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Earth Institute Research Projects

Collaborative research: Geochemical variation of the Pacific crust subducting beneath the Izu-Bonin

Lead PI: Dr. Susanne M. Straub

Unit Affiliation: Geochemistry, Lamont-Doherty Earth Observatory (LDEO)

May 2014 - April 2018
Inactive
Pacific Ocean ; Lamont Doherty Earth Observatory (LDEO)
Project Type: Research

DESCRIPTION: The projects aims to test the proposed strong compositional link between Izu Bonin arc magmas and altered oceanic crust subducted at the Izu Bonin Trench. We obtained samples of the basaltic crust from a ~900 km transect along the Izu Bonin trench by dredging active, vertical fault scarps along the Pacific Plate, and analysed friom major and trace elements and Sr-Nd-Pb-Hf radiogenic isotope ratios.

OUTCOMES: Our results confirmd, however, the compositional disparity between the altered coeanic crust at then trench and Izu Bonin arc volcanic rocks.. We are moving on to additional tests in the northwest Pacific oceanic basin that shall constrain the causes of the compositional disparity that is unique in the global spectrum of arcs.

SPONSOR:

National Science Foundation (NSF)

FUNDED AMOUNT:

$166,981

RESEARCH TEAM:

Paterno Castillo, Quanshu Yan

EXTERNAL COLLABORATORS:

Scripps Institute of Oceanography, Qingdao Sio International Trading Co.

WEBSITE:

https://www.nsf.gov/awardsearch/showAward?AWD_ID=1333235&HistoricalAwards=false

PUBLICATIONS:

Durkin, K., Castillo, P.R., Abe, N., Straub, S.M., Kaneko, R., Tamura, Y., Yan, Q., submitted. An Origin of the Latitudinal Compositional Variation in the Izu-Bonin Arc System. Geoscience Frontiers.

KEYWORDS

magma basaltic oceanic crust lead (Pb) isotopes pacific plate volcanic arc izu bonin arc

THEMES

Earth fundamentals