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Drilling at Site 476, the most landward of the three-site transect at the tip of Baja California Sur, recovered approximately one meter of partially weathered granite. Certain portions of the granite show severe Cataclastic deformation, possibly mylonitic in part. The fresher portions have a typical granite mineralogy with abundant quartz; potassium feldspar predominant over Plagioclase; and minor hornblende, biotite, and muscovite. X-ray fluorescence and instrumental neutron activation analysis of the granite show a high normative Or content and high K2O/Na2O (>1.5), Ce^/YbN (10.8), Rb/Sr (1-1.5), and Ba/Sr (9-12) ratios. The chemistry of Site 476 granite is typical of a calc-alkaline granite, albeit one that perhaps has been emplaced some distance away from the original trench/subduction zone system. The granite is probably an extension of the Mesozoic arc terrain exposed on Cabo San Lucas and north of Bahia Sebastian Viscaino.

Petrology and Geochemistry of Granite Recovered at Site 476, Deep Sea Drilling Project Leg 64, Gulf of California