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首页> 外文期刊>Geological Journal >Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review
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Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

机译：藏藏高原中产阶级白垩甘蓝岩浆岩石岩石岩石的培养和成矿意义：Lunggar Fe Skarn押金和透视审查的案例研究

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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 similar to 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 similar to 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) similar to 115-110 Ma skarn Fe mineralization associated with slab break-off; (b) similar to 90-80 Ma porphyry Cu-Au mineralization formed in delaminated thickened crust of Central Lhasa; and (c) similar to 65 Ma skarn Pb-Zn mineralization produced from slab rollback of the Yarlung-Zangbo Ocean.
机译：拉萨特兰人是藏高原的主要部分之一，具有广泛的中生代至新生代岩石和成矿记录。在这里，我们调查与拉萨中部Lunggar Fe Skarn押金相关的Magmatism的时序和特征。我们还在三个相关侵入中呈现SR-ND-PB和HF（锆石）同位素数据，以获得对该区域的构造和形成的构造和成矿演化的见解。我们的数据揭示了由早期白垩纪I型Granodiorite（112.9 +/- 1.5 mA）和花岗岩斑岩（112.6 +/- 1.3 mA）表示的至少两个岩浆脉冲，与与邦贡相关的平板断裂相关 - 纽江海洋在关闭Meso-Tethyan海洋时，类似于113 mA。 Lunggar的铁矽卡岩矿化患者患有当地早期白垩纪的侵入性活动。遵循这一点，由Delaminated增稠外壳形成的晚酒后尚adaKitic Diorite（90.5 +/- 1.5 mA）类似于与雅隆 - Zangbo海洋板北部俯冲相关的91 mA。我们还提供了对中美洲中部的Cretace的构造演变进行了全面审查，这追溯了构造演变，如下所示：（a）145-120 ma：南方郊南的拉萨特拉地区下的邦戈 - 怒江海洋板块; （b）120-115 MA：拉萨 - 羌塘大陆碰撞; （c）115-110 MA：邦戈 - 怒江海洋的平板断裂; （d）110-95 MA：拉萨中部地壳的地壳增厚; （e）95-80 ma：岩石罩的分层;和（f）80-65 ma：雅隆 - Zangbo海洋板的向北俯冲和随后的板簧回滚。拉萨中部的相关成矿事件包括与平板断裂相关的115-110 mA Skarn Fe矿化; （b）类似于90-80 mA斑岩Cu-au矿化，形成于中央拉萨中部的分层加厚外壳; （c）类似于由Yarlung-Zangbo海洋的平板回滚生产的65 mA Skarn PB-Zn矿化。

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