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Morphotectonic and petrological variations along the southern Central Indian Ridge

Content Provider	Springer Nature Link
Author	Mukhopadhyay, Ranadhir Iyer, Sridhar D. Ray, Dwijesh Karisiddaiah, S. M. Drolia, Rajendra K.
Copyright Year	2015
Abstract	In order to ascertain the effect of geomorphic and tectonic domains on the formation, enrichment, and ascension of the ridge axis melt, structural and petrological data from a nearly 300-km-long axial stretch along the slow-to-intermediate-spreading (40–60 mm/year) southern Central Indian Ridge (SCIR) were studied. The stretch, approximately between 20°30′S and 23°07′S, was disturbed by two major tectonic features—Egeria transform fault in the north and the Gemino Fracture Zone in the south—besides eight other discontinuities of variable dimensions. This stretch was chosen to test the petrological variations and mechanisms of magma supply in four distinct geomorphic and tectonic regimes: a Ridge-Crest-Flank-Valley (RCFV), a Neo-Volcanic Zone (NVZ), a large transform discontinuity (LTD), and an overlapping spreading centre (OSC). The major and trace element geochemistry of 44 glass and 47 whole rocks, extent and depth of melting (Na8 and Fe8, respectively), and melt pristinity (Mg#) of the magma indicate that rocks along this stretch were probably sourced from a reasonably primitive melt generated at a relatively greater depth and later got accumulated in pockets at a shallower level before eruption. Petrochemical analysis, and isotopic composition and ratios suggest that in contrast to largely N-MORB type of rocks at RCFV and OSC areas, the rocks from LTD and NVZ locations show signatures of enrichment to transitional (T) and enriched (E) basalts. A model explaining possible processes of enrichment and ascending framework of the melt at different tectonic regimes along SCIR are discussed.
Starting Page	905
Ending Page	920
Page Count	16
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	105
Issue Number	3
e-ISSN	14373262
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-06-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Southern Central Indian Ridge Overlapping spreading centre Neo-Volcanic Zone Ridge-transform fault intersection Ascending magma framework Geology Geophysics/Geodesy Sedimentology Structural Geology Mineral Resources Geochemistry
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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