An Oceanic Plateau Induced Subduction Zone Jump From Proto- to Paleo-Tethys in East Kunlun, Northern Tibetan Plateau

IF 2.9 2区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geochemistry Geophysics Geosystems Pub Date : 2025-07-05 DOI:10.1029/2025GC012211

Rutao Zang, Yunpeng Dong, Dazhi Jiang, Dengfeng He, Shengsi Sun, Bo Hui, Bin Zhang

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Abstract

The relationship between the Proto-Tethys and Paleo-Tethys is still debated. Some researchers believe that the Paleo-Tethys opened after the Proto-Tethys closed, while others argue that they are the same ocean with two stages of subduction. We present field geology, geochemical, and geochronological data to support the latter interpretation. We identified a typical oceanic plateau remnant in the East Kunlun Orogenic Belt, northern Tibetan Plateau. The remnant preserves voluminous pillow basalts overlain by limestones and breccias. The pillow basalts are characterized by slight enrichment of LILEs and HSFEs, which are similar to those of modern oceanic plateaus and were derived from 15% to 30% melting of a spinel lherzolite mantle source at a high potential temperature (±1,556°C) suggesting a mantle plume origin. The formation age of the oceanic plateau is determined by zircon U-Pb dating to be 430 ± 3 and 428 ± 3 Ma. We suggest that the oceanic plateau jammed the subduction of the Proto-Tethys and led the subduction zone to jump to a new location, which has been attributed to the subduction of the Paleo-Tethys. This finding also explains the absence of magmatic activities in this region from 370 to 290 Ma.

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青藏高原北部东昆仑地区原-古特提斯洋高原诱导俯冲带跃迁

原始特提斯人和古特提斯人之间的关系仍然存在争议。一些研究人员认为，古特提斯海是在原特提斯海关闭后才打开的，而另一些人则认为，它们是同一个海洋，只是经历了两个俯冲阶段。我们提出了野外地质、地球化学和地质年代学数据来支持后一种解释。在青藏高原北部东昆仑造山带发现了一个典型的海洋高原遗迹。遗迹保存了大量的枕状玄武岩，上面覆盖着石灰岩和角砾岩。枕状玄武岩的LILEs和HSFEs富集程度较低，与现代海洋高原的LILEs和HSFEs富集程度相似，源自尖晶石—辉橄榄岩地幔源在±1556℃的高电位温度下熔融15% ~ 30%，表明其成因为地幔柱。通过锆石U-Pb测年，确定了海洋高原的形成年龄为430±3 Ma和428±3 Ma。我们认为海洋高原阻塞了原特提斯的俯冲，导致俯冲带跃迁到一个新的位置，这归因于古特提斯的俯冲作用。这一发现也解释了370 ~ 290 Ma期间该地区没有岩浆活动。

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来源期刊

Geochemistry Geophysics Geosystems 地学-地球化学与地球物理

CiteScore

5.90

自引率

11.40%

发文量

252

审稿时长

1 months

期刊介绍： Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.