塔里木盆地中央隆起带：新元古代造山型基底拼合带——来自深钻孔的碎屑记录证据

doi:10.11743/ogg20180604

Abstract

Abstract: Three deep holes(Well TX1,XH1 and BT5)encountered clastic sedimentary rocks underlying the Cambrian carbonates in the Bachu uplift of the Tarim Basin.After detailed study of these clastic rocks through petrographic observations,clastic composition statistics and geo-chemical analyses,their provenances and the tectonic setting for their formation were discussed in depth.The clastic compositions of conglomerates and sandstones together with the geochemical characteristics of mudstones indicate that the provenances of the clastic sedimentary rocks underlying the Cambrian carbonates in the three wells include sedimentary rocks,igneous rocks,metamorphic rocks,among which the intermediate-acidic volcanic rocks and intrusive rocks are predominant.The angular-to-sub-rounded appearance of the clastic particles in the conglomerates and sandstones,the presence of erodible compositions in gravels(such as carbonates,schists)and the lower Th/U ratio of mudstones collectively show that these clastic rocks are near-source deposits with low maturity.By comparing the clastic composition,geochemical characteristics,and age structure of detrital zircons,we could determine that the detrital components of these clastic rocks are mainly derived from the underlying basement.The detrital models of conglomerates and sandstones,geochemical characteristics of mudstones and in-situ trace element characteristics of detrital zircons suggest that the source area,that is the underlying basement,was located in an arc-related tectonic setting on the active continental margin in the Neoproterozoic(peak: 790-730 Ma).The newly obtained evidences of clastic rocks are well consistent with the previous studies on the age and tectonic setting of the andesites and dacites at the bottom of Well Tong-1 and the granodiorites and diorites at the bottom of Well Tashen-1 in the Katake uplift,demonstrating that the central uplift zone(Bachu uplift-Katake uplift-Guchengxu uplift)across the central Tarim Basin is a Neoproterozoic continental marginal arc,while the basement of the Tarim Basin is the result of amalgamation caused by Neoproterozoic orogeny.

Key words: detrital composition, geochemistry, provenance, basement of amalgamation origin, central uplift zone, Ta-rim Basin

CLC Number:

TE121.2

Li Xiaojian, Wang Yi, Li Huili, Gao Shanlin, Zhang Zhongpei, Yue Yong, Yan Quanren, Jiang Wen. Central uplift of Tarim Basin being the Neoproterozoic basement structure zone of orogeny origin:Evidences from clastic samples of deep holes[J]. Oil & Gas Geology, 2018, 39(6): 1131-1145.

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Central uplift of Tarim Basin being the Neoproterozoic basement structure zone of orogeny origin:Evidences from clastic samples of deep holes

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