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Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China

西藏中拉萨地块隆格尔铁矿床含矿花岗闪长岩锆石U-Pb-Hf 同位素和 矿物化学组分研究

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An Erratum to this article was published on 01 March 2020

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Abstract

The Lunggar iron deposit belongs to the Bangong-Nujiang metallogenic belt and is located in central Lhasa on the Tibetan Plateau. In the Lunggar deposit, iron mineralization formed in the skarnization contact zone between the Early Cretaceous granodiorite and the late Permian Xiala Formation limestone. In this study, we achieved detailed zircon U-Pb-Hf isotopes and mineral chemistry for the Early Cretaceous granodiorite. Zircon U-Pb dating results indicate that the Early Cretaceous granodiorite emplaced at ca. 119 Ma. Based on the trace elements in zircons and the mineral chemical composition of amphibole and biotite, the Early Cretaceous granodiorite was believed to form under condition of high temperature (>700 °C), low pressure (100–400 MPa), and relatively high oxygen fugacity (lg/O2)(−13.6 to −13.9) and H2O content (4%–8%). Zircon trace elements, Hf isotope and biotite chemistry collectively reveal that significant juvenile mantle-derived magmas contributed to the source of the granodiorite. The relatively high log/O2 and shallow magma chamber are beneficial for skarn iron mineralization, implying remarkable potential for further prospecting in the Lunggar iron deposit.

摘要

隆格尔铁矿床隶属班公湖-怒江成矿带,位于青藏高原的中拉萨地块内。在隆格尔矿床中,铁 矿化发育于早白垩系花岗闪长岩和晚二叠系下拉组灰岩的矽卡岩化接触带上。本文报道了地早白垩系 花岗闪长岩(119 Ma)的锆石U-Pb-Hf 同位素和矿物化学组分特征。基于锆石微量元素和角闪石、黑云 母的化学组分,计算了岩体形成时的压力、温度、氧逸度和水成分。结果显示,早白垩系花岗闪长岩 形成于高温(>700 °C)、低压(100−100 MPa)、高氧逸度(−13.6∼−13.9)的环境中。锆石Hf 同位素和黑云 母化学组分显示,花岗闪长岩中有明显年轻幔源成分混入。较高的氧逸度和浅的形成环境有利于铁矿 化的形成,说明隆格尔铁矿床具有较好的找矿潜力。

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Change history

  • 15 April 2020

    The article title was wrong and it should be replaced as follows: Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet, China

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Authors and Affiliations

  1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geoscience and Info-physics, Central South University, Changsha, 410083, China

    Yun-hui Zhang  (张云辉), Wen-shu Wang  (王文澍), Jie Liu  (刘洁) & Ling-ling Yuan  (袁玲玲)

  2. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China

    Yun-hui Zhang  (张云辉)

  3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, China

    Yun-hui Zhang  (张云辉) & Yang-shuang Wang  (王杨双)

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  1. Yun-hui Zhang  (张云辉)
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Correspondence to Ling-ling Yuan  (袁玲玲).

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Foundation item: Project(2018YSJS14) supported by the Open Research Fund Program of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, China

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Zhang, Yh., Wang, Ys., Wang, Ws. et al. Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China. J. Cent. South Univ. 26, 3457–3469 (2019). https://doi.org/10.1007/s11771-019-4266-5

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