The Late Cretaceous palaeocurrents in the Chishui region, Guizhou and their tectonic significance

CAO Rui; YAN Zhaokun; WANG Zhiyong; QIANG Kun; CHEN Xiufeng

Sedimentary Geology and Tethyan Geology > 2019 > 39(2): 78-83.

CAO Rui, YAN Zhaokun, WANG Zhiyong, QIANG Kun, CHEN Xiufeng. The Late Cretaceous palaeocurrents in the Chishui region, Guizhou and their tectonic significance[J]. Sedimentary Geology and Tethyan Geology, 2019, 39(2): 78-83.

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The Late Cretaceous palaeocurrents in the Chishui region, Guizhou and their tectonic significance

1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. State Key Laboratory of Nuclear Resources and Environments, East China University of Technology, Nanchang 330013, Jiangxi, China;
3. Danxia National Geopark Administration, Chishui 564700, Guizhou, China

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Received Date: February 28, 2019
Revised Date: April 11, 2019
Published Date: June 29, 2019

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Abstract

A succession of 1300-m thick continental strata was deposited during the Late Cretaceous in the Chishui region, Guizhou on the southwestern margin of the Sichuan Basin. In this paper, the Late Cretaceous sediments filling processes and tectonic significance are explored on the basis of field observation and indoor analysis of the palaeocurrents indicated by the surface outcrops in the Chishui region. The palaeocurrents in the braided streams were directed from northeast to southwest during the Late Cretaceous, indicating that the sediments detritus in the Chishui region may come mainly from the northern and eastern parts of the Basin. Judged from the provenance, stratigraphic distribution and regional geological background, it is inferred that the Late Cretaceous continental sedimentary basin in the Chishui region may belong to the intracontinental foreland basin, and the intracontinental orogenic zones appear in the eastern part of the Basin as a major provenance. The formation of the Late Cretaceous intracontinental foreland basin in the Chishui region may be governed by the intracontinental orogeny caused by the tectonic compression events in South China during the Late Cretaceous, and thus the Sichuan Basin has gone through the evolution from a fresh lake to a saline lake.
- Chishui in Guizhou,
- Late Cretaceous,
- tectonic significance,
- Sichuan Basin,
- palaeocurrents

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