The Late Silurian Langmuri Cu-Ni Deposit in East Kunlun Orogenic Belt: An Example of Magmatic Sulfide Deposit in a Post-Collisional Extensional Setting

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Island Arc Pub Date : 2025-04-28 DOI:10.1111/iar.70013

Namkha Norbu, Jinchao Li, Zhouyuan Zhang, Wenjing Zhang

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引用次数: 0

Abstract

The East Kunlun orogenic belt (EKOB), located in the northeastern part of the Qinghai-Tibet Plateau, is a significant Cu-Ni mineralization region associated with the geological evolution of the Paleo-Tethys and Proto-Tethys stages. Orogenic environments in this region exhibit considerable metallogenic potential, with two distinct metallogenic models: the subduction-related island arc model and the post-collisional extensional model. This study investigates the petrology, zircon U–Pb chronology, and geochemistry of ore-bearing intrusions in the Langmuri Cu-Ni deposit. The results reveal that the wehrlite yields a zircon U–Pb age of 420.0 ± 1.4 Ma, with an average ε_Hf(t) value of −5.5 and significant Nb-Ta negative anomalies. These features suggest that the parental magma was likely derived from the partial melting of a metasomatized continental lithospheric mantle. Additionally, crustal contamination during magma ascent triggered significant crustal sulfur assimilation. The Langmuri deposit represents a mineralization event formed during the final tectonic stage of the Proto-Tethys Ocean in a post-collisional extensional setting. Slab breakoff released hydrous fluids and melts that metasomatically enriched the lithospheric mantle, thereby providing the material basis for magmatic sulfide segregation.

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东昆仑造山带晚志留世Langmuri铜镍矿床：碰撞后伸展环境下岩浆硫化物矿床的一个例子

东昆仑造山带位于青藏高原东北部，是与古特提斯期和原特提斯期地质演化有关的重要铜镍成矿带。本区造山环境具有相当的成矿潜力，具有两种不同的成矿模式：与俯冲有关的岛弧模式和碰撞后伸展模式。研究了Langmuri铜镍矿床含矿岩体的岩石学、锆石U-Pb年代学和地球化学特征。结果表明：锆石U-Pb年龄为420.0±1.4 Ma，平均εHf(t)值为- 5.5，Nb-Ta负异常显著；这些特征表明母岩浆可能来源于交代大陆岩石圈地幔的部分熔融。此外，岩浆上升过程中的地壳污染引发了显著的地壳硫同化。Langmuri矿床代表了碰撞后伸展环境下原特提斯洋最后构造阶段形成的成矿事件。板块断裂释放的含水流体和熔体交代丰富了岩石圈地幔，为岩浆硫化物分离提供了物质基础。

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来源期刊

Island Arc 地学-地球科学综合

CiteScore

2.90

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.