基于图切地质剖面的区域成矿地质体三维建模与资源评价——以桂西南地区锰矿为例

发布时间：2018-02-24 19:46

本文关键词： 图切地质剖面地质体三维建模锰矿三维预测资源量　出处：《吉林大学学报(地球科学版)》2017年03期 　论文类型：期刊论文

【摘要】：以成矿规律研究和成矿条件分析为基础的二维成矿定量预测方法难以精确表达含矿地层的三维空间分布情况,导致其预测结果的可靠性差。本文针对矿产资源预测评价中的真三维地学分析需求,以平面地质图和图切地质剖面图为三维地质建模的数据源,按照线框架建模的技术思路,由剖面轮廓线和地面地质界线联合重构了成矿地质体的三维表面,较好地表达了桂西南地区成锰地质体在三维空间中的分布情况。同时,为了分析三维空间中锰矿资源量的分布情况,本文采用规则体元将研究区的三维地质空间分割为连续场,并结合区域锰矿二维成矿定量预测的成果,获得了研究区1 000m以浅含锰地层中锰矿资源量的三维空间分布:研究区锰矿资源量主要集中在上泥盆统(以五指山组为主,5 036万t)和下三叠统北泗组(3 447万t);而下石炭统大塘组资源量仅为566万t,以前的二维预测对该地层内赋存的锰矿资源量估计偏高。三维预测较好地反映了含锰地层三维形态对锰矿分布的控制作用,为研究区锰矿定量预测提供了新的技术手段。
[Abstract]:Based on the study of metallogenic law and the analysis of metallogenic conditions, the two-dimensional quantitative metallogenic prediction method is difficult to accurately express the three-dimensional spatial distribution of ore-bearing strata. This paper aims at the demand of true 3D geoscience analysis in mineral resources prediction and evaluation, takes plane geological map and map cut geological section map as the data source of 3D geological modeling, according to the technical train of thought of line frame modeling. The 3D surface of the ore-forming geological body is reconstructed from the profile of the profile and the surface geological boundary, and the distribution of the geological body of manganese in the southwest of Guangxi is well expressed in the three-dimensional space, at the same time, the distribution of the ore-forming geological body in the three dimensional space is well expressed. In order to analyze the distribution of manganese ore resources in three dimensional space, the 3D geological space of the study area is divided into continuous fields by regular volume element, and combined with the results of quantitative prediction of two-dimensional mineralization of regional manganese ore. The three dimensional spatial distribution of manganese mineral resources in shallow manganese bearing strata in the study area is obtained. The manganese ore resources in the study area are mainly concentrated in the upper Devonian (Wuzhishan formation, 50.36 million t) and the lower Triassic Beisi formation (34.47 million t / t). The resources of Datang formation of Lower Carboniferous are only 5.66 million t, and the former two dimensional prediction is higher than that of the other two dimensional prediction. The three dimensional prediction well reflects the controlling effect of the three dimensional shape of manganese bearing strata on the distribution of manganese ore. It provides a new technique for quantitative prediction of manganese ore in the study area.
【作者单位】：中南大学有色金属成矿预测与地质环境监测教育部重点实验室/地球科学与信息物理学院;中国地质大学地质过程与矿产资源国家重点实验室;美国犹他大学地质与地球物理系;
【基金】：国家自然科学基金项目(41302259,41472302) “十二五”国家科技支撑计划课题(2011BAB04B10)~~
【分类号】：P618.32;P628

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