首页|Formation Mechanism of the Paleocene Basal Conglomerate,Southwest Tarim Basin
Formation Mechanism of the Paleocene Basal Conglomerate,Southwest Tarim Basin
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Most knowledge about the Cretaceous-Paleogene strata in the Tarim Basin is mainly in-ferred from the outcrops at the basin's margin,but first time in the basin.The formation mechanism of the Paleocene basal conglomerate was determined using geochemical isotopes of the breccia from Well PBX1 in the southwestern Tarim Basin.The results showed that the global K/Pg(i.e.,Cretaceous/Paleogene)clay layer boundary was located in the middle of the Paleocene basal conglomerate at the depth of 7 066.75 m in Well PBX1.In the Late Cretaceous,associated with volcanic activities and earth-quakes,the caldera in the Well PBX1 Block formed an annular depression with large elevation differ-ences in response to the Pamir Block collision.As a result,the collapsed breccia with storm tide genesis deposited at the periphery and inside of the depression,characterized by syn-sedimentary deformation.During the Paleocene,multiple sets of interbedded carbonate and collapsed breccia deposited in re-sponse to multi-phased transient transgression-regression cycles.The transportation of breccia exhibit-ed near-source accumulation/extremely close or in-situ rapid accumulation.The studied region is locat-ed in the eastern end of the Tethys Sea,the Late Cretaceous-Early Paleocene breccia is of great signifi-cance for reconstructing the paleogeography of the Tarim basin in Tethys.
South-Western TarimPaleogene systemBrecciaAttribution and genesispetroleum geology
Yong Yue、Jingchun Tian、Chuanyan Huang
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Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China
Shanghai Branch of CNOOC Ltd.,Shanghai 200335,China
Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China
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