摘要
锂是当今中国重要的战略金属资源。近年来,在西昆仑稀有金属成矿带中陆续发现卡拉瓦拉、牧林场、康西瓦、白龙山、雪凤岭等中大型高品位伟晶岩型锂矿。为了在具有锂铍化探异常圈定区域寻找新的稀有金属矿床,本次研究以西昆仑造山带东缘大红柳滩稀有金属矿集区的白龙山矿床为模型,建立“晚三叠世S型花岗岩-伟晶岩+巴颜喀拉群地层+韧性剪切带的薄弱地段就位+锂铍化探异常”的组合找矿模型。为了探究位于大红柳滩东缘的克里雅地区是否具有发现稀有金属矿床的潜力,本文以这套组合找矿模型为指导思想,结合地球化学、锆石U-Pb年代学及Hf-Nd同位素等方法对克里雅花岗岩体的研究成果,同时通过区域地层及其构造背景与白龙山矿床的对比分析,结果表明:克里雅岩体属于S型二长花岗岩,平均年龄为207±1.1Ma,与白龙山矿床母岩S型二云母花岗岩在误差范围内一致;此外,尽管克里雅区域锂铍化探异常较高,出露地层相同,且出露伟晶岩,构造形成环境同为后碰撞,但两者岩浆源区不一致。基于以上研究,本文认为克里雅地区不适合运用以白龙山伟晶岩型锂矿床为模型的找矿理论指导。
Lithium is a crucial strategic metal resource for modern China.In recent years,significant medium to large high-grade pegmatite-type lithium deposits,such as those at Kalawala,Mulinchang,Kangxiwa,Bailongshan,and Xuefengling,have been discovered in the West Kunlun rare metal metallogenic belt.To identify new rare metal deposits in regions marked by lithium-beryllium geochemical anomalies,this study employs the Bailongshan deposit in the Dahongliutan rare metal ore concentration area on the eastern margin of the West Kunlun orogenic belt as a model.The research establishes a prospecting model that integrates"Late Triassic S-type granite-pegmatite+Bayankala Group strata+emplacement in weak zones of ductile shear belts+lithium-beryllium geochemical anomalies."To assess the potential for rare metal deposit discovery in the Keliya region,located on the eastern margin of Dahongliutan,this paper utilizes the aforementioned prospecting model as a guiding framework.It combines methodologies such as geochemistry,zircon U-Pb geochronology,and Hf-Nd isotopes in the investigation of the Keliya granite body.Comparative analyses of regional stratigraphy and tectonic settings between the Keliya and Bailongshan deposits reveal that the Keliya body is an S-type monzogranite with an average age of 207±1.1Ma,consistent within the margin of error with the S-type two-mica granite of the Bailongshan deposit.Moreover,despite high lithium-beryllium geochemical anomalies,similar exposed strata,pegmatite outcrops,and a post-collisional tectonic setting in both regions,the magma sources of the two areas differ.Based on the above research,this paper concludes that the Keliya region is not suitable for using the prospecting theory modeled after the pegmatite-type lithium deposit of Bailongshan as a guide.
作者
王振宏
王核
白洪阳
黄亮
王堃宇
刘金恒
WANG ZhenHong;WANG He;BAI HongYang;HUANG Liang;WANG KunYu;LIU JinHeng(Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第8期2415-2428,共14页
Acta Petrologica Sinica
基金
第二次青藏高原综合科学考察(2019QZKK0802)
第三次新疆综合科学考察(2022xjkk1301)联合资助。
