Numerical simulation-based targeting of the Au mineralization within the Hongbu Altered Rock type gold deposit, Eastern Shandong Peninsula, China

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Geochemical Exploration Pub Date : 2024-07-27 DOI:10.1016/j.gexplo.2024.107557
Xunyu Hu , Ruyi Chen , Guangxian Liu , Kun Wang , Hui Yang , Yuhua Chen , Jie Zhou , Guoyu Zhou
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Abstract

Altered rock type deposits are significant gold deposits widely distributed throughout the world, having important economic and industrial value. The Eastern Shandong Peninsula is the third largest gold mining camps in the world with known gold reserves of more than 5300 tons. The majority of the gold deposits here are located in three main orefields, namely the northwest Jiaodong (Laizhou-Zhaoyuan), the Qixia-Penglai-Fushan, and the Muping-Rushan orefields. The Hongbu deposit is a medium-sized altered rock type deposit within the northwest Jiaodong orefield. With decades of mining, the Hongbu deposit faces the dilemma of resource depletion and loss of undigitized data. Therefore, prospecting and exploration have to focus on deep and peripheral areas of known Au mineralization. This study built a three-dimensional model of the Hongbu deposit and sliced it to obtain nine cross-sections to conduct multi-field coupled numerical simulation (including heat conduction, fluid migration, chemical reaction, and material migration). Locations with relatively developed Au mineralization (the top 15 % within the concentration range of Au) are defined as having metallogenic potential, which are highlighted and projected to the geological map of the Hongbu district. The results also show that the spatial distributions of Au mineralization within these nine sections are different, indicating that the formation of Au mineralization is controlled by the morphology of the Hexi fault (other simulation parameters of these nine sections are the same) and the pyrite sericite cataclasite. This research proves that numerical simulation methods is effective in mineral exploration, especially for those areas with insufficient data to use data-driven prospectivity modeling approaches. Future development into both mathematical geosciences and computational science will provide more detailed answers for remaining hot issues related to mineral exploration.

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基于数值模拟的中国山东半岛东部红埠变质岩型金矿床金矿化靶区定位研究
变质岩型矿床是重要的金矿床,广泛分布于世界各地,具有重要的经济和工业价值。山东半岛东部是世界第三大金矿区,已知黄金储量超过 5300 吨。这里的金矿床主要分布在胶东西北部(莱州-招远)、栖霞-蓬莱-福山和牟平-鲁山三大矿区。红埠矿床是胶东西北部矿田中的一个中型蚀变岩型矿床。经过几十年的开采,洪埠矿床面临着资源枯竭和未数字化数据丢失的困境。因此,探矿和勘探必须将重点放在已知金矿化的深部和外围地区。本研究建立了红埠矿床的三维模型,并对其进行切片,获得了九个断面,进行了多场耦合数值模拟(包括热传导、流体迁移、化学反应和物质迁移)。将金矿化相对发育的地点(金浓度范围内前 15%)定义为具有成矿潜力的地点,并将其突出显示和投影到红埠区地质图上。研究结果还表明,这九个剖面内的金矿化空间分布不同,表明金矿化的形成受河西断层形态(这九个剖面的其他模拟参数相同)和黄铁矿绢云母化的控制。这项研究证明了数值模拟方法在矿产勘探中的有效性,特别是对于那些数据不足,无法使用数据驱动的找矿建模方法的地区。数学地球科学和计算科学的未来发展将为矿产勘探相关的其余热点问题提供更详细的答案。
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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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