宋禹霖+范柱国+宋尚鑫
摘要: 武定地区区域矿产资源极丰富,矿区经过40多年的勘查,共发现各类矿点百余个,综合研究表明,武定县平地~左所铜矿床类型以“东川式”铜矿最重要,分布在金钟罩、鸡冠山、油基田、周家箐、走马地、黄龙河、牛德庄等地;次为稀矿山式,主要在蒿枝地,走马地等地。“东川式”铜矿:落雪组底部过渡层,“稀矿山式”铁铜矿:因民组下部,同生断裂旁侧,古火山机构中的火山洼地,火山旋回的中上部,富含Na2O的细碧角斑岩系,硅质岩、萤石岩、钠长岩等喷流岩以及黑云母、绿泥石火山凝灰岩的分布区。
Abstract: Regional mineral resources of Wuding region are extremely rich, after 40 years of mining exploration, all kinds of hundred mines were found. Comprehensive studies show that, "Dongchuan style" copper mine is the most important mine in Wuding Pingdi-Zuosuo copper deposits, which located in Jinzhongzhao, Jiguanshan, oil-based fields, Zhoujiaqing, Zoumadi, Huanglong River, Niudezhuang etc.; Dilute mine type is the second important, mainly in Artemisia sticks, Zoumadi and other places. "Dongchuan style" copper mine: bottom snow group buffer layer; "dilute mine type" iron-copper: due to the lower part of the public group, contemporaneous faults flanking the ancient volcano volcanic depressions institutions, volcanic cycles in the upper rich Na2O of spilite porphyry system, chert, fluorite rock, rock and other jet albite rock and biotite, chlorite volcanic tuff distribution.
关键词: 地质特征;成矿条件;找矿方向;武定县铅锌矿
Key words: geological characteristics;metallogenic condition;prospecting direction;lead and zinc ore of Wuding County
中图分类号:P612 文献标识码:A 文章编号:1006-4311(2014)17-0015-03
0 引言
武定地区大地构造位置位于扬子古陆西缘川滇背斜(康滇地轴)云南段的中部西边,属扬子地台西缘的一个次级构造单元——昆阳裂谷系(禄武裂陷槽)。
刘肇昌[1]等(1995、1996)以安宁河-绿汁江断裂为界,将扬子古板块西南缘划分为东西两部分,西部为西康滇联合古地体,东部为川滇被动大陆边缘裂谷系[2],裂谷系可进一步划分为堑垒相间的五个拗拉槽或裂陷槽(图1),矿区即属其中的二级单元——禄武裂陷槽范围。
昆阳裂谷[3]经历了中元古和新元古两个时期近10亿年的演化(1950~850Ma),包括中元古代早期初始裂陷阶段(1950~1700Ma)、中元古代中期全面裂陷阶段(1700~1400Ma)、中元古代晚期岩石圈挠曲拗陷沉降阶段(1400~1000Ma)及新元古代碰撞回返褶皱封闭(1000~850Ma)四个发展阶段,沉积了十一组地层,地层总厚度最大17343米,最小厚度5531米,相差三倍以上,各组地层厚度相差较大,甚至有的数百米距离内即见厚度剧变,这是由于裂陷槽内生长断层发育导致的必然结果。……