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The newly-discovered Late Cretaceous igneous rocks in the Nuocang district: Products of ancient crust melting trigged by Neo-Tethyan slab rollback in the western Gangdese
Jiang, Jun-Sheng1; Zheng, You-Ye1,2; Gao, Shun-Bao1; Zhang, Yong-Chao1; Huang, Jian4; Liu, Jun1; Wu, Song2; Xu, Jing3; Huang, Liang-Liang3
2018-05-01
发表期刊LITHOS
ISSN0024-4937
卷号308页码:294-315
摘要The newly discovered polymetallic Nuocang Pb-Zn skarn deposit is located in the southern Lhasa subterrane, western Gangdese, Tibet. The orebodies occur primarily at the contact zone between the Angjie Formation and the Linzizong volcanic rocks of Dianzhong Formation (LDF) that are dominated by basaltic andesitic tuff and rhyolite. Zircon U-Pb dating for two granite porphyries yield ages of 72.4 +/- 0.2 Ma and 73.4 +/- 0.9 Ma, which are different from the ages (similar to 69-60 Ma) of the LDF in the eastern Gangdese. The basaltic andesite tuff at Nuocang exhibits enrichment of MgO, TiO2, LILE, and LREE, with a relative depletion of SiO2, K2O, HFSE, and HREE, low Sr/Y ratios (32.9-38.0), and weak negative Eu anomalies (mean 0.86). They have Sr-87/Sr-86((i)) from 0.70695 to 0.70807 and epsilon(Nd(t)) values between -4.3 and -5.9.These features are similar to the Linzizong volcanic rocks of Dianzhong Formation in the Linzhou basin, indicating that they were associated with partial melting of mantle wedge mixing with 25-35% ancient Lhasa terrane basement. The rhyolite and granite porphyry show high SiO2 and K2O, and low Sr/Y ratio (1.2-9.9), enrichment of LILE and LREE and strong depletion of the HFSEs. They have pronounced negative Eu anomalies (mean 0.46), and epsilon(Hf (t)) values of the granite porphyry zircons range from -22.0 to -6.0. All these features suggest that they are the product of anatexis of ancient crustal materials heated by mantle-derived magma, the latter derived from Neo-Tethyan slab dehydration mechanisms. Combined with the previous geochronological and geochemical data, we proposed that the Nuocang district of western Gangdese in the southern Lhasa subterrane contains an ancient block, and the igneous rocks here were triggered by the Neo-Tethyan slab rollback starting at similar to 82 Ma. The western Gangdese contains more ancient continental crustal materials and Late Cretaceous-Eocene Linzizong volcanic rocks and coeval intrusions than in the eastern Gangdese. Thus the western Gangdese block displays greater potential for deposits associated with Late Cretaceous-Eocene magmatism including porphyry Mo, polymetallic skarn (W-Sn-Mo-Pb-Zn-Ag), base and precious metal epithermal (Pb-Zn-Ag-Au), cryptoexplosive breccia (Pb-Zn-Ag), and hydrothermal vein PbZn-Ag deposits. (C) 2018 Elsevier B.V. All rights reserved.
关键词Linzizong volcanic rocks Granite porphyry Nuocang Western Gangdese belt Tibet
DOI10.1016/j.lithos.2018.03.009
资助者National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey
关键词[WOS]LINZIZONG VOLCANIC SUCCESSIONS ; SOUTHERN TIBET IMPLICATIONS ; MIDOCEAN RIDGE SUBDUCTION ; PORPHYRY CU-MO ; U-PB ; LHASA TERRANE ; CONTINENTAL-CRUST ; METALLOGENIC BELT ; TRACE-ELEMENT ; GEOCHEMICAL CHARACTERISTICS
语种英语
资助项目National Key Research and Development Program of China[2016YFC0600300] ; Commonwealth Project from the Ministry of Land and Resources[201511015] ; China Geological Survey[DD20160027-2]
资助者National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Commonwealth Project from the Ministry of Land and Resources ; Commonwealth Project from the Ministry of Land and Resources ; China Geological Survey ; China Geological Survey
WOS研究方向Geochemistry & Geophysics ; Mineralogy
WOS类目Geochemistry & Geophysics ; Mineralogy
WOS记录号WOS:000446791000019
出版者ELSEVIER SCIENCE BV
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89184
专题其他部门
通讯作者Zheng, You-Ye
作者单位1.China Univ Geosci, Fac Earth Resources, Inst Geol Survey, Wuhan 430074, Hubei, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, State Key Lab Geol Proc & Resources, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China
4.East China Met Inst Geol & Explorat, Hefei 230088, Anhui, Peoples R China
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Jiang, Jun-Sheng,Zheng, You-Ye,Gao, Shun-Bao,et al. The newly-discovered Late Cretaceous igneous rocks in the Nuocang district: Products of ancient crust melting trigged by Neo-Tethyan slab rollback in the western Gangdese[J]. LITHOS,2018,308:294-315.
APA Jiang, Jun-Sheng.,Zheng, You-Ye.,Gao, Shun-Bao.,Zhang, Yong-Chao.,Huang, Jian.,...&Huang, Liang-Liang.(2018).The newly-discovered Late Cretaceous igneous rocks in the Nuocang district: Products of ancient crust melting trigged by Neo-Tethyan slab rollback in the western Gangdese.LITHOS,308,294-315.
MLA Jiang, Jun-Sheng,et al."The newly-discovered Late Cretaceous igneous rocks in the Nuocang district: Products of ancient crust melting trigged by Neo-Tethyan slab rollback in the western Gangdese".LITHOS 308(2018):294-315.
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