期刊
INTERNATIONAL GEOLOGY REVIEW
卷 62, 期 18, 页码 2300-2323出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00206814.2019.1697859
关键词
Tibetan Plateau; Bangong-Nujiang Suture Zone; geochronology; fold-thrust belt; continental collision
类别
资金
- Large scale mapping in the Qiantang-Lhasa ophiolite tectonic melange belt [DD20190167]
- 1:50,000 regional geological surveys in the Rong Ma Xiang south areas of Tibet [121201103000150004]
- Regional Geological Survey [KD-[2018]-XZ-035]
- Ministry of Land and Resources of China [201511022]
- basic project of the CAGS [JYYWF201810]
- National Natural Science Foundation of China [41672211]
The Bangong-Nujiang Suture Zone (BNSZ), located in the central Tibetan Plateau, experienced a Late Mesozoic transition from oceanic closure to continent-continent collision. Based on sandstone-composition analyses, U-Pb detrital-zircon dating and structural observations, we determined that this transition occurred coeval with the accretion of the Lhasa Terrane to Eurasia. According to our newly observed stratigraphic and geochronological data, we conclude the following: (1) the Upper Triassic-Lower Jurassic Muggar Gangri Group was mainly derived from the Qiangtang Terrane; (2) the Shamuluo Formation composed of Upper Jurassic-Lower Cretaceous shallow marine strata was sourced from both the Qiangtang Terrane and recycled Muggar Gangri Group; (3) the Lower Cretaceous (similar to 125-110 Ma) Duoni Formation shows both Lhasa and Qiangtang detrital zircon fingerprints, indicating closure of the Bangong-Nujiang Ocean at similar to 120 Ma; and (4) the Upper Cretaceous Abushan Formation is a suite of intramontane molasse deposited after the Qiangtang-Lhasa collision. Therefore, these sedimentary strata record the transition from oceanic closure to continent-continent collision from 125 to 90 Ma within the central BNSZ. Moreover, based on relationships among strata distributions and thrust locations, we propose that thrust movements propagated southward during this transition and controlled sedimentary basin deposition. The Late Mesozoic tectonic transition within the BNSZ occurred well before the India-Asia collision and hence profoundly influenced the Cenozoic formation of the Tibetan Plateau.
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