Constraint of Cretaceous to Paleogene Terrestrial Basins in the Nanling Area on Climate Changes and Tectonic Transition

XU Xian-Bing

doi:10.3969/j.issn.2097-0013.2022.04.001

2022 Vol. 38, No. 4

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XU Xian-Bing. 2022. Constraint of Cretaceous to Paleogene Terrestrial Basins in the Nanling Area on Climate Changes and Tectonic Transition. South China Geology, 38(4): 569-582. doi: 10.3969/j.issn.2097-0013.2022.04.001

Citation:

XU Xian-Bing. 2022. Constraint of Cretaceous to Paleogene Terrestrial Basins in the Nanling Area on Climate Changes and Tectonic Transition. South China Geology, 38(4): 569-582. doi: 10.3969/j.issn.2097-0013.2022.04.001

Constraint of Cretaceous to Paleogene Terrestrial Basins in the Nanling Area on Climate Changes and Tectonic Transition

XU Xian-Bing

School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China

Received Date: 04 July 2022

Revised Date: 19 July 2022

Abstract

Abstract

Cretaceous to Paleogene terrestrial basins in the Nanling area have important constraint on early climate changes and tectonic transition for the South China Block from late Mesozoic to Cenozoic. On the basis of overviews of distribution rules, depositional ages and thickness, provenances and structural features of terrestrial basins, Cretaceous to Paleogene climate changes and tectonic transition were discussed for the South China Block. The Nanling area can be divided into northern, middle and southern parts according to the three E-W Late Jurassic granitic belts. The middle partis mainly characterized by Late Cretaceous to Paleogene basins with varied exposed areas and depositional thickness. Both northern and southern parts can be divided into eastern and western segments by the NNE-striking Chenzhou-Linwu fault. The western segment is featured by bigger Cretaceous to Paleogene basins whereas the eastern segment by Late Cretaceous to Paleogene basins.Thick red beds indicate wet and hot climate conditions in the Nanling area during Cretaceous to Paleogene. During the middle Upper Cretaceous, aridity desert climate documented by aeolian deposits and evaporites occurred as a result of steam isolation by NE-SE striking mountains in the Southeast Coast and E-W striking mountains in the Nanling area. Provenance analysis through detrital zircon U-Pb ages imply that the lowest Upper Cretaceous and Paleocene in the Nanxiong Basin were derived mainly from peripheral bedrocks whereas Cretaceous to Paleogene basins in both the southern and northern parts from the middle part and its peripheral bedrocks. The disparity indicates that the Nanling area underwent three stages of extension throughout Early Cretaceous, Late Cretaceous and Paleocene. Migration of the Early and Late Cretaceous basins and two stages of NW-SE extension indicate the retreat, foundering and steepening of the Paleo-Pacific Plate during Cretaceous from west to east. The extension shift of Cretaceous and Paleogene from NW-SE to NE-SW imply that tectonic transition from the Paleo-Pacific to Neo-Tethys regimes occurred in the interior South China at the boundary of the Cretaceous and Paleogene.
- Cretaceous to Paleogene basins /
- climate changes /
- tectonic transition /
- the Nanling area /
- South China Block

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