干旱区生态环境知识资源中心(Arid): Alteration of primary Cr-spinel mineral composition from the Suru Valley ophiolitic peridotites, Ladakh Himalaya: Their low-temperature metamorphic implications

Arid

DOI	10.1007/s12040-019-1222-6
	Alteration of primary Cr-spinel mineral composition from the Suru Valley ophiolitic peridotites, Ladakh Himalaya: Their low-temperature metamorphic implications
	Bhat, I. M.1; Ahmad, T.2; Rao, D. V. Subba 3
通讯作者	Bhat, I. M.
来源期刊	JOURNAL OF EARTH SYSTEM SCIENCE
ISSN	2347-4327
EISSN	0973-774X
出版年	2019
卷号	128 期号:7
英文摘要	The present study focuses on the chemical modification of a Cr-spinel from the Suru Valley ophiolitic peridotites exposed near Trespone Village of Kargil district, Ladakh Himalaya. The Suru Valley peridotite is partially serpentinised with the preservation of the spinel and relics of olivine and pyroxene. These peridotites contain characteristic red-brown spinel grains of corroded grain boundaries. While analysing these grains for mineral chemistry, compositional variation was observed with Cr-rich cores rimmed by Cr-poor compositions. Secondary spinel compositions, i.e., ferritchromite and magnetite were observed along the margins and cracks of primary Cr-spinel grains. The primary Cr-spinel cores are identified as Cr-rich and are characterised by higher values of Cr3+# (0.5-0.6) and lower values of Al3+# (0.42-0.54). From primary spinel cores to altered rims it was observed that Cr3+# and Fe3+# increase while Mg2+# decreases due to Mg2+-Fe2+ and Al3+-Fe3+ exchange with surrounding silicates of host peridotite during alteration. On the basis of present spinel mineral chemistry, metamorphic alteration conditions were transitional between greenschist and lower amphibolite similar to most of the Neo-Tethyan ophiolite peridotites.
英文关键词	Indus suture zone Suru Valley ophiolite peridotites metamorphism Cr-spinel
类型	Article
语种	英语
国家	India
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000474569900009
WOS关键词	INDUS SUTURE ZONE ; SOUTH EASTERN DESERT ; BOU-AZZER OPHIOLITE ; ABYSSAL PERIDOTITES ; CHROMIAN SPINEL ; TETHYAN OPHIOLITES ; NW HIMALAYA ; SERPENTINIZED PERIDOTITES ; NEOPROTEROZOIC OPHIOLITE ; HYDROTHERMAL ALTERATION
WOS类目	Geosciences, Multidisciplinary ; Multidisciplinary Sciences
WOS研究方向	Geology ; Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216924
作者单位	1.Univ Kashmir, Dept Earth Sci, Srinagar 190006, Jammu & Kashmir, India; 2.Univ Kashmir, Vice Chancellors Off, Srinagar 190006, Jammu & Kashmir, India; 3.NGRI, Geochem Div, Hyderabad 500606, India
推荐引用方式 GB/T 7714	Bhat, I. M.,Ahmad, T.,Rao, D. V. Subba. Alteration of primary Cr-spinel mineral composition from the Suru Valley ophiolitic peridotites, Ladakh Himalaya: Their low-temperature metamorphic implications[J],2019,128(7).
APA	Bhat, I. M.,Ahmad, T.,&Rao, D. V. Subba.(2019).Alteration of primary Cr-spinel mineral composition from the Suru Valley ophiolitic peridotites, Ladakh Himalaya: Their low-temperature metamorphic implications.JOURNAL OF EARTH SYSTEM SCIENCE,128(7).
MLA	Bhat, I. M.,et al."Alteration of primary Cr-spinel mineral composition from the Suru Valley ophiolitic peridotites, Ladakh Himalaya: Their low-temperature metamorphic implications".JOURNAL OF EARTH SYSTEM SCIENCE 128.7(2019).