【摘要】 铜镍矿是我国重要的战略金属矿产。近年来新疆东天山地区发现了一大批岩浆型铜镍硫化物矿床，其中以图拉尔根铜镍矿床较为典型。以往研究认为地壳物质的混染可能在图拉尔根铜镍硫化物矿床成矿过程中起到了重要作用。本文利用激光剥蚀多接收杯电感耦合等离子体质谱（LA-MC-ICP-MS）技术，对图拉尔铜镍根矿床ZK1304钻孔进行纵向系统采样，并对硫化物单矿物开展原位硫同位素测试，获取了钻孔尺度的高分辨率硫同位素数据。结果表明，图拉尔根铜镍矿床矿石硫化物的δ³⁴S值（0.63‰～1.43‰）与洋中脊玄武岩（MORB）地幔硫化物的典型值（0±2‰）高度一致，指示成矿硫主要来源于深部基性岩浆体系。不同矿物相的δ³⁴S值差异极小，表明硫化物形成自一个均一且稳定的岩浆硫库，未发生显著的硫同位素分馏或阶段性硫源变化。围岩（凝灰岩）中黄铁矿的δ³⁴S值（2.00‰～5.27‰）明显偏重，与矿石硫化物的δ³⁴S值差异明显，说明围岩硫对成矿硫源的贡献非常有限。因此，认为图拉尔根矿床铜镍硫化物的沉淀可能主要受控于基性岩浆体系自身的演化，岩浆硫主控机制也可形成一定规模的铜镍硫化物矿床。更多还原

【Abstract】 Ni-Cu deposits are an important category of strategic metal resources in China. In recent years, a large number of magmatic Ni-Cu sulfide deposits have been discovered in the eastern Tianshan, Xinjiang, among which the Tulargen deposit is a typical example. Previous studies have suggested that crustal contamination may have played an important role in sulfide mineralization at the Tulargen deposit. In this study, laser ablation multi-collector inductively coupled plasma mass spectrometry（LA-MC-ICP-MS） was used to perform systematic vertical sampling of drill hole ZK1304 at the Tulargen deposit, and in-situ sulfur isotope analysis was conducted on sulfide minerals, providing highresolution sulfur isotope data at the drill-hole scale. The results show that the δ³⁴S values of the ore sulfides at the Tulargen deposit range from 0.63‰ to 1.43‰, which are highly consistent with the typical values of mantle sulfides in mid-ocean ridge basalts（MORB; 0 ± 2‰）. This indicates that the ore-forming sulfur mainly originates from a deep mafic magmatic system. The δ³⁴S values of different mineral phases show very little variation, suggesting that the sulfides formed from a homogeneous and stable magmatic sulfur reservoir, without significant sulfur isotope fractionation or temporal changes in sulfur sources. In contrast, the δ³⁴S values of pyrite from the surrounding tuffaceous rocks range from 2.00‰to 5.27‰, which are significantly heavier than those of the ore sulfides, indicating that the contribution of crustal sulfur to the ore-forming sulfur is minimal. Therefore, this study suggests that the precipitation of Ni-Cu sulfides at the Tulargen deposit was likely controlled mainly by the evolution of the mafic magmatic system itself. The magmadominated sulfur control mechanism can also form Ni-Cu sulfide deposits of considerable scale.更多还原