Geochemistry characteristics of Seamounts in the Tonga arc : Influence of subduction component

Title
Geochemistry characteristics of Seamounts in the Tonga arc : Influence of subduction component
Author(s)
명보라; 김정훈; 김종욱; 우현동; 장윤득
KIOST Author(s)
Kim, Jonguk(김종욱)
Publication Year
2015-12-14
Abstract
Located in the southwest Pacific ocean, The seamounts, from TA07 seamount to TA26, in the Tonga arc are located from 20 °S to 25 °S. At 25 °S, the Tonga trench is intersected by the Louisville ridge, a ~4,300-km-long chain of seamounts and the Osbourn trough, a paleo-spreading center. For this reason, magma which created these seamounts may have various origin. Based on this, the seamounts which forming the Tonga arc are divided into three groups including group 1(region that the earliest Louisville ridge subduction arised, correspond to TA07-12), group 2(region that the second Louisville ridge subduction arised, correspond to TA14-24) and group 3(region that the Louisville ridge and the Osbourn trough are subducting, correspond to TA25-26). These seamounts are mostly stratovolcanoes with caldera. Rocks recovered by dredging have been identified as pumice, dacite, andesite, basaltic andesites and basalts(most abundant). Major element concentrations are constant, trace element concentrations are enriched LILE, depleted HFSE compared with MORB. The Tonga arc is affected by subduction components divided into the shallow and deep subduction components. Related to subduction components, variables include mantle source, AOC(altered oceanic crust), PS(pelagic sediment), LSC(Louisville seamount chain) and OS(Osbourn trough). In the case of shallow subduction component, it tends to have higher contents in group 1, 3 and nd the Osbourn trough, a paleo-spreading center. For this reason, magma which created these seamounts may have various origin. Based on this, the seamounts which forming the Tonga arc are divided into three groups including group 1(region that the earliest Louisville ridge subduction arised, correspond to TA07-12), group 2(region that the second Louisville ridge subduction arised, correspond to TA14-24) and group 3(region that the Louisville ridge and the Osbourn trough are subducting, correspond to TA25-26). These seamounts are mostly stratovolcanoes with caldera. Rocks recovered by dredging have been identified as pumice, dacite, andesite, basaltic andesites and basalts(most abundant). Major element concentrations are constant, trace element concentrations are enriched LILE, depleted HFSE compared with MORB. The Tonga arc is affected by subduction components divided into the shallow and deep subduction components. Related to subduction components, variables include mantle source, AOC(altered oceanic crust), PS(pelagic sediment), LSC(Louisville seamount chain) and OS(Osbourn trough). In the case of shallow subduction component, it tends to have higher contents in group 1, 3 and
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24985
Bibliographic Citation
AGU Fall Meeting, pp.1, 2015
Publisher
American Geophysical Union
Type
Conference
Language
English
Publisher
American Geophysical Union
Related Researcher
Research Interests

Geochemistry,Submarine hydrothermal system,Deep-sea mineral,지구화학,해저열수시스템,해양광물자원

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