哀牢山长安金矿成因机制及动力学背景初探:来自LA-ICP-MS锆石U-Pb定年和黄铁矿原位微量元素测定的证据
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摘要
长安金矿床是哀牢山成矿带南段大型矿床之一,金矿化位于志留系、奥陶系之间发育的不整合面内,矿体整体呈透镜状。矿区内脉岩广布,矿体与脉岩共生或被脉岩切穿,表明金成矿与金沙江-哀牢山新生代富碱斑岩的侵入关系密切。本文在较为详细的野外观察基础上,对侵入矿体内的脉岩进行LA-ICP-MS U-Pb测年表明,细晶正长岩脉和正长斑岩的成岩年龄分别为32.5±0.1Ma和33.0±0.1Ma,与哀牢山的新生代富碱斑岩金多金属矿床的成矿时代(34±2Ma)基本一致。通过对长安金矿床、铜厂铜钼金矿床、长安冲铜钼金矿床中黄铁矿的LA-ICP-MS原位微量元素分析,发现黄铁矿中成矿元素含量随Co/Ni比值的下降而上升,呈一定的负相关性,可能指示其成矿物质主要来源于岩浆流体。结合前人的研究成果,表明喜山期强烈的壳幔作用导致大规模的富碱岩浆上侵,不仅为含矿流体的上升提供了动力和热能,而且还是成矿物质和成矿流体的主要来源。
The Chang'an is one of the largest gold deposits located at the southern segment of the Ailaoshan metallogenic belt. The lenticular ore body is preserved in between Silurian and Ordovician unconformity. Magmatic rocks exposed in the area are mainly Cenozoic high-K alkaline rocks. The ore bodies and dykes occur together or cut each other. Gold mineralization has a close relationship with the Jinsha-Ailaoshan Cenozoic alkali-rich porphyry intrusion. Based on the recent extensive researches and field investigations,the close symbiosis dyke with ore bodies zircon LA-ICP-MS U-Pb dating shows that fine-grained syenite and syenite porphyry dykes diagenetic age were 32. 5 ± 0. 1Ma and 33. 0 ± 0. 1Ma. These are basically the same with the large-scale concentrated ages of the Cenozoic alkali-rich porphyry type gold-polymetallic deposits,Ailaoshan. Pyrite from Chang'an,Tongchang and Chang'anchong deposit,have been selected for detailed study in this paper. The LA-ICP-MS trace element analyses of these pyrites demonstrate a negative correlation between ore-forming elements and the Co / Ni ratio. A positive correlation between Au and As may indicate that the ore-forming fluid was mainly sourced from the deep mantle fluids. Combined with previous research results show that the Himalayan Period crust-mantle interaction leads to massive alkali-rich magma intrusion,not only provided the impetus and energy for the ore fluid, but also the main source of minerals and ore-forming fluids. Multi-phase intrusive rock,resulting in the ore-forming fluid and mineralizing last for a long time,which may be one of the important reasons for the formation of the gold deposits in this area.
The Chang'an is one of the largest gold deposits located at the southern segment of the Ailaoshan metallogenic belt. The lenticular ore body is preserved in between Silurian and Ordovician unconformity. Magmatic rocks exposed in the area are mainly Cenozoic high-K alkaline rocks. The ore bodies and dykes occur together or cut each other. Gold mineralization has a close relationship with the Jinsha-Ailaoshan Cenozoic alkali-rich porphyry intrusion. Based on the recent extensive researches and field investigations,the close symbiosis dyke with ore bodies zircon LA-ICP-MS U-Pb dating shows that fine-grained syenite and syenite porphyry dykes diagenetic age were 32. 5 ± 0. 1Ma and 33. 0 ± 0. 1Ma. These are basically the same with the large-scale concentrated ages of the Cenozoic alkali-rich porphyry type gold-polymetallic deposits,Ailaoshan. Pyrite from Chang'an,Tongchang and Chang'anchong deposit,have been selected for detailed study in this paper. The LA-ICP-MS trace element analyses of these pyrites demonstrate a negative correlation between ore-forming elements and the Co / Ni ratio. A positive correlation between Au and As may indicate that the ore-forming fluid was mainly sourced from the deep mantle fluids. Combined with previous research results show that the Himalayan Period crust-mantle interaction leads to massive alkali-rich magma intrusion,not only provided the impetus and energy for the ore fluid, but also the main source of minerals and ore-forming fluids. Multi-phase intrusive rock,resulting in the ore-forming fluid and mineralizing last for a long time,which may be one of the important reasons for the formation of the gold deposits in this area.
引文
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