Chemical composition of ultrabasites and gabbro from rift zones of the Indian Ocean, 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


Results of petrographic studies of ultrabasites and gabbro from rift zones of the Indian Ocean are discussed using materials of Cruise 36 of R/V Vityaz. 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. Formation of ultrabasite in rift zones is related to complicated processes.

Metadata Access
Creator Chernysheva, Victoria I
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1969
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
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