Catastrophic slab loss in southwestern Pangea preserved in the mantle and igneous record.
Catastrophic slab loss in southwestern Pangea preserved in the mantle and igneous record.
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DOI：
10.1038/s41467-022-28290-z
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发表时间：
2022-02-04
影响因子：
16.6
通讯作者：
Navarrete CR
中科院分区：
文献类型：
--
作者：
Gianni GM;Navarrete CR
Choiyoi岩浆区代表了二叠纪-三叠纪中期盘古大陆西南部的一个主要的岩浆活动，其起源仍然存在激烈的争论。在这里，我们整合板块运动学重建和下地幔板记录西南盘古大陆晚古生代-中生代俯冲板块配置提供线索。此外，我们还编制了地质年代学资料，并利用构造-岩浆判别图解分析了地球化学数据。我们证明，这一岩浆事件造成的大规模板片损失。重建的2，800 - 3，000公里宽的板片间隙与Choiyoi岩浆区之间的古地理巧合和地球化学数据表明后者中存在板片断裂指纹，支持了这一点。板片断裂事件是兼容的二叠纪古地理修改西南盘古。这些研究结果使Choiyoi岩浆省的最古老的例子，一个地质约束板损失事件，并打开新的途径，以评估地球动力学背景的巨大火成岩省回到晚古生代。通过将火成岩记录、板块运动学重建和深部地幔联系起来，对二叠纪-三叠纪Choiyoi大火成岩省（SLIP）的起源进行了评估。这项研究表明，起源与盘古大陆的大规模板块损失有关。
The Choiyoi Magmatic Province represents a major episode of silicic magmatism in southwestern Pangea in the mid-Permian-Triassic, the origin of which remains intensely debated. Here, we integrate plate-kinematic reconstructions and the lower mantle slab record beneath southwestern Pangea that provide clues on late Paleozoic-Mesozoic subducting slab configurations. Also, we compile geochronological information and analyze geochemical data using tectono-magmatic discrimination diagrams. We demonstrate that this magmatic event resulted from a large-scale slab loss. This is supported by a paleogeographic coincidence between a reconstructed 2,800-3,000-km-wide slab gap and the Choiyoi Magmatic Province and geochemical data indicating a slab break-off fingerprint in the latter. The slab break-off event is compatible with Permian paleogeographic modifications in southwestern Pangea. These findings render the Choiyoi Magmatic Province the oldest example of a geophysically constrained slab loss event and open new avenues to assess the geodynamic setting of silicic large igneous provinces back to the late Paleozoic. The origin of the Permian-Triassic Choiyoi silicic large igneous province (SLIP) is assessed by linking the igneous record, plate-kinematic reconstructions, and the deep mantle. This study suggests an origin related to a massive slab loss in Pangea.
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影响因子：
2.3
作者：
Butterworth, N. P.;Talsrna, A. S.;Heine, C.
通讯作者：
Heine, C.
影响因子：
5.2
作者：
Domeier, Mathew;Doubrovine, Pavel V.;Bull, Abigail L.
通讯作者：
Bull, Abigail L.
影响因子：
16.6
作者：
Braszus B;Goes S;Allen R;Rietbrock A;Collier J;Harmon N;Henstock T;Hicks S;Rychert CA;Maunder B;van Hunen J;Bie L;Blundy J;Cooper G;Davy R;Kendall JM;Macpherson C;Wilkinson J;Wilson M
通讯作者：
Wilson M
影响因子：
64.8
作者：
Chen, Yi-Wei;Wu, Jonny;Suppe, John
通讯作者：
Suppe, John
影响因子：
1.8
作者：
Bastias-Mercado, Francisco;Gonzalez, Javiera;Oliveros, Veronica
通讯作者：
Oliveros, Veronica