Geochemistry, isotopic composition, and origin of fluids emanating from mud volcanoes in the Copper River basin, Alaska

Details Geochemistry, isotopic composition, and origin of fluids emanating from mud volcanoes in the Copper River basin, Alaska Geochemistry, isotopic composition, and origin of fluids emanating from mud volcanoes in the Copper River basin, Alaska

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53...29m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 1, pp.29-41

Computer Science

6

Scientific paper

Analyses of waters and gases from the Copper River basin, Alaska, show marked differences in the fluid chemistries of two groups of mud-volcano saline springs. The Tolsona group discharges Na-Ca rich, HCO 3 - SO 4 poor saline waters accompanied by small amounts of CH 4 , N 2 , and He. Tolsona gases have 3 He / 4 He ratios of 0.75 to 2.7 ( R / R atm ), 13 C-CH 4 values of - 33 to - 22 per mil, and 15 N values of - 1.8 to + 1.6 per mil. The Klawasi group discharges Ca poor, Na-HCO 3 rich saline waters with large amounts of CO 2 and 3 He / 4 He ratios of 2.6 to 4.1 ( R / R atm ), 13 C---CO 2 values of - 4.8 to - 3.1 per mil, 13 C---CH 4 values of - 23 to - 18 per mil, and 15 N of - 3.5. Spring waters from both groups differ substantially from seawater composition. Compared to the Tolsona waters, the Klawasi waters are strongly enriched in Li, Na, K, Mg, HCO 3 , SO 4 , B, SiO 2 , As and 18 O and strongly depleted in Ca, Sr and deuterium. The differences in fluid chemistry are attributed to the interaction of CO 2 with Tolsona-type formation waters. The CO 2 is thought to be derived from a deep-seated magmatic intrusive and contact decarbonation of limestone beds underlying the Klawasi area.

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