中文摘要：

天堂矿床是粤西地区以泥盆系上统天子岭组灰岩为围岩的大型矽卡岩型铜铅锌多金属矿床，矿体呈似层状、层状、透镜状、不规则状等产出在矽卡岩和矽卡岩化大理岩中，矿区发育石榴子石、透辉石、绿帘石、硅灰石、绿泥石等蚀变矿物，金属矿物主要包括黄铜矿、黄铁矿、方铅矿和闪锌矿等。本文以主要矽卡岩矿物为研究对象，利用电子探针技术对其矿物学特征进行研究。电子探针分析结果表明：天堂铜铅锌多金属矿床矽卡岩属于交代矽卡岩中典型的钙矽卡岩。石榴子石以钙铝榴石一钙铁榴石系列为主，从早到晚具有从钙铝榴石为主到钙铁榴石为主的演化趋势，说明成矿流体由酸性向碱性演化。辉石以透辉石为主，石榴子石和辉石的矿物组分分别为A山-6～96-47Grs210～94．28（erp＋Sps）0．4-388和Di88．5-95．09Hd3．3-9．76Joo．28-3．98，其较大的成分变化特征反映出矽卡岩不是在一个完全封闭的平衡条件下形成的。帘石主要为绿帘石，含有少量的黝帘石。矿物成分分析表明辉石的Mn／Fe比值和矿化金属元素存在一定的联系。通过矽卡岩矿物学特征分析，进一步证实天堂铜铅锌多金属矿床是花岗岩类岩浆交代灰岩而形成的典型矽卡岩型矿床。

英文摘要：

The large Tiantang Cu-Pb-Zn polymetallic skarn deposit in Yuexi area is hosted m limestone of evo nian Tianziling Formation, and the ore bodies occur in the skarn and skarnized marble in stratoid, lamellar, lenticular and irregular forms. Metallic minerals consist mainly of chalcopyrite, galena, sphalerite and pyrite, whereas gangue minerals are composed of garnet, diopside, epidote, wollastonite, chlorite etc. With skarn minerals as the study object and by using electron microprobe technology, the authors investigated the mineralogical characteristics. Electron microprobe analyses show that the skarns in the Tiantang Cu-Pb-Zn polymetallic depositbelong to typical calcic skarns. Garnets in the ore deposit are mainly andradite-grossularite and varied with time from grossular to andradite, suggesting that the ore-forming fluid had a evolutionary trend from acidic to basic. Augites are mainly diopside. Components of garnet and proxene are Adr4.60-96.47 Gr 10-94. 28 （Prp ＋ SPS）0.41-3.88 and Di88.51-95. o9 Hd3.31-9.76 JO0.28-3.98, respectively, and their wide compositional variation range suggests that skarns were not formed under a totally enclosed equilibrium condition. The end member of the epidote group is dominated by epidote, and contains a little zoisite. The Mn/Fe ratio of pyroxene may be related to mineral metals. Characteristics of skarn in the Tiantang Cu-Pb-Zn polymetallic deposit shows that it is a typical skarn deposit resulting from the replacement of the marble by granitoid magma.