| 湘东南地区中、新生代山体隆升过程的热年代学研究 |
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| 关键词:thermochronology tectonic uplift Meso-Cenozoic southeast Hunan |
| 基金项目:中国地质调查局地质大调查项目(编号:200213000035) |
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| Meso-Cenozoic Thermochronological Analysis of the Uplift Process of Mountains in Southeast Hunan |
| Southeast Hunan lies on the margin of central Naning Mountains. Thermochronological dating was used to study the Meso-Cenozoic thermal history and the uplift processes of five plutons in southeast Hunan. Based on regional tectonic settings, the authors probed into the relationship between the thermochronological evolution and the tectonic development. The results show that the Meso-Cenozoic uplift process of southeast Hunan can be divided into 4 stages, developing in order of fairly rapid uplift→rapid uplift→slow uplift→rapid uplift, with the fairly rapid uplift process at an average rate of 0.069mm/a during 222～146.4Ma, the rapid uplift process at an average rate of 0.113～0.186mm/a during 146.4～94.11Ma, the slow uplift process at an average rate of 0.014～0.028 mm/a during 94.11～14.8Ma, and the rapid uplift process at an average rate of 0.143～0.295mm/a during 14.8Ma～0.0Ma. The uplift rate speeded up at the latest stage. The uplift processes were not uniform in space, and different plutons had somewhat different uplift processes. There existed commutative uplift reparation in time, i.e., the more rapid uplift and the larger uplift range the pluton at the early stage was, the slower uplift and the smaller uplift range the pluton at the late stage became. Based on thermochronologic analysis and regional tectonic setting as well as other geological data, the authors consider that the lower crust of Wufengxian, Dayishan and Qitianling areas was thickened by 4100～7700m as a result of tectonic stacking in late Middle Triassic, suggesting that there existed violent intracontinental orogeny at the early stage of the Indosinian movement. The Late Yanshanian uplift and the cooling of the plutons were caused by early tectonic denudation and late weathering erosion, which led to the good deposition response in basins. The latest rapid uplift in southeast Hunan was a regional integral uplift. |
| BAI Dao-yuan,HUANG Jian-zhong,MENG De-bao,MA Tie-qiu,WANG Xian-hui,ZHANG Xiao-yang,CHEN Bi-he.2006.Meso-Cenozoic Thermochronological Analysis of the Uplift Process of Mountains in Southeast Hunan[J].Acta Geoscientica Sinica,27(6):525-536. |
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