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Abstract:
In Late Cenozoic, the long-range effect of Indo-Asia collision may result in strong tectonic deformation and uplift of marginal area in the Qinghai-Tibet Plateau. However, different geologists have very different understanding of the age of the tectonic deformation and uplift in the Qinghai-Tibet Plateau. Hence, there is no consensus to be reached. Based on an integrated research of tectonic deformation, sedimentation, magmatic activity and physiographic response to the fold and thrust belt on the northwestern margin of the Qinghai-Tibet Plateau late Cenozoic, in combination with Paleocene to Miocene strata sedimentation s succession and strata dips coherence, it is suggested that a strong regional tectonic deformation has not taken place in the northwestern margin of the Qinghai-Tibet Plateau at the Paleocene-late Miocene. Unconformity marks such as folds, growth stratum, wedge-top sediment and local unconformity contact in thrust-fold belt indicate an age of Pliocene-early Pleistocene for the strong tectonic deformation in the northwestern margin of the Qinghai-Tibet Plateau. In addition, the strongest deformation took place at the end of Xiyu conglomerate deposition, that is Kunlun-huanghe Movement at about 1.1-0.7 Ma, which finally resulted in overall folding and uplifting of strata before Pleistocene and regionally angular unconformity between Wusu Formation and Xiyu comgloerate. This provides the key structural geological evidence for tectonic deformation of the northwestern margin of the Qinghai-Tibet Plateau in late Cenozoic. Meanwhile, research of apatite fission track suggests that main uplifting of the Qinghai-Tibet Plateau likely resulted from the boundary fault of the Plateau in the form of thrusting extension in Pliocene and Pleistocene. Denudation thickness by fission track modeling indicates that the Xiyu conglomerate should come from slope zone which had suffered landform change, which supports the understanding of the tectonic genesis of the Xiyu conglomerate.
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Acta Geologica Sinica
ISSN: 1000-9515
CN: 11-2001/P
Year: 2010
Issue: 3
Volume: 84
Page: 293-310
1 . 4 0 8
JCR@2010
2 . 1 0 0
JCR@2023
ESI Discipline: GEOSCIENCES;
JCR Journal Grade:2
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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