Mesozoic Tectonics and Dynamic Thermal History in Yuanba Area of Northeastern Sichuan Basin
详细信息
- 责任者：Wang Jie (Key Laboratory of Petroleum Accumulation Mechanisms ; SINOPEC ; Wuxi 214151 ; China) ; Qin Jianzhong
- 刊名：Petroleum Geology & Experiment
- 出版年：2012
- 卷期：34(1)
- 关键词：构造热事件 ; tectonic thermal event ; 同位素地质年代学 ; isotopic geochronology ; 四川 ; Sichuan Province
- 页码：p.19-24
- 图表：4 illus., 1 table, 25 refs.
- 分类号：1300
- 出版序号：20130408
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
In Yuanba area of the northeastern Sichuan Basin,vitrinite reflectance and (U-Th)/He dating analyses of apatite and zircon in chip samples from the Xujiahe (T3x)-Jiading (K1j) formations were carried out. From Paleogene to Neogene (0.2～36.4 Ma), the Mesozoic strata in Yuanba area went through a severe cooling uplift and denudation with the denudation rate of 109.9 m/Ma. In K1j and the overlying strata, the maximum denudation thickness was about 4 000 m. The dynamic thermal evolution history in the study area was illustrated systematically as followed. In Mesozoic, the maximum palaeogeothermal of strata was 170～190 ℃. As strata upraise, palaeogeothermal decreased. From 36 to 176 Ma, palaeogeothermal was 95～170 ℃. From 0 to 36 Ma, the present geotemperature is below 95 ℃.
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