干旱区生态环境知识资源中心(Arid): The mafic-ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan-type complex

Arid

DOI	10.1002/gj.3460
	The mafic-ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan-type complex
	Yellappa, Thoti 1; Santosh, M.2,3; Manju, S.1
通讯作者	Yellappa, Thoti
来源期刊	GEOLOGICAL JOURNAL
ISSN	0072-1050
EISSN	1099-1034
出版年	2019
卷号	54 期号:5 页码:3017-3040
英文摘要	The Salem Mafic-Ultramafic Complex occurs within the northern part of Cauvery Suture Zone (CSZ), Southern Granulite Terrane (SGT), India. The complex occurs as semicircular to elongated linear body with a thick mantle section and comparatively well-developed crustal section comprising different lithological units, also referred to as the Chalk Hills of Salem. The major rock types in the complex comprise ultramafic cumulates of dunite, peridotite, wherlite, pyroxenite, and hornblendite, mafic and felsic intrusions of gabbros and amphibolites, and quartzo-feldspathic alkaline rocks together with several ultrapotassic dykes. Geochemical studies of amphibolites from this complex indicate tholeiitic parent magma with enrichment of LIL elements (Rb, Ba, Th, and Sr) and are relatively more enriched than N-MORB as compared with arc-related rocks. The enrichment of LIL elements over the HFS elements and with distinct Nb, Ta, and Ti depletion relative to other HFS elements suggest the involvement of subduction-related components in the depleted mantle source and that the magmatism occurred in an oceanic convergent realm. The mineral chemistry of dunite and peridotite shows high content of forsterite (86.9-92.2) in olivine and high Cr# value (80.85-98.73) for spinel. The tectonic discrimination plots of spinel and olivine mineral chemistry together with clinopyroxene chemistry of amphibolites reveal arc signature typical of Alaskan type of complex. The U-Pb zircon analysis of quartz monzonite intrusion within the hornblendite from the complex yielded a weighted mean age of 819 +/- 2.4 Ma, suggesting that the complex formed during the Neoproterozoic and can be correlated to the Alaskan-type complexes described from the Arabian-Nubian Shield.
英文关键词	Alaskan type of complex Cauvery Suture Zone island-arc signature Salem Mafic-Ultramafic Complex Southern Granulite Terrane
类型	Article
语种	英语
国家	India ; Peoples R China ; Australia
收录类别	SCI-E
WOS记录号	WOS:000487063800013
WOS关键词	PLATINUM-GROUP MINERALS ; RARE-EARTH PATTERNS ; U-PB GEOCHRONOLOGY ; INTRUSIVE COMPLEXES ; PLACER DEPOSITS ; CHROMIAN SPINEL ; ISLAND-ARC ; CLINOPYROXENE COMPOSITION ; EASTERN DESERT ; VOLCANIC-ROCKS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215962
作者单位	1.CSIR, Natl Geophys Res Inst, Uppal Rd, Hyderabad, India; 2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Shaanxi, Peoples R China; 3.Univ Adelaide, Ctr Tecton Explorat & Res, Adelaide, SA, Australia
推荐引用方式 GB/T 7714	Yellappa, Thoti,Santosh, M.,Manju, S.. The mafic-ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan-type complex[J],2019,54(5):3017-3040.
APA	Yellappa, Thoti,Santosh, M.,&Manju, S..(2019).The mafic-ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan-type complex.GEOLOGICAL JOURNAL,54(5),3017-3040.
MLA	Yellappa, Thoti,et al."The mafic-ultramafic complex of Salem, southern India: An analogue for Neoproterozoic Alaskan-type complex".GEOLOGICAL JOURNAL 54.5(2019):3017-3040.