青海省都兰小卧龙锡、铁、钨多金属矿地质特征及找矿标志

Geological feature and exploration sign of Xiaowolong tin-iron-tungsten polymeallic deposit in Dulanxian in Qinghai province

小卧龙锡铁钨多金属矿床产于下古生界奥陶-志留系滩涧山群与酸性侵入岩之间的矽卡岩接触带中,含矿矽卡岩带总体呈NE向展布。矿床由38条铁矿体和29条锡多金属矿体组成。锡铁钨多金属矿可划分为矽卡岩期、石英-硫化物和表生期三个成矿期。矿体具有上铁下锡,东铁西锡的分布特征。根据矿床特征和矿体的空间分布规律预测深部岩体锡多金属矿的找矿前景良好,围岩中注意寻找云英岩型和石英脉型锡多金属矿。

Tin-iron-tungsten polymeallic deposit, which is located at the skarn belt in NE-strike between the Tanjianshan Group of Ordovician-Silurian system and acidic igneous rocks, are composed of 38 iron orebodies and 29 tin polymetal orebodies. The mineralization period can be divided into skarn, quitz-sulfide and supergene stages. The distribution feature of orebody is that iron is in the upper and tin is in the lower, and that iron is in the east and tin is in the west. According to the deposit feature and the space distribution regularity, it is proposed that the prospecting foreground is good for the lower part of acidic igneous rocks. In the adjacent of wall-rocks there must be paid more attention to search for tin polymetal deposits of greisen and quitz-vein type.