Paleolatitude of Mafic Dykes in the Xiugugabu ophiolite: Implications for the intraoceanic Trans-Tethyan subduction zone and multistage India-Eurasia collision

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-08-12 DOI:10.1016/j.tecto.2024.230466
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Abstract

An intraoceanic Trans-Tethyan subduction zone has been identified in both the Kohistan-Ladakh arc and the West Burma Terrane. This has significant implications for the India-Eurasia collision. Concurrently, the dismembered ophiolites within the Yarlung-Tsangpo Suture Zone likely originated from the intraoceanic Trans-Tethyan subduction zone or the Andean-type southern Eurasian continental margin. A paleomagnetic study was conducted on the Lower Cretaceous (∼120–130 Ma) mafic dykes in the Xiugugabu ophiolite to resolve the uncertainty of its origin. The characteristic remanent magnetization (ChRM) obtained through stepwise thermal demagnetization successfully passed consistency/fold and reversal tests. After tilt correction, the overall mean direction of the ChRM was D = 296.9°, I = −25.5°, k = 47.6, α95 = 4.5°, and N = 22, indicating a paleolatitude of 13.4°N/S and a paleopole at 15.0° N, 326.6°E with A95 = 3.8°. Compared with previous paleomagnetic data from the Trans-Tethyan subduction zone, our findings strongly support the involvement of the Xiugugabu ophiolite in the intraoceanic Trans-Tethyan subduction zone. This finding reinforces the hypothesis that there were two distinct subduction zones in the Neotethyan Ocean during the Early Cretaceous. One subduction zone was situated on the southern margin of the Gangdese Arc. The second was the intraoceanic subduction zone, located approximately 3500 km from the southern margin of Eurasia, in the southern hemisphere. Our results also support a multistage India–Eurasia collision process involving continental plates, intraoceanic arcs, and terranes within the Neo-Tethyan Ocean.

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秀姑古布蛇绿混杂岩岩浆岩的古地理位置:对洋内跨泰坦俯冲带和印度-欧亚大陆多级碰撞的影响
在科希斯坦-拉达克弧和西缅甸地层中发现了一个洋内跨泰西俯冲带。这对印度-欧亚大陆碰撞具有重要影响。同时,雅鲁藏布断裂带内的肢解蛇绿混杂岩很可能起源于洋内跨紫塞亚俯冲带或安第斯型欧亚大陆南缘。为解决其起源的不确定性,对秀姑嘎布蛇绿岩中的下白垩统(120-130Ma)岩浆岩岩体进行了古地磁研究。通过分步热退磁获得的特征剩磁成功通过了一致性/折叠性和反转性测试。经过倾斜校正后,特征剩磁的总体平均方向为 D = 296.9°,I = -25.5°,k = 47.6,α95 = 4.5°,N = 22,表明古纬度为 13.4°N/S,古极点位于北纬 15.0°,东经 326.6°,A95 = 3.8°。与以往跨泰西俯冲带的古地磁数据相比,我们的发现有力地支持了秀姑洼蛇绿岩卷入跨泰西洋内俯冲带。这一发现加强了早白垩世新紫金山洋内存在两个不同俯冲带的假设。一个俯冲带位于冈底斯弧南缘。第二个是洋内俯冲带,位于南半球距欧亚大陆南缘约3500千米处。我们的研究结果还支持印度-欧亚大陆的多级碰撞过程,其中涉及大陆板块、洋内弧和新泰西洋内的地块。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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