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Earth Institute Research Projects

Cl Isotope Systematics of the Neogene Izu Bonin Arc Volcanic Rocks

Lead PI: Dr. Susanne M. Straub

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

March 2006 - June 2008
Inactive
Pacific Ocean ; Lamont Doherty Earth Observatory (LDEO) ; Austin, TX ; Izu Bonin arc
Project Type: Research

DESCRIPTION: δ37Cl values were determined for Izu Bonin arc magmas erupted 0–44 Ma in order to better understand the time-dependent processing of volatiles in subduction zones.

OUTCOMES: Results show a steady, high Cl flux characterized by positive and negative δ37Cl since at least 42 Ma, which points to serpentinite subduction at the Izu Bonin trench and thus confirms their importance as fluid sources at arc front depths as well as the return of isotopically positive and negative Cl from the Earth surface to the mantle.

SPONSOR:

National Science Foundation (NSF)

FUNDED AMOUNT:

$107,569

RESEARCH TEAM:

Jaime Barnes

EXTERNAL COLLABORATORS:

University of Texas Austin

PUBLICATIONS:

Barnes, J.D., Straub, S.M., 2010. Chlorine stable isotope variations in Izu Bonin tephra: Implications for serpentinite subduction. Chemical Geology, 272: 62–74, doi:10.1016/j.chemgeo.2010.02.005.

KEYWORDS

izu bonin cl isotopes serpentinite volcanic ash volatile volcanic arc

THEMES

Earth fundamentals