| 阴山东段先寒武变质岩的Rb-Sr年代 |
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| 引用本文： | 孙荣圭,Richard Lee Armstrong,孙大中,韩光.阴山东段先寒武变质岩的Rb-Sr年代[J].地质科学,1987,0(3):258-264. |
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| 作者姓名： | 孙荣圭 Richard Lee Armstrong 孙大中 韩光 |
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| 作者单位： | 1. 北京大学地质学系;2. 不列颠哥伦比亚大学地质科学系;3. 天津地质矿产研究所 |
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| 摘 要： | 采自阴山东段先寒武变质岩的全岩样品给出四个等时线年龄。下部集宁群为2497±124Ma;上部乌拉山群为2367±127Ma;上部二道洼群给出两个年龄:2067±39Ma和325±16Ma。据此认为,2.5Ga前发生了麻粒岩化;2.35Ga前发生混合岩化;2.0Ga和0.33Ga前有变质事件叠加。
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| 关 键 词： | 阴山 先寒武 铷-锶年代 |
| 收稿时间： | 1985-12-01 |
| 修稿时间： | 1985-12-01; |
THE Rb-Sr GEOCHRONOLOGY OF PRECAMBRIAN METAMORPHIC ROCKS IN THE EASTERN SECTION OF YINSHAN MOUNTAINS |
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| Sun Ronggui.THE Rb-Sr GEOCHRONOLOGY OF PRECAMBRIAN METAMORPHIC ROCKS IN THE EASTERN SECTION OF YINSHAN MOUNTAINS[J].Chinese Journal of Geology,1987,0(3):258-264. |
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| Authors: | Sun Ronggui |
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| Institution: | 1. Department of Geology, Beijing University, Beijing;2. Department of Geological Sciences, University of British Columbia, Vancouver, B. C., CANADA, V6T 2B4;3. Tianjin Institute of Geology and Mineral Resources, Tianjin |
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| Abstract: | Thirteen whole rock samples from three precambrian metamorphic rock suites in eastern Yinshan Mountains in south-central Inner Mongolia and northern Shanxi Province had been analysed with Rb-Sr isotopic method. Four samples of a suite collected from Lower Jining Group give an isochron with an age of 2497?124 Ma and an initial ratio of 0.7007?0.0011; four samples from Upper Wulashan Group give an isochron with an age of 2367?127 Ma and an initial ratio of 0.7028?0.0015; five samples from Upper Erdaowa Group give two is-ochrons, one of them with an age of 2067?39 Ma and initial ratio of 0.7061?0.0003, and another one with an age of 325?16 Ma and an initial ratio of 0.7065?0.0002. According to above results, some model dates and some results given by other Chinese geologists, we suppose that the Jining Group, Wulashan Group and Sanheming Group belong to the upper part of Upper Archean (3.0-2.5 Ga old), whereas the Erdaowa Group belongs to the Lower Proterozoic (2.5-2.0 Ga). The granulitization took place at the end of Archean (2.5 Ga); the migmatitization occurred in Early Proterozoic (2350 Ma ago); and there were two metamorphic resetting at the end of Early Proterozoic (2.0 Ga) and Hercynian cycle (325 Ma) in this area. |
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| Keywords: | Yinshan Mts Precambrian Rb-Sr dates |
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