| 豫陕中-晚元古代沉积盆地(一) |
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| 引用本文： | 孙枢,从柏林,李继亮.豫陕中-晚元古代沉积盆地(一)[J].地质科学,1981,0(4):314-322. |
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| 作者姓名： | 孙枢 从柏林 李继亮 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 河南西部和陕西东部的秦岭以北地区,以及山西南部中条山地区,广泛分布的中、上元古界未变质地层,近年来受到越来越多的重视。由于剖面完整,厚度巨大,沉积建造又别具一格,因而多将本区视为华北断块上一个独立的地层和沉积分区。本文着重讨论该盆地类型及其与东秦岭拉张运动的关系<1,2]。
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| 关 键 词： | , |
| 收稿时间： | 1980-11-29 |
| 修稿时间： | 1980-11-29; |
EVOLUTION OF THE HENAN-SHANXI SEDIMENTARY BASIN OF THE MIDDLE AND LATE PROTEROZOIC AGE (PART Ⅰ) |
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| Sun Shu,Cong Bolin,Li Jiliang.EVOLUTION OF THE HENAN-SHANXI SEDIMENTARY BASIN OF THE MIDDLE AND LATE PROTEROZOIC AGE (PART Ⅰ)[J].Chinese Journal of Geology,1981,0(4):314-322. |
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| Authors: | Sun Shu Cong Bolin Li Jiliang |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | A middle-late Proterozoic sedimentary basin of the aulacogen type is recently recognized in the southern part of the North China Fault Block region (North China Platform).In both western Henan and southeastern Shanxi north of the Qinling Geosyncline,the middle and upper Proterozoic sequences of thickness more than 7000 m overlie unconformably the Archean and lower Proterozoic metamorphic basement,and have been classified into the Xionger (ca.1700-1300 m.y.),Kuyang (ca.1300-1050m.y.) and Luoyu (ca.1050-850 m.y.) Groups and their equivalents.The accumulation of the Xionger Group dominated by volcanic rocks is controlled by the lithospheric and basement faults.The fault-bounded aulacogen opens to and merges into the Qinling Geosyncline in the south and extends in NNB-NS direction toward the interior of the North China Platform (Fig.1).Petrochemical studies show that the volcanic rocks of the Xionger Group are the products of the early stage of rifting,and mainly belong to the shoshonitic series or the alkaline rock series of the Coombs trend and/or straddle trend with a small amount of the alkaline rocks of the Kennedy trend defined by Miyashiro (1978) (Fig.2-5).In the northern slope of the Eastern Qinling Mountains,the Kuanping Group may be the equivalent of the Xionger Group and comprises metamorphosed and strongly folded volcanic rocks.Their petrochemical characteristics show that they belong to the bimodal volcanic rock suite consisting of the basic members of tholeiitic series and the acid members of calc-alkaline rock series (Fig.2-5),and that they represent the eruptive products during the initial stage of the oceanic basin evolution.On the basis of the above-mentioned studies,the authors come to the conclusion that the genetic relationship between the Xionger Group and the Kuanping Group reveals the early development of a triple junction rift system during the Middle Proterozoic.The continental rift separation along the active arms produced the Qinling geosynclinal trough,which received the Kuanping volcanic suite.At the same time the abandoned arm evolved in the Henan-Shanxi aulacogen with the volcanism dominated by shoshonitic series.Therefore,the rifting history of the southern margin of the North China Platform is proposed. |
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