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信阳群的解体及其大地构造意义
引用本文:刘志刚,牛宝贵.信阳群的解体及其大地构造意义[J].地质论评,1992,38(4):293-301.
作者姓名:刘志刚  牛宝贵
作者单位:中国地质科学院地质研究所 北京
摘    要:通过对原信阳群标准地层剖面的深入研究,查明该岩石—地层单位实属变形十分复杂的构造地层体。古生物资料表明,原信阳群南湾组确属中—晚泥盆世地层;而同位素定年结果则显示,原信阳群龟山组纯系前泥盆纪变质杂岩组成的构造地层体。据此,笔者认为原信阳群应解体。本文着重从岩石、构造分析入手,对新解体出的不同地质体分别就其地层涵义、构造归属作了较系统的论述,并扼要阐明各自发展演化的大地构造意义。

关 键 词:信阳群  地层  解体  泥盆世  地质意义

DISINTEGRATION OF THE XINYANG GROUP AND ITS TECTONIC IMPLICATIONS
Liu Zhigang,Niu Baogui,Ren Jishun Institute of Geology,Chinese Academy of Geological Sciences,Beijing.DISINTEGRATION OF THE XINYANG GROUP AND ITS TECTONIC IMPLICATIONS[J].Geological Review,1992,38(4):293-301.
Authors:Liu Zhigang  Niu Baogui  Ren Jishun Institute of Geology  Chinese Academy of Geological Sciences  Beijing
Abstract:The original Xinyang Group should be disintegrated into two parts, i. e., theGuishan tectono--stratigraphic terrane and the Nanwan Formation. The former,consisting of an Early Paleozoic calc--alkaline volcanosedimentary sequence, includesa series of thrust--imbrication sheets tectonically emplaced in the major sutureduring the Caledonian subduction and collision orogeny. The latter is composed ofthe sediments deposited in the foreland basin of the Caledonian collisional oroge-nic belt, in which many Middle to Late Devonian microfossils, such as spores,scol-ecodents, chitinozoans and acritarchs, have been found.Thus this formation maybe correlated to the Liuling Group in the eastern Qinling orogenic belt. The aboveresults sufficiently prove that the Dabieshan--Tongboshan area is part of the Qi-nling orogenic belt and that the major suture of the belt is located along theTianshui-Danfeng-Xinyang-Shucheng line.
Keywords:northern Dabie Mountaia  disintegration of the Xinyang Group  Middle--Upper Devonian series  Pre--Devonian metamorphic terrane
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