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Hydrochemistry and H-O-C-S Isotopic Geochemistry Characteristics of Geothermal Water in Nyemo-Nagqu,Tibet

Acta Geologica Sinica(English Edition) 2017年第2期91卷 644-657页

作者： WANG Siqi LIU Zhao SHAO Jingli School of Water Resources and Environment China University of GeosciencesBeijing 100083China School of Water Resources&Environment Hebei GEO UniversityShijiazhuang 050031China Hebei Province Key Laboratory of Sustained Utilization&Development of Water Resources Shijiazhuang 050031China

Nyemo-Nagqu, Tibet, is rich in high-temperature geothermal resources. The geothermal fields in Yangbajain and Yangyi as well as 11 unexplored geothermal fields along the geothermal belt from Nyemo to Nagqu were systematically investigated and the hydrochemistry data were collected from the whole field. Meanwhile, H-O-C-S isotope data were obtained for the new fields, and H-O isotope data for the Yangbajain and Yangyi fields. A comparison of the Nyemo-Nagqu geothermal fields with those in the Yangbajain area shows that the types of high-temperature geothermal water are dominated by Cl-Na and Cl·HCO3-Na, while the types of medium-high-temperature geothermal water are dominated by HCO3-Na. The concentrations of Li, F, SiO2, and HBO2 in the geothermal water are positively correlated with Cl content, indicating possible mixing with magma water. The reservoir temperatures range from 90 to 270°C by geothermometers. Slight drifting of 18O was recorded at the Dongweng and Nyingzhong high-temperature geothermal fields, while more significant drifting was recorded at Gulu. The geothermal water is mainly replenished by atmospheric precipitation. The low tritium contents（〈1 TU） of the geothermal water from Nyingzhong, Gulu, and Luoma indicate that it is mainly replenished by sub-modern（prior to 1952） water, while the high tritium content（8.4 TU） in Yuela implies modern water replenishment. Other geothermal fields are replenished by a mix of sub-modern fresher water. The isotopic data in this study show that the carbon and sulfur in the geothermal water originates mainly from sediment leaching, with some of the carbon and sulfur having a deep origin.

关键词： geothermal water hydrochemical characteristics isotope data Tibet Proto-Tethys

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The Muruntau gold deposit(Uzbekistan)--A unique ancient hydrothermal system in the southern Tien Shan

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Geoscience Frontiers 2016年第3期7卷 495-528页

作者： Ulf Kempe Torsten Graupner Reimar Seltmann Hugo de Boorder Alla Dolgopolova Maarten Zeylmans van Emmichoven Institut fur Mineralogie TU Bergakademie Freiberg Brennhausgasse 14 09596 Freiberg Germany Federal Institute for Geosciences and Natural Resources (BGR) Stilleweg 2 30655 Hannover Germany Centre for Russian and Central EurAsian Mineral Studies (CERCAMS) Department of Earth Sciences Natural History Museum Cromwell Road London SW7 5BD UK Faculty of Geosciences Utrecht University Heidelberglaan 2 3584 CS Utrecht The Netherlands

The Muruntau gold deposit in the Central Kyzylkum,Uzbekistan is one of the largest single gold deposits worldwide.data available from the literature are reviewed with the aim to（1） integrate the present knowledge on this unique deposit from Russian and English literature;（2） show the considerable progress made in the understanding of the genesis of the Muruntau deposit during the last decades;and（3） point to problems still open for future research.Deposit formation occurred through a multi-stage process involving sedimentation,regional metamorphism including thrusting,magmatism with formation of hornfels aureoles and several stages of hydrothermal activity.According to recent knowledge,synsedimentary or pure metamorphic formation of gold mineralization seems unlikely.The role of granite magmatism occurring roughly within the same time interval as the main hydrothermal gold precipitation remains uncertain.There are no signs of interaction of matter between the magma（s） and the hydrothermal system（s）.On the other hand,there was an intense,high-temperature（above 400 ℃）fluid- wall rock interaction resulting in the formation of gold-bearing,cone-like stockworks with veins,veinlets and gold-bearing metasomatites.Several chemical and isotope indicators hint at an involvement of lower-crustal or mantle-related sources as well as of surface waters in ore formation.Deposit formation through brecciation involving explosion,hydrothermal or tectonic breccias might explain these data.Further investigations on breccia formation as well as on the exact timing of relevant sedimentary,metamorphic,magmatic and hydrothermal events are recommended.

关键词： Muruntau Gold deposit Fluid inclusions isotope data Gold composition

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