TY - JOUR
T1 - Boron isotope variations in geothermal systems on Java, Indonesia
AU - Purnomo, Budi Joko
AU - Pichler, Thomas
AU - You, Chen Feng
N1 - Funding Information:
A part of this study was funded by the Ministry of Energy and Mineral Resources of Indonesia through PhD scholarship grants number: 2579 K/69/MEM/2010 for B.J. Purnomo. Thanks to Prof. Leeman, W.P. for the fruitful input and suggestion, to PT GEODIPA Dieng for the access to the geothermal brines, to Laura Knigge for the laboratory assistance and to Britta Hinz-Stolle for an editorial review. We also thank to two anonymous reviewers for the useful comments and suggestions.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - This paper presents δ11B data for hot springs, hot acid crater lakes, geothermal brines and a steam vent from Java, Indonesia. The processes that produce a large range of the δ11B values were investigated, including the possible input of seawater as well as the contrast δ11B compositions of acid sulfate and acid chloride crater lakes. The δ11B values of hot springs ranged from -2.4 to +28.7‰ and acid crater lakes ranged from +0.6 to +34.9‰. The δ11B and Cl/B values in waters from the Parangtritis and Krakal geothermal systems confirmed seawater input. The δ11B values of acid sulfate crater lakes ranged from +5.5 to +34.9‰ and were higher than the δ11B of +0.6‰ of the acid chloride crater lake. The heavier δ11B in the acid sulfate crater lakes was caused by a combination of vapor phase addition and further enrichment due to evaporation and B adsorption onto clay minerals. In contrast, the light δ11B of the acid chloride crater lake was a result of acid water-rocks interaction. The correlations of δ11B composition with δ18O and δ2H indicated that the B isotope corresponded to their groundwater mixing sources, but not for J21 (Segaran) and J48 (Cikundul) that underwent 11B isotope enrichment by B adsorption into minerals.
AB - This paper presents δ11B data for hot springs, hot acid crater lakes, geothermal brines and a steam vent from Java, Indonesia. The processes that produce a large range of the δ11B values were investigated, including the possible input of seawater as well as the contrast δ11B compositions of acid sulfate and acid chloride crater lakes. The δ11B values of hot springs ranged from -2.4 to +28.7‰ and acid crater lakes ranged from +0.6 to +34.9‰. The δ11B and Cl/B values in waters from the Parangtritis and Krakal geothermal systems confirmed seawater input. The δ11B values of acid sulfate crater lakes ranged from +5.5 to +34.9‰ and were higher than the δ11B of +0.6‰ of the acid chloride crater lake. The heavier δ11B in the acid sulfate crater lakes was caused by a combination of vapor phase addition and further enrichment due to evaporation and B adsorption onto clay minerals. In contrast, the light δ11B of the acid chloride crater lake was a result of acid water-rocks interaction. The correlations of δ11B composition with δ18O and δ2H indicated that the B isotope corresponded to their groundwater mixing sources, but not for J21 (Segaran) and J48 (Cikundul) that underwent 11B isotope enrichment by B adsorption into minerals.
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U2 - 10.1016/j.jvolgeores.2015.12.014
DO - 10.1016/j.jvolgeores.2015.12.014
M3 - Article
AN - SCOPUS:84955113128
VL - 311
SP - 1
EP - 8
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
SN - 0377-0273
ER -