The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa

Zhao, Jun‐Hong; Qin, Kezhang; Li, Guangming; Cao, MingJian; Evans, Noreen J.; McInnes, Brent; Li, Jinxiang; Xiao, Bo; Chen, Lei

doi:10.1016/j.oregeorev.2014.09.026

Cited by 39 publications

(18 citation statements)

References 80 publications

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“…Because of Jurassic–Cretaceous collision with the Qiangtang Terrane, the Lhasa Terrane internally shortened and achieved an eventual crustal thickness of 70–80 km, which is twice that of normal crust (Molnar et al ., ; Murphy et al ., ). Low‐temperature thermochronological studies suggest an increasing exhumation rate from Central Lhasa Terrane to Southern Lhasa Terrane in the eastern Lhasa Terrane (Zhao et al ., ).…”

Section: Geological Settings and Sampling Locationmentioning

confidence: 99%

“…Abundant polymetallic deposits occur in the Lhasa Terrane, the formation of which closely links with Mesozoic–Cenozoic magmatism (Hou and Cook, ; Gao et al ., , , , , ; Li et al ., ; Zhao et al ., , , ). The Yaguila Pb–Zn–Ag–Mo polymetallic ore deposit is just one such example that, together with the Dongzhongla and Dongzhongsongduo Pb–Zn ore deposits and Sharang Mo deposits, runs along the Central Lhasa Terrane 35 km north of the Jinda Town, Gongbujiangda County.…”

Section: Geological Settings and Sampling Locationmentioning

confidence: 99%

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Geochronological and geochemical constraints on the origin of Yaguila Cretaceous and Palaeogene ore-bearing quartz porphyries, Central Lhasa Terrane, Tibet

et al. 2015

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The quartz porphyries at Yaguila, Tibet, host important polymetallic ore deposits, but their age, source and evolution have received insufficient attention. In this study, LA-ICP-MS U-Pb zircon ages revealed that these quartz porphyries were formed in two stages, i.e. precollisional Early Cretaceous period (ca. 128 Ma) and late subduction to initial collision Palaeogene period (ca. 65 Ma). Geochemical evidence including whole-rock major element, trace element and rare earth element, zircon Hf isotopes together with sulphide Pb isotopes suggests the Early Cretaceous quartz porphyries could have formed by means of partial melting of crustal materials from Lhasa Terrane basement in a thickened crustal tectonic setting, whereas the Palaeogene quartz porphyries by enhanced input of mantle components probably were associated with slab rollback and breakoff at that time. Granitoid magmas produced in this way ascended to upper crustal level and interacted with marbles and breccias to form Pb-Zn-Ag ore bodies and Mo ore bodies, respectively. Age and geochemical constraints on the Early Cretaceous and Palaeogene polymetallic ore bodies not only have favoured a skarn and hydrothermal vein origin over a submarine exhalative sedimentary origin but also have consummated ore deposits metallogenic series and built up a reconnaissance model along the Lhasa Terrane.

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Section: Geological Settings and Sampling Locationmentioning

confidence: 99%

Section: Geological Settings and Sampling Locationmentioning

confidence: 99%

Geochronological and geochemical constraints on the origin of Yaguila Cretaceous and Palaeogene ore-bearing quartz porphyries, Central Lhasa Terrane, Tibet

et al. 2015

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“…Sun, Hu, Sinclair, et al (), G. Y. Sun, Hu, Zhu, et al (), S. F. Fan, Qu, Song, and Xin (), T. S. Yang et al (), Zhao et al (), Zhao et al (), M. J. Cao et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

