| 贺兰山群变质杂岩主变质期的时代探讨 |
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| 引用本文： | 胡能高,杨家喜.贺兰山群变质杂岩主变质期的时代探讨[J].地球科学与环境学报,1993(1). |
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| 作者姓名： | 胡能高 杨家喜 |
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| 作者单位： | 西安地质学院地勘系 710054
(胡能高)，西安地质学院地勘系 710054(杨家喜) |
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| 摘 要： | 分布在贺兰山脉北端的贺兰山群变质杂岩是一套变质程度已达角闪麻粒岩相的孔兹岩系。以往的研究者均认为它的主期变质作用发生在中太古代。本文利用变质岩中矿物的Rb/Sr等时线年龄,同变质花岗岩全岩Rb/Sr等时线年龄及变质岩和花岗岩中锆石~(207)Pb/~(206)Pb年龄值结合地质事实,证明这套变质岩的主期变质作用发生在早元古代。
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| 关 键 词： | 华北地台 贺兰山群 孔兹岩系 麻粒岩相 |
DISCUSSION ON THE AGE OF THE MAIN METAMORPHISM IN THE HELANSHAN GROUP |
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| Hu Nengao Yang Jiaxi.DISCUSSION ON THE AGE OF THE MAIN METAMORPHISM IN THE HELANSHAN GROUP[J].Journal of Earth Sciences and Environment,1993(1). |
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| Authors: | Hu Nengao Yang Jiaxi |
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| Institution: | Geoloyicl prospecting Department of Xi'an college of Geology)) |
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| Abstract: | The metamorphic complex of the Helanshan Group. being situated on the north HeIanshan Range. is a Kho-daliteseries. and the metamorphic grade reached the amphibole granul:te fac:es. It was considered that the main metamorphism of the Helanshan Group took place in the Middle Archean era. In fact, the Rb -Sr mineral isochron of gneiss. Rb - Sr wholerock isochron of the synmetamorphic granites and207Pb/206Pb ages of zircons of various rocks demonstrate that the main metarnorphism of the Helanshan Group took place in the earlyProterozoic era. |
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| Keywords: | Chronology of isotope geolgy North China Massif Helanshan Group Khondalite series granulite facies |
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