 1. Institute of Geology, Chinese Academy of Sciences, Beijing 100029;2. Department of Earth Sciences, Changchun University of Science and Technology, Changchun 130026 |
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| Abstract: | The metamorphic supracrustal rocks in the western part of Liaoning province include quartzite, phyllite-schist, marble, fine-grained felsic gneiss and a small proportion of actinolite schist. It is a sedimentary cycle of marine transgression after subalkalic basaltic activity and intermediate-acid volcanic eruption. The marble yields a Rb-Sr whole rock isochron age of 1036 Ma, which is intruded by the metamorphic plutonic rocks (plagiogranitic gneiss) dated 1155 Ma. The Rb-Sr isochron ages, palaeontology and contact relation with the Archean strata, indicate the supracrustal rocks are in an age of Mid Proterozoic. The tectonic setting revealed by the petrochemical features may comprehend an island arc occurriing in the northern continental margin of North China during Mid Proterozoic. |
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| Keywords: | Mid Proterozoic Metamorphic Rocks Island Arc West Liaoning |
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