摘要
脚基坪铜矿床位于西南三江成矿带的雅江成矿亚带上,为该区近年来新发现的重要铜矿床,矿床规模接近大型铜矿。矿床产于二叠系—三叠系层位中,总共发现矿体11条,其中Ⅰ-4号矿体为主矿体,深部隐伏产出,呈陡顷脉状矿体群,走向近SN,矿体延长638~2170 m,延深190~573 m,厚度为6.35~13.05 m,Cu的品位为1.00%~1.58%;赋矿围岩为玄武岩、灰岩及炭质页岩,总体上受近SN向的背斜构造及纵向断裂构造控制;近矿围岩蚀变主要为绿泥石化、阳起石化和碳酸盐化;矿石矿物主要为黄铜矿,次为斑铜矿、黝铜矿,脉石矿物主要为绿泥石、钠长石、碳酸盐类及石英等;矿石自然类型主要为硫化矿石,矿床工业类型为脉状铜矿。岩性及构造为本区主要控矿因素。矿床成因属热液充填交代型脉状矿床。
Jiaojiping copper deposit is located in the Yajiang metallogenic sub-belt of the southwest of Sanjiang metallogenic belt.It is an important copper deposit newly discovered in recent years in this area,the deposit scale is close to a large copper deposit.The deposit is hosted in the Permian-Triassic strata.A total of 11 orebodies have been discovered.Among them,No.I-4 orebody is the main orebody,which is concealed in the deep and a group of steep vein orebodies are present with a strike near SN.The length of orebodies is 638–2170 m,the depth of orebodies is 190–573 m,the thickness of orebodies is 6.35–13.05 m,and Cu grade is 1.00%–1.58%.The orebodies are generally controlled by the anticline structure and longitudinal fault in nearly SN direction.The ore-bearing rock is basalt,limestone and carbonaceous shale.The alteration of surrounding rock near the orebody is mainly chloritization,actinolitization and carbonation.The ore minerals are mainly chalcopyrite,followed by bornite and tetrahedronite,and the gangue minerals are mainly chlorite,albite,carbonate and quartz.The natural ore type is mainly sulfide ore and the industrial type of deposit is the vein copper deposit.Lithology and structure are the main ore-controlling factors in this area.The deposit genesis belongs to the vein deposit of hydrothermal filling metasomatic type.
作者
刘超
吴德成
LIU Chao;WU Decheng(Bayannur Western Copper Industry Co.,Ltd.,Bayannur 015000,Inner Mongolia,China)
出处
《矿产与地质》
2020年第6期1023-1029,共7页
Mineral Resources and Geology
关键词
铜矿床
成矿地质特征
控矿因素
脚基坪矿区
三江成矿带
copper deposit
metallogenic geological feature
ore-controlling factor
Jiaojiping mining area
Sanjiang metallogenic belt
