Oceanic plateau formation by seafloor spreading implied by Tamu Massif magnetic anomalies

Oceanic plateau formation by seafloor spreading implied by Tamu Massif magnetic anomalies
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塔姆地块磁异常暗示海底扩张导致海洋高原形成

DOI:
10.1038/s41561-019-0390-y
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发表时间:
2019-08
期刊:
影响因子:
18.3
通讯作者:
J. Zhang
J. Zhang
中科院分区:
地球科学1区
文献类型:
--
作者:
Sager W. W.;Y. Huang;M. Tominaga;J. A. Greene;M. Nakanishi;J. Zhang

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塔姆地块是一座巨大的中生代海底火山,是沙茨基隆起海洋高原的主要建筑。它位于扩张山脊三重交界处,但被认为是一座盾状火山,由新兴地幔柱的喷发火山作用形成。然而,目前尚不清楚塔姆地块的喷发如何与扩张的山脊相互作用,而扩张的山脊本身就是巨大的线状火山。在这里,我们创建了塔姆地块的磁异常图,它可以提供有关地壳形成的线索。对于塔姆地块,我们发现主要是由相反磁极性的地壳块引起的线性磁场异常。这种模式表明塔姆地块不是一座盾状火山,而是被大量、集中的山脊火山活动所占据。如果沙茨基隆起的岩浆源是羽流,那么它与海底扩张密切相关并受其控制。言外之意,即使是最大的海洋高原建筑也可以通过海底扩张形成。我们建议需要重新考虑大陆溢流玄武岩和海洋高原之间广泛接受的类比。
Tamu Massif is an immense Mesozoic submarine volcano, the main edifice of the Shatsky Rise oceanic plateau. It is located at a spreading ridge triple junction, but considered to be a shield volcano formed by effusive volcanism from an emerging mantle plume. However, it is unclear how Tamu Massif eruptions interacted with the spreading ridges, which are enormous linear volcanoes themselves. Here we create a magnetic anomaly map for Tamu Massif, which can provide clues about crustal formation. For Tamu Massif, we find dominantly linear magnetic field anomalies caused by crustal blocks of opposite magnetic polarity. This pattern suggests that Tamu Massif is not a shield volcano, but was emplaced by voluminous, focused ridge volcanism. If the magma source at the Shatsky Rise was a plume, it was closely connected to and controlled by seafloor spreading. By implication, even the largest oceanic plateau edifices can be formed by seafloor spreading. We suggest that the widely accepted analogy between continental flood basalts and oceanic plateaus requires reconsideration.
DOI: 10.1016/j.epsl.2018.08.029
发表时间: 2018-11
影响因子: 5.3
作者:
Yanming Huang;W. Sager;M. Tominaga;J. Greene;Jinchang Zhang;M. Nakanishi
通讯作者: Yanming Huang;W. Sager;M. Tominaga;J. Greene;Jinchang Zhang;M. Nakanishi
DOI: 10.1002/2017gc007045
发表时间: 2017-11
期刊: Geochemistry
影响因子: 3.7
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DOI: 10.1130/dnag-spec-v1.171
发表时间: 1982
期刊: --
影响因子: --
作者:
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通讯作者: D. Hussong;E. Winterer;R. Decker
DOI: 10.1126/sciadv.1601107
发表时间: 2016-12
期刊: Science advances
影响因子: 13.6
作者:
Rowley DB;Forte AM;Rowan CJ;Glišović P;Moucha R;Grand SP;Simmons NA
通讯作者: Simmons NA
DOI: 10.1126/science.246.4926.103
发表时间: 1989-10-06
期刊: SCIENCE
影响因子: 56.9
作者:
RICHARDS, MA;DUNCAN, RA;COURTILLOT, VE
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