| 河南中部晚太古代登封群和太华群成岩构造环境和区域变质带的讨论 |
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| 引用本文：涂绍雄.1984.河南中部晚太古代登封群和太华群成岩构造环境和区域变质带的讨论[J].地球学报,6(1):39-56. |
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| 中文摘要:<正> 有关太古代绿岩带的构造环境和变质作用,近年来国内外都讨论得十分热烈。本文根据作者参加河南中部地区晚太古代变质铁矿研究过程中所收集的资料,对这个地区的成岩构造环境和变质带进行讨论。 |
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| ON THE TECTONIC ENVIRONMENTS AND METAMORPHIC BELTS OF THE LATE ARCHEAN DENGFENG GROUP AND TAIHUA GROUP FROM CENTRAL HENAN,CHINA |
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| Abstract:The Dengfeng Group and Taihua Group of Late Archean from central Henan show a unique feature of rock formation and protolith association which cannot be simply compared with those of the greenstone belts in the other part of the world. In general, the rock formation and protolith association of the Dengfeng Group reflect the development history of an island arc region, while those of the Taihua Group reflect the development history of an ancient tiench arc-trench gap region. These two groups can be related in terms of plate tectonic theory.The central Henan is divided into three metamorphic belts. The Songshan -Xuchang metamorphic belt corresponds to the medium temperature-medium pressure amphibolite facies with metamorphic temperatures of 475-500℃ and pressures of 4.5-7.0kb. The Jishan-Beiwudu metamorphic belt probably corresponds to the low temperature greenschist-epidote amphibolite facies, although its metamorphic pressures still remain undetermined. The Lushan-Wuyang metamorphic belt corresponds to the high temperature-low pressure amphibolite facies with metamorphic temperatures of 620-625℃ and pressures around 4 kb.These three metamorphic belts are arranged in order of southward direction. First two metamorphic belts are found in Dengfeng Group and probaly belong to the same medium pressure metamorphic belt with symmetric texture included in an island arc series; whereas the last metamorphic belt occurs in Taihua Group which had lay to an ancient trench or arc-trench gap region and due to special tectonic environments (thin crust, high temperature, little plate, steep subduction belt and slow subduction speed etc.), it results in a low pressure-high temperature amphibolite facies metamorphic belt instead of high pressure-low temperature glaucophane-schist belt. |
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