Degassing of CO2 and H2O in submarine lavas from the Society hotspot | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Degassing of CO2 and H2O in submarine lavas from the Society hotspot

Type de publication:

Journal Article

Source:

Earth and Planetary Science Letters, Volume 235, Ticket 3-4, p.511-527 (2005)

ISBN:

0012-821X

Numéro d'accès:

ISI:000230609400004

URL:

http://www.sciencedirect.com

Mots-clés:

DISSOLVED CARBON; FRENCH-POLYNESIA; ALKALIC BASALTS

Résumé:

We analyzed CO2-delta(13)C-(HO)-O-2-delta D in vesicles of a suite of 23 vesicular submarine volcanic glasses (4 alkalic basalts and 19 trachytes) from Teahitia, Volcano 4 and Rocard seamounts and Mehetia Island in the active area of the Society hotspot (French Polynesia, South Pacific). Vesicle C and H2O concentrations ([C-vesicle] and [H2Ovesicle) vary in the range 1-1487 ppm C and similar to 0-5431 ppm H2O, respectively. The delta(13)C of CO2 in vesicles (delta(13)C(vesicle)) vary from -3.8 parts per thousand to -9.7 parts per thousand and the delta D of H2O in vesicles (delta D-vesicle) vary from -32 parts per thousand to -71 parts per thousand. The delta(13)C(vesicles) values are correlated with the vesicularity, Log([C-vesicle]) and the delta D-vesicle values. The Log([H2Ovesicle) is also correlated to the delta D-vesicle values and Log([C-vesicle). These observations show that late-stage open-system degassing, following a first stage of closed-system degassing, is the chief process controlling the concentration and isotopic ratio variations observed in the vesicles. The highest measured delta(13)C(vesicle) values fall in a typical mantle range (-4.0 +/- 0.5 parts per thousand). Taking into account the effect of vesicle bursting and crystal fractionation, the reconstructed pre-eruptive carbon and water concentrations in the alkalic basalt parental magma are similar to 3810 ppm C and 14,360 ppm H2O (1.43 wt.%). These concentrations correspond to carbon and water fluxes for the Society hotspot during the last 900 kyr of 2.57 x 10(4) tons C yr(-1) and 97 x 10(3) tons H2O yr(-1) and volatile concentrations of the source of 190 ppm C and 720 ppm H2O. These values are similar in magnitude to previous estimates for other hotspots. Our study emphasizes that H2O degassing must be taken into account before discussing H2O content and delta D value variations in the lavas in terms of source variation in the case of the Society hotspot. (c) 2005 Elsevier B.V. All rights reserved.

Notes:

Earth Planet. Sci. Lett.ISI Document Delivery No.: 946YOTimes Cited: 3Cited Reference Count: 83Cited References:ALT JC, 1993, EARTH PLANET SC LETT, V119, P477AUBAUD C, 2004, EARTH PLANET SC LETT, V222, P391AUBAUD C, 2004, GEOPHYS RES LETT, V31BINARD N, 1992, J GEOPHYS RES-SOLID, V97, P13999BINARD N, 2004, OCEANIC HOTSPOTS INT, P157BLANK JG, 1994, REV MINERAL, V30, P157BUREAU H, 1998, CHEM GEOL, V147, P115BUREAU H, 1999, GEOPHYS RES LETT, V26, P3501BURNARD PG, 2002, EARTH PLANET SC LETT, V203, P131BYERS CD, 1985, GEOCHIM COSMOCHIM AC, V49, P1887CARTIGNY P, 2001, EARTH PLANET SC LETT, V194, P241CHEMINEE JL, 1989, MAR GEOPHYS RES, V11, P27CRISP JA, 1984, J VOLCANOL GEOTH RES, V20, P177DELANEY JR, 1978, GEOCHIM COSMOCHIM AC, V42, P581DESMARAIS DJ, 1984, EARTH PLANET SC LETT, V69, P43DEVEY CW, 1990, J GEOPHYS RES, V95, P5049DEVEY CW, 2003, GEOLOGY, V31, P395DIXON JE, 1988, EARTH PLANET SC LETT, V90, P87DIXON JE, 1991, J GEOL, V99, P371DIXON JE, 1995, J PETROL, V36, P1607DIXON JE, 1997, AM MINERAL, V82, P368DIXON JE, 1997, J PETROL, V38, P911DIXON JE, 2001, J PETROL, V42, P627DUNCAN RA, 1976, J VOLCANOL GEOTH RES, V1, P197GERLACH TM, 1990, GEOCHIM COSMOCHIM AC, V54, P2051HAMILTON DL, 1964, J PETROL, V5, P21HEKINIAN R, 1973, NATURE, V245, P371HEKINIAN R, 1991, J GEOPHYS RES-SOLID, V96, P2109HEKINIAN R, 2003, J VOLCANOL GEOTH RES, V121, P219HEMOND C, 1994, CHEM GEOL, V115, P7HILTON DR, 2000, EARTH PLANET SC LETT, V183, P43HOFMANN AW, 1997, NATURE, V385, P219HOLLOWAY JR, 1994, REV MINERAL, V30, P187JAMBON A, 1990, EARTH PLANET SC LETT, V101, P323JAVOY M, 1978, CONTRIB MINERAL PETR, V67, P35JAVOY M, 1982, NATURE, V300, P171JAVOY M, 1991, EARTH PLANET SC LETT, V107, P598JENDRZEJEWSKI N, 1994, THESIS PARIS, V7JENDRZEJEWSKI N, 1997, CHEM GEOL, V138, P81KEPPLER H, 2003, NATURE, V424, P414KINZLER RJ, 1992, J GEOPHYS RES-SOL EA, V97, P6907MACPHERSON C, 1994, EARTH PLANET SC LETT, V121, P263MARTY B, 1987, EARTH PLANET SC LETT, V83, P16MARTY B, 1998, CHEM GEOL, V145, P233MARTY B, 1999, GEOCHIM COSMOCHIM AC, V63, P3619MARTY B, 2001, J VOLCANOL GEOTH RES, V108, P1MATTEO VD, 2004, CHEM GEOL, V213, P187MATTEY DP, 1989, GEOCHIM COSMOCHIM AC, V53, P2377MATTEY DP, 1990, CONTRIB MINERAL PETR, V104, P492MATTEY DP, 1991, GEOCHIM COSMOCHIM AC, V55, P3467MICHAEL PJ, 1988, GEOCHIM COSMOCHIM AC, V52, P555MICHARD A, 1993, GEOCHIM COSMOCHIM AC, V57, P4977MOORE JG, 1970, CONTRIB MINERAL PETR, V28, P272MOORE JG, 1977, J VOLCANOL GEOTH RES, V2, P309MOREIRA M, 2000, EARTH PLANET SC LETT, V176, P375NEWMAN S, 1988, J VOLCANOL GEOTHERM, V35, P75NEWMAN S, 2002, COMPUT GEOSCI-UK, V28, P597NISHIO Y, 1998, EARTH PLANET SC LETT, V154, P127NISHIO Y, 1999, EARTH PLANET SC LETT, V170, P241NOWAK M, 1995, GEOCHIM COSMOCHIM AC, V59, P3445PAN V, 1991, GEOCHIM COSMOCHIM AC, V55, P1587PAWLEY AR, 1992, EARTH PLANET SC LETT, V110, P213PINEAU F, 1976, EARTH PLANET SC LETT, V29, P413PINEAU F, 1983, EARTH PLANET SC LETT, V62, P239PINEAU F, 1994, EARTH PLANET SC LETT, V123, P179PINEAU F, 1998, CHEM GEOL, V147, P173PINEAU F, 2004, CHEM GEOL, V211, P159ROEDER PL, 1970, CONTRIB MINERAL PETR, V29, P275RYAN MP, 1981, J GEOPHYS RES, V86, P9519SHAW AM, 2004, GEOCHIM COSMOCHIM AC, V68, P1837SHEN A, 1995, AM MINERAL, V80, P1335SIMONS K, 2002, GEOCHEM GEOPHYS GEOS, V3STAUDACHER T, 1989, EARTH PLANET SC LETT, V93, P210STOLPER E, 1988, EARTH PLANET SC LETT, V87, P397STOLPER E, 1994, EARTH PLANET SC LETT, V121, P293TALANDIER J, 1984, J GEOPHYS RES, V89, P11216TAYLOR BE, 1983, NATURE, V306, P541TRULL T, 1992, AGU REFERENCE SHELF, V73, P348WALLACE PJ, 1998, GEOPHYS RES LETT, V25, P3639WHITTINGTON A, 2001, CHEM GEOL, V174, P209WHITTINGTON A, 2004, CHEM GEOL, V211, P391WOOD BJ, 1996, PHILOS T ROY SOC A, V354, P1495ZINDLER A, 1986, ANNU REV EARTH PL SC, V14, P493