Volume 92, Issue 2 pp. 536-555
Original Article
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Late Cretaceous-Cenozoic Multi-Stage Denudation at the Western Ordos Block: Constraints by the Apatite Fission Track Dating on the Langshan

Xianyue CUI

Xianyue CUI

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059 China

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Qihua ZHAO

Qihua ZHAO

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059 China

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Jin ZHANG

Corresponding Author

Jin ZHANG

The Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 China

Corresponding author. E-mail: [email protected]Search for more papers by this author
Yannan WANG

Yannan WANG

Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Ürümqi 830011 China

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Beihang ZHANG

Beihang ZHANG

The Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 China

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Fengjun NIE

Fengjun NIE

Donghua Polytechnic University, Nanchang 330013 China

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Junfeng QU

Junfeng QU

The Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 China

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Heng ZHAO

Heng ZHAO

The Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 China

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First published: 27 April 2018
Citations: 18

About the first author:

CUI Xianyue, born in 1973; Ph. D. student of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology; Senior engineer of De Yi Cheng Li Environmental Engineering and Technology Limited Liability Company of Beijing China. He is mainly engaged in the study of the influence of new tectonic movement on geological environment.

Abstract

The apatite fission track dating of samples from the Dabashan (i.e., the Langshan in the northeastern Alxa Block) by the laser ablation method and their thermal history modeling of AFT ages are conducted in this study. The obtained results and lines of geological evidence in the study region indicate that the Langshan has experienced complicated tectonic-thermal events during the the Late Cretaceous-Cenozoic. Firstly, it experienced a tectonic-thermal event in the Late Cretaceous (∼90–70 Ma). The event had little relation with the oblique subduction of the Izanagi Plate along the eastern Eurasian Plate, but was related to the Neo-Tethys subduction and compression between the Lhasa Block and Qiangtang Block. Secondly, it underwent the dextral slip faulting in the Eocene (∼50–45 Ma). The strike slip fault may develop in the same tectonic setting as sinistral slip faults in southern Mongolia and thrusts in West Qinling to the southwest Ordos Block in the same period, which is the remote far-field response to the India-Eurasia collision. Thirdly, the tectonic thermal event existed in the late Cenozoic (since ∼10 Ma), thermal modeling shows that several samples began their denudation from upper region of partial annealing zone (PAZ), and the denudation may have a great relationship with the growth of Qinghai-Tibetan Plateau to the northeast. In addition, the AFT ages of Langshan indicate that the main body of the Langshan may be an upper part of fossil PAZ of the Late Cretaceous (∼70 Ma). The fossil PAZ were destroyed and deformed by tectonic events repeatedly in the Cenozoic along with the denudation.

 

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