Journal
TECTONOPHYSICS
Volume 658, Issue -, Pages 46-60Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2015.07.007
Keywords
Eocene; Oligocene; Paleomagnetism; Chuan Dian Fragment
Categories
Funding
- National Natural Science Foundation of China [41202162]
- China Geological Survey [1212011120164, 12120114002301]
- Fundamental Research Funds for the Chinese Academy of Geological Sciences [YWF201413]
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Paleomagnetic studies were conducted on the Eocene and Oligocene strata at the western part of the Chuan Dian Fragment in order to describe the crustal deformation induced by continuous penetration of the Indian plate into Eurasia during the late Cenozoic. High-temperature magnetic components with unblocking temperatures of similar to 680 degrees C were isolated, and positive fold and/or reversal tests reveal the primary nature of the magnetization. The tilt-corrected site-mean directions obtained from the Oligocene and middle-early Eocene strata are, respectively, Ds = 200.9 degrees, Is = 31.3 degrees, k = 52.8, alpha(95) = 7.7 degrees and Ds = 29.7 degrees, Is = 32.0 degrees, k = 44.9, alpha(95) = 5.6 degrees. Comparison of these results with previous paleomagnetic data from the Chuan Dian Fragment shows that the western and central parts of the Chuan Dian Fragment experienced similar to 20 degrees integral clockwise rotation relative to East Asia since the middle Miocene. However, the eastern part of the Chuan Dian Fragment has experienced different rotational deformation relative to East Asia since the Pliocene, because of the intense regional crustal deformation and activity on fault systems. The eastern boundary of the Chum Dian Fragment was bounded by the Yuanmou-Luezhijiang left lateral strike-slip fault prior to the Pliocene, and then substituted by the Xiaojiang left lateral strike-slip fault since the Pliocene, due to the eastwards spreading of the clockwise rotational movement of the Chuan Dian Fragment The evolutionary characteristics of the Ailaoshan-Red River and Xianshuihe-Xiaojiang strike-slip faults were controlled by the difference between the clockwise rotational extrusion velocities of the Chuan Dian Fragment and the Indochina Block. (C) 2015 Elsevier B.V. All rights reserved.
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