Petrology, geochemistry, and geodynamics at DSDP Hole 66-493

Herve Bellon, R C Maury & J F Stephan
At Site 493, DSDP Leg 66, dioritic basement was reached below lower Miocene (NN1 Zone, 22-24 Ma) terrigenous sediments. Petrographical, mineralogical (including microprobe analyses), and chemical features of the dioritic rocks reveal their magmatic affinity with the calc-alkaline series. Furthermore, their radiometric age (35.3 m.y.) links the basement to the Sierra Madre Occidental in Mexico and to mid-Tertiary volcanic arcs in Central America. The presence of Oligocene diorite 50 km from the trench axis confirms...
This data repository is not currently reporting usage information. For information on how your repository can submit usage information, please see our documentation.