U-Th isotopic systematics at 13°N east Pacific Ridge segment

Details U-Th isotopic systematics at 13°N east Pacific Ridge segment U-Th isotopic systematics at 13°N east Pacific Ridge segment

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98..129b&link_type=abstract

Earth and Planetary Science Letters, Volume 98, Issue 1, p. 129-137.

Other

20

Scientific paper

Fresh basaltic glasses have been analyzed for U-Th disequilibrium systematics as part of an extensive study on the East Pacific Rise (EPR) at 12°45'N. These samples are well described in terms of major and trace elements as well as in Nd, Pb and Sr isotopes. Our results show significant heterogeneities in the mantle source at a small scale, and show heterogeneities at larger scales also when compared to other EPR data.
U and Th concentration and isotopic data rule out fractional crystallization as a main process and support a mixing model in agreement with the marble cake model developed by Allègre and Turcotte and constrained by trace elements and Nd, Sr and Pb isotopes on the same samples by Prinzhofer et al.
Based on the high (230Th/232Th) isotopic ratios on recent tholeiites especially the Th/U values inferred for their sources clearly show that the upper mantle Th/U has decreased with time.

Affiliated with

Also associated with

No associations

Rating

U-Th isotopic systematics at 13°N east Pacific Ridge segment does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with U-Th isotopic systematics at 13°N east Pacific Ridge segment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and U-Th isotopic systematics at 13°N east Pacific Ridge segment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1380769