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Oceanic plateau formation by seafloor spreading implied by Tamu Massif magnetic anomalies
Sager, William W.; Huang, Yanming1,2; Tominaga, Masako; Greene, John A.; Nakanishi, Masao4; Zhang, Jinchang5
AbstractTamu 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.
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Document Type期刊论文
Affiliation1.[Sager, William W.] Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77004 USA
2.Yangtze Univ, Minist Educ, Key Lab Explorat Technol Oil & Gas Resources, Wuhan, Hubei, Peoples R China
3.Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA
4.Tominaga, Masako; Greene, John A.] Texas A&M Univ, Dept Geol & Geophys, College Stn, TX USA
5.Chiba Univ, Grad Sch Sci, Chiba, Japan
6.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Sager, William W.,Huang, Yanming,Tominaga, Masako,et al. Oceanic plateau formation by seafloor spreading implied by Tamu Massif magnetic anomalies[J]. NATURE GEOSCIENCE,2019,12(8):661, +.
APA Sager, William W.,Huang, Yanming,Tominaga, Masako,Greene, John A.,Nakanishi, Masao,&Zhang, Jinchang.(2019).Oceanic plateau formation by seafloor spreading implied by Tamu Massif magnetic anomalies.NATURE GEOSCIENCE,12(8),661.
MLA Sager, William W.,et al."Oceanic plateau formation by seafloor spreading implied by Tamu Massif magnetic anomalies".NATURE GEOSCIENCE 12.8(2019):661.
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