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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, Sahroz1; Dongre, Ashish1,2; Viljoen, Fanus2; Li, Qiu-Li3; Le Roux, Petrus4
2019-09-01
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume54Issue:5Pages:2994-3016
AbstractKimberlite 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.
Keywordgeochemistry kimberlite lamprophyre petrogenesis Wajrakarur kimberlite field
DOI10.1002/gj.3394
WOS KeywordPRAKASAM ALKALINE PROVINCE ; ANDHRA-PRADESH ; ECLOGITE XENOLITHS ; CONTINENTAL-CRUST ; GREENSTONE-BELT ; RIFT-ZONE ; GEOCHEMISTRY ; CONSTRAINTS ; MAGMATISM ; ISOTOPE
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000487063800012
PublisherWILEY
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93927
Collection岩石圈演化国家重点实验室
Corresponding AuthorDongre, Ashish
Affiliation1.Savitribai Phule Pune Univ, Dept Geol, Pune, Maharashtra, India
2.Univ Johannesburg, Dept Geol, Auckland Pk, South Africa
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.Univ Cape Town, Dept Geol, Rondebosch, South Africa
Recommended Citation
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.
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