The Kuntabin Sn-W deposit, located in southern Myanmar, is characterized by abundant greisen-type and quartz vein-type cassiterite and wolframite mineralization. We have conducted multiple geochronological methods and isotope and trace element analyses to reveal the age and evolution of the Kuntabin magmatichydrothermal system.Zircon U-Pb dating of the two-mica granite yielded a weighted mean ²⁰⁶Pb/²³⁸U age of 90.1 ± 0.7 Ma. Cassiterite U-Pb dating provided a lower intercept age of 88.1 ± 1.9 Ma in the Tera-Wasserburg U-Pb concordia diagram. Molybdenite Re-Os dating returned a weighted mean model age of 87.7 ± 0.5 Ma and an isochron age of 88.7 ± 2.7 Ma. These ages indicate a genetic relationship between granite and Sn-W mineralization in the Kuntabin deposit and record the earliest magmatism and Sn-W mineralization in the Sibumasu and Tengchong terranes related to subduction of the Neo-Tethys oceanic slab. Three generations of cassiterite have been identified with distinctive cathodoluminescence textures and trace element patterns, indicating the episodic input of ore-forming fluids and distinctive changes in the physical-chemical conditions of the Kuntabin magmatichydrothermal system. Sudden changes of fluid pressure, temperature, pH, etc., may have facilitated the deposition of Sn and W. Rhenium contents of molybdenite from the Kuntabin deposit and many other Sn-W deposits in Myanmar are characteristically low compared to porphyry Cu-Mo-(Au) deposits worldwide. In combination with zircon Hf isotope signatures, we infer that granites associated with Sn-W deposits in Myanmar were predominantly derived by melting of ancient continental crust and contain minimal mantle contribution.Subduction of the Neo-Tethys oceanic slab from west of the West Burma terrane reached beneath the Sibumasu terrane and led to magmatism and Sn-W mineralization at ~90 Ma when the Kuntabin deposit was formed. The Paleoproterozoic Sibumasu crust was activated during the subduction-related magmatism to form predominantly crust derived melts. After a high degree of fractional crystallization and fluid exsolution, physical-chemical changes of the hydrothermal fluid resulted in Sn and W precipitation to form the Kuntabin Sn-W deposit.

中文翻译：

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缅甸昆塔宾锡钨矿床的锆石，辉钼矿和锡铁矿综合年代学和锡铁矿地球化学

位于缅甸南部的Kuntabin Sn-W矿床具有大量的格列森型和石英脉型锡石和黑钨矿成矿作用。我们已经进行了多种年代学方法以及同位素和微量元素分析，以揭示昆塔宾岩浆热液系统的年龄和演化。两云母花岗岩的锆石U-Pb测年得出的加权平均值为²⁰⁶ Pb / ²³⁸U年龄90.1±0.7 Ma。在Tera-Wasserburg U-Pb concordia图中，锡石U-Pb测年的截距年龄较低，为88.1±1.9 Ma。辉钼矿Re-Os的加权平均模型年龄为87.7±0.5 Ma，等时年龄为88.7±2.7 Ma。这些年龄表明了昆塔宾矿床中花岗岩与锡钨矿化之间的遗传关系，并记录了与新特提斯洋板俯冲有关的锡巴马苏和腾冲地层最早的岩浆作用和锡钨矿化。已经鉴定出三代锡石，具有独特的阴极发光结构和微量元素图案，表明成矿流体的偶发输入和昆塔宾岩浆热液系统的物理化学条件的独特变化。流体压力，温度，pH等的突然变化，可能促进了Sn和W的沉积。与世界范围内斑岩型Cu-Mo-（Au）矿床相比，缅甸Kuntabin矿床和许多其他Sn-W矿床中辉钼矿的R含量通常较低。结合锆石Hf同位素特征，我们推断与缅甸锡钨矿床相关的花岗岩主要是通过古代大陆壳的融化而产生的，并且地幔贡献最小。从西缅甸地体以西俯冲的新特提斯洋板当昆塔宾矿床形成时，在约90 Ma处达到了Sibumasu地层的下方并导致了岩浆作用和Sn-W矿化。在俯冲相关的岩浆作用期间，古元古代的西布马苏地壳被激活，主要形成地壳衍生的熔体。经过高度分级结晶和液体溶出后，