Secondary Minerals in Basalts from the Middle America Trench, Leg 67

Abstract

Secondary minerals in basalts from Holes 495 and 500 include smectite and chlorite, both of which have partially replaced the basalt groundmass. In addition to these two minerals, amphibole, laumontite, albite, and a corrensitelike mineral are present in Holes 499B and 499C. Smectite, chlorite, talc, calcite, phillipsite, mica, and mixed-layer chloritemontmorillonite also fill veins in the basalts of Hole 495. The secondary mineral assemblages from Site 499 are characteristic of the initial stage of greenschist facies metamorphism.

Deep-Sea Trenches of the Pacific Ocean: A Comparative Analysis of the Submarine Geomorphology Using Data Modeling by Gmt, Python and R

“…This explain the eruption of the transitional basalts as oceanic and island-arc tholeiites in theMAT. Secondary minerals of the basalts of MAT in studied transects include smectite and chlorite, as well as talc, calcite, phillipsite, mica, and mixed-layer chlorite-montmorillonite also fill veins in the basalts of the trench [346].…”