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Contributions of scientific ocean drilling to understanding the emplacement of submarine large igneous provinces and their effects on the environment

Citation

Neal, CR and Coffin, MF and Sager, WW, Contributions of scientific ocean drilling to understanding the emplacement of submarine large igneous provinces and their effects on the environment, Oceanography, 32, (1) pp. 176-192. ISSN 1042-8275 (2019) [Refereed Article]


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Copyright 2019 Oceanography Society

DOI: doi:10.5670/oceanog.2019.142

Abstract

The Ontong Java Plateau (OJP), Shatsky Rise (SR), and Kerguelen Plateau/Broken Ridge (KP/BR) represent three large igneous provinces (LIPs) located in oceanic settings. The basement lavas have been investigated through scientific ocean drilling and, in the case of the OJP, fieldwork on the emergent obducted portions of the plateau in the Solomon Islands. Such studies show that these three LIPs have very different characteristics. For example, the KP/BR still has an active hotspot, whereas the OJP and the SR do not. The OJP is remarkable in its compositional monotony across the plateau (the Kwaimbaita geochemical type), with minor compositional variation found at the margins (the Kroenke, Singgalo, and Wairahito types). Shatsky Rise shows more compositional variation and, like the OJP, has a dominant lava type (termed the "normal" type) in the early stages (Tamu Massif), but subsequent eruptions at the Ori and Shirshov massifs comprise isotopically and trace element enriched lavas, likely reflecting a change in mantle source over time. The KP/BR has highly variable basement lava compositions, ranging from lavas slightly enriched above that of normal mid-ocean ridge basalt in the northern portion (close to the South East Indian Ridge) to more enriched varieties to the south and on Broken Ridge, with a continental crust signature present in lavas from the southern and central KP/BR. The OJP and the KP/BR appear to have formed through punctuated magmatic events, whereas the SR was formed by one relatively long, drawn out event. The formation of oceanic LIPs has in many (but not all) cases been synchronous with oceanic anoxic events. This paper focuses on three oceanic plateaus to emphasize the debate surrounding the environmental impact such LIPs may have had, and also highlights the contributions of scientific ocean drilling to our knowledge of oceanic LIP formation and evolution. This new knowledge allows planning for future oceanic LIP drilling.

Item Details

Item Type:Refereed Article
Keywords:large igneous provinces, International Ocean Discovery Program
Research Division:Earth Sciences
Research Group:Geology
Research Field:Marine Geoscience
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Coffin, MF (Professor Mike Coffin)
ID Code:131633
Year Published:2019
Funding Support:Australian Research Council (LE160100067)
Web of Science® Times Cited:2
Deposited By:Oceans and Cryosphere
Deposited On:2019-03-28
Last Modified:2019-09-05
Downloads:8 View Download Statistics

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