Please use this identifier to cite or link to this item: http://repository.vnu.edu.vn/handle/VNU_123/27066
Title: Water geochemistry and soil gas survey at Ungaran geothermalfield, central Java, Indonesia
Authors: Nguyen Kim Phuong
Agung Harijoko
Ryuichi Itoi
Yamashiro Unoki
Keywords: Soil gas;Water geochemistry;Ungaran geothermalfield;Indonesia
Issue Date: 2012
Publisher: ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation: ISIKNOWLEDGE
Abstract: A soil gas survey for radon (Rn), thoron (Tn), CO2, and mercury (Hg), and the chemical analysis of hot spring waters, were undertaken in the Ungaran geothermalfield, Central Java, Indonesia. The results of soil gas surveys indicate fault systems trendingNNE–SSWandWNW–ESE. ParticularlyhighCO2concentrations (>20%), andhigh Hg concentrations were detected in vicinity of the fumaroles. Emanometries of Rn, Tn and CO2also conclusively identified the presence of a fracture zone for the migration of geothermalfluid. The Hg results infer that the up-flow zone of high temperature geothermalfluids maybe located in the north of fumaroles in the Gedongsongo area (near the collapse wall). Chemistry of thermal springs in the up-flow zone are acid (pH=4) and show a Ca–Mg–SO4composition. The thermal waters are mainly Ca–Mg–HCO3and Ca–(Na)–SO4–HCO3types near the fumarolic area and are mixed Na–(Ca)–Cl–(HCO3) waters in the south east of Gedongsongo. Theδ 18 O (between −5.3 and−8.2‰)andδ(between−39 and−52‰) indicate that thewaters are essentially meteoric inorigin. A conceptual hydro-geochemical model of the Gedongsongo thermal waters based on the soil gas, isotope and chemical analytical results, was constructed
Description: TNS06871 ; JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH Volume: 229 Pages: 23-33 Published: JUN 1 2012
URI: http://repository.vnu.edu.vn/handle/VNU_123/27066
http://www.sciencedirect.com/science/article/pii/S0377027312000844
ISSN: 0377-0273
1872-6097
Appears in Collections:Bài báo của ĐHQGHN trong Web of Science

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