气候变化领域集成服务门户(CCPortal): An Inclination Shallowing-Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto-Asia

CCPortal

DOI	10.1029/2020JB019489
	An Inclination Shallowing-Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto-Asia
	Zhao P.; Appel E.; Xu B.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	The Early Mesozoic is a key period for the formation of the Asia continent. In this study, in order to reconstruct the Early Mesozoic paleogeography of Proto-Asia, we carried out a paleomagnetic study on the Early Triassic strata from the Chengde Basin in the northeastern North China Craton (NCC). Rock magnetic investigations reveal magnetite and hematite as the main magnetic carriers. Characteristic remanent magnetization directions from 21 sites show normal and reversed polarities and site-mean directions pass fold tests. After inclination shallowing (IS) correction with the elongation/inclination method, a mean direction is calculated at Ds/Is = 322.5°/39.5° (ks = 32.6, α95s = 5.7°) in stratigraphic coordinates. The corresponding Early Triassic paleomagnetic pole (λ/φ = 53.5°N/9.5°E, A95 = 5.3°) overlaps with coeval poles that have also been corrected for IS reported from the western part of the NCC. This result indicates that there is no relative movement between the eastern and western parts of the NCC. With all IS-corrected paleomagnetic poles, a mean Early Triassic pole is recalculated for the NCC at λ/φ = 59.4°N/13.4°E (A95 = 4.7°). We use this pole to reconstruct the paleogeography of Proto-Asia and confirm previous studies that did not use IS corrections, in which two “triangle bay-shaped” oceans, the Paleo-Tethys Ocean and the Mongol-Okhotsk Ocean, existed along the southern and northern margins of the unified NCC-Mongolian Block (MOB). Clockwise rotations of the South China Craton and Siberia Craton relative to the NCC-MOB during the Early Mesozoic led to the final closure of both oceans. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Chengde Basin; Early Triassic; North China Craton; paleogeographic reconstruction; paleomagnetism; Proto-Asia
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/187547
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Innovation Academy for Earth Science, CAS, Beijing, China; Department of Geosciences, University Tübingen, Tübingen, Germany; College of Earth Sciences, Hebei GEO University, Shijiazhuang, China
推荐引用方式 GB/T 7714	Zhao P.,Appel E.,Xu B.. An Inclination Shallowing-Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto-Asia[J],2020,125(10).
APA	Zhao P.,Appel E.,&Xu B..(2020).An Inclination Shallowing-Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto-Asia.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Zhao P.,et al."An Inclination Shallowing-Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto-Asia".Journal of Geophysical Research: Solid Earth 125.10(2020).