| 福建永定地区下、中元古界变质岩基本特征及地层时代依据 |
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| 引用本文： | 马金清,王文腾.福建永定地区下、中元古界变质岩基本特征及地层时代依据[J].福建地质,1993,12(4):268-279. |
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| 作者姓名： | 马金清 王文腾 |
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| 作者单位： | 福建省区域地质调查队，福建省区域地质调查队 三明 365001，三明 365001 |
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| 摘 要： | 闽西永定地区的中深变质岩系经调查主要岩石组合为变粒岩、片岩、变质火山岩及少量石英岩,变质程度达低角闪岩相,构造形变特征明显有别于区域内的震旦纪楼子坝群,获得同位素年龄1825—1628 Ma。据此认为,这套变质岩不属于原划定的楼子坝群,应分属于下、中元古界。对该地层所夹变质火山岩的形成环境,本文亦进行了讨论。
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| 关 键 词： | 变质岩 地质时代 下、中元古界 永定地区 |
Basic Characteristics and the Stratigraphic-Time Basis of Middle and Lower Proterozoic Metamorphic Rocks in the Yongding Area of Fujian Province |
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| Ma Jinqing Wang Wenteng.Basic Characteristics and the Stratigraphic-Time Basis of Middle and Lower Proterozoic Metamorphic Rocks in the Yongding Area of Fujian Province[J].Geology of Fujian,1993,12(4):268-279. |
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| Authors: | Ma Jinqing Wang Wenteng |
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| Abstract: | The lithological association of medium-grade and hypometamorphic rocks in the Yongding area of Northwestern Fujian mainly is granoblastite, schist, matamorphic volcanic rocks and a few of quartzite, the metamorphic range of which reaches lower amphibolite facies. The characteristics of the tectonic deformation are obviously different from that of the Louziba Group strata (Sinian period) in the region. The isotopic age of the metamorphic rocks is between 1 825 and 1 628 Ma. Therefore, it is concluded that the metamorphic rocks are of Middle and Lower Proterozoic instead of Louziba Group. In the paper, the authors also have a discussion on the environment of forming the interbedded metamorphic volcanic rock in the strata. |
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| Keywords: | metamorphic rock Middle and Lower Proterozoic stratigraphic time Yongding area |
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