云南马龙苍龙山黑色岩系Mo-Ni多金属矿沉积相特征  

Sedimentary Facies of Black Rock Series in Canglongshan Mo-Ni Polymetallic District in Malong,Yunnan

作　　者：念红良 周洪瑞[2] 佘中明 郑荣华 孙柱兵 郎学领 

机构地区：[1]云南省有色地质局三一七队,云南曲靖655000 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]云南省地质勘查基金管理中心,云南昆明650224

出　　处：《昆明理工大学学报（自然科学版）》2016年第3期37-42,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：云南省地勘基金项目(2014007)

摘　　要：通过对云南马龙苍龙山Mo-Ni多金属矿区6个钻孔进行沉积相横向对比研究发现,上Mo-Ni矿层沉积相类型属于浅海下部,层序旋回方面位于三级层序海进体系域的上部,最大海泛期形成的凝缩层之下;下Mo-Ni矿层沉积相类型属于浅海下部,三级层序海进体系域的上部,沉积相由矿区西南到东北逐渐变浅.纵向上由老到新沉积相组合类型以陆源碎屑浅海-半深海-陆源碎屑滨浅海为特征,沉积物粒度向上逐渐变粗.结合区域岩相古地理特征,在早寒武世矿区靠近牛首山古岛,牛首山古岛作为物源区给矿区提供了大量陆源碎屑物质.Based on correlation of sedimentary facies among drill cores from six boreholes in the black rock series in the Cambrian Canglongshan Mo -Ni Polymetallic District in Malong, Yunnan Province, we conclude that the upper part of the ore deposit is consistent with the lower part of neritic facies, which corresponds in sequence stratigraphy to the upper part of a transgressive systems tract （ situated below the condensed section deposited during the maximum flooding period） of a third - order sequence ; the lower part of the ore deposit corresponds to the lower part of neritic facies, sequence being stratigraphically consistent to the upper part of a transgressive systems tract of a third - order sequence. The sea waters were increasingly shallower northeastwards in the mineral district. Vertically（from older to younger） , the sedimentary assemblage ranges from siliciclastic neritic and bathyal to siliciclastic littoral -neritic facies, with the sediments coarsening upward. Taking into account the paleogeography of this region in the vicinity of the Niushoushan paleo - island, we suggest that this paleo - island serves as the siliciclastic provenance for the Canglongshan Mo -Ni Polymetallic District.

关 键 词：黑色岩系 Mo-Ni多金属矿 沉积相 云南马龙 

分 类 号：P536[天文地球—古生物学与地层学]