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The Volatiles of Mt. Pagan, Northern Mariana Islands

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Title:The Volatiles of Mt. Pagan, Northern Mariana Islands
Authors:Evans, William C.
Presser, T.S.
White, lloyd D.
Barnes, Ivan
Date Issued:1987
Publisher:University of Hawaii Press
Citation:Evans WC, Presser TS, White LD, Barnes I. 1987. The volatiles of Mt. Pagan, Northern Mariana Islands. Pac Sci 41: 90-103.
Abstract:The powerful 15 May 198I eruption and frequent subsequent
activity of Mt.Pagan have led to the formation of an extensive summit fumarole
field. An exhaustive search using a portable gas "sniffer" failed to detect a
significant primary magmatic gas component in the fumarole field. Collected
gas samples contain mostly ambient air with concentrations of CO2 to a maximum
of 5.5% of the dry gas. He, H2, H2S, S02 , and CH4 are below detection
limits in all samples collected. The (H20)/(C02) ratio was 13 for one fumarole
tested. The carbon isotope composition of the fumarolic CO2 (b13C-C02 =
-1.1) shows that this gas is derived from marine carbonates. The physical
location of these carbonates has not been determined. The hydrogen isotope
compositions of the fumarolic water (D-H20 = -29 to -48) and low concentrations
of HCl (approximately 500 mg/L) indicate that the fumarolic condensates
are produced mostly from locally derived meteoric water. Seawater is
apparently excluded from the central volcanic body. The lack of detectable
primary magmatic volatiles in fumarolic emanations may reflect prior degassing
of the mantle beneath Mt.Pagan.
Appears in Collections: Pacific Science Volume 41, Numbers 1-4, 1987

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