期刊
GONDWANA RESEARCH
卷 25, 期 4, 页码 1680-1689出版社
ELSEVIER
DOI: 10.1016/j.gr.2013.06.019
关键词
Provenance; Late Triassic; Lhasa terrane; Chronology; Hf isotopes
资金
- Geological Survey of China [1212010818094]
- Australia research council DECRA (Discovery Early Career Research Award) [DE120102245]
- Australian Research Council [DE120102245] Funding Source: Australian Research Council
In southern Tibet, Late Triassic sequences are especially important to understanding the assembly of the Lhasa terrane prior to Indo-Asian collision. We report new data relevant to the provenance of a Late Triassic clastic sequence from the Mailonggang Formation in the central Lhasa terrane, Tibet. Petrographic studies and detrital heavy mineral assemblages indicate a proximal orogenic provenance, including volcanic, sedimentary and some ultramafic and metamorphic rocks. In situ detrital zircon Hf and U-Pb isotope data are consistent with derivation of these rocks from nearby Triassic magmatic rocks and basement that comprise part of the newly recognized Late Permian-Triassic Sumdo-Cuogen orogenic belt. The new data suggests correlation with the Upper Triassic Langjiexue Group which lies on the opposing (southern) side of Indus-Yarlung ophiolite. Sediments from both the Mailonggang Formation and Langjiexue Group are interpreted to represent formerly contiguous parts of a sequence deposited on the southern flanks of the Sumdo-Cuoqen belt. Crown Copyright (C) 2013 Published by Elsevier B.V. on behalf of International Association for Gondwana Research. All rights reserved.
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