Journal Title
Title of Journal: Hydrogeol J
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Abbravation: Hydrogeology Journal
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Publisher
Springer-Verlag
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Authors: Franziska Steinbruch Broder J Merkel
Publish Date: 2008/07/29
Volume: 16, Issue: 8, Pages: 1655-1668
Abstract
A hydrogeological study was conducted with the objective to investigate the only currently known hot spring of Sofala Province in Mozambique with respect to the origin of the water the discharge and its chemical composition Field investigations comprised a general land use survey mapping of sediment and water temperatures discharge measurements and onsite water chemistry as well as sampling for further chemical analyses and groundwater dating Thermal water discharge occurs along a 100 m long NE–SW zone with water temperatures ranging from 42 to 645°C The thermal water is a lowmineralized sodiumchloridesulfate water enriched in phosphate fluorine and nickel The silica geothermometer the silica concentration of 43 mg/kg and the ratios of Br/Cl and I/Cl of 25 × 10–3 suggest that the thermal water stems from approximately 5000 m depth and had a long residence time with silicate rocks This points towards Gorongosa Mountain as the water source area 14C dating suggests a groundwater age of 11000 yearsUne étude hydrogéologique a été réalisée avec pour objectif d’examiner la seule source chaude connue actuellement de la Province Sofala au Mozambique en ce qui concerne l’origine de l’eau le débit et sa composition chimique Les recherches de terrain ont consisté en un inventaire général de l’utilisation du sol la cartographie des températures des sédiments et de l’eau des mesures de débit et de la chimie de l’eau sur le terrain de même que l’échantillonnage pour des analyses chimiques et des datations de l’eau souterraine ultérieures L’écoulement d’eau thermale a lieu le long d’une zone NESW de 100 m de long avec des températures de l’eau allant de 42 à 645 °C L’eau thermale est une eau chlorosulfatosodique à minéralisation faible enrichie en phosphate fluor et nickel Le géothermomètre à silice la concentration en slice de 43 mg/kg et les rapports Br/Cl et I/Cl de 25 x 10−3 suggèrent que l’eau thermale provient d’une profondeur d’environ 5000 m et a eu un long temps de résidence dans des roches silicatées Ceci désigne la Gorongosa Mountain comme la région d’origine de l’eau La datation au 14C suggère un âge de 11000 ans pour l’eau souterraineSe ha llevado a cabo un estudio hidrogeológico del único manantial conocido de aguas calientes en la Provincia de Sofala Mozambique para investigar el origen del agua su descarga y su composición química Las investigaciones de campo comprendieron una descripción de los usos de la tierra un mapeo de los sedimentos y la temperatura del agua medición de descargas y datos de la química del agua determinados en el sitio así como la obtención de muestras para posteriores análisis químicos y datación de las aguas subterráneas Las descargas de agua termal se manifiestan a lo largo de una zona de 100 m con dirección NESO con temperaturas que varían de 42 a 645 °C Las aguas termales son de baja mineralización con predominio de sodio cloruro y sulfato y enriquecidas en fosfato flúor y níquel El geotermómetro de sílice la concentración de sílice de 43 mg/kg y las relaciones de Br/Cl y I/Cl de 25 x 10−3 sugieren que las aguas termales se originan a una profundidad de aproximadamente 5000 m y muestran largos tiempos de residencia en contacto con rocas silicatadas Esta evidencia señala que las Montañas Gorongosa son la fuente de las aguas La datación con 14C sugiere una edad de 11000 años para las aguas subterráneas为调查莫桑比克Sofala省迄今已知的唯一温泉 开展了与泉水的起源、排泄及其化学成分相关的水文地质研究。野外调查包括常规的土地利用调查、沉积物和水温填图、流量测量、现场水化学分析和其他水化学分析取样及地下水定年。热水排泄带沿NE–SW走向 长100米 水温42到645℃。热水为NaClSO4型低矿化度水 富含磷、氟和镍。硅温标、硅浓度 43 mg/kg 及Br/Cl 和I/Cl比 25x103 表明热水赋存于约5000米深度的硅酸岩中 且驻留时间较长。由此推断其补给区为Gorongosa山区。地下水C14年龄为11000年。Um estudo hidrogeológico foi efectuado com o objectivo de investigar a única nascente de águas quentes conhecida na Província de Sofala em Moçambique do ponto de vista da origem da água do fluxo de descarga e da sua composição química As investigações de campo compreenderam trabalhos de pesquisa no terreno mapeamento das temperaturas dos sedimentos e da água subterrânea e medições hidroquímicas in situ bem como a recolha de amostras para posteriores análises químicas e datação A descarga de águas termais ocorre ao longo de um alinhamento NESW com 100 m de comprimento e a temperatura das águas varia entre os 42 e os 645 °C As águas apresentam uma mineralização baixa em sódio cloreto e sulfato e enriquecida em fosfato flúor e níquel No geotermómetro de sílica a concentração de sílica de 43 mg/kg e as relações Br/Cl e I/Cl de 25 x 10−3 sugerem que as águas termais provêem de aproximadamente 5000 m de profundidade e têm uma um longo tempo de residência em rochas silicatadas Este facto aponta para a Serra da Gorongosa como a zona de infiltração A datação com base no 14C sugere uma idade de 11000 anos para esta água subterrânea
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