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Clockwise rotations recorded in redbeds from the Jinggu Basin of northwestern Indochina

2017; Geological Society of America; Linguagem: Inglês

10.1130/b31637.1

1943-2674

Shihu Li, Zhenyu Yang, Chenglong Deng, Huaiyu He, Huafeng Qin, Lu Sun, Jie Yuan, Douwe J.J. van Hinsbergen, Wout Krijgsman, Mark J. Dekkers, Yongxin Pan, Rixiang Zhu,

Geological and Geochemical Analysis

Research Article| May 11, 2017 Clockwise rotations recorded in redbeds from the Jinggu Basin of northwestern Indochina Shihu Li; Shihu Li † 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China †lsh917@mail.iggcas.ac.cn Search for other works by this author on: GSW Google Scholar Zhenyu Yang; Zhenyu Yang 2College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China Search for other works by this author on: GSW Google Scholar Chenglong Deng; Chenglong Deng 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Huaiyu He; Huaiyu He 3CAS Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS), Beijing 100029, China Search for other works by this author on: GSW Google Scholar Huafeng Qin; Huafeng Qin 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Lu Sun; Lu Sun 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Jie Yuan; Jie Yuan 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China4University of Chinese Academy of Sciences, Beijing 100049, China Search for other works by this author on: GSW Google Scholar Douwe J.J. van Hinsbergen; Douwe J.J. van Hinsbergen 5Department of Earth Sciences, University of Utrecht, 3584 CD Utrecht, The Netherlands Search for other works by this author on: GSW Google Scholar Wout Krijgsman; Wout Krijgsman 6Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD, Utrecht, The Netherlands Search for other works by this author on: GSW Google Scholar Mark J. Dekkers; Mark J. Dekkers 6Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD, Utrecht, The Netherlands Search for other works by this author on: GSW Google Scholar Yongxin Pan; Yongxin Pan 3CAS Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS), Beijing 100029, China Search for other works by this author on: GSW Google Scholar Rixiang Zhu Rixiang Zhu 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Author and Article Information Shihu Li † 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Zhenyu Yang 2College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China Chenglong Deng 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Huaiyu He 3CAS Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS), Beijing 100029, China Huafeng Qin 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Lu Sun 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Jie Yuan 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China4University of Chinese Academy of Sciences, Beijing 100049, China Douwe J.J. van Hinsbergen 5Department of Earth Sciences, University of Utrecht, 3584 CD Utrecht, The Netherlands Wout Krijgsman 6Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD, Utrecht, The Netherlands Mark J. Dekkers 6Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD, Utrecht, The Netherlands Yongxin Pan 3CAS Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS), Beijing 100029, China Rixiang Zhu 1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China †lsh917@mail.iggcas.ac.cn Publisher: Geological Society of America Received: 23 Aug 2016 Revision Received: 11 Feb 2017 Accepted: 20 Mar 2017 First Online: 23 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2017) 129 (9-10): 1100–1122. https://doi.org/10.1130/B31637.1 Article history Received: 23 Aug 2016 Revision Received: 11 Feb 2017 Accepted: 20 Mar 2017 First Online: 23 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Shihu Li, Zhenyu Yang, Chenglong Deng, Huaiyu He, Huafeng Qin, Lu Sun, Jie Yuan, Douwe J.J. van Hinsbergen, Wout Krijgsman, Mark J. Dekkers, Yongxin Pan, Rixiang Zhu; Clockwise rotations recorded in redbeds from the Jinggu Basin of northwestern Indochina. GSA Bulletin 2017;; 129 (9-10): 1100–1122. doi: https://doi.org/10.1130/B31637.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Paleomagnetic data have been used to infer clockwise rotations and significant southward motion of the Indochina block during Cenozoic extrusion from the India-Asia collision zone. Because the Cenozoic of the Indochina block has been sparsely sampled to date and is key to determining the timing of this tectonic motion, we performed an extensive paleomagnetic study on Paleocene to Oligocene redbeds and middle Miocene sandy silts from the Jinggu Basin (23.5°N, 100.7°E), in northern Indochina. Paleomagnetic results from the redbeds pass fold tests, but they show exclusively normal polarity. There is controversy, however, on the age assignment to the lower part of the succession. If the age of the redbeds is indeed Paleogene, this indicates a prefolding remagnetization associated with Oligocene deformation of the Indochina block. If the age of the redbeds would be Late Cretaceous, their magnetization may be primary, and deposition could have taken place during the Cretaceous normal superchron. However, the abundance of secondary hematite in the redbeds in combination with the biostratigraphy, which indicates a Paleogene age for at least the upper two formations of the redbeds in the Jinggu Basin, implies a pervasive remagnetization. The middle Miocene sediments pass both the fold test and the reversals test and contain magnetite as well as hematite as carriers, suggesting a primary magnetization. Our large data set from the redbeds (>2000 paleomagnetic directions) demonstrates an ∼30°–35° clockwise rotation of the Jinggu Basin with respect to Eurasia, for both scenarios, i.e., when compared to a ca. 100 Ma pole (if the redbeds carry a primary natural remanent magnetization) or to a ca. 30 Ma pole (if the sequence is remagnetized). The middle Miocene results, however, indicate that the Jinggu Basin experienced no significant (2° ± 5.6°) rotation with respect to Eurasia. Since no major deformation has occurred within northern Indochina during Late Cretaceous to Eocene times, our results reflect a major clockwise rotation of the Indochina block during its Oligocene to early Miocene extrusion from the India-Asia collision zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.