Abstract
Due to the unknown Triassic volcanism in the Junggar Basin, the Middle–Late Triassic sedimentary provenance in the southern Junggar Basin (SJB) has long been controversial. Detrital zircon grains from 13 samples of the Middle–Upper Triassic Xiaoquangou Group in the SJB were analyzed using zircon U–Pb geochronology to constrain the provenance of Triassic sedimentary rocks and to further understand their source-to-sink system. Comparison of detrital zircon U–Pb age distributions for 13 samples reveals that the Triassic age populations predominate in sediments of the northern Bogda Mountains, with subordinate in the southern Bogda Mountains, and no or minimal in the North Tianshan (NTS). Coupled with sandstone petrological, sedimentary geochemical and paleocurrent data, the Triassic detrital zircon grains of the Xiaoquangou Group in the SJB were probably input from the Bogda Mountains. As Pennsylvanian and Mississippian zircon grains are mainly derived from the NTS and Central Tianshan (CTS), the provenance of the Xiaoquangou Group includes the NTS, CTS and Bogda Mountains. But the different samples in different sink areas have different provenances, originating from at least four source-to-sink systems. The supply of sediments from the Bogda Mountains started in the Late Triassic, suggesting initial uplift of the Bogda Mountains.
Highlights
Due to the unknown Triassic volcanism in the Junggar Basin, the Middle–Late Triassic sedimentary provenance in the southern Junggar Basin (SJB) has long been controversial
Detrital zircon U–Pb ages for thirteen samples (12SKS-07, 17JGMK-06, XJ12-06, 17HJG-01, 15HXG-95, 17JJZG-10, 17BYH-61, 16DLK-49, 17DDLK-09, 16TDG-06, 16DBC-04, HX-01, and 15C-33) from various sections are given in Supplementary Information
Based on the comparison of the detrital zircon U–Pb age distribution to the reported crystallization ages of intermediate–acidic igneous rocks from the North Tianshan (NTS), Central Tianshan (CTS), and Bogda Mountains, the Cambrian–Devonian and Mississippian age group zircon grains are derived from the CTS, and the Pennsylvanian age group zircon grains are likely sourced from the NTS16,17 (Fig. 5)
Summary
Due to the unknown Triassic volcanism in the Junggar Basin, the Middle–Late Triassic sedimentary provenance in the southern Junggar Basin (SJB) has long been controversial. These Triassic detrital zircon grains, have been interpreted as derivations from the Jiumusaer area of the Bogda M ountains[25], Harlik M ountains[24], and Altai M ountains[26] without robust evidence In this contribution, thirteen samples from twelve sections and one well (the Sikeshu, Jiangongmeikuang, and Aiweiergou sections in front of the NTS or western part of the SJB, the Haojiagou, Jingjingzigou, Haxionggou, Baiyanghe, Xidalongkou, and Dongdalongkou sections in the northern Bogda Mountains, the Dabancheng and Yuergou sections, and well C in the southern Bogda Mountains) distributed within the Middle–Upper Triassic Xiaoquangou Group were collected for detrital zircon U–Pb analysis.
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