| 断层泥自生伊利石年龄分析及其在龙门山断裂带的应用 |
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| 关键词:brittle fault fault gouge illite dating tectonic activity |
| 基金项目:国家自然科学基金项目(编号: 41830217; 41520104006; 41602218);中国地质科学院基本科研业务费项目(编号: J1704) |
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| Authigenic Illite Age Analysis for Fault Gouge and Its Application to the Longmen Shan Fault Belt |
| The ductile shear zone and the uplift/exhumation rate can be dated or calculated directly through various isotopic dating methods. In contrast, because the shallow crustal faulting occurs in the low-temperature brittle regime and the new growing mineral phases are mixed with old mineral phases, the result of brittle fault dating represents a mixed age instead of the true faulting time. In recent years, authigenic illite age analysis for fault gouge has a promising application in dating of brittle faults. This paper introduces the formation mechanism of authigenic illite, its morphologic characters, and dating principle. In addition, sample preparation and illite polytype quantification methods are also introduced briefly in this paper. There is a good application of this method in fault dating for the Longmen Shan fault belt and its front klippen, which provides a direct timing constraint on the early tectonic activities on the eastern margin of the Tibetan Plateau. |
| ZHENG Yong,LI Hai-bing,WANG Shi-guang,,BAI Ming-kun.2019.Authigenic Illite Age Analysis for Fault Gouge and Its Application to the Longmen Shan Fault Belt[J].Acta Geoscientica Sinica,40(1):173-185. |
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