The origin of hypersaline liquid in the quaternary kakkonda granite, sampled from well WD-1a, kakkonda geothermal system, Japan

✍ Scribed by Kaichiro Kasai; Yukihiro Sakagawa; Ryo Komatsu; Munetake Sasaki; Kohei Akaku; Toshihiro Uchida

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 448 KB
• Volume: 27
• Category: Article
• ISSN: 0375-6505
• DOI: 10.1016/s0375-6505(98)00037-6

✦ Synopsis

Hypersaline metal!rich liquid "ca[ 39 wt) total chloride species# was obtained from a depth of 2697 m in the Kakkonda geothermal system[ Sampling of well WD!0a was conducted by reverse circulation after a standing time of about 085 hours "with temperature recovering to ×499>C#[ Tritium content and the relationship between dD and d 07 O showed that the river water that was circulated in the well had mixed with an isotopically heavy ~uid during the standing time[ Phase separation occurred during temperature recovery\ con! centrating the hypersaline liquid in the bottom of the well[ This original hyp! ersaline liquid has a salinity of about 44 wt) NaCl eq[\ consisting of NaÐFeÐ KÐMnÐCa chloride\ rich in Zn and Pb but poor in Cu\ Au and Ag[ The ~uid originates from the Kakkonda granite and mixed with circulating water from the well in a zone of _ne fractures induced by thermal stress during drilling[ Þ 0887 CNR[ Published by Elsevier Science Ltd[ All ri`hts reserved Key words] geochemistry\ isotope\ salinity\ ~uid inclusion\ PTX analysis\ geo! thermal model\ Kakkonda\ Japan[