李胜苗，田磊，杜云，邹源，樊晖，章靖

摘 要 沙坪岩体型白钨矿床位于南岭成矿带西段苗儿山岩体北西部，是近年来新发现的矿床。矿体由苗儿山岩体北段志留纪第六次侵入细粒含电气石二长花岗岩小岩株发生全岩矿化所形成;矿床地质特征及岩矿鉴定资料显示矿石无明显的热液蚀变的特征，推断矿床类型为细粒花岗岩型白钨矿床，成矿年龄与岩石成岩年龄一致，为加里东期;该矿床的发现表明南岭地区不仅只是经历了燕山期大规模岩浆成矿事件，也经历了加里东期成岩成矿事件;在地质找礦工作相对薄弱的南岭成矿带西段广泛发育加里东期花岗岩，今后应注意该地区同类型矿床的找矿工作。

关键词 白钨矿床;细粒花岗岩型;地质特征;找矿意义;南岭;沙坪

中图分类号：P611 文献标志码：A

Geological Characteristics and Prospecting Significance of Shaping Rock-type Scheelite Deposit in Miaoershan Area， Nanling

Li Shengmiao， Tian Lei， Du Yun， Zou Yuan， Fan Hui， Zhang Jing

（Hunan Institute of Geological Survey， Changsha Hunan 410116）

Abstract： Scheelite deposit with Shaping Rock-type， which is a newly discovered deposit in recent years， is located in the northwestern part of the Miaoershan pluton in the western section of the Nanling metallogenic belt. The ore body is formed by the whole-rock mineralization of the 6th Silurian intrusion of the fine-grained tourmaline-bearing monzonitic granite in the northern section of the Miaoershan rock body. The geological characteristics of the deposit and identification data of rock and mineral show that the ore has no obvious hydrothermal alteration characteristics. It is inferred that deposit type is fine-grained granite type scheelite deposit. The mineralization age is the same as the rock diagenesis age， which is Caledonian. The discovery of this deposit indicates that the Nanling area not only experienced large-scale magmatic and mineralization events in the Yanshanian period， but also experienced Caledonian diagenesis and mineralization events. Caledonian granites are widely developed in the western part of the Nanling metallogenic belt where geological prospecting is relatively weak. In the future， attention should be paid to prospecting for similar deposits in this area.

Keywords： scheelite deposit; fine-grained granite type; geological characteristics; prospecting significance; Nanling; Shaping

南岭地区广泛发育加里东期、印支期和燕山期花岗岩，与之有关的以钨锡为主的有色金属、稀有金属矿产资源十分丰富[1-2];其产出有多个大型、超大型矿床，受到诸多学者的高度关注。众所周知，燕山期花岗岩与南岭地区大规模成矿关系十分密切 [3-4]，但加里东期花岗岩的成矿作用和成矿规模比燕山期花岗岩小的多，对其认识也相对较薄弱。随着各类地质大调查项目的实施，加里东期成矿作用也逐渐被相关学者所关注[5-6]。沙坪白钨矿床的发现，进一步佐证南岭加里东期存在大规模的成矿作用，对整个苗儿山地区甚至南岭成矿带西段具有十分重要的找矿意义。……