Petrology of the basaltic rocks of the Nankai Trough basement

F. Siena, M. Coltorti, E. Saccani, C. Vaccaro

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Major- and trace-element analyses, mineral chemistry, and Sr-Nd isotopic determinations were obtained on representative igneous rocks drilled from the Nanikai accretionary complex (Site 808) during Ocean Drilling Program Leg 131. For the first time, the oceanic basement of the subducting plate below an accretionary prism has been reached. Two main lithological units have been distinguished from the top downward; sill-like rocks and pillow lavas. Basalts are predominantly nonvesicular, hypocrystalline, aphyric to slightly phyric with intersertal to intergranular textures. Alteration is generally slight to moderate. All the basaltic rocks are cut by ramifying veins of varying widths. Secondary mineral assemblages (including vein fillings) are typical of submarine alteration and zeolite to low greenschist facies metamorphism. Stratigraphy, petrography, and geochemistry of the basaltic rocks recovered at Site 808 appear very similar to those from the Shikoku Basin basement, analogously identified as normal MORB. -from Authors

Original languageEnglish
Pages (from-to)197-207
Number of pages11
JournalAmerican Society of Mechanical Engineers (Paper)
Publication statusPublished - 1993

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