et al. 2018

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The Lhasa terrane is one of the major segments of the Tibetan Plateau, with widespread Mesozoic to Cenozoic magmatic and metallogenic records. Here, we investigate timing and characteristics of magmatism associated with the Lunggar Fe skarn deposit in Central Lhasa. We also present Sr–Nd–Pb and Hf (zircon) isotopic data on three associated intrusions to gain insights on the tectonic and metallogenic evolution of the region. Our data reveal at least two magmatic pulses in Lunggar represented by Early Cretaceous I‐type granodiorite (112.9 ± 1.5 Ma) and granite porphyry (112.6 ± 1.3 Ma) with magma generation related to slab break‐off associated with the Bangong–Nujiang Ocean during closure of the Meso‐Tethyan ocean at ~113 Ma. Iron skarn mineralization at Lunggar was contemporaneous with local Early Cretaceous intrusive activity. Following this, Late Cretaceous adakitic diorite (90.5 ± 1.5 Ma) formed from delaminated thickened crust at ~91 Ma related to the northern subduction of the Yarlung‐Zangbo oceanic plate. We also provide a comprehensive review of the Cretaceous tectonic evolution of Central Lhasa, which trace the tectonic evolution as follows: (a) 145–120 Ma: southward subduction of the Bangong–Nujiang oceanic plate under the Lhasa terrane; (b) 120–115 Ma: Lhasa‐Qiangtang continental collision; (c) 115–110 Ma: slab break‐off of the Bangong–Nujiang Ocean; (d) 110–95 Ma: crustal thickening of the Central Lhasa lower crust; (e) 95–80 Ma: delamination of lithospheric mantle; and (f) 80–65 Ma: northward subduction of the Yarlung‐Zangbo oceanic plate and subsequent slab rollback. The related metallogenic events in Central Lhasa include (a) ~115–110 Ma skarn Fe mineralization associated with slab break‐off; (b) ~90–80 Ma porphyry Cu–Au mineralization formed in delaminated thickened crust of Central Lhasa; and (c) ~65 Ma skarn Pb–Zn mineralization produced from slab rollback of the Yarlung‐Zangbo Ocean.

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“…Molybdenum mineralization consists of (1) quartz + molybdenite veins, (2) quartz + sulfide ± sulfate, (3) quartz-molybdenite stockworks, and (4) disseminations in hydrothermal cements of breccias of granite porphyry. Mo ores are mostly hosted in potassic and quartz-sericitie alterations (Zhao et al , 2015.…”

Section: Mo Deposits From Tibetan Plateaumentioning

confidence: 99%

Variation of molybdenum isotopes in molybdenite from porphyry and vein Mo deposits in the Gangdese metallogenic belt, Tibetan plateau and its implications

et al. 2015

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We present Mo isotopic ratios of molybdenite from five porphyry molybdenum deposits (Chagele, Sharang, Jiru, Qulong, and Zhuonuo) and one quartz-molybdenite vein-type deposit (Jigongcun) along the Gangdese metallogenic belt in the Tibetan Plateau. These deposits represent a sequence of consecutive events of the India-Asia collision at different periods. Additional molybdenite samples from the Henderson Mo deposit (USA), the oceanic subduction-related El Teniente (Chile), and Bingham (USA) porphyry Cu-(Mo) deposits were analyzed for better understanding the controls on the Mo isotope systematics of molybdenite. The results show that molybdenite from Sharang, Jiru, Qulong, and Zhuonuo deposits have similar δ 97 Mo (∼0‰), in agreement with the values of the Henderson Mo deposit (−0.10‰). In contrast, samples from the Changle and Jigongcun deposit have δ 97 Mo of 0.85‰ to 0.88‰ and −0.48 %, respectively. Molybdenite from the El Teniente and Bingham deposits yields intermediate δ 97 Mo of 0.27 and 0.46‰, respectively. The Mo isotopes, combined with Nd isotope data of the ore-bearing porphyries, indicate that source of the ore-related magmas has fundamental effects on the Mo isotopic compositions of molybdenite. Our study indicates that molybdenite related to crustal-, and mantle-derived magmas has positive or negative δ 97 Mo values, respectively, whereas molybdenite from porphyries formed by crust-mantle mixing has δ 97 Mo close to 0‰. It is concluded that the Mo isotope composition in the porphyry system is a huge source signature, without relation to the tectonic setting under which the porphyry deposits formed.

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The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa

Cited by 39 publications

References 80 publications

Geochronological and geochemical constraints on the origin of Yaguila Cretaceous and Palaeogene ore-bearing quartz porphyries, Central Lhasa Terrane, Tibet

Geochronological and geochemical constraints on the origin of Yaguila Cretaceous and Palaeogene ore-bearing quartz porphyries, Central Lhasa Terrane, Tibet

Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

Variation of molybdenum isotopes in molybdenite from porphyry and vein Mo deposits in the Gangdese metallogenic belt, Tibetan plateau and its implications

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