image: Decoupling between active migration of the South Atlantic mid-oceanic ridge and passive mantle convection beneath the divergent lithospheric mantle-level spreading center. The neutrally buoyant compositional anomalies are deduced to be detached lithospheric mantle. Based on this model, the toroidal and poloidal mantle convection under the South Atlantic Ocean is passively controlled by the combined effect of plume, slab window, LLSVP and asymmetric extension. In the Neo-Mesozoic, the African Plate was relatively fixed and the South American Plate drifted westward with a clockwise rotation. view more
Credit: GeoGeo
Passive magmatism on Earth and Earth-like planets
https://doi.org/10.1016/j.geogeo.2021.10.003
Announcing a new publication for Geosystems and Geoenvironment journal. Geosystems and Geoenvironment is a quarterly international interdisciplinary journal in English that publishes high quality original research articles and timely reviews in interdisciplinary fields of Earth and Environment Sciences. Geosystems and Geoenvironment provides an integrated platform to publish breakthrough data and findings, as well as innovative concepts and models, related to the emergence and all related aspects of surface or deep Earth Systems and their planetary equivalents.
In this article researchers from the Ocean University of China, Qingdao, China, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China, University of Illinois at Urbana-Champaign, Urbana, IL, USA and Northwest University, Xi'an, China discuss how magmatism has occurred throughout Earth's history. From the early Earth to the modern plate-tectonic Earth, the amount of magmatism has varied, but it has always occurred on multiple scales, in various tectonic environments and at various depths in the crust and mantle. Magma compositions are also variable.
In this article, the authors put forward that the mechanism of magma emplacement has generally been passive at all stages of Earth evolution. They conclude that most magmatism related to subduction, rifting, mid-oceanic spreading, flood basalts and large igneous provinces and related to mantle upwellings, magma underplating, slab windows, orogenic collisions as well as Archean TTG formation are predominantly passive from the lithosphere-scale to the crystal-scale. The results of their research discussed in this article weigh against the view that magmatism drives plate motions. Most of the magmatism on other Earth-like planets is also passive regardless of the tectonic environments.
Article reference: Sanzhong Li, Xiyao Li, Jie Zhou, Huahua Cao, Lijun Liu, Yiming Liu, Guozheng Sun, Yanhui Suo, Yang Li, Shengyao Yu, Zhaoxia Jiang, Passive magmatism on Earth and Earth-like planets, Geosystems and Geoenvironment, Volume 1, Issue 1, 2022, 100008, ISSN 2772-8838, https://doi.org/10.1016/j.geogeo.2021.10.003.
Keywords: Passive magmatism; Plate tectonics; Mantle plumes; Emplacement
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ISSN 2772-8838
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