| 江绍断裂两侧早元古代变质基底特征及形成的构造环境 |
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| 引用本文： | 赵风清，金文山，甘晓春.江绍断裂两侧早元古代变质基底特征及形成的构造环境[J].安徽地质,1994(Z1). |
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| 作者姓名： | 赵风清，金文山，甘晓春 |
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| 作者单位： | 天津地质矿产研究所 |
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| 摘 要： | 江绍断裂东侧出露的早元古代变质基底以一套遭受中压型角闪岩相区域热流变质作用改造的黑云斜长变粒岩、云母石英片岩为主，夹少量斜长角闪岩和大理岩，已遭受４期构造变形作用改造，从原岩建造和主要岩类地球化学特点推测它可能形成于大陆或大陆边缘类似于内硅铝盆地环境。江绍断裂西侧早元古代变质基底则以星子杂岩为代表，由变粒岩、浅粒岩、（十字一石榴）云母片岩和少量斜长角闪岩组成，已遭受中压型高绿片岩相一低角闪岩相区域热流变质作用改造，推测其形成于活动性较强大陆一大陆边缘环境。江绍断裂两侧早元古代变质基底在原岩建造、变质一变形作用等特征上存在明显差异，因此华夏地块和扬子地块在早元古代可能是两个地块。
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| 关 键 词： | 江绍断裂，早元古代，变质基底，大陆一大陆边缘，构造环境 |
CHARACTERISTICS AND TECTONIC SETTINGS OF THE PALEO-PKOTEROZOIC METAMORPHIC BASEMENT ON BOTH SIODES OF THE JIANGSHAO FAUL |
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| Zhao Fengqing; Jin Wenshan; Gan Xiaochun.CHARACTERISTICS AND TECTONIC SETTINGS OF THE PALEO-PKOTEROZOIC METAMORPHIC BASEMENT ON BOTH SIODES OF THE JIANGSHAO FAUL[J].Geology of Anhui,1994(Z1). |
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| Authors: | Zhao Fengqing; Jin Wenshan; Gan Xiaochun |
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| Institution: | Tianjing Institute of Geology and Mineral Resources |
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| Abstract: | The paleo- proterozoic metamorphic basement in the Huaxia block eastern side of the Jiangshao fauit,iscomposed mainly of biotite plagioclase leptites,quartz mica schists interlayered with a small amounts of amphibolites andmarbles, which has been subjected to middle-pressure amphibolitic facies metamorphism and four episodes of tectonic de-formation. It was probably formed in a continent or continental margin from its protolith formation and geochemical characteristics.The paleo- Proterozoic metamorphic basement of the Yangtze block on the Western side of the Jiangshaofault is mainly outcropped in the Lushan mountains , named Xingzi complex,which is composed of biotite leptites,(stau-rolitegarnet)mica schists and mica quartz schists interlayered with amphibolites.It was formed in a more mobile continentor continental margin than the Huaxia block.There are some differences between the Huaxia block and Yangtze block inprotolith formation , metamorphism and deformation , which suggests that the two blocks did exist in South China in thepaleo-Proterozoic. |
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| Keywords: | Jiangshao fault paleo-Proterozoic metamorphic basement continent-continental margin tectonic setting |
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