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REEs associated with carbonatite-alkaline complexes in western Rajasthan, India: exploration targeting at regional-scale
Solid Earth ( IF 3.4 ) Pub Date : 2021-09-24 , DOI: 10.5194/se-2021-108
Malcolm Aranha , Alok Porwal , Manikandan Sundaralingam , Ignacio González-Álvarez , Amber Markan , Karunakar Rao

Abstract. A two-stage fuzzy inference system (FIS) is applied to prospectivity modelling and exploration-target delineation for REE deposits associated with carbonatite-alkaline complexes in western part of the state of Rajasthan in India. The design of the FIS and selection of the input predictor map are guided by a generalised conceptual model of carbonatite-alkaline-complexes-related REE mineral systems. In the first stage, three FISs are constructed to map the fertility and favourable geodynamic settings, favourable lithospheric architecture, and favourable shallow crustal (near-surface) architecture, respectively, for REE deposits in the study area. In the second stage, the outputs of the above FISs are integrated to map the prospectivity of REE deposits in the study area. Stochastic and systemic uncertainties in the output prospectivity maps are estimated to facilitate decision making regarding the selection of exploration targets. The study led to identification of prospective targets in the Kamthai-Sarnu-Dandeli and Mundwara regions, where project-scale detailed ground exploration is recommended. Low-confidence targets were identified in the south of the Siwana ring complex, north and northeast of Sarnu-Dandeli, south of Barmer, and south of Mundwara. Detailed geochemical sampling and high-resolution magnetic and radiometric surveys are recommended in these areas to increase the level of confidence in the prospectivity of these targets before undertaking project-scale ground exploration. The prospectivity-analysis workflow presented in this paper can be applied to delineation of exploration targets in geodynamically similar regions globally such as Afar province (East Africa), Paraná-Etendeka (South America and Africa), Siberian (Russia), East European Craton-Kola (Eastern Europe), Central Iapetus (North America, Greenland and the Baltic region), and the Pan-superior province (North America).

中文翻译:

与印度拉贾斯坦邦西部碳酸岩-碱性复合体相关的稀土元素:以区域为目标的勘探

摘要。将两阶段模糊推理系统 (FIS) 应用于印度拉贾斯坦邦西部与碳酸岩-碱性复合体相关的稀土矿床的远景建模和勘探目标圈定。FIS 的设计和输入预测器图的选择以碳酸岩-碱性复合物相关 REE 矿物系统的广义概念模型为指导。在第一阶段,构建三个 FIS 分别绘制研究区稀土矿床的肥力和有利的地球动力学环境、有利的岩石圈结构和有利的浅地壳(近地表)结构。第二阶段,综合上述 FIS 的输出,绘制研究区稀土矿床的远景图。估计输出前景图中的随机和系统不确定性,以促进有关勘探目标选择的决策。该研究导致在 Kamthai-Sarnu-Dandeli 和 Mundwara 地区确定了潜在目标,建议在这些地区进行项目规模的详细地面勘探。在 Siwana 环形复合体南部、Sarnu-Dandeli 北部和东北部、Barmer 南部和 Mundwara 南部发现了低置信度目标。建议在这些地区进行详细的地球化学采样和高分辨率磁和辐射测量,以在进行项目规模的地面勘探之前提高对这些目标前景的置信度。
更新日期:2021-09-24
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