气候变化领域集成服务门户(CCPortal): First Paleomagnetic Result From the Early Permian Volcanic Rocks in Northeastern Mongolia: Evolutional Implication for the Paleo-Asian Ocean and the Mongol-Okhotsk Ocean

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DOI	10.1029/2019JB017338
	First Paleomagnetic Result From the Early Permian Volcanic Rocks in Northeastern Mongolia: Evolutional Implication for the Paleo-Asian Ocean and the Mongol-Okhotsk Ocean
	Zhao P.; Appel E.; Xu B.; Sukhbaatar T.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	The Mongolia Block (MOB), which is now sandwiched by the Siberia Craton (SIB) and the North China Craton (NCC), plays an essential role for understanding the late stage evolution of the Paleo-Asian Ocean and the early stage evolution of the Mongol-Okhotsk Ocean. Here, a paleomagnetic study is performed for the first time on the Early Permian volcanic strata in the Bayandun region of northeastern Mongolia and the data are used to uncover the late Paleozoic paleoposition of the MOB and better understand the evolution of both oceans. Zircon U-Pb dating results reveal an emplacement age of 283 ± 3 Ma for the studied volcanic strata. Rock magnetic analyses identify that titanium-poor magnetite is the main magnetic carrier. Characteristic remanent magnetization isolated from seven sites shows consistent reverse polarity, corresponding to the Permo-Carboniferous (Kiaman) Reverse Superchron. Site-mean directions pass fold tests, and an Early Permian paleomagnetic pole is calculated for the MOB at λ/φ = −14.9°N/76.8°E (A95 = 5.7°) with N = 7 sites. Comparison with published Permian paleomagnetic poles from surrounding blocks indicates that (1) the MOB should have welded with the NCC before the Early Permian or was at least very close to it. (2) The welded MOB-NCC was separated from the SIB by the Mongol-Okhotsk Ocean with ~30° latitudinal difference during the Early Permian. (3) Significant vertical-axis strike-slip related rotations occurred within and along the margins of the unified MOB-NCC due to the far-field stress effect produced by posterior orogenic events. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Early Permian; Mongol-Okhotsk Ocean; northeastern Mongolia; Paleo-Asian Ocean; paleomagnetism; strike-slip
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187997
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, and Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, China; Department of Geosciences, University Tübingen, Tübingen, Germany; Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang, China; Institute of Paleontology and Geology, Mongolian Academy of Science, Ulaanbaatar, Mongolia; Institute of Petrology and Structural Geology, Charles University, Praha 2, Czech Republic
推荐引用方式 GB/T 7714	Zhao P.,Appel E.,Xu B.,et al. First Paleomagnetic Result From the Early Permian Volcanic Rocks in Northeastern Mongolia: Evolutional Implication for the Paleo-Asian Ocean and the Mongol-Okhotsk Ocean[J],2020,125(2).
APA	Zhao P.,Appel E.,Xu B.,&Sukhbaatar T..(2020).First Paleomagnetic Result From the Early Permian Volcanic Rocks in Northeastern Mongolia: Evolutional Implication for the Paleo-Asian Ocean and the Mongol-Okhotsk Ocean.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Zhao P.,et al."First Paleomagnetic Result From the Early Permian Volcanic Rocks in Northeastern Mongolia: Evolutional Implication for the Paleo-Asian Ocean and the Mongol-Okhotsk Ocean".Journal of Geophysical Research: Solid Earth 125.2(2020).