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Southeast Indian Ridge

The Effects of Changes in Mantle Temperature on Melt Supply and Crustal Accretion

An MCS Reflection and OBH Refraction Study of the Southeast Indian Ridge

PIs:

James R. Cochran (LDEO)

Suzanne Carbotte (LDEO)

Maya Tolstoy (LDEO)

 

Cruise Report

GJI Publication

G-Cubed Publication

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Experiment Summary

(Taken from NSF Abstract Award #9911720): This is a geophysical investigation of the dependence of melt supply on mantle temperature and the effects of the variation in melt supply along the Southeast Indian Ridge on the crustal accretion process. The investigation involves a seismic experiment including both refraction lines utilizing ocean-bottom hydrophones to determine variations in crustal thickness and upper mantle seismic velocity and multichannel seismic reflection surveys to determine the internal structure of the crust. Since the spreading rate and the mantle source both are nearly constant along this portion of the Southeast Indian Ridge, the along-axis variation in depth can reasonable be ascribed primarily to the effects of an along-axis variation in mantle temperature.

Cruises

12/7/2001 - 1/20/2002

6 deployments of 4 ocean-bottom hydrophones each were recovered on board the R/V Maurice Ewing.

Data

Data from all instruments deployed are archived under temporary network code ZM and assembled data set ID #02-011 at the IRIS DMC.