Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India

doi:10.1002/gj.3394

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	Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India
	Khan, Sahroz 4; Dongre, Ashish 3,4; Viljoen, Fanus 3; Li, Qiu-Li 2; Le Roux, Petrus 1
刊名	GEOLOGICAL JOURNAL
	2019-09-01
卷号	54 期号:5 页码:2994-3016
关键词	geochemistry kimberlite lamprophyre petrogenesis Wajrakarur kimberlite field
ISSN号	0072-1050
DOI	10.1002/gj.3394
英文摘要	Kimberlite field is an example of widespread Mesoproterozoic intracontinental magmatism. Recent studies have identified deep subcontinental lithospheric mantle as a source region of the kimberlite magmatism while timing, origin, and processes responsible for the generation of coeval lamprophyres remain poorly constrained. Here, we present and discuss new petrological and geochemical data for two lamprophyre dykes from the Wajrakarur kimberlite field and assess their petrogenetic relation to the kimberlite occurrences. Based on mineral compositional and whole-rock geochemical characters, it is suggested that lamprophyres are formed through low degrees of partial melting of "enriched" lithospheric mantle that was modified and metasomatized by melts derived from recycled crust. This differs from geochemical imprints found in coeval kimberlites, where a crustal source component appears to be absent and is more consistent with rock derivation from "depleted" lithosphere which has experienced interaction with asthenosphere-derived melts. An apparent lack of garnet in the mantle sources of lamprophyres is suggestive of melting at comparatively shallow depth (~100 km) relative to the kimberlites. Hence, these geochemically contrasting rocks, although have formed at the same time, are derived from vertically heterogeneous lithospheric mantle sources and can be explained through and linked with a thermal anomaly in the underlying convective asthenosphere. We suggest that the deeper mantle source region of the kimberlites was more pristine and devoid of subduction-related signatures, whereas the shallower mantle source region of the lamprophyres seems to have preserved imprints of plate convergence and subduction associated with the evolution of the Dharwar Craton.
WOS关键词	PRAKASAM ALKALINE PROVINCE ; ANDHRA-PRADESH ; ECLOGITE XENOLITHS ; CONTINENTAL-CRUST ; GREENSTONE-BELT ; RIFT-ZONE ; GEOCHEMISTRY ; CONSTRAINTS ; MAGMATISM ; ISOTOPE
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000487063800012
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93927]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Dongre, Ashish
作者单位	1.Univ Cape Town, Dept Geol, Rondebosch, South Africa 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 3.Univ Johannesburg, Dept Geol, Auckland Pk, South Africa 4.Savitribai Phule Pune Univ, Dept Geol, Pune, Maharashtra, India
推荐引用方式 GB/T 7714	Khan, Sahroz,Dongre, Ashish,Viljoen, Fanus,et al. Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India[J]. GEOLOGICAL JOURNAL,2019,54(5):2994-3016.
APA	Khan, Sahroz,Dongre, Ashish,Viljoen, Fanus,Li, Qiu-Li,&Le Roux, Petrus.(2019).Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India.GEOLOGICAL JOURNAL,54(5),2994-3016.
MLA	Khan, Sahroz,et al."Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India".GEOLOGICAL JOURNAL 54.5(2019):2994-3016.