Rapid change of lava composition from 1998 to 2002 at Piton de la Fournaise (Reunion) inferred from Pb isotopes and trace elements: Evidence for variable crustal contamination | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Rapid change of lava composition from 1998 to 2002 at Piton de la Fournaise (Reunion) inferred from Pb isotopes and trace elements: Evidence for variable crustal contamination

Type de publication:

Journal Article

Source:

Journal of Petrology, Volume 46, Ticket 1, p.79-107 (2005)

ISBN:

0022-3530

URL:

http://www.oxfordjournals.org/

Mots-clés:

SOURCE; HAWAII

Résumé:

After an unusually long quiet period of nearly 6 years, in 1998 the Piton de la Fournaise volcano started a new cycle of intense volcanic activity. We report geochemical data on the first nine events (53 samples), from the long-lived initial eruption (six and a half months) of 1998 to the high-flux picritic eruption of January 2002. Pb isotopes and trace elements display systematic, coupled variations, which are mostly confined to the beginning and the end of the period. Two well-defined binary mixing trends are shown by Pb-Pb and Pb-trace element relationships. These trends indicate a change of end-member components between March and June 2001 that coincides with the transition from steady-state basalts to picrites. A three-component mixing model involving a homogeneous plume and two contaminants successfully explains the data. The Pb-Pb relationship requires that two mixing processes occur successively: plume-derived magma interacts first with altered oceanic crust, and the resulting hybrid product then interacts at shallower level with the old lavas constituting the base of the volcanic edifice. Assimilation of edifice material decreased continuously from 1998 to 2002, whereas assimilation of oceanic crust drastically increased during the late-stage picritic eruption. These results suggest that picrites may have resided for an unusually long time at an oceanic crustal level before ascending rapidly through the volcanic edifice with little interaction with channel walls.

Notes:

J. Petrol.ISI Document Delivery No.: 886ALTimes Cited: 6Cited Reference Count: 67Cited References:AKI K, 2000, J GEOPHYS RES-SOL EA, V105, P16617ALBAREDE F, 1988, J PETROL, V29, P997ALBAREDE F, 1993, GEOCHIM COSMOCHIM AC, V57, P615ALBAREDE F, 1997, J PETROL, V38, P171ALLEGRE CJ, 1986, CHEM GEOL, V56, P219BAKER MB, 1996, J GEOPHYS RES-SOL EA, V101, P11715BARRAT JA, 1996, GEOSTANDARD NEWSLETT, V20, P133BORISOVA AY, 2002, CHEM GEOL, V183, P195BOSCH D, 1999, J C ABSTR, V4, P345BUREAU H, 1998, J VOLCANOL GEOTH RES, V84, P39BUREAU H, 1999, GEOPHYS RES LETT, V26, P3501CLAGUE DA, 1991, NATURE, V353, P553CLAGUE DA, 1995, J PETROL, V36, P299CLOCCHIATTI R, 1979, B MINERAL, V102, P511DENIEL C, 1992, J VOLCANOL GEOTH RES, V51, P253EILER JM, 1996, J GEOPHYS RES-SOL EA, V101, P11807FISK MR, 1988, J GEOPHYS RES, V93, P4933FRETZDORFF S, 2002, MINER PETROL, V75, P153GALLART J, 1999, J GEOPHYS RES-SOL EA, V104, P2895GARCIA MO, 1996, B VOLCANOL, V58, P359GARCIA MO, 1996, J GEOPHYS RES-SOL EA, V101, P11701GARCIA MO, 1998, J PETROL, V39, P803GARCIA MO, 2000, J PETROL, V41, P967GILLESPIE PH, 2000, BRIT J PLAST SURG, V53, P243GILLOT PY, 1989, J VOLCANOL GEOTH RES, V36, P53GILLOT PY, 1994, EARTH PLANET SC LETT, V122, P291GRAHAM D, 1990, NATURE, V347, P545GREEN K, 1994, ENVIRON ETHICS, V16, P117HART SR, 1999, GEOCHIM COSMOCHIM AC, V63, P4059HAURI EH, 1996, J GEOPHYS RES-SOL EA, V101, P11793HESS J, 1986, SCIENCE, V231, P979HOFMANN AW, 1986, EARTH PLANET SC LETT, V79, P33HOFMANN AW, 1988, EARTH PLANET SC LETT, V90, P297HOFMANN AW, 1996, J GEOPHYS RES-SOL EA, V101, P11831HOLM PM, 2002, CHEM GEOL, V184, P195KERR AC, 1996, CONTRIB MINERAL PETR, V124, P29KIEFFER G, 1977, CR ACAD SCI D NAT, V285, P957KLUGEL A, 2000, J GEOPHYS RES-SOL EA, V105, P5997LASSITER JC, 1996, J GEOPHYS RES-SOL EA, V101, P11769LENAT JF, 1988, MODELING VOLCANIC PR, P57LENAT JF, 2001, J GEOPHYS RES-SOL EA, V106, P8645LUAIS B, 2004, GEOCHEM GEOPHY GEOSY, V5LUDDEN JN, 1978, J VOLCANOL GEOTH RES, V4, P171LUGMAIR GW, 1992, GEOCHIM COSMOCHIM AC, V56, P1673MAHONEY JJ, 1998, J PETROL, V39, P1285MAHONEY JJ, 2002, EARTH PLANET SC LETT, V203, P295NORMAN MD, 1999, EARTH PLANET SC LETT, V168, P27NORMAN MD, 2002, CHEM GEOL, V183, P143OHARA MJ, 1968, EARTH-SCI REV, V4, P69ONIONS RK, 1998, EARTH PLANET SC LETT, V155, P15OVERSBY VM, 1972, GEOCHIM COSMOCHIM AC, V36, P1167PIETRUSZKA AJ, 1999, J PETROL, V40, P1321REHKAMPER M, 1998, INT J MASS SPECTROM, V181, P123RHODES JM, 1988, J GEOPHYS RES, V93, P4453SCHIANO P, 2001, NATURE, V412, P900SEMET MP, 2003, GEOPH RES ABSTR, V5, P10736SIGMARSSON O, 2001, J C ABSTR, V6, P807SLEEP NH, 1984, J GEOPHYS RES, V89, P10029STAUDACHER T, 1990, CHEM GEOL, V89, P1STAUDACHER T, 1998, B GLOBAL VOLCANISM N, V23, P2STAUDACHER T, 2001, J C ABSTR, V6, P825STIELTJES L, 1989, J VOLCANOL GEOTH RES, V36, P67THIRLWALL MF, 1997, CHEM GEOL, V135, P233THIRLWALL MF, 2002, CHEM GEOL, V184, P255UPTON BGJ, 1972, PHILOS T ROY SOC A, V271, P105VLASTELIC I, 2001, GEOCHIM COSMOCHIM AC, V65, P4303WHITE WM, 2000, CHEM GEOL, V167, P257