摘要
在研究区1:50万化探扫面圈定异常的基础上,进一步对异常进行了1:10万化探普查和异常查证,圈定综合异常9处,据此进行的矿产普查工作新发现了新疆叶城帕合堡铅锌等一系列矿点,表明该地区是一个找矿新领域。帕合堡铅锌矿位于塔里木地块与羌塘地块接合部,矿体主要赋存于元古界库浪那古群(PtKL)矽卡岩化大理岩中,该套地层富集系数>1.1的成矿元素有Au、Mo、Pb、Zn。矿体形态复杂,主要呈透镜状、扁豆状、枝叉状等,呈EW向带状分布,总体走向近SN—NE,倾向SE,倾角在30°～70°之间。单矿体地表出露长约73～134m,宽1.2～15.4m,一般宽约5～8m,平均厚度为5.43m,矿体Pb+Zn品位1.43～12.56×10-2。矿石的自然类型全部为氧化矿,矿石矿物主要由方铅矿、闪锌矿组成,其它有黄铁矿、磁黄铁矿。脉石矿物主要为方解石和白云石。矿体中褐铁矿化蚀变较强。矿床属于与构造破碎有关的沉积变质—中低温热液改造—交代型,成矿时代主要为华里西期。
On the base of 1：500,000 geochemical exploration, general investigation of 1：100,000 geochemical exploration and verify for geochemical abnormal were done, and 9 parts geochemical abnormal were definition in the study area. According to above the abnormal, search for minerals were done, too. Then Pahebao lead-zinc ore deposit and other polymetallic ore were discovered in the area. It is indicated that the study area is a new minerals prospecting domain. Pahebao lead-zinc ore deposit lie in a junction place of Tarim massif and Qiangtang block. The ore deposit main occurrence in skarnization marble of Proterozoic Kulangnagu group （PtKL） in which metallogenetic elements ,as Au,Mo,Pb,Zn, were enrichment （enrichment coefficient 〉 1）.The shape of ore body is complicated, and main presented as lensing, flatschig and branch, and et al. They distributed in zonal arrange- ment, trend SN-NE, inclination SE and dip 30°-70°.The single ore body outcrop in earth surface length is 73- 134m, width1.2-15.4m（general 5-8m）, average thickness 5.43m. The grade of Pb＋Zn1.43-12.56x10^-2.The natural Class of ore is all oxidation ore. The ore minerals main composed of galena, sphalerite, accessory pyrite, dipyrite and gangue minerals main calcite and dolomite. Ferritization is relatively obvious. According to above, Pahebao lead-zinc ore deposit fall in diagenism-middle low temperature hydrothermal reform-metasomasis type. Metallogenetic epoch mainly were Variscan.
出处
《甘肃地质》
2009年第1期28-33,65,共7页
Gansu Geology
关键词
新疆
帕合堡铅锌矿
地球化学特征
Xinjiang
Pahebao lead-zinc ore deposit
characteristics
