雪峰山中段桐溪金矿田控矿构造及成因

Ore-controlling structures and genesis in the Tongxi gold fieldin the central segment of the Xuefeng Mountains

通过桐溪金矿田矿区构造形迹特征的调查研究,及构造对该矿田矿体产出状态分布规律的制约作用分析,并以构造、蚀变、矿化演变的同步性解析为基础,推断NE向构造为矿区的主要导矿、容矿构造,NW向断裂为主要的容矿构造。结合矿石的化学成分及其稳定同位素的测试分析等,提出了桐溪金矿田经历了新元古代物源建造期、加里东前造山期和最终在印支—燕山期岩浆侵入期过程中成矿物质在有利的构造部位富集的多阶段成矿模式。

The authors studied the tectonic features in the Tongxi gold field and analyze the structural control on the occurrence of gold orebodies of the gold field and the relationships of structure,alteration and mineralization.On the basis of these studies and analyses they infer that the NE-trending structures are the dominant ore-conducting and housing structures and that the NW-trending faults are the dominant ore-housing structure.On that basis combined with the chemical composition of the ores and their stable isotope analysis,they propose a multi-stage ore-forming model,i.e.after the gold field experienced the Neoproterozoic provenance construction stage and the Caledonian pre-orogenic stage,the ore-forming material was finally concentrated in favorable tectonic loci during the Indosinian-Yanshanian magmatic intrusion.