Post-Early Cretaceous denudation history of the northeastern Sichuan Basin constraints from low-temperature thermochronology profiles
文献类型：期刊论文
| 作者 | Tian Yun-Tao1; Zhu Chuan-Qing1; Xu Ming1; Rao Song1; Kohn, Barry P.2; Hu Sheng-Biao1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2011-03-01 |
| 卷号 | 54期号:3页码:807-816 |
| 关键词 | Low-temperature thermochronology Thermal history modeling Denudation Northeastern Sichuan Basin |
| ISSN号 | 0001-5733 |
| DOI | 10.3969/j.issn.0001-5733.2011.03.021 |
| 文献子类 | Article |
| 英文摘要 | Previously reported apatite fission track (AFT) data from surface samples of the northeastern Sichuan Basin yield apparent ages range between 60 similar to 80 Ma, which as is often the case, cannot be linked directly to any obvious geological events. Thermal modeling based on those data; however, provide some constraints on the cooling history of the northeastern Sichuan Basin. However, the details of the reconstructed cooling histories reported, vary significantly, especially with regard to the timing of the latest episode of cooling. This variation can be attributed to the lack of geological constraints for modeling purposes and the limited thermal resolution of AFT thermochronology in the lower temperature range (< similar to 60 degrees C). To address these issues, we have acquired new borehole AFT and apatite (U-Th)/He (AHe) data, which when combined with previously reported AFT surface and borehole data, allows synthetic AFT and AHe age and AFT length profiles for the basin to be constructed, and improves thermal history modeling to be carried out. This strategy includes, forward modeling based on candidate thermal histories to obtain predicted low-temperature thermochronology profiles and achieving a good match between the predicted and observed results. Using this strategy, we tested three possible cooling histories for the northeastern Sichuan Basin: linear cooling since 100 Ma, enhanced cooling since 40 Ma following slow cooling since 100 Ma and enhanced cooling since 30 Ma following slow cooling since 100 Ma. Results suggest that the most likely post-Early Cretaceous cooling history for the basin is - cooling at a rate of similar to 0. 57 degrees C/Ma between similar to 100 and 30 Ma, followed by a rate of similar to 1. 67 degrees C/Ma since similar to 30 Ma. Assuming that cooling resulted from denudation (as suggested from previous work) and occurred under a constant paleothermal gradient of similar to 20 degrees C/km (similar to that of the present day), the denudation history of the basin is calculated - denudation at rate of similar to 29 m/Ma between similar to 100 Ma and similar to 30Ma and at similar to 83 m/Ma since similar to 30 Ma. The total post Early Cretaceous denudation for the northeastern Sichuan Basin is estimated at similar to 5 km. |
| WOS关键词 | FISSION-TRACK THERMOCHRONOLOGY ; PORPHYRY COPPER-DEPOSIT ; APATITE (U-TH)/HE THERMOCHRONOMETRY ; TIBETAN PLATEAU ; THERMAL HISTORY ; HELIUM DIFFUSION ; CONTINENTAL AREA ; EASTERN MARGIN ; CENTRAL CHINA ; HE DIFFUSION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000289041200021 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/74748]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Tian Yun-Tao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China 2.Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, Australia |
| 推荐引用方式 GB/T 7714 | Tian Yun-Tao,Zhu Chuan-Qing,Xu Ming,et al. Post-Early Cretaceous denudation history of the northeastern Sichuan Basin constraints from low-temperature thermochronology profiles[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2011,54(3):807-816. |
| APA | Tian Yun-Tao,Zhu Chuan-Qing,Xu Ming,Rao Song,Kohn, Barry P.,&Hu Sheng-Biao.(2011).Post-Early Cretaceous denudation history of the northeastern Sichuan Basin constraints from low-temperature thermochronology profiles.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,54(3),807-816. |
| MLA | Tian Yun-Tao,et al."Post-Early Cretaceous denudation history of the northeastern Sichuan Basin constraints from low-temperature thermochronology profiles".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 54.3(2011):807-816. |
入库方式： OAI收割
来源：地质与地球物理研究所
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