Journal
ACTA GEOLOGICA SINICA-ENGLISH EDITION
Volume 93, Issue 6, Pages 1835-1849Publisher
WILEY
DOI: 10.1111/1755-6724.13863
Keywords
western Ordos Basin; upper Triassic; geochemistry; petrography; provenance analysis; proto-boundary
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Funding
- National Natural Science Foundation of China [41802119, 41602212]
- Natural Science Foundation of Shaanxi [2019JQ-088]
- Special Projects of China Geological Survey [12120113039900, 12120114009201]
- Doctor's fund of Xi'an University of Science and Technology [2017QDJ051]
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Petrographic and geochemical characteristics of the Upper Triassic sandstones in the western Ordos Basin were studied to provide insight into weathering characteristics, provenance, and tectonic implications. Petrographic features show that the sandstones are characterized by low-medium compositional maturity and textural maturity. The CIA and CIW values reveal weak and moderate weathering history in the source area. The geochemical characteristics together with palaeocurrent data show that the northwestern sediments were mainly derived from the Alxa Block with a typical recycled nature, while the provenance of the western and southwestern sediments were mainly from the Qinling-Qilian Orogenic Belt. The tectonic setting discrimination diagrams signify that the parent rocks of sandstones in the western and southern Ordos Basin were mainly developed from continental island arc, which is closely related to the evolution of the Qinling-Qilian Orogenic Belt. However, the sandstones in the northwestern Ordos Basin show complex features, which may be resulted from a typical recycling process. Overall evidence from petrography, geochemistry and sedimentology, together with previous researches suggest the Kongtongshan and Helanshan areas were the southwestern and northwestern boundary of the Ordos Basin, respectively, and there was no clear boundary between the Hexi Corridor Belt and Ordos Basin, where a large, uniform sediment dispersal system developed during the Late Triassic.
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