气候变化领域集成服务门户(CCPortal): An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province

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DOI	10.1029/2019JB019111
	An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province
	Wei B.; Yang X.; Cheng X.; Domeier M.; Wu H.; Kravchinsky V.A.; Zhou Y.; Jiang N.; Wu Y.; Huo F.; Zhang W.; Zhang Y.; Shao R.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	This paper presents a quantitative characterization of the early Permian latitude and longitude of the Tarim block and its relationship to the supercontinent Pangea using a combination of newly acquired paleomagnetic data and inferences drawn from the plume generation zone reconstruction method. Early Permian magmatic rocks from Tarim have previously been interpreted as constituents of a large igneous province (LIP) and were therefore possibly derived from a mantle plume originating at the core-mantle boundary. Here, we present the results of a paleomagnetic investigation of early Permian rocks (~288 Ma) in the Keping area of northwestern Tarim. A stable high-temperature component (HTC) was isolated from 413 samples from 51 sites. The directions of this HTC pass the fold test and are of exclusively reversed polarity, which is consistent with their acquisition during the late Carboniferous to mid-Permian Kiaman Reverse Polarity Superchron, suggesting that the HTC is likely primary. From these results, we compute a new early Permian pole for Tarim: 50.1°N, 170.5°E, A95 = 3.6°. Taking the estimated eruption center of the Tarim LIP (41°N, 80°E) as a reference point, this pole restores the LIP to a paleolatitude of ~30° at 288 Ma. Given this paleolatitude estimate, we attempt to fit the LIP to the edge of one of the large low shear velocity provinces in the lowermost mantle. It is not feasible to reconstruct the Tarim LIP directly above the margins of either the African or Pacific large low shear velocity provinces, but its reconstructed position could potentially be associated with the “Perm” anomaly. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	early Permian; large igneous province; paleomagnetism; Pangea; plume generation zones; Tarim
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/187855
作者单位	State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, China; Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway; Geophysics, Department of Physics, University of Alberta, Edmonton, AB, Canada
推荐引用方式 GB/T 7714	Wei B.,Yang X.,Cheng X.,et al. An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province[J],2020,125(5).
APA	Wei B..,Yang X..,Cheng X..,Domeier M..,Wu H..,...&Shao R..(2020).An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Wei B.,et al."An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province".Journal of Geophysical Research: Solid Earth 125.5(2020).