胶东望儿山金矿床石英热释光和晶胞参数特征及其找矿意义  

Characteristics and Prospecting Significance of the Thermoluminesence and Cell Parameters of Quartz from the Wang'ershan Gold Deposit,Jiaodong Peninsula,China

作　　者：张龙[1,2] 李胜荣[1] 朱随洲 刘冉[1] 李文涛[1] 宋英昕[1,3] 王碧雪[1] 崔秋波 闵祥吉 王春[4] 

机构地区：[1]地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院,北京100083 [2]武警黄金第一支队,黑龙江牡丹江157000 [3]山东省地质科学实验研究院,山东济南250013 [4]中国冶金地质总局山东正元地质勘查院,山东济南250101

出　　处：《现代地质》2016年第4期792-801,共10页Geoscience

基　　金：中国地质调查局工作项目“山东郯庐断裂两侧大型-超大型金矿床成矿地球动力学背景、过程与定量评价”(1212011220926);中国地质调查局项目“山东省莱州市焦家金矿望儿山矿区接替资源勘查项目综合研究”(12120113082700);教育部高等学校博士学科点专项科研基金项目“郯庐断裂两侧偏对称成矿的深部过程”(20130022110003)

摘　　要：望儿山金矿的成矿过程可划分为黄铁矿-石英阶段、石英-黄铁矿阶段、多金属硫化物阶段和石英-碳酸盐阶段。分别对4个成矿阶段中的石英进行了热释光和晶胞参数测定。热释光结果表明,本区石英热发光曲线以中温峰明显的单峰和不对称的双峰为特征。主成矿阶段的石英发光曲线开始出现双峰,曲线复杂,发光强度最高,变化最大,这也是本区重要的找矿标志。Ⅲ号脉的深部石英热发光曲线出现肩峰和双峰,峰型复杂,推测其下部有较好的成矿前景。石英晶胞参数在时空上呈现规律性的变化,主成矿期石英晶胞参数a0、c0、v0都较大。（Δa0/a0）/（Δc0/c0）变化范围为1.65-4.40,说明本区微量元素进入石英有填隙和置换两种方式,以填隙为主。半高宽变化趋势和晶胞参数一致,因此半高宽也可以区分石英的含金性。深部石英晶胞参数和半高宽仍较大,所以推测下部仍有较好的成矿前景。Gold mineralization of the Wang＇ershan deposit can be divided into 4 stages including pyrite-quartz stage,quartz-pyrite stage,polymetallic sulfide stage and quartz-carbonate stage. The thermoluminesence and cell parameters of quartz from the 4 stages were analyzed in this paper. The characteristics of the thermoluminesence curves show obvious single peak at middle temperatures for the quartz from the early and later stages and asymmetric twin peaks with strongest emitting intensity and complexity for the quartz from the main minerali-zation stage. It is an important prospecting criteria for gold in this area. At the depth of the veinⅢ,the thermoluminesence curves of the quartz appear to have shoulder-like and twin peaks,implying a good mineralization prospect downwards. The cell parameters of the quartz show a regular variation in time and space. In the main mineralization stage,the quartz cell parameters a0,c0 and v0are relatively large with（ Δa0/ a0） /（ Δc0/ c0） ranging from 1. 65 to 4. 40,suggesting that trace elements are combined into quartz by gap filling and replacement with interstitial mode as the major way. The change of half-peak bandwidth of the thermoluminesence is as the same as the cell parameters for quartz; therefore,the half-peak bandwidth can also be taken as a criteria for gold-rich and gold-poor quartz grains. According to the spatial variation tendency of the cell parameters and half-peak bandwidth of quartz,the authors infer that the unmined region at large depth is presumably profitable for further gold mineralization prospect.

关 键 词：胶东 望儿山金矿 石英 热释光 晶胞参数 

分 类 号：P578[天文地球—矿物学]