The Leg 173 Site 1067 and 1068 amphibolites and metagabbros from the west Iberia margin exhibit variable whole-rock compositions from primitive to more evolved (Mg numbers = 49-71) that are generally incompatible trace and rare earth element enriched (light rare earth element [LREE] = 11-89 x chondrite). The Site 1067 amphibolites are compositionally similar to the basalts reported at Site 899 from this same region, based on trace and rare earth element contents. The Site 1068 amphibolites and metagabbros are similar to the Site 899 diabases but are more LREE enriched. However, the Sites 1067 and 1068 amphibolites and metagabbros are not compositionally similar to the Site 900 metagabbros, which are from the same structural high as the Leg 173 samples. The Leg 173 protoliths may be represented by basalts, diabases, and/or fine-grained gabbros that formed from incompatible trace element-enriched liquids.
1Smith Nagihara, S., and Casey, J.F., 2001. Whole-rock geochemistry of amphibolites and metagabbros from the west Iberia Margin, Leg 173. In Beslier, M.-O., Whitmarsh, R.B., Wallace, P.J., and Girardeau, J. (Eds.), Proc. ODP, Sci. Results, 173 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/173_SR/chap_10/chap_10.htm>. [Cited YYYY-MM-DD]
25539 93rd Street, Lubbock TX 79424, USA. nagihara@swbell.net
3Department of Geosciences, University of Houston, 4800 Calhoun, Houston TX 77204-5503, USA.
Initial
receipt: 20 October 1999
Acceptance: 27 March 2001
Web publication: 10 July 2001
Ms 173SR-011