| 桐柏造山带东段结晶基底杂岩中的大型A型背形及其构造背景 |
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| 引用本文： | 王国灿,桑隆康.桐柏造山带东段结晶基底杂岩中的大型A型背形及其构造背景[J].地球科学,1996,5(3). |
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| 作者姓名： | 王国灿 桑隆康 |
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| 作者单位： | 地球科学学院 |
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| 基金项目： | 地矿部1∶5万应山幅区调项目,国家自然科学基金 |
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| 摘 要： | 通过对桐柏山东段广水－孝子店一带桐柏杂岩及红安群的构造解析，提出桐柏杂岩中发育－北西－南东走向并向南东倾伏的大型Ａ型背形．利用变形矿物变质温压计估算其形成温度为５３０～６９０℃，压力为０．５２～０．６２ＧＰａ，相当于１８～２２ｋｍ深的中地壳流动壳层．据Ａ型背形不同部位物质运动特点分析，其形成很可能是古元古代晚期华北古板块与杨子古板块碰撞对接造成桐柏杂岩向南东方向侧向挤出的结果
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| 关 键 词： | 桐柏造山带，桐柏杂岩，A型背形，古板块碰撞 |
A GIGANTIC A-TYPE ANTIFORM AND ITS TECTONIC SETTING IN TONGBAI GNEISS COMPLEX, EASTERN TONGBAI OROGEN, CENTRAL CHINA |
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| Wang Guocan Sang Longkang.A GIGANTIC A-TYPE ANTIFORM AND ITS TECTONIC SETTING IN TONGBAI GNEISS COMPLEX, EASTERN TONGBAI OROGEN, CENTRAL CHINA[J].Earth Science-Journal of China University of Geosciences,1996,5(3). |
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| Authors: | Wang Guocan Sang Longkang |
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| Abstract: | The gneissosity attitude changes of the Tongbai gneiss complex in Guangshui-Xiaozidian area, eastern Tongbai orogen, demonstrate a gigantic northwest -southeast trending antiform plunging southeastward. The kinematic characteristics in different parts of the antiform prove it to be an A-type antiform formed in the middle crust. By comparing the deformation differences between the Tongbai gneiss complex and the Hongan Group, this A-type antiform was formed before the depositon of the Hongan Group, a set of Mesoproterozoic volcanic-sedimentary sequence , and was probably the product of the collision between the North China palaeo-plate and the Yangtze palaeo-plate during late-Paleoproterozoic. |
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| Keywords: | eastern Tongbai orogen Tongbai gneiss complex A-type antiform palaeo plate collision |
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