中文摘要：

渣滓溪钨锑矿床位于湘西雪峰山弧形构造带的中段，是我国典型的脉状充填型锑矿床。本文对渣滓溪矿区不同产状的白钨矿进行了Sm-Nd和Sr同位素研究。研究表明，渣滓溪矿区白钨矿的Sm／Nd变化范围相对较宽（0．36～0．63），^143Nd/^144Nd为0．51211～0．51288；在^147Sm／^144Nd-^143Nd／^144Nd图解中，该矿白钨矿样品没有明显的线性分布趋势，无法厘定出该矿的准确成矿时间。渣滓溪白钨矿的εNd（t）明显可分为两组（-10．2～-14．7和-3．79～＋0．01），其成矿流体中的Nd主要有两个来源，一部分可能来自晚元古代地层或下伏陆壳基底的碎屑岩，另一部分很可能与冷家溪群的基性、超基性岩有关。与Nd同位素不同，渣滓溪成矿流体中Sr同位素组成均一化程度较高，该矿白钨矿^87St／^86Sr为0．7304-0．7329；该矿这种明显富放射成因^87Sr的成矿热液，排除了成矿流体主要来自海水和赋矿围岩作为唯一矿源层的可能性，下伏陆壳的结晶基底很可能是这种高放射成因Sr的提供者。沃溪和渣滓溪白钨矿Sr-Nd同位素组成的对比研究表明，两矿区的成矿物质来源有所不同，前者应来自一种更古老、更成熟、更富放射成因Sr的下伏陆壳基底。

英文摘要：

The Zhazixi W-Sb deposit, located in the middle part of Xuefengshan arc tectonic zone, is one of typical vein-filled hydrothermal deposits in China. Sm-Nd and Sr isotope systematics of scheelite from the Zhazixi W-Sb deposit have been investigated in this paper. It shows that there exists a relatively wide variation in Sm/Nd ratios for the scheelite samples collected from this deposit （0. 36-0. 63）, and its ^143Nd/^144 Nd values fall in the range of 0. 51211-0. 51288. Scheelite samples are scattered in the diagram of ^147Sm/^144Nd-^143 Nd/^144 Nd, which has no geochronological implications for W-Sb mineralization in the studied deposit, and it is impossible to define exact metallogenic time for the deposit. Nd isotope initial compositions of the samples can be classified into two groups, -10.2--14.7 and -3.79-＋0.01. The ore-forming fluid are mainly derived from two sources, one probably originating from the Prototerozoic sequence or underlying terrigenous basement elastic rocks and the other probably related to the basic/ ultrabasic rocks of the Lengjiaxi Group. Contrary to the Nd isotope, Sr isotope compositions of the mineralized fluids in the Zhazixi W-Sb deposit are relatively homogenized, and the ^87Sr/^86 Sr values of scheelite vary from 0. 7304 to 0. 7329. This kind of high radiogenic Sr excludes the possibility that the oreforming fluid of the Zhazixi deposit is predominately derived from seawater and that host strata are sole sourebed for the ore-forming materials of the studied deposit. Comparison with the adjacent Woxi Au-Sb- W deposit reveals both deposits display distinct differences in sources of ore-forming materials; the sourcebed of the Woxi deposit should be an older, more mature and more radiogenic Sr-rich underlying basement.