滇西保山核桃坪铅锌矿床稀土元素地球化学特征及其成因意义  

REE Geochemical Characteristics of Hetaoping Pb-Zn Deposit,Baoshan County,Western Yunnan Province and Its Genetic Implications

作　　者：王建荣[1] 薛传东[1] 黄河远[1] 靳纪娟[1] 

机构地区：[1]昆明理工大学地球科学系,云南昆明650093

出　　处：《现代地质》2014年第4期721-730,共10页Geoscience

基　　金：国家自然科学基金项目(40772067;U0933605);云南省自然科学基金项目(2006D020M;2009CI030)

摘　　要：核桃坪铅锌矿床产于滇西保山古生代地块内,是近年来在西南"三江"地区勘查发现的大型铅锌(铜银)多金属矿床,也是该区为数不多的以断控脉状矽卡岩赋矿为特征的矿床。详细研究了区内铅锌矿体的各种赋矿围岩、蚀变(脉)体及矿石的稀土元素地球化学特征,结果表明:围岩的稀土元素主要富集在粘土矿物中,上侵的矽卡岩流体萃取了围岩中的稀土元素,并使自身稀土元素组成发生改变;当前揭露浅部矽卡岩的成岩流体为中—低温、酸—弱酸性流体,其酸度随流体演化而不断增加。认为核桃坪铅锌矿床可能是一个远端矽卡岩型矿床,矽卡岩及伴生铅锌(铜银)的成岩成矿作用均受控制于隐伏的岩浆-热液系统。The Hetaoping Pb-Zn deposit of Baoshan County is located in western Yunnan Province.It is one of large-scale lead-zinc（copper-silver）polymetallic deposits characterized of vein skarn-type ore-bearing deposits and controlled by fractures in Three River area of Yunnan Province,southwestern China.The authors systemati-cally studied rare earth element （REE ）geochemical characteristics of the surrounding rocks,Pb-Zn ores and hydrothermal veins of Hetaoping Pb-Zn ore fields.The results show that REE in the surrounding rocks is mainly enriched in clay minerals.The skarn fluids extract the REE in the surrounding rocks and change their REE chondrite-normalized patterns.For now,exploration revealed shallow skarn diagenetic fluid is in medium-low temperature and acid-weak acid fluid,with the fluid evolutionary,the acidity of the fluid increases.Combined with the previous researching results,it is considered that the Hetaoping Pb-Zn deposit is a distal skarn-type Pb-Zn deposit and the rock-and ore-formations of the skarm and lead-zine （copper-silver）controlled by magmatic hydrothermal.

关 键 词：稀土元素地球化学 围岩 远端矽卡岩 核桃坪铅锌矿床 滇西 

分 类 号：P618.4[天文地球—矿床学]