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滇西腾冲-梁河锡矿带是三江特提斯成矿域重要的锡多金属成矿区,目前已发现具有代表性的大型锡矿床2个:古近纪的梁河来利山锡矿床和晚白垩纪的腾冲小龙河锡矿床。对这2个矿床主成矿阶段形成的黄铁矿样品进行了硫同位素测定,结果表明来利山锡矿床黄铁矿的δ~(34)S_(CDT)值为+4.9‰～+6.7‰,平均值+5.5‰(n=10);小龙河锡矿床δ~(34)S_(CDT)值为+5.0‰～+8.1‰,平均值+6.3‰(n=32)。两个锡矿床的δ~(34)S_(CDT)值与矿区花岗岩的δ~(34)S_(CDT)值(0～+5.7‰)范围基本一致,暗示这2个矿床的成矿流体中的硫均主要来自花岗岩浆。结合已有研究资料,认为腾冲-梁河锡矿带这两个典型锡矿床与矿区花岗岩具有同时性,其成矿流体均主要源自各矿区花岗岩浆的分异演化,花岗岩浆还为锡矿化提供了部分Sn成矿物质,小龙河和来利山锡矿床的锡成矿作用与花岗岩浆活动具有密切的联系,属于花岗岩岩浆热液矿床。
The Tengchong-Lianghe tin belt in western Yunnan is an important tin polymetallic metallogenic area in the Tethys metallogenic area of Sanjiang. At present, two large tin deposits have been found: the Lianghe-Li Lishan tin deposit and the Late Cretaceous Ji Tengchong dragons tin deposit. The results of sulfur isotopic measurements of pyrite formed in the main mineralization stages of these two deposits show that the δ ~ (34) S CDT value of pyrite in Laishan tin deposit is + 4.9 ‰ ~ + 6.7 ‰ , With a mean of +5.5 ‰ (n = 10). The δ ~ (34) S CDT of the Xiaolonghe tin deposit is + 5.0 ‰ ~ + 8.1 ‰ with an average of + 6.3 ‰ (n = 32). The δ ~ (34) S CDT values of the two tin deposits are basically in agreement with the δ 34 CD values (0 ~ + 5.7 ‰) of the granitoids in the ore deposits, suggesting that The sulfur are mainly from granite magma. Combined with the existing research data, it is considered that the two typical tin deposits in Tengchong-Lianghe tin belt are synchronous with the granite in the ore district, and the ore-forming fluids are mainly derived from the differentiation and evolution of granite magma in each ore district, and the granite magma also provides tin mineralization Some Sn metallogenic materials, the tin mineralization of the Xiaolonghe and Laishan tin deposits are closely related to the granitic magmatism and belong to the granitic magmatic hydrothermal deposit.