Zircon U-Pb-Hf isotopes constraints on the petrogenesis of Neoarchean granitic rocks from the Northeastern part of the Eastern Dharwar Craton, Southern India
文献类型：期刊论文
| 作者 | Raju, B. Vikram2,3; Asokan, Ajay Dev2; Xia, Xiao-Ping4; Cui, Zexian1; Panicker, Arathi G.2,3; Mohan, M. Ram2,3 |
| 刊名 | LITHOS
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 488页码:19 |
| 关键词 | Archean subduction Continent-continent collision Metasomatized mantle Crustal reworking Sanukitoids Zircon hafnium isotopes |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2024.107807 |
| 英文摘要 | In the present study, we integrate bulk rock chemistry and in-situ zircon U-Pb-Hf isotopes of high-K Neoarchean granitoids from the northeastern part of the Eastern Dharwar Craton (EDC) to investigate their source, petrogenesis, and plausible tectonic setting. Based on the mineral assemblage, in coherence with their geochemical characteristics, these granitoids are classified as Hornblende-biotite granite (HBG) with Microgranular enclaves (ME), Biotite granite (BTG) and Monzogranite (MG). Field observations and zircon U-Pb ages reveal coeval emplacement of these granitoids between 2.53 and 2.50 Ga. The HBG, including ME, has low silica, metaluminous affinity, and high ferromagnesian element content, consistent with their derivation from a mafic source. Some of the HBG and ME samples are strongly enriched in incompatible elements, similar to the sanukitoids. The geochemical attributes and strongly evolved zircon Hf isotopic compositions (epsilon Hf(t) = -4.3 to +1.8 and -7.3 to +0.2) of the HBG and ME suggest their derivation from a mantle source metasomatized by subducted sediments. The BTG and MG are compositionally similar, with high silica, low ferromagnesian element content, and moderate peraluminous affinity, suggesting the involvement of felsic crustal sources. The sub-chondritic to chondritic zircon Hf isotopic compositions (epsilon Hf(t) = -2.7 to +1.4 and -6.9 to +1.9) of these granitoids support the involvement of heterogeneous ancient crustal sources. While all granitoids exhibit similar zircon Hf isotopic compositions, their geochemical attributes suggest distinct sources. The HBG reflects juvenile crustal additions, whereas BTG and MG are products of the crustal reworking. We propose that these granitoids formed during the continent-continent collision between Western and Eastern Dharwar cratons, that took place after the break-off of the eastward subducting slab. The asthenospheric upwelling induced by slab break-off and/or lithospheric delamination of thickened crust led to the genesis of metasomatized mantle derived magma, which drove the crustal reworking. The observed zircon Hf isotopic composition of the EDC granitoids are similar to the present day Phanerozoic Alpine-Himalayan type orogenies supporting subduction followed by continental collision model for the stabilisation of Archean cratons. Evidence for the existence of Paleo- Mesoarchean felsic crust from this part of the EDC warrants further studies to test the three-terrane model for the Dharwar Craton. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001335375000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81237]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Mohan, M. Ram |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Natl Geophys Res Inst, CSIR, Hyderabad, India 3.Acad Sci & Innovat Res AcSIR, Ghaziabad 201002, India 4.Yangtze Univ, Coll Resources & Environm, Hubei Key Lab Petr Geochem & Environm, Wuhan 430100, Peoples R China |
| 推荐引用方式 GB/T 7714 | Raju, B. Vikram,Asokan, Ajay Dev,Xia, Xiao-Ping,et al. Zircon U-Pb-Hf isotopes constraints on the petrogenesis of Neoarchean granitic rocks from the Northeastern part of the Eastern Dharwar Craton, Southern India[J]. LITHOS,2024,488:19. |
| APA | Raju, B. Vikram,Asokan, Ajay Dev,Xia, Xiao-Ping,Cui, Zexian,Panicker, Arathi G.,&Mohan, M. Ram.(2024).Zircon U-Pb-Hf isotopes constraints on the petrogenesis of Neoarchean granitic rocks from the Northeastern part of the Eastern Dharwar Craton, Southern India.LITHOS,488,19. |
| MLA | Raju, B. Vikram,et al."Zircon U-Pb-Hf isotopes constraints on the petrogenesis of Neoarchean granitic rocks from the Northeastern part of the Eastern Dharwar Craton, Southern India".LITHOS 488(2024):19. |
入库方式： OAI收割
来源：广州地球化学研究所
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