福建泰宁长兴金矿床地质特征及成因探讨

On the Geologic Characteristics and Genesis of the Changxing Gold Deposit in Taining County,Fujian Province

长兴金矿床主要产于长兴岩体钾长混合花岗岩及其外接触带交溪组变质岩中,矿体受断裂(裂隙带)控制,呈透镜状、不规则脉状分布,综合分析认为交溪组变质岩为初始矿源层,加里东期混合岩化使金在有利构造部位形成初步富集,印支晚期-燕山早期构造-岩浆热液叠加成矿,矿床成因类型为中温热液充填交代型金矿床,其工业类型为破碎带蚀变岩型金矿床。

The Changxing gold deposit exists in the potash feldspar mixed granite of the Chanxing Rock Mass and in the Mesoproterozoic Jiaoxi Formation metamorphic rocks of its exocontact belt. The orebody is controlled by the faults （fractured zones） and is distributed with a lenticular or irregular veiny form. Based on the multipurpose analysis results, it is considered that the Mesoproterozoic Jiaoxi Formation metamorphic rocks are the native source beds, and that the migmatization in the Caledonian period makes the gold elements enriched in the favorable structures and the superimposition of the structures and magmatic hydrothermal solution makes for the formation of gold ores in late Indosinian and early Yanshanian periods. According as the genetic type of mineral deposits, the deposit belongs to the gold deposit of moderate temperature hydrothermal filling and metasomatic type and by the industry type of mineral deposits it remains with the gold deposit of the ruptured-zone altered rock type.