收稿日期: 2021-06-03
修回日期: 2021-09-27
网络出版日期: 2022-03-07
基金资助
西部矿业集团合作项目“会东大梁子铅锌矿床深部及外围成矿控制因素及找矿靶区预测研究”、“云岭学者”人才计划(2014)和云南省矿产资源预测评价工程实验室专项经费(2010)联合资助
Element Association Anomalies of Tectonite and Prediction of Concealed Orebodies in the 1 944 m Middle Section of Daliangzi Pb-Zn Deposit,Sichuan
Received date: 2021-06-03
Revised date: 2021-09-27
Online published: 2022-03-07
四川大梁子铅锌矿床位于扬子地块西南缘,明显受小江深断裂与普渡河深断裂之间的NWW-近EW和NE向构造控制。目前该矿山深部找矿前景不明朗,亟需探寻新的找矿思路和方法来实现新的找矿突破。本研究利用构造带中金属元素组合晕特征,进行隐伏矿体的预测。通过开展矿床构造精细解析,认为NWW-近EW向右行张扭性—扭张性控矿断裂(F15、F1等)与NW向张性—右行张(扭)性断裂及其次级褶皱组合形成的“负花状构造”,直接控制着矿床和矿体(脉)展布,均为同一应力场作用下的北东构造带的产物。在此基础上,基于1 944 m中段1∶1 000构造地球化学填图,绘制了Pb、Zn成矿元素组合(F2)和Pb、Zn单元素异常综合图,发现综合异常均沿NW-SE向展布,与已知矿体产状和主控断裂产状基本一致。结合矿床地质特征和异常特征,圈定了Ⅰ号、Ⅱ号和Ⅲ号重点找矿靶区。该研究成果为大梁子铅锌矿深部找矿工作指明了方向,也为同类型矿床深部找矿预测提供了一定的参考。
王海丰 , 龚红胜 , 冯志兴 , 韩润生 , 丁天柱 , 赵新跃 , 吴鹏 . 四川大梁子铅锌矿床1 944 m中段构造岩元素组合异常及隐伏矿体预测[J]. 黄金科学技术, 2021 , 29(6) : 781 -794 . DOI: 10.11872/j.issn.1005-2518.2021.06.068
The Daliangzi Pb-Zn deposit in Sichuan Province is located in the southwestern margin of the Yangtze block,which is obviously controlled by the NWW-trending—nearly EW-trending and NE-trending structure between the Xiaojiang deep fault and the Puduhe deep fault. At present,the deep prospecting of the mine is not clear,and it is urgent to explore new prospecting ideas and methods to achieve new prospecting breakthroughs. In this study,the characteristics of the metal-element association halos within mineralization-related fault zones are used to predict the concealed ore bodies. Firstly,the fine analysis of deposit structure is carried out,and it is believed that the combination of NWW—nearly EW-trending dextral extensional—torsional ore-controlling faults (F15,F1,etc.),the NW-trending extensional—dextral extensional (torsional) faults and its secondary folds forms a “negative flower-like structure”,which directly controls the distribution of deposits and ore bodies (veins),and is the product of the northeast structural belt under the same stress field. On the above knowledge,based on the 1∶1 000 tectonic geochemical mapping in the middle section of 1 944 m,the comprehensive maps of the Pb-Zn mineralization element association (F2) and Pb-Zn element anomalies are drawn. It is found that the comprehensive anomalies are all distributed along the NW-SE direction and are consistent with the occurrences of the known orebodies and the main ore-controlling faults. Then,combined with the geological characteristics and anomaly characteristics of the deposit,the No.Ⅰ,No.Ⅱ and No.Ⅲ key prospecting targets are delineated. The research results indicate the deep prospecting direction of the Daliangzi mining area,and also provide a certain reference for the deep prospecting prediction of similar deposits.
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