山东省沂源县金星头勘查区地质地球化学特征及找矿前景分析

Analysis on Geological and Geochemical Characteristics and Ore Prospects in Jinxingtou Exploration Area in Yiyuan County of Shandong Province

摘要:

山东省沂源县金星头地处沂源—沂南金及多金属成矿带北部，该成矿带位于中国东部矽卡岩金多金属矿带中北部，属于环太平洋带组成部分。通过对该区的地质、地球化学特征等分析，运用1∶1万土壤地球化学测量方法，发现了一批以Au为主的化探异常，对部分异常运用岩石地球化学测量和探槽进行查证，发现具有工业品位的金铜矿（化）体5处，提出下一步找矿的工作重点地段，即在中生代燕山晚期中偏碱性或中酸性侵入杂岩体与寒武纪朱砂洞组、馒头组白云岩、灰岩等接触部位及两侧寻找接触交代型（矽卡岩）金铜矿床。

Abstract:

Jinxingtou area in Yiyuan county of Shandong Province locates in north of YiyuanYinan Aupolymetallic metallogenic belt. This metallogenic belt lies in the north and central part ofskarn type Au and polymetallic metallogenic belt in eastern China. It belongs to one part of the Pacific rim metallogenic belt. Through analysis on geological and geochemical characteristics, by using soil geochemical survey method with the scale of 1∶10000, a certain amount of Audominated geochemical anomalies have been found. After further rock geochemical survey and prospecting trench to some anomalies, 5 AuCu ore bodies with industrial grades have been found, and key areas for further exploration have been proposed. It is regarded that contactmetasomatics (skarntype) AuCu deposits can be found in contact areas and both sides of alkalineintermediate or intermediateacid intrusive complex rocks formed in late Yanshan period of Mesozoic with dolomites and limestone of Cambrian Zhushadong and Mantou formation.