黔西南晴隆Sb矿田固体沥青激光拉曼光谱特征及其地质意义  

Laser Raman spectrum characteristics of solid bitumenfrom Qinglong antimony ore field in southwest Guizhou Province and its geological significance

作　　者：程涌 CHENG Yong(Faculty of Metallurgy and Mining Engineering,Kunming Metallurgy College,Kunming 650033,China;Key Laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province,School of Earth Sciences,Yunnan University,Kunming 650500,China)

机构地区：[1]昆明冶金高等专科学校冶金与矿业学院,昆明650033 [2]云南大学地球科学学院,云南省高校关键矿产成矿学重点实验室,昆明650500

出　　处：《有色金属（矿山部分）》2024年第4期113-123,共11页NONFERROUS METALS(Mining Section)

基　　金：国家自然科学基金资助项目(41672073);云南省基础研究专项(202401AT070047);云南省教育厅基金(2022J1304);昆明冶金高等专科学校科研基金(2022xjy23)共同资助

摘　　要：目的:油气成藏与金属成矿之间的复杂成因联系已引起越来越多学者的关注和研究。与金属矿床相伴/相邻产出的固体沥青是油气演化的产物,记录了盆地烃类流体的重要信息,是研究成藏与成矿联系的重要载体。黔西南晴隆Sb矿田中赋存有大量古油藏固体沥青。为了揭示成藏和Sb成矿演化历史,进行了本项研究。方法:本次研究对矿床蚀变玄武岩围岩沥青进行了激光拉曼光谱分析。结果:激光拉曼光谱两峰间距(W G-W_(D))与峰强度比(I_(D)/I_(G))散点图揭示沥青处于过成熟阶段,换算获得的沥青反射率(R_(b))为1.04~3.15(平均2.36)。结论:研究结果表明,矿床蚀变玄武岩围岩沥青与矿田北西部古油藏沥青为同一期油气活动的产物。此外,固体沥青经历的最高古地温为158~299℃(平均257℃),高于正常地层埋藏温度(~200℃),其记录了Sb成矿热事件。综合分析认为,晴隆古油藏演化形成的古气藏在Sb成矿中发挥了重要作用,即为Sb成矿贡献了大量还原硫。Purpose:The intricate genetic linkage between hydrocarbon accumulation and metal mineralization has garnered escalating scholarly interest.The solid bitumen,associated/adjacent to metal deposits,epitomizes the evolutionary trajectory of hydrocarbons,encapsulating pivotal data on basin fluids and acting as a quintessential medium for probing the interplay between hydrocarbon and metal deposits.The Qinglong Sb ore field in southwest Guizhou province contains a large amount of paleo-oil reservoir solid bitumen.To decipher the evolution history of hydrocarbon accumulation and antimony mineralization,the study was carried out.Method:This study employed laser Raman spectroscopy to analyze the bitumen in the host altered basalt.Result:The scatter plot delineating peak separation(W_(G)-W_(D))and peak intensity ratio(I_(D)/I_(G))corroborates the bitumen’s over-mature phase,with reflectance values(R b)spanning 1.04 to 3.15,averaging at 2.36.Conclusion:The findings of the investigation reveal a synchronous hydrocarbon event characterized by the presence of bituminous substances in both the altered basalt surrounding rock and the paleo-oil reservoir located in the northwestern sector of the ore field.Furthermore,the zenith paleotemperatures of the solid bitumen,ranging from 158℃to 299℃(average 257℃),surpass the normative sedimentary burial heat(~200℃),chronicling an Sb mineralization thermal event.A holistic analysis infers that the paleo-gas reservoir,spawned by the Qinglong paleo-oil reservoir,was pivotal in Sb mineralization,endowing substantial reduced sulfur to the process.

关 键 词：激光拉曼光谱 古油藏 沥青反射率(R_(b)) 古地温 成藏—成矿关系 

分 类 号：P611[天文地球—矿床学] TD15[天文地球—地质学]