Strontium isotopic geochemistry of intrusive rocks, Puerto Rico, Greater Antilles

Details Strontium isotopic geochemistry of intrusive rocks, Puerto Rico, Greater Antilles Strontium isotopic geochemistry of intrusive rocks, Puerto Rico, Greater Antilles

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..50..219j&link_type=abstract

Earth and Planetary Science Letters, Volume 50, Issue 1, p. 219-224.

Computer Science

Scientific paper

The strontium isotopic geochemistry is given for three Puerto Rican intrusive rocks: the granodioritic Morovis and San Lorenzo plutons and the Rio Blanco stock of quartz dioritic composition. The average calculated initial 87Sr/86Sr ratios are 0.70370, 0.70355 and 0.70408, respectively. In addition, the San Lorenzo data establish a whole-rock isochron of 71 +/- 2 m.y., which agrees with the previously reported K-Ar age of 73 m.y. Similarity of most of the intrusive rocks in the Greater Antilles with respect to their strontium isotopic geochemistry regardless of their major element composition indicates that intrusive magmas with a wide range of composition can be derived from a single source material. The most likely source material, in view of the available isotopic data, is the mantle wedge overlying the subduction zone.

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