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Evidence of sub-continental lithospheric mantle sources and open-system crystallization processes from in-situ U-Pb ages and Nd-Sr-Hf isotope geochemistry of the Cretaceous ultramafic-alkaline-(carbonatite) intrusions from the Shillong Plateau, north-eastern India

文献类型：期刊论文

作者Srivastava, Rajesh K.1; Guarino, Vincenza2; Wu, Fu-Yuan3; Melluso, Leone2; Sinha, Anup K.4
刊名LITHOS
出版日期2019-04-01
卷号330页码:108-119
关键词Ultramafic-alkaline-(carbonatite) intrusions in-situ U-Pb ages Sr-Nd-Hf isotopes Petrogenesis Shillong Plateau North-Eastern India
ISSN号0024-4937
DOI10.1016/j.lithos.2019.02.009
英文摘要New in-situ U-Pb ages and Sr-Nd-Hf isotopic data on mineral phases of the Sung Valley and Jasra ultramaficalkaline-(carbonatite) intrusions (Shillong Plateau, India) shed new light on the petrogenetic processes of volcanism in north-eastern India during the Cretaceous. Perovskites of Sung Valley dunite, ijolite and uncompahgrite yielded U-Pb ages of 109.1 +/- 1.6,104.0 +/- 1.3 and 101.7 +/- 3.6 Ma, respectively. A U-Pb age of 106.8 +/- 1.5 Ma was obtained on zircons of a Sung Valley nepheline syenite. Perovskite of a Jasra clinopyroxenite yielded an age of 101.6 +/- 1.2 Ma, different from the U-Pb age of 106.8 +/- 0.8 Ma on zircon of Jasra syenites. The variation in SrNd-Hf isotopic compositions [initial Sr-87/Sr-86 = 0.70472 to 0.71080; epsilon(Nd i)= -10.85 to +0.86; epsilon(Hf)( i)= -7.43 to +1.52] matches the bulk-rock isotopic composition of the different rock units of Sung Valley and Jasra. Calcite and apatite in the carbonatites, the perovskite in a dunite, and the bulk-rock carbonatites of Sung Valley intrusion have the lowest initial Sr-87/Sr-86 and epsilon(Nd), taken to be the best proxies of the mantle source composition, which is dominated by components derived from the lithospheric mantle. The alkaline intrusions of north-eastem India are significantly younger than the Sylhet tholeiitic magmatism. The silicate rocks of both intrusions have isotopic composition trending to that of the underlying Shillong crust, indicating the effects of fractional crystallization and low-pressure crustal contamination during the emplacement of the various intrusive magma pulses. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词ALKALINE-CARBONATITE COMPLEX ; ULTRAMAFIC-MAFIC COMPLEX ; SUNG VALLEY ; TRACE-ELEMENT ; TH-PB ; NORTHEASTERN INDIA ; KERGUELEN PLUME ; AR-40/AR-39 GEOCHRONOLOGY ; PETROGENETIC EVOLUTION ; MASS-SPECTROMETRY
资助项目DST-PURSE grant (Scheme 5050) ; UGC-CAS-II grant (Scheme 5055)
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000463129600007
出版者ELSEVIER SCIENCE BV
资助机构DST-PURSE grant (Scheme 5050) ; DST-PURSE grant (Scheme 5050) ; UGC-CAS-II grant (Scheme 5055) ; UGC-CAS-II grant (Scheme 5055) ; DST-PURSE grant (Scheme 5050) ; DST-PURSE grant (Scheme 5050) ; UGC-CAS-II grant (Scheme 5055) ; UGC-CAS-II grant (Scheme 5055) ; DST-PURSE grant (Scheme 5050) ; DST-PURSE grant (Scheme 5050) ; UGC-CAS-II grant (Scheme 5055) ; UGC-CAS-II grant (Scheme 5055) ; DST-PURSE grant (Scheme 5050) ; DST-PURSE grant (Scheme 5050) ; UGC-CAS-II grant (Scheme 5055) ; UGC-CAS-II grant (Scheme 5055)
源URL[http://ir.iggcas.ac.cn/handle/132A11/91090]  
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Guarino, Vincenza
作者单位1.Banaras Hindu Univ, Ctr Adv Study, Dept Geol, Varanasi 221005, Uttar Pradesh, India
2.Univ Napoli Federico II, Dipartimento Sci Terra Ambiente & Risorse, Complesso Univ Monte St Angelo,Ed L,Via Cintia 26, I-80126 Naples, Italy
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Indian Inst Geomagnetism, Dr KS Krishnan Geomagnet Res Lab, Allahabad 211505, Uttar Pradesh, India
推荐引用方式
GB/T 7714		 Srivastava, Rajesh K.,Guarino, Vincenza,Wu, Fu-Yuan,et al. Evidence of sub-continental lithospheric mantle sources and open-system crystallization processes from in-situ U-Pb ages and Nd-Sr-Hf isotope geochemistry of the Cretaceous ultramafic-alkaline-(carbonatite) intrusions from the Shillong Plateau, north-eastern India[J]. LITHOS,2019,330:108-119.
APA Srivastava, Rajesh K.,Guarino, Vincenza,Wu, Fu-Yuan,Melluso, Leone,&Sinha, Anup K..(2019).Evidence of sub-continental lithospheric mantle sources and open-system crystallization processes from in-situ U-Pb ages and Nd-Sr-Hf isotope geochemistry of the Cretaceous ultramafic-alkaline-(carbonatite) intrusions from the Shillong Plateau, north-eastern India.LITHOS,330,108-119.
MLA Srivastava, Rajesh K.,et al."Evidence of sub-continental lithospheric mantle sources and open-system crystallization processes from in-situ U-Pb ages and Nd-Sr-Hf isotope geochemistry of the Cretaceous ultramafic-alkaline-(carbonatite) intrusions from the Shillong Plateau, north-eastern India".LITHOS 330(2019):108-119.

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来源：地质与地球物理研究所

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