Geophysical analysis of Catalão I alkaline–carbonatite complex in Goiás, Brazil
Geophysical analysis of Catalão I alkaline–carbonatite complex in Goiás, Brazil
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DOI：
10.1111/1365-2478.12283
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发表时间：
2016-01
影响因子：
2.6
通讯作者：
M. Mantovani;V. Louro;V. B. Ribeiro;H. Requejo;R. P. Z. D. Santos
中科院分区：
文献类型：
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作者：
M. Mantovani;V. Louro;V. B. Ribeiro;H. Requejo;R. P. Z. D. Santos
位于巴西中部的Catalao i碱性碳酸盐杂岩是世界上主要的Nb和磷酸盐生产商之一。由于其经济潜力，人们在地质学和地球化学学上进行了深入的研究。这项工作提供了对这一综合体的地球物理分析，确定了它在地下和尚未勘探的部分的行为。应用了不同的地球物理方法和技术，以获得尽可能可靠的结果：在地表，通过辐射、地质和地形数据，在深层，通过地质、磁力和重力数据。通过重力和磁场数据的反演成功地完成了分析，这些数据在体积和形状上都产生了非常相似的模型。它们的密度和磁化率对比与原始镁铁质侵入体预期的纯橄榄岩-辉石岩岩性一致，并(通过排除)指示了碳酸盐体的体积，这与已知的磷酸盐和Nb含量一起，可以间接估计杂岩的储量和资源量。
The Catalão I alkaline–carbonatite complex, which is located in Central Brazil, is one of the main producers of niobium and phosphates in the world. It has been intensely studied geologically and geochemically for its economic potential. This work presents a geophysical analysis over this complex, identifying its behaviour in the subsurface and in portions that have not been explored yet. Different geophysical methods and techniques were applied to achieve the most reliable results possible: at the surface, through radiometric, geological, and topographic data, and at depth, by geological, magnetic, and gravimetric data. The analysis was successfully completed with inversions of gravity and magnetic data that resulted in quite similar models, both in volume and shape. Their density and magnetic susceptibility contrasts were consistent with the expected dunite–pyroxenite lithology from the original mafic intrusion and indicated (by exclusion) the volume of the carbonatite body, which along with the known contents of phosphates and niobium allowed an indirect estimate of the reserves and resources of the complex.