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Obliteration of thermal springs by groundwater flows in sedimentary basins of Brazil

机译：巴西沉积盆地中的地下水流掩盖了温泉

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摘要

Analysis of geothermal and hydrogeologic characteristics of Paleozoic interior basins of Brazil has identified an association between the geographic distribution of thermal springs and areas of occurrences of groundwater flow. Specifically, thermal springs are found to be absent in regions inferred to have lateral flows of groundwater. This trend is evident in the basins of the Amazon region, in the central parts of the Parnaíba basin and in the west-central parts of the Paraná basin. Model studies help to elucidate mutual exclusion of regions of thermal springs and subhorizontal flows of groundwater. Numerical simulations indicate that groundwater flows with velocities ≥ 1cm/ year are capable of masking the occurrence of thermal anomalies. Also, down flow through distributed recharge zones can lead to development of large zones of relatively low temperature. The observational data sets of temperature gradients and Peclet numbers have been employed outlining advection-convection domains of subsurface strata in the sedimentary basins of the Amazon region, Parnaíba and Paraná. Results obtained indicate that thermal buoyancy forces are incapable of overcoming advective flows in basins of the Amazon region. Similar conditions are also found to prevail in the central parts of the Parnaíba and Paraná basins.
机译：对巴西古生代内部盆地的地热和水文地质特征的分析已经确定了温泉的地理分布与地下水流发生区域之间的关联。具体地，发现在推断为具有地下水侧向流动的区域中不存在温泉。这种趋势在亚马逊地区的盆地，帕纳伊巴盆地的中部和巴拉那州盆地的中西部很明显。模型研究有助于阐明温泉区域和地下水水平下流动的相互排斥。数值模拟表明，流速≥1cm /年的地下水能够掩盖热异常的发生。同样，通过分布式补给区的向下流动会导致形成温度相对较低的大区。已采用温度梯度和派克雷特数的观测数据集概述了亚马逊地区，帕尔纳伊巴州和巴拉那州沉积盆地的地下地层的对流-对流域。获得的结果表明，热浮力无法克服亚马逊地区盆地中的对流。在帕纳伊巴盆地和巴拉那盆地的中部地区也发现了类似的情况。

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