Geochemistry and petrogenesis of mafic-ultramafic rocks from the Central Indian Ridge, latitude 8 degrees-17 degrees S: denudation of mantle harzburgites and gabbroic rocks and compositional variation of basalts SCIE SCOPUS

Cited 12 time in WEB OF SCIENCE Cited 13 time in Scopus
Title
Geochemistry and petrogenesis of mafic-ultramafic rocks from the Central Indian Ridge, latitude 8 degrees-17 degrees S: denudation of mantle harzburgites and gabbroic rocks and compositional variation of basalts
Author(s)
Yi, Sang-Bong; Oh, Chang-Whan; Pak, Sang Joon; Kim, Jonguk; Moon, Jai-Woon
KIOST Author(s)
Pak, Sang Joon(박상준)Kim, Jonguk(김종욱)Moon, Jai Woon(문재운)
Publication Year
2014-10-26
Abstract
This study investigates the formation of lower oceanic crust and geochemical variations of basalts along the Central Indian Ridge (CIR, lat. 7 degrees 45 '-17 degrees 10 ' S). Harzburgites, various gabbroic cumulates, medium- to fine-grained oxide gabbros, diabases, and pillow basalts were recovered by dredging from segment ends such as ridge-transform intersections (RTIs), non-transform discontinuities (NTDs), and transform offset areas. The occurrence of both harzburgites and gabbroic rocks with minor basalts at all segments ends, and leucogabbro intrusive into harzburgite at the 12 degrees 45 ' S NTD indicates that oceanic crust at segment ends exposes mantle-derived harzburgites and gabbroic intrusions with a thin basaltic cover due to sparse magmatic activity. Basalts collected along the entire ridge show wide compositional variations between N (normal)- and E (enriched)-mid-ocean ridge basalt (MORB). T (transitional)-MORBs with enriched affinities are more prominent than N-MORBs. There is no tendency of enrichment towards specific directions. (La/Sm)(N) variations in MORB along the CIR (8 degrees-21 degrees S) fluctuates at a regional scale with local high positive anomalies reflecting compositional heterogeneity of the sub-CIR mantle domain.
ISSN
0020-6814
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2691
DOI
10.1080/00206814.2014.955539
Bibliographic Citation
INTERNATIONAL GEOLOGY REVIEW, v.56, no.14, pp.1691 - 1719, 2014
Publisher
TAYLOR & FRANCIS INC
Subject
MID-ATLANTIC RIDGE; RODRIGUEZ TRIPLE JUNCTION; SLOW-SPREADING RIDGE; OCEAN-RIDGE; ABYSSAL PERIDOTITES; CORE COMPLEXES; SEA-FLOOR; CARLSBERG RIDGE; FRACTURE-ZONE; BENEATH
Keywords
Central Indian Ridge; harzburgite; lower crust denudation; cumulates; MORB
Type
Article
Language
English
Document Type
Article
Publisher
TAYLOR & FRANCIS INC
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse