青藏高原仲巴微地层早中泥盆世古地磁结果:起源于大印度北缘的证据

Shuai Li, Yalin Li, Xiaodong Tan, Zhongpeng Han, Chengshan Wang, Zining Ma, Yunchuan Xu, Zihao Wang, Siqi Xiao, Jianbo Cheng, Zijian Li, Xingduo Ma, Zichun Guo, Song Huang
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摘要

古生代冈瓦纳的初步解体为新生代青藏高原的形成奠定了基础。确定古生代冈瓦纳微地块的相对位置,不仅有助于了解这些微地块随后的漂移和增生过程,而且对冈瓦纳古地理重建也至关重要。然而,由于缺乏对冈瓦纳北部泥盆纪微岩古地理的古地磁约束,这项工作具有挑战性。在此,我们首次报告了中坝微岩早-中泥盆纪沉积物的古地磁结果。在地层坐标中,该地点的平均方向为:偏角(Ds)=310.7°,倾角(Is)=-67.2°,ks=31.2,α95=8.3°,n=11。积极的褶皱和反转测试,以及岩石磁学结果和显微镜观察,都强烈表明剩磁载体是沉积成因。古地磁结果符合古地磁可靠性标准,因此可用于构造重建。我们的结果将中坝微岩的古纬度推定为早泥盆世-中泥盆世的50.0°S ± 11.7°S。结合已发表的碎屑锆石年龄、古地磁结果和地质数据,我们的数据表明,仲巴微地层与拉萨地层没有构造亲缘关系,在408-388Ma期间是大印度北缘的一部分,并与南羌塘地层、德钦喜马拉雅山和其他地层一起形成了连续的东冈瓦纳北部大陆边缘。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Early−Middle Devonian paleomagnetic results from the Zhongba microterrane, Tibetan Plateau: Evidence for its origin from the northern margin of Greater India
The initial disintegration of Gondwana during the Paleozoic laid the foundation for the formation of the Tibetan Plateau in the Cenozoic. Determining the relative positions of the microterranes in Gondwana during the Paleozoic not only informs the subsequent drift and accretion processes of these microterranes but is also crucial to the paleogeographic reconstruction of Gondwana. However, the lack of paleomagnetic constraints on the Devonian paleogeography of the microterranes in the northern part of Gondwana makes this effort challenging. Here, we report paleomagnetic results for the first time from the Early−Middle Devonian sediments of the Zhongba microterrane. The site-mean direction is declination (Ds) = 310.7°, inclination (Is) = −67.2°, ks = 31.2, α95 = 8.3°, and n = 11, in stratigraphic coordinates. Positive fold and reversal tests, together with rock magnetism results and microscopic observations, strongly suggest that the remanence carriers are of depositional origin. The paleomagnetic results meet the paleomagnetic reliability criteria and therefore can be used for tectonic reconstructions. Our results constrain the paleolatitude of the Zhongba microterrane to be 50.0°S ± 11.7°S in the Early−Middle Devonian. Combined with published detrital zircon ages as well as paleomagnetic results and geological data, our data indicate that the Zhongba microterrane, which had no tectonic affinity with the Lhasa terrane, was part of the northern margin of Greater India during 408−388 Ma and coupled with the South Qiangtang terrane, Tethyan Himalayas, and other terranes to form the continuous northern continental margin of East Gondwana.
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