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为进一步探讨都龙锡锌多金属矿床的成矿物质来源,本文开展了硫、碳、氧同位素研究。结果表明,58件硫化物单矿物的δ34S值变化小,靠近零值,具岩浆硫特性,说明该矿床的硫主要来自岩浆分异作用;23件含矿方解石样品的δ13 C值为-3.09‰~-8.57‰,均值-6.57‰,与岩浆碳同位素组成一致,且明显偏离大理岩分布范围。相对于早期含矿方解石,晚期不含矿方解石的δ13 C基本未变化,但δ18 O降低,显示后期有大气降水加入;大理岩的δ13 C值变化不大,近地表浅部的大理岩较深部、重结晶明显的大理岩的δ18 O更小。说明碳、氧主要来自岩浆,晚期则有大气降水的混合。
In order to further discuss the source of metallogenic material of Du Long tin zinc polymetallic deposit, this paper carried out the study of sulfur, carbon and oxygen isotopes. The results show that δ34S values of 58 sulfide single minerals change little, close to zero value and have magmatic sulfur characteristics, indicating that the sulfur in this deposit mainly comes from magmatic differentiation. The δ13C value of 23 ore-bearing calcite samples is -3.09 ‰ ~ -8.57 ‰, mean -6.57 ‰, which is consistent with the carbon isotopic composition of magmatic rocks and obviously deviates from the marble distribution range. Compared with the early ore-bearing calcite, the δ13C of the later non-ore-bearing calcite basically remained unchanged, but the δ18 O decreased, indicating that the precipitation was added in the later period. The δ13C value of the marble did not change much and the depth of the marble near the superficial surface , The sharp δ18 O of the recrystallized marble is smaller. Description of carbon, oxygen mainly from magma, late there is a mixture of atmospheric precipitation.