陕西朱家河地区土壤地球化学锰异常特征及含矿性分析

GEOCHEMICAL MANGANESE ANOMALIES AND PROSPECTING POTENTIAL OF ZHUJIAHE AREA OF SHAANXI PROVINCE

本文以区域地质特征为基础,对位于勉略锰成矿带东段的朱家河地区锰矿床土壤地球化学特征及找矿标志进行了详细的研究。研究表明Mn异常呈不规则条带状沿南东向集中展布于上古生界金家河岩组绢云母石英片岩夹薄层状泥质灰岩中,长990～5 490 m,宽200～1 150 m,异常最大值52 601×10^(-6),平均值5 748×10^(-6)。高值异常区连续性好,强度高,峰值中心明显,且Mn与P、Cu元素有一定的共生组合与成生联系。通过异常查证已圈定出3条碳酸贫锰矿体,矿体呈层状、似层状产于绢云母石英片岩夹薄层灰岩中,控制长360～930 m,真厚0.82～1.63 m,锰品位10.39%～24.50%,含矿岩性为含锰石英片岩夹灰岩透镜。根据对成矿地质背景、地球化学异常特征及异常查证结果继而总结出了该区地球化学异常含矿性特征规律及找矿标志,以期为进一步扩大寻找优质锰矿体提供参考。

Based on the regional geological characteristics, this paper makes a detailed study of the soil geochemical characteristics and ore-prospecting indicators of manganese deposits in the Zhujiahe area, which is located in the eastern section of the Yingluo manganese metallogenic belt.Studies have shown that Mn anomalies are irregularly banded along the South-East direction and concentrated in the thin layered argillaceous limestones of sericite quartz schist in the Upper Paleozoic Jinjiahe Formation, 990 ～ 5 490 meters long, 200 ～ 1 150 meters wide,the abnormal maximum 52 601 × 10^（-6）, the average 5 748 × 10^（-6）. The high-value anomaly zone has good continuity, high intensity, and obvious peak center, and there is a certain symbiotic combination of Mn and P, Cu elements and the connection between adult and adult.Through the anomaly investigation, 3 manganese ore bodies have been delineated. The ore body is layered and stratified in sericite quartz schist, with a length of 360 ～ 930 meters and a thickness of 0.82 ～ 1.63 meters. Grade 10.39% ～ 24.50%, ore lithology is manganese-containing quartz schist. Based on the metallogenic geological background, characteristics of geochemical anomalies and anomaly verification results, the ore-bearing features of the geochemical anomalies and ore-prospecting signs were summarized in order to provide references for further exploration of high-quality manganese ore bodies.