峨眉山地幔羽流头部解剖:新的地质年代、地球化学和地质数据的启示

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Hongbo Li, Zhaochong Zhang, Ran Liu, Marc K. Reichow, Jiang Zhu, Richard Ernst, M. Santosh, Wei Wang, Changquan Li, Botong Li
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引用次数: 0

摘要

地幔羽流与大型火成岩带(LIPs)的形成之间的联系已经得到证实,但其解剖结构仍不明确。最近的实验研究和地球物理数据表明,地幔羽流头部更可能是不规则和不对称的,而不是一个轴对称的扁平圆盘。峨眉山大火成岩省(ELIP)为验证这一假设提供了独特的机会。根据来自四川盆地二叠纪晚期玄武岩的强有力的岩石学、地质年代学和地球化学证据,并结合峨眉山大火成岩省的地质图和已公布的地球化学数据的综合汇编,我们确定了几个巨大的径向 "指状 "结构。根据ELIP从中心到边缘的浅地幔源和岩石圈-热成层边界的地貌,我们提出了一个新的地幔羽流模型来解释峨眉山羽流外围的演化,即从羽流主体到扁平羽流头部边缘向外发展的窄指状突起和羽流。拖曳的手指可能被撕裂成一些羽状体,这些羽状体分散开来,被困在最薄的岩石圈下,最终喷发出来,在ELIP外区形成小规模的洪积玄武岩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Anatomy of the Emeishan Mantle Plume Head: Insights From New Geochronologic, Geochemical, and Geologic Data

Anatomy of the Emeishan Mantle Plume Head: Insights From New Geochronologic, Geochemical, and Geologic Data

The link between mantle plumes and the formation of large igneous provinces (LIPs) is well established although the anatomy of these remains equivocal. Recent experimental studies and geophysical data suggest that the mantle plume head is more likely to be irregular and asymmetric, rather than an axisymmetric flattened disk. The Emeishan large igneous province (ELIP) provides a unique opportunity to test this hypothesis. According to robust petrographic, geochronologic, and geochemical evidence from the late Permian basalts in the Sichuan Basin, and in conjunction with a comprehensive compilation of geologic maps and published geochemical data from the ELIP, we identified several giant radial “fingering” structures. Based on the shallow mantle source from the center to margin in the ELIP and relief of the lithosphere-asthenosphere boundary, we propose a new mantle plume model to explain the evolution of the Emeishan plume periphery, where narrow finger-like protrusions and plumelets developed outwards from the main body of the plume to the edges of the flattened plume head. Dragged fingers might have been torn apart into some plumelets, which dispersed and were trapped beneath the thinnest lithosphere relief, and eventually erupted to form small-scale flood basalt in the Outer Zone of the ELIP.

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来源期刊
Geochemistry Geophysics Geosystems
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.
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