The Tectonothermal Events, Architecture and Evolution of Tarim Craton Basement Palaeo-uplifts
详细信息
- 责任者：Wu GuangHui(PetroChina Research Institute of Petroleum Exploration and Development ; Beijing 100083 ; China) ; Li HaoWu
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(8)
- 关键词：基底构造 ; basement tectonics ; 构造热事件 ; tectonic thermal event ; 塔里木盆地 ; Tarim Basin
- 页码：p.2435-2452
- 图表：illus.,4 tables,82 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Based on the U-Pb zircon dating analysis within Tarim basin, it is indicated that there were 9 stages of tectonothermal events of the Precambrian basement with the peak age of 2950~3100Ma, 2100~2400Ma, 1900~2000Ma, 1300~1600Ma, 900~950Ma, 700~800Ma, 540~560Ma, 400~500Ma and 270~290Ma. The SHRIMP U-Pb zircon dating of the central aeromagnetic anomaly zone yields the age of 1908.2±8.6Ma, which revealed that there was granitoid basement by Palaeoproterozoic tectonothermal event. By the dating data with new geology and geophysics data, there are different age and type of Precambrian crystalline basements in Tarim basin,which divided into the northern basement with Meso-Neoproterozoic low-to medium-grade metamorphic rocks, the middle basement of Palaeoproterozoic granite, the southern basement with Early-Middle Neoproterozoic magmatite and metamorphite, the southeastern metamorphite basement undergone reformation in Early Silurian epimetamorphism. It is found that there is a wide range unconformity between Cambrian and Precambrian by well and seismic date,which developed the northern and southern basement palaeo-uplifts as the result of the potential influence of Pan-African orogenic occurred about 550Ma. The basement palaeo-uplifts undergone 5 stages evolution: the cratonization miniature basement in Archean-Middle Palaeoproterozoic,the united metamorphic crystalline basement in Early Neoproterozoic,the two basement palaeo-uplifts formative stage before Precambrian,the five basement palaeo-uplifts complete period in the late of Caledonian and local regulation since Hercynian.
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