| 西藏甲玛斑岩矿床系统地质、蚀变、矿化的三维地质模型 |
| |
| 引用本文： | 唐,攀.西藏甲玛斑岩矿床系统地质、蚀变、矿化的三维地质模型[J].地质与勘探,2016,52(1):115-127. |
| |
| 作者姓名： | 唐 攀 |
| |
| 作者单位： | 成都理工大学,四川成都;中国地质科学院矿产资源研究所,北京;中国地质大学（北京）,北京;中矿联资源储量评审咨询中心,北京 |
| |
| 基金项目： | 地质大调查项目（12120113093700）、青年科学基金项目（41302060）、国家973项目（编号：2011CB403103）资助。 |
| |
| 摘 要： | 甲玛矿床位于西藏冈底斯成矿带东段,是公益性与商业性勘查结合取得的重要成果。目前已累计探明和控制铜资源量超过700万吨,共伴生钼、铅锌、金、银资源量均达到大型以上规模。本文在充分收集、整理甲玛矿床最新勘查资料、研究成果的基础上,运用MICROMINE软件三维建模及可视化技术,遵循点→线→面→体的构建原则,进行人机交互分析,构建了甲玛矿床地质、蚀变、矿体三维实体模型,并根据不同矿体品位分布变化的实际情况,对矿体模块模型进行克里格法或距离反比加权法品位插值,构建各种元素的矿化模型。并综合国内外对斑岩、矽卡岩矿床的研究新趋向对模型进行了地质解译,认为甲玛斑岩矿床是由斑岩钼铜矿体、矽卡岩铜多金属矿体、角岩铜钼矿体以及破碎带中独立金矿体构成的"四位一体"典型斑岩成矿系统产物,其中矽卡岩主要有接触带近端矽卡岩、层间构造中的远端矽卡岩以及受控于推滑覆构造产出的矽卡岩三种产出型式,由岩浆热液沿层间构造和推滑覆构造扩散交代大理岩和角岩形成;研究认为甲玛斑岩矿床具有典型的斑岩矿床蚀变系统,但蚀变分带有所差异,钾化带与青磐岩化带是在相对碱性条件下形成,而绢英岩化带与泥化带趋向于在相对酸性条件下形成。此外,大规模的角岩、矽卡岩对寻找深部斑岩矿体具有指示意义,甲玛斑岩矿体、角岩矿体仍具巨大的找矿潜力。因此,本研究构建的甲玛三维模型直观地展示了矿区地层、岩体、构造分布情况、赋矿层位、矿化品位分布规律以及蚀变分带特征,为甲玛矿床的成因、成矿规律总结、找矿勘查、矿山生成开发等综合研究提供重要的科学依据。
|
| 关 键 词： | 地质 蚀变 矿化 三维模型 甲玛斑岩矿床 西藏 |
| 收稿时间： | 2015/5/29 0:00:00 |
| 修稿时间： | 2015/10/6 0:00:00 |
The interpretation of three-dimensional model of geology, alteration and mineralization in Jiama porphyry deposit system, Tibet |
| |
| Tang Pan.The interpretation of three-dimensional model of geology, alteration and mineralization in Jiama porphyry deposit system, Tibet[J].Geology and Prospecting,2016,52(1):115-127. |
| |
| Authors: | Tang Pan |
| |
| Institution: | Chengdu University of Technology, Chengdu, Sichuan; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing; China University of Geosciences(Beijing), Beijing; China Mining Association, Beijing |
| |
| Abstract: | Jiama deposit is located in the east of Gangdese metallogenic belt, Tibet. It has been the important achievements of the combination of nonprofit with commercial prospecting. Proven and controlled resource of copper is more than 7 million tons, associating with molybdenum, lead, zinc, gold and silver resources. Each of these metals is of over a large-scale deposit currently. Fully based on the latest exploration database of the Jiama deposit and such research results, we build three-dimensional geological model of Jiama deposit indicating the relations between alteration, mineralization and geology using the technology of dimensional modeling and visualization in MICROMINE software, with the principle of point, line, surface to body to do interaction analysis. According to the actual distribution of metal grade in different ore-body, we apply the Clig interpolation or inversed distance weighted method on ore block to construct the mineralization models of every elements. Considering the new trends in and out domestic studies on porphyry and skarn deposits, we believe the Jiama porphyry deposit is the "four types in one deposit" classic porphyry system, composed of porphyry molybdenum-copper orebody, skarn copper polymetallic orebody, hornfels copper-molybdenum orebody and independent gold orebody in fracture zones. There are maily three types of skarn including proximal skarn within contact zone, distal skarn of inter-layer structure and skarn controlled by decollement. These skarn are formed by the metasomatism from magmatic hydrothermal fluids with marble and hornfels in the location of inter-layer and decollement structure. The Jiama porphyry deposit contains typical alteration system of porphyry deposit with slight difference of alteration zonation. Potassic and propylitic zone may be formed under relatively alkaline conditions while phyllic and argillic zone are formed in relatively acidic conditions. In addition, the outcropping of massive hornfels and skarn is indicated for hunting deep porphyry ore-body. Jiama porphyry and hornfel orebody remains enormous potential for prospecting. Therefore, in this study, Jiama three-dimensional model is constructed visually showing stratigraphy, intrusions, distribution of structure, ore-bearing layers, grade distribution and characteristics of alteration zonation, which could provide an important scientific basis for genesis of Jiama deposit, mineralization law, prospecting, exploration and other comprehensive reseraches. |
| |
| Keywords: | Geology alteration mineralization three-dimensional model Jiama porphyry deposit Tibet |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地质与勘探》浏览原始摘要信息 |
| 点击此处可从《地质与勘探》下载免费的PDF全文 |
|
