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学科主题: Geology
题名: Thermochronological analyses on the cooling history of the Lincang granitoid bathotith, Western Yunnan
作者: Shi, XB ; Qiu, XL ; Liu, HL ; Chu, ZY ; Xia, B
通讯作者: xhshi@scsio.ac.cn
关键词: Yunnan ; Linchang Granitoid Batholith ; closure temperature ; mylonite ; geochronology ; fission track
刊名: ACTA PETROLOGICA SINICA
发表日期: 2006
卷: 22, 期:2, 页:465-479
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Seas, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Marginal Seas, Guangzhou 510301, Peoples R China
项目归属: 海洋地质
摘要: Multi-system geochronology, including zircon U-Pb dating, biotite Rb-Sr isochron dating, biotite and K-feldspar Ar-40/Ar-39 dating, zircon and apatite fission track data, was used to Unravel the cooling histories of 6 granite samples from the Lincang Granitioid Batholith with thermochronology technique. Analyses shows that, the main part of the batholith has undergone a complex thermal history since its intrusion, and short term thermal events were overprinted on the basic cooling history which consists of the early quick cooling stage and the later slow cooling stage. During the Middle and Late Triassic, and the end of the Early Jurassic, the average cooling rate is up to 6 degrees C similar to 13 degrees C/Ma, which was followed by a slow cooling stage of the Middle Jurassic. During the Late Jurassic and the early stage of the Early Cretaceous, there was a quick cooling stage with an average rate of 5 degrees C/Ma, which was followed by a slow cooling stage with a cooling rate of about 0.5C/Ma, from the late stage of the Early Cretaceous to the beginning of the continent-continent collision of India plate and Asia plate which happens at the Late Eocene. Since the collision, the batholith has undergone two cooling stages, the cooling rate of the early stage is about 5 degrees C similar to 10 degrees C/Ma,while the cooling rate of the later stage is far larger than the early one, especially the rate since 3 Ma is up to 16 degrees C similar to 20 degrees C/Ma; The intrusion, happened in the Early Cretaceous (for example, Sample S57), which cooled quickly immediately after intrusion, cooled slowly together with the main part of the batholith since the Late Cretaceous; The mylonite zone, lying oil the eastern side of the batholith, was generated much earlier than its biotite Ar-40/Ar-39 age, 150Ma, and maybe was generated during the thrust and nappe stage due to the collision between the Baoshan Block and the Lanping-Simao Block. Since the Late Cretaceous, the denudation is about 5000m, and 3500m of which is the result of the collision of the India plate and the Asia plate.
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WOS记录号: WOS:000236152700019
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4426
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Shi, XB; Qiu, XL; Liu, HL; Chu, ZY; Xia, B.Thermochronological analyses on the cooling history of the Lincang granitoid bathotith, Western Yunnan,ACTA PETROLOGICA SINICA,2006,22(2):465-479
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