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Expedition 345: Hess Deep plutonic crust: exploring the plutonic crust at a fast-spreading ridge: new drilling at Hess Deep

Citation

Gillis, KM and Snow, JE and Klaus, A and Guerin, G and Abe, N and Akizawa, N and Ceuleneer, G and Cheadle, MJ and Adriao, A and Faak, K and Falloon, TJ and Friedman, SA and Godard, MM and Harigane, Y and Horst, AJ and Hoshide, T and Ildefonse, B and Jean, MM and John, BE and Koepke, JH and Machi, S and Maeda, J and Marks, NE and McCaig, AM and Meyer, R and Morris, A and Nozaka, T and Python, M and Saha, A and Wintsch, RP, Expedition 345: Hess Deep plutonic crust: exploring the plutonic crust at a fast-spreading ridge: new drilling at Hess Deep, Proceedings of the Integrated Ocean Drilling Program, 345 pp. 1-49. ISSN 1930-1014 (2014) [Non Refereed Article]


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DOI: doi:10.2204/iodp.proc.345.101.2014

Abstract

Integrated Ocean Drilling Program (IODP) Hess Deep Expedition 345 was designed to sample lower crustal primitive gabbroic rock that formed at the fast-spreading East Pacific Rise (EPR) in order to test competing models of magmatic accretion and the intensity of hydrothermal cooling at depth. The Hess Deep Rift was selected to exploit tectonic exposures of young EPR plutonic crust, building upon results from Ocean Drilling Program Leg 147 as well as more recent submersible, remotely operated vehicle, and nearbottom surveys. The primary goal was to acquire the observations required to test end-member crustal accretion models that were in large part based on relationships from ophiolites, in combination with mid-ocean ridge geophysical studies. This goal was achieved with the recovery of primitive layered olivine gabbro and troctolite with many unexpected mineralogical and textural relationships, such as the abundance of orthopyroxene and the preservation of delicate skeletal olivine textures.

Item Details

Item Type:Non Refereed Article
Keywords:ocean crust, Hess Deep gabbro layering troctolite
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Inorganic Geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Falloon, TJ (Dr Trevor Falloon)
ID Code:96653
Year Published:2014
Deposited By:Earth Sciences
Deposited On:2014-11-14
Last Modified:2015-03-11
Downloads:0

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