Affiliation:
1. 1 Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China cas.cn
2. 2 Redrock Mining. Co. Ltd. Hami 839000 China
3. 3 Innovation Academy for Earth Science CAS Beijing 100029 China cas.cn
4. 4 College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing 100049 China ucas.ac.cn
5. 5 State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China cas.cn
Abstract
AbstractThe Permian–Triassic tectonic setting is still controversial in the southern Altaids. The Beishan orogen is an ideal region to address the final tectonic of the Altaids. These systematic mapping, geochemistry, and geochronology studies on the Houhongquan ophiolitic mélange in the south Beishan are conducted to address this issue. New mapping reveals that the Houhongquan ophiolitic mélange consists of blocks of gabbro, basalt, chert, granite, and strongly deformed and cleaved sandstone in the southern Beishan. The studies reveal that the mafic fragments are relics of normal-mid-ocean ridge (N-MOR) and suprasubduction zone (SSZ) types of oceanic lithosphere. The four sandstone matrix samples yield the maximum depositional ages of 222±5 Ma, 233.8±2.3 Ma, 263.4±2.5 Ma, and 263.5±2.8 Ma, respectively, indicating that the youngest sandstones were tectonic emplaced in the Houhongquan ophiolitic mélange after ca. 222 Ma. The sandstone matrices display two types of age spectra. Early Permian sandstones have a single Devonian to Early Permian peak age patterns, indicating the existence of an independent Permian intraoceanic arc. In contrast, Late Triassic sandstones have multiple peaks with some Precambrian zircons, suggesting that they were sourced from a continental arc. Accordingly, we consider that the Houhongquan ophiolitic mélange tectonic was emplaced in the intraoceanic island arc during the Middle Permian and docked to a continental margin arc during the Late Triassic. Thus, we argue that the terminal amalgamation timing of the southern Altaids was probably during ca. 222-217 Ma.
Funder
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Science and Technology Major Project of Xinjiang Uygur Autonomous Region
Chinese Academy of Sciences
National Natural Science Foundation of China
Third Xinjiang Scientific Expedition Program
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