An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province
An Absolute Paleogeographic Positioning of the Early Permian Tarim Large Igneous Province
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塔里木早二叠世火成岩省的绝对古地理定位
DOI：
10.1029/2019jb019111
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发表时间：
2020-05
影响因子：
3.9
通讯作者：
Shao Ruiqi
中科院分区：
文献类型：
--
作者：
Wei Bitian;Yang Xingfeng;Cheng Xin;Domeier Mathew;Wu Hanning;Kravchinsky Vadim A.;Zhou Yanan;Jiang Nan;Wu Yiying;Huo Feifei;Zhang Weijie;Zhang Yichen;Shao Ruiqi
本文提出了一个定量表征的早二叠世的纬度和经度的塔里木地块及其关系的超大陆盘古大陆使用相结合的新获得的古地磁数据和推断得出的烟羽生成带重建方法。塔里木早二叠世岩浆岩以前被解释为一个大火成岩省（LIP）的组成部分，因此可能来自于起源于核幔边界的地幔柱。本文介绍了塔里木西北部柯坪地区早二叠世（~288 Ma）岩石的古地磁研究结果。从51个研究中心的413份样本中分离出稳定的高温组分（HTC）。该HTC的方向通过了褶皱测试，并且完全具有反向极性，这与它们在晚石炭世至中二叠世Kiaman反向极性超时期间的采集一致，表明HTC可能是原生的。根据这些结果，我们计算出塔里木早二叠世的一个新极点：50.1°N，170.5°E，A95 = 3.6°。以估计的塔里木LIP喷发中心（41°N，80°E）为参考点，该极点恢复了LIP在288 Ma时的古纬度~30°。鉴于这一古纬度估计，我们试图适应LIP的边缘的一个大的低剪切速度省在最低的地幔。在非洲或太平洋大的低剪切速度区的边缘上方直接重建塔里木LIP是不可行的，但其重建位置可能与“彼尔姆”异常有关。
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.
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作者：
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通讯作者：
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影响因子：
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影响因子：
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