材料期刊网

对矿区的控矿断裂构造及其构造叠加晕进行研究,建立构造叠加晕的模型,并对深部进行成矿预测.认为控矿断裂构造形成于燕山期火山活动,容矿构造的优势方位为NE63°;Ag与Au元素成矿最密切,前缘晕元素为Hg、Sb、As和Ba,近矿晕元素为Au、Ag、Cu、Pb和Zn,尾晕元素为Co、Ni、Mn、W、Mo和Bi;构造叠加晕具明显的反分带特征,尾晕元素Mn、Bi出现在上部,前缘晕元素Hg、Sb、Ba出现在中部,近矿元素Zn和前缘晕元素As处于下部,以及地球化学参数的变化,均指示深部有盲矿体的存在;预测结果表明:0线深部在250~50 m标高内出现预测的盲矿体,其中心定位于200 m标高左右,倾向延深长度为100 m左右.

Luoshan Au-Ag deposit is located in the center of NE-striking Yuyao-Longquan uplift belt, which is a significant precious metals mineralization zone in South China. The metallogenic structures and primary halo of this deposit were studied in order to establish the structural superimposed halo model and forecast deep mineralization. The analysis of the tectonic evolution indicates that metallogenic structures are formed during volcanic activity in Yanshan period. The dominant orientation of metallogenic structures (NE63°) was determined by statistical analysis of the ore-bearing structure. Ag and Au are found to be close related to mineralization after correlation analysis on Au、Ag、Cu、Pb, Zn, Co, Ni, Mn, Ba, As, Sb, Bi, Hg, W, Mo elements. R-type cluster analysis suggests the element combination characteristics are as follows: Hg, Sb, As, Ba (front halo)—Au, Ag, Cu, Pb, Zn (near-ore halo)—Co, Ni, Mn, W, Mo, Bi (rear halo). Axial zoning sequence of the zero-line elements, determined through Grigorian method, is Ag-Mn-Bi-Hg-Sb-Ba-Cu-Au-Pb-Mo-As-Zn-W-Co-Ni. Mn and Bi (rear halo elements) are in the upper zone. Hg, Sb, Ba (front halo elements) are in the middle zone; Zn (near halo element) and As (front halo element) are in the lower zone. The reverse zoning sequence indicates that there is a blind ore body located at depth of this deposit. Based on the ore-body characteristics, predicted blind ore body is located at the zero line depth of 250?50 m, and the length along dipping direction is around 100 m.