| Tectono-magmatic evolution of Late Jurassic to Early Cretaceous granitoids in the west central Lhasa subterrane, Tibet | |
| Cao, MJ (Cao, MingJian)1,2; Qin, KZ (Qin, KeZhang)1,5; Li, GM (Li, GuangMing)1,5; Li, JX (Li, JinXiang)3,5; Zhao, JX (Zhao, JunXing)1; Evans, NJ (Evans, Noreen J.)4; Hollings, P (Hollings, Pete)2; Qin, KZ | |
| Source Publication | GONDWANA RESEARCH
 |
| 2016 | |
| Volume | 39Issue:0Pages:386-400 |
| DOI | 10.1016/j.gr.2016.01.006 |
| Abstract | There is ongoing debate as to the subduction direction of the Bangong-Nujiang Ocean during the Mesozoic (northward, southward or bidirectional subduction). Arc-related intermediate to felsic intrusions could mark the location of the subduction zone and, more importantly, elucidate the dominant geodynamic processes. We report whole rock geochemical and zircon U-Pb and Hf isotopic data for granitoids from the west central Lhasa subterrane (E80 degrees to E86 degrees). All rocks show metaluminous to peraluminous, calc-alkaline signatures, with strong depletion of Nb, Ta and Ti, enrichment of large ion lithophile elements (e.g., Cs, Rb, K), a negative correlation between SiO2 and P2O5, and a positive correlation between Rb and Th. All these features are indicative of I-type arc magmatism. New zircon U-Pb results, together with data from the literature, indicate continuous magmatism from the Late Jurassic to the Early Cretaceous (160 to 130 Ma). Zircon U-Pb ages for samples from the northern part of the west central Lhasa subterrane (E80 degrees to E82 degrees 30') yielded formation ages of 165 to 150 Ma, whereas ages of 142 to 130 Ma were obtained on samples from the south. This suggests flat or low-angle subduction of the Bangong-Nujiang Ocean, consistent with a slight southward decrease in zircon epsilon Hf(t) values for Late Jurassic rocks. Considering the crustal shortening, the distance from the Bangong-Nujiang suture zone, and a typical subduction zone melting depth of similar to 100 km, the subduction angle was less than 14 degrees for Late Jurassic magmatism in the central Lhasa interior, consistent with flat or low-angle subduction. Compared with Late Jurassic rocks (main eHf(t) values of -16 to -7), Early Cretaceous rocks (145 to 130 Ma) show markedly higher eHf(t) values (mainly-8 to 0), possibly indicating slab roll-back, likely caused by slab foundering or break-off. Combined with previously published works on arc magmatism in the central Lhasa and west part of the southern Qiangtang subterranes, our results support the bidirectional subduction of the Bangong-Nujiang Ocean along the Bangong-Nujiang Suture Zone, and indicates flat or low-angle southward subduction (165 to 145Ma) followed by slab roll-back (145 to 130 Ma). (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
| Subject Area | 地质学 |
| WOS ID | WOS:000397872900022 |
| Language | 英语 |
| Indexed By | SCI |
| Keyword | U-pb Geochronology Hf Isotopic Constraints Porphyry Copper-deposit Tertiary Igneous Rocks A-type Granites Southern Tibet Volcanic-rocks Lu-hf Flat Subduction Trace-element |
| Cooperation Status | 国际 |
| Department | 碰撞与隆升 |
| Subtype | Article |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itpcas.ac.cn/handle/131C11/7500 |
| Collection | 图书馆 |
| Corresponding Author | Qin, KZ |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China 2.Lakehead Univ, Dept Geol, 955 Oliver Rd, Thunder Bay P7B 5E1, ON, Canada 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China 4.Curtin Univ, TIGeR, John Laeter Ctr, Dept Appl Geol, Perth, WA 6945, Australia 5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100085, Peoples R China |
| Recommended Citation GB/T 7714 | Cao, MJ ,Qin, KZ ,Li, GM ,et al. Tectono-magmatic evolution of Late Jurassic to Early Cretaceous granitoids in the west central Lhasa subterrane, Tibet[J]. GONDWANA RESEARCH,2016,39(0):386-400. |
| APA | Cao, MJ .,Qin, KZ .,Li, GM .,Li, JX .,Zhao, JX .,...&Qin, KZ.(2016).Tectono-magmatic evolution of Late Jurassic to Early Cretaceous granitoids in the west central Lhasa subterrane, Tibet.GONDWANA RESEARCH,39(0),386-400. |
| MLA | Cao, MJ ,et al."Tectono-magmatic evolution of Late Jurassic to Early Cretaceous granitoids in the west central Lhasa subterrane, Tibet".GONDWANA RESEARCH 39.0(2016):386-400. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| V.39 386-400 2016.pd（4478KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment