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Earth Institute Research Projects

The Sr-Nd-Pb-Hf Isotope Evolution of the Mariana Island Arc

Lead PI: Dr. Susanne M. Straub

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

April 2009 - September 2013
Inactive
Pacific Ocean ; Lamont Doherty Earth Observatory (LDEO) ; Mariana Arc
Project Type: Research

DESCRIPTION: The project reconstructed the last 34 Ma of the compositional evolution of the intra-oceanic Mariana volcanic arc by means of the distal ash bed recorded embedded into the nearby marine sediments. This was done by obtaining a comprehensive suite of major and trace elements and Sr-Nd-Pb-Hf isotope ratios from the ash particles.

OUTCOMES: Our results confirm the divergent compositional evolution of the Mariana arc and the neighboring Izu Bonin arcs as a result of the collosion of the Mariana arc with the West Pacific Seamount Province that begun ca. 15 million years ago.

SPONSOR:

National Science Foundation (NSF)

FUNDED AMOUNT:

$232,546

RESEARCH TEAM:

Jon Woodhead, Richard Arculus

EXTERNAL COLLABORATORS:

University of Melbourne, University of Canberra

WEBSITE:

https://www.nsf.gov/awardsearch/showAward?AWD_ID=0840848&HistoricalAwards=false

PUBLICATIONS:

Straub, S.M., Woodhead, J.D., Arculus, R.J., 2015b. Temporal evolution of the Mariana Arc: mantle wedge and subducted slab controls revealed with a tephra perspective. J Petrol, 56 (2): 409-439, doi: 10.1093/petrology/egv005

KEYWORDS

fadiogenic isotopes magma izu bonin-mariana volcanic ash recycling volcanic arc arc evolution subduction

THEMES

Earth fundamentals