| 张八岭地区中生代岩体中黑云母的40Ar-39Ar年龄及其地质意义 |
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| 引用本文： | 牛漫兰.张八岭地区中生代岩体中黑云母的40Ar-39Ar年龄及其地质意义[J].地质科学,2006,41(2):217-225. |
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| 作者姓名： | 牛漫兰 |
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| 作者单位： | 合肥工业大学资源与环境工程学院 合肥 230009 |
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| 摘 要： | 张八岭地区顺郯庐断裂带由北向南出露了管店、瓦屋刘和瓦屋薛3个岩体,岩性分别为花岗闪长岩、石英二长岩和花岗岩。对其中两个侵入岩体中黑云母进行了40Ar-39Ar定年研究。张八岭隆起北段瓦屋刘石英二长岩和瓦屋薛花岗岩中黑云母的40Ar-39Ar坪年龄分别为127.84±0.77Ma和119.97±0.64Ma,表明岩浆活动主要发生在早白垩世中期。结合最近断裂带内走滑糜棱岩中角闪石143.3±1.3Ma的40Ar-39Ar年龄,暗示了早白垩世中期断裂带内出现岩浆活动时,郯庐断裂带已转变成正断层活动,而不是以往认为由断裂带走滑诱发的岩浆活动,与华北地块东部岩石圈减薄的峰期时间基本一致。
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| 关 键 词： | Ar-Ar年代学 岩石圈减薄 郯庐断裂带 中生代侵入岩 |
| 文章编号： | 0563-5020（2006）02-0217-09 |
| 收稿时间： | 2005-04-17 |
| 修稿时间： | 2005-05-08 |
40Ar-39Ar DATING OF BIOTITE FROM THE MESOZOIC INTRUSIONS IN ZHANGBALING AREA AND ITS GEOLOGICAL SIGNIFICANCE |
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| Niu Manlan.40Ar-39Ar DATING OF BIOTITE FROM THE MESOZOIC INTRUSIONS IN ZHANGBALING AREA AND ITS GEOLOGICAL SIGNIFICANCE[J].Chinese Journal of Geology,2006,41(2):217-225. |
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| Authors: | Niu Manlan |
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| Institution: | College of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009 |
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| Abstract: | Three extended intrusions, in southward order, the Guandian granodiorite, the Wawuliu quartz monzonite and the Wawuxue granite occurred in Zhangbaling area, Anhui, along the Tan-Lu fault zone. The 40Ar-39Ar dating of biotites from the latter two intrusions was made. The 40Ar-39Ar plateau ages of biotites from the Wawuliu quartz monzonite and Wawuxue granite yielded 127.84?0.77 Ma and 119.97?0.64 Ma, respectively. The mentioned above dating results implied that the Mesozoic magmatism in the northern segment of the Zhangbaling Rise along the Tan-Lu fault zone mainly occurred in the middle period of Early Cretaceous. Combined with 40Ar-39Ar ages (143.3?1.3 Ma) of the homblendes from the mylonites of the Tan-Lu fault zone, it suggested that the Tan-Lu fault zone had turned into extensional movement at the middle period of Early Cretaceous, and the magmatic activities might not be induced by strike-slipping of the Tan-Lu fault zone, which was coincident with lithospheric thinning peak time in eastern North China Block. |
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| Keywords: | 40Ar-39Ar datings Lithospheric thinning The Tan-Lu fault zone Mesozoic intrusions |
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