| 内蒙古甘珠尔庙变质核杂岩 |
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| 引用本文： | 张履桥,邵济安.内蒙古甘珠尔庙变质核杂岩[J].地质科学,1998,33(2):140-146. |
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| 作者姓名： | 张履桥 邵济安 |
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| 作者单位： | 1. 内蒙古地质研究所 呼和浩特 010020;2. 北京大学 北京 100871;3. 内蒙古地勘局第十勘查开发院 赤峰 024005 |
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| 摘 要： | 本文讨论了出露在大兴安岭主峰穹状复背斜核部的变质核杂岩。从岩石组合、变质温压条件、变形特征角度阐明了变质核杂岩的结构。从变质核杂岩各层之间的产状关系进一步探讨了变质核杂岩隆升时间以及与大兴安岭隆升的关系。最后通过核部侵位的超镁铁-镁铁质岩探讨了变质核杂岩隆升的深部背景。
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| 关 键 词： | 变质核杂岩 热隆 韧性变形 |
| 收稿时间： | 1996-09-24 |
| 修稿时间： | 1996-09-24; |
METAMORPHIC CORE COMPLEX IN GANZHUERMIAO, INNER MONGOLIA |
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| Zhang Lüqiao,Shao Ji’an,Zheng Guangrui.METAMORPHIC CORE COMPLEX IN GANZHUERMIAO, INNER MONGOLIA[J].Chinese Journal of Geology,1998,33(2):140-146. |
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| Authors: | Zhang Lüqiao Shao Ji’an Zheng Guangrui |
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| Institution: | 1. Geological Bureau of Inner Mongolia, Huhehaote 010020;2. Peking University, Beijing, 100871;3. Geoexploration Bureau of Inner Mongolia, Chifeng 024005 |
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| Abstract: | The Ganzhuermiao metamorphic core complex is found in the core of a quaquaversal anticalinoria in Da Hinngan Met.,composed of three parts:the core of Early Permian low amphibolite facies-high greenschist facies rocks with ductile deformation,the intermediate layer of Middle Jurassic sandrock slate with plasitic deformation and hornfelsing,and the overlying layer of Late Jurassic volcanic rocks,clastic rocks,and concurrent granite with brittle deformation but without metamorphism. Detachment surfaces exist between the above mentioned parts.The extensional lineations in the flat slip planes and associated folds show that the layers abovethe detachment surfaces slipped downward NW and SE symmtrically and the underlying blocks detached continuously and rised to the superficial layer when the metamorphic core complex was upwelling,whereas the ultramafic mafic rocks intruding into the core were exhumed. It is inferred from the difference between the respective metamorphism and deformation characterstics of the Middle and Late Jurassic formations that thermal metamorphism of the metamorphic core complex occurred at the end of the Middle Jurassic,and that its abrupt rising and the downward sliding of the overlaying layers happened at the end of the Late Jurassic or at the Early Creataceous. It is the thermal uplifting that caused extension but not on the contrary. |
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| Keywords: | Metamorphic core complex Thermal uplifting Ductile deformation Inner Mongolia |
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