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Earth Institute Research Projects

Collaborative Research: Fluid Transport and Fluid-Rock Interactions Preserved in Two Serpentinite Melanges in Guatemala Suture Zone

Lead PI: Dr. Hannes K. Brueckner

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

July 2011 - June 2016
Inactive
South America ; Guatemala
Project Type: Research

DESCRIPTION: The team will detail major, minor, and trace-element geochemistry as well as Sr-Nd-Hf isotopic systematics to examine the serpentinite mélanges of the Guatemala Suture Zone to elucidate the record of mass transport by fluid recorded in the rocks.

OUTCOMES: The mélage underwent HP-LT metamorphism throughout most of the Cretaceous suggesting continuous subduction. Fluids hydrated most assemblages and generally show a sedimentary signature imposed on MORB trace element and isotopic pattern. Jadeitites and other vein assemblages crystallized out of trace element rich hydrothermal systems.

SPONSOR:

National Science Foundation (NSF)

FUNDED AMOUNT:

$48,441

RESEARCH TEAM:

George Harlow, Kennet Flores, Yue Cai, Celine Martin, Horst Marschall, Jinny Sisson, Sorena Sorensen

EXTERNAL COLLABORATORS:

American Museum of Natural History, Brooklyn College of CUNY

WEBSITE:

https://www.nsf.gov/awardsearch/showAward?AWD_ID=1119456&HistoricalAwards=false

PUBLICATIONS:

1). Harlow, GE, Flores, KE, Marschall, HR, 2016, Fluid-mediated mass transfer from a paleosubduction channel to its mantle wedge: Evidence from jadeitite and related rocks from the Guatemala Suture Zone. LITHOS 258, 15-36.

2). Martin, C., Flores, K..E., Harlow, G. E., 2016, Boron isotopic discrimination for subduction-related serpentinites. GEOLOGY 44/11, 899-902.

3). Flores, K.E.; Martens, U.C.; Harlow, G.E. 2013, Jadeitite formed during subduction: In situ zircon geochronology constraints from two different tectonic events within the Guatemala Suture Zone, EARTH AND PLANETARY SCIENCE LETTERS 371, 67-81. 2013

4). Brueckner, H. K., Lallemant, H. G. A., Sisson, V.B.; et al., 2009, Metamorphic reworking of a high pressure-low temperature melange along the Motagua fault, Guatemala: A record of Neocomian and Maastrichtian transpressional tectonics. EARTH AND PLANETARY SCIENCE LETTERS. 284/1-2, 228-235.

KEYWORDS

geochemistry strontium hafnium geology and tectonics major and trace elements fluid transport neodymium isotopes fluid-rock interactions