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学科主题: 地球科学::地质学
题名: Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet
作者: Fan, SY (Fan, Suoya)1, 2; Ding, L (Ding, Lin)1; Murphy, MA (Murphy, Michael A.)2; Yao, W (Yao, Wei)1; Yin, A (Yin, An)3
通讯作者: Fan, SY
关键词: ZIRCON U-PB ; BANGONG-NUJIANG OCEAN ; INDO-ASIAN COLLISION ; RETROARC FORELAND BASIN ; NEO-TETHYS OCEAN ; VOLCANIC-ROCKS ; TECTONIC IMPLICATIONS ; NORTHERN TIBET ; SUTURE ZONE ; CRUSTAL GROWTH
刊名: TECTONOPHYSICS
发表日期: 2017
DOI: 10.1016/j.tecto.2017.10.022
卷: 721, 期:0, 页:415-434
收录类别: SCI
合作性质: 国际
文章类型: Article
类目[WOS]: Geochemistry & Geophysics ; Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
英文摘要: Models for the Mesozoic growth of the Tibetan plateau describe closure of the Bangong Ocean resulting in accretion of the Lhasa terrane to the Qiangtang terrane along the Bangong-Nuijiang suture zone (BNSZ). However, a more complex history is suggested by studies of ophiolitic melanges south of the BNSZ "within" the Lhasa terrane. One such melange belt is the Shiquanhe-Namu Co melange zone (SNMZ) that is coincident with the Geren Co-Namu Co thrust (GNT). To better understand the structure, age, and provenance of rocks exposed along the SNMZ we conducted geologic mapping, sandstone petrography, and U-Pb zircon geochronology of rocks straddling the SNMZ. The GNT is north-directed and places Paleozoic strata against the Yongzhu ophiolite and Cretaceous strata along strike. A gabbro in the Yongzhu ophiolite yielded a U-Pb zircon age of 153 Ma. Detrital zircon age data from Permian rocks in the hanging wall suggests that the Lhasa terrane has affinity with the Himalaya and Qiangtang, rather than northwest Australia. The Late Jurassic-Early Cretaceous Rila Formation overlies the ophiolite and shows signatures of syntectonic deposition. Detrital zircon ages from the Cretaceous Duoni Formation in the footwall of the GNT suggest that the provenance is mainly Early Cretaceous igneous rocks in the northern Lhasa terrane and Paleozoic strata in the hanging wall of the GNT. Our results support the interpretation that the SNMZ is a Late Jurassic-Early Cretaceous suture zone that resulted from closure of a small Jurassic ocean basin, thereby suggesting more Jurassic shortening than conventional models. The GNT developed along the SNMZ in the Early Cretaceous and facilitated exhumation of Paleozoic strata, which became a source for Cretaceous basins along the GNT. Early Cretaceous igneous rocks in northern Lhasa are interpreted to be a consequence of subduction of ocean lithosphere along the SNMZ and its later delamination.
语种: 英语
WOS记录号: WOS:000418309400028
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7939
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
2.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA.
3.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA.

Recommended Citation:
Fan, SY ,Ding, L ,Murphy, MA ,et al. Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet[J]. TECTONOPHYSICS,2017,721(0):415-434.
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