滇西叫鸡冠铁多金属矿床碳氧硫同位素地球化学特征研究  

Carbon,Oxygen and Sulfur Isotope Geochemical Characteristics of the Jiaojiguan Ferrum Polymetallic Deposit,Western Yunnan

作　　者：赵泓一 邓明国[1] 沙建泽 陈伟 贾祯 Zhao Hongyi;Deng Mingguo;Sha Jianze;Chen Wei;Jia Zhen(Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093;Yunnan Institute of Geological Survey,Kunming,Yunnan 650216;MLR Key Laboratory of Sanjiang Metallogeny&Resources,Kunming,Yunnan 650051;West Yunnan University of Applied Sciences,Dali,Yunnan 671000)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南省地质调查院,云南昆明650216 [3]自然资源部三江成矿作用及资源利用重点实验室,云南昆明650051 [4]滇西应用技术大学,云南大理671000

出　　处：《中国煤炭地质》2022年第11期19-25,30,共8页Coal Geology of China

基　　金：国家自然科学基金项目“滇西芦子园铅锌矿床构造-流体与成矿关系研究”(41363001);“滇西勐兴铅锌矿床矿化时空结构与成矿模型研究”(41762009)。

摘　　要：叫鸡冠铁多金属矿床位于滇西腾冲县中缅边境附近,矿床规模可达大(中)型。矿体主要以似层状、透镜状产于二叠系空树河组。为明确矿床成矿流体、成矿物质的来源及演化,对不同阶段的岩石样品进行C-O-S同位素研究。结果显示,叫鸡冠矿床热液方解石的δ^(13)C_(V-PDB)变化范围为-8.54‰~-5.13‰;δ^(18)O_(V-SNOW)值变化范围为5.74‰~9.83‰,表明矿床成矿流体主要来源于深部岩浆热液,在迁移成矿过程中可能受到了沉积岩混染和水岩反应的影响;硫化物δ^(34)S_(CDT)值变化范围为2.91‰~5.65‰,指示硫源主要为深部岩浆硫。综合大地构造背景和矿床地质特征,该矿床为碰撞及碰撞后伸展的大地构造背景下,与燕山期岩浆作用有关的矽卡岩型矿床。Jiaojiguan ferrum polymetallic deposit is located in Tengchong county,western Yunnan,near the Sino-myanmar border,its deposit can reach large(medium)scale.The ore bodies are mainly bedded and lenticular in the Kongshuhe formation of Permian.In order to clarify the origin and evolution of ore-forming fluid and ore-forming material of the deposit,C-O-S isotopic research of rock samples at different stages was carried out.The results show that the variation range ofδ^(13)C_(V-PDB) of hydrothermal calcite in Jiaojiguan deposit is from-8.54‰to-5.13‰,and the variation range ofδ^(18)O_(V-SNOW) is from-8.54‰to-5.13‰.It indicates that the ore-forming fluid mainly comes from deep magmatic hydrothermal solution,and its migration mineralization may be influenced by the contamination of sedimentary rocks and water-rock reaction.The variation range of sulfideδ^(34)S_(CDT) is from 2.91‰to 5.65‰,and it indicates that the source of sulfur is mainly from deep magmatic sulfur.Synthesized on tectonic background and deposit geology,the deposit is a skarn-type deposit related to magmatic acticites at the stage of Yanshan under the tectonic background of collision and post-collision extension.

关 键 词：腾冲地块 矽卡岩型矿床 铁多金属矿床 C-O同位素 S同位素 成矿流体 成矿物质 

分 类 号：P618[天文地球—矿床学] P595[天文地球—地质学]