Chemistry of zeolithe and clays from Central Kerguelen Plateau basalts


Autoria(s): Sevigny, James H; Whitechurch, Hubert; Storey, Michael; Salters, Vincent JM
Cobertura

MEDIAN LATITUDE: -57.375400 * MEDIAN LONGITUDE: 77.799100 * SOUTH-BOUND LATITUDE: -58.717000 * WEST-BOUND LONGITUDE: 76.407500 * NORTH-BOUND LATITUDE: -54.811000 * EAST-BOUND LONGITUDE: 81.239500 * DATE/TIME START: 1988-03-09T06:45:00 * DATE/TIME END: 1988-04-23T04:00:00

Data(s)

08/03/1992

Resumo

Ocean Drilling Program Leg 120 recovered basement samples that consisted of zeolite-facies metabasalts at Sites 747, 749, and 750 on the Kerguelen Plateau. These basalts were metamorphosed in the low to intermediate zones of the zeolite facies, as indicated by the presence of diagnostic zeolites and the absence of chlorite, epidote, prehnite, pumpellyite, and wairakite. Chabazite, natrolite, thompsonite, mesolite, stilbite, huelandite, and smectites occur as amygduloidal fillings in basalts from Holes 747C and 750B, whereas only stilbite, laumontite, and pure and mixed-layered smectites were identified in amygduloidal basalts from Hole 749C. In the lower sections of Hole 749C, only laumontite and mixed-layered smectites coexist. Based on calculations with published experimental phase equilibria, the absence of wairakite in basalts from Hole 749C and of laumontite in basalts from Holes 747C and 750B suggests that metamorphic temperatures did not exceed approximately 225° and 