豫鄂境内桐柏山—大别山双变质带 |
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引用本文: | 张兆忠,张秉良,冯锦江,李松滨.豫鄂境内桐柏山—大别山双变质带[J].地震地质,1981,3(4):27. |
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作者姓名: | 张兆忠 张秉良 冯锦江 李松滨 |
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作者单位: | 国家地震局地质研究所
(张兆忠,张秉良,冯锦江),国家地震局地质研究所(李松滨) |
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摘 要: | 本文根据变质程度、标型矿物组合特征及多硅白云母b_0值等,将研究区的变质岩系从南向北分为三个不同压力类型的变质带:Ⅰ带(高压带)、Ⅱ带(中高压带)、Ⅲ带(低压带)。这三个不同压力类型的变质带很可能是两对时代不同的双变质带。在Ⅰ、Ⅱ带内均出露有蛇绿岩系和混杂堆积,其中之基性火山岩属深海拉斑玄武岩,它们很可能形成于大洋脊,侵位堆积于消减带
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关 键 词: | 大别山 双变质带 b0值 多硅白云母 桐柏山 岩体 千巴 累积频率曲线 早古生代 片岩 |
THE TONGBAISHAN-DABIESHAN PAIRED METAMORPHIC ROCK BELT IN HENAN AND HUBEI PROVINCES |
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Abstract: | According to the metamorphic grades, mineral paragenesis, index minerals and the b0 values of phengites, the metamorphic rocks formed in Dabie Mountains may be divided, from south to north, into three metamorphic belts having different pressure types, Ⅰ, Ⅱ and Ⅲ. The blet I is situated mainly on the southern edge of the Da-bieshan and has the index minerals such as piedontite, stilpnomelane, glaucophane, chlo-ritoid and types 2M-and 3T-phengites. The mean b0 value of muscovites, 9.049 A. and the |
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