Chemical composition of ultrabasite and gabbro from the rift zones of the Arabian-Indian and Western Indian ridges, supplement to: Chernysheva, Victoria I (1969): Ultrabasite and gabbro from the rift zones of the Arabian-Indian and Western Indian underwater ridges. Oceanology, 9, 519-528

DOI

Results of petrographic studies of ultrabasite and gabbro from the rift zones of the Indian Ocean ridges are discussed using materials of R/V Vityaz Cruise 36. Rocks sampled from two sites 2700 km apart are close to each other in their composition. Petrographically ultrabasic rocks are divided into four subgroups: I - dunite; II - harzburgite, serpentinite; III - plagioclase lherzolite; and IV - metamorphically altered rocks. Petrographic description and chemical composition of basic rock varieties are presented as well as description of rock-forming minerals and their optical properties. Formation of pyroxene and plagioclase is shown to be related to autometasomatosis, which concludes the magmatic phase proper in rock mass formation accompanied by activity of residual intragranular liquid. Formation of ultrabasite in the rift zones is related to complicated processes.

Identifier
DOI https://doi.org/10.1594/PANGAEA.754462
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.754462
Provenance
Creator Chernysheva, Victoria I
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1969
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Collection of Datasets; Collection
Format application/zip
Size 2 datasets
Discipline Earth System Research
Spatial Coverage (62.142W, -28.367S, 68.665E, 5.413N)
Temporal Coverage Begin 1960-10-15T00:00:00Z
Temporal Coverage End 1964-12-21T00:00:00Z