建立地质-地球化学找矿模型 ——以西藏甲玛铜多金属矿床为例

区域地球化学定量预测是全国重要矿产资源潜力评价项目的组成部分之一。为了提高其预测结果的可信度，科学合理的地质-地球化学找矿模型是关键，也是地球化学找矿预测区圈定和资源量估算过程中相似类比的“标准样本”。在中国地球化学找矿模型历史沿革的基础上，提出了地质-地球化学找矿模型建立的基本思路、理论基础和主要内容。通过收集、整理、归纳西藏冈底斯成矿带甲玛“三位一体”（夕卡岩型-角岩型-斑岩型）铜多金属矿床的最新资料，构建了甲玛典型铜多金属矿床的地质-地球化学找矿模型。该模型由区域地质特征、矿床地质特征、矿床地球化学特征、地球化学异常特征、地质-地球化学特征、重要控矿因素6个方面组成。

The construction of the geological and geochemical prospecting model: A case study of the Jiama copper-polymetallic deposit in Tibet

Regional geochemical quantitative prognosis is a part of the project of national important mineral resources evaluation. For the purpose of improving the reliability of prediction results, the building of scientific and reasonable geological and geochemical prospecting model is very crucial, and is also regarded as the "standardized sample" for geochemical prospecting areas and resources calculation. Firstly, through a historical retrospect of the geochemical prospecting model in China, this paper has discussed basic strategy, theoretical foundation, and major contents of the prospecting model. Secondly, based on the above idea and many latest literatures, this paper presents a case of geological and geochemical prospecting model. The prospecting model is for the Jiama trinity deposit consisting of three types of ore-bodies i.e., skarn-type, hornfels-type, and porphyry-type, in the Gangdise metallogenic belt. The model comprises six aspects, which are regional geological characteristics, geological characteristics of ores, geochemical characteristics of ores, geochemical anomaly characteristics, summary of geological-geochemical characteristics, and dominant ore-control factors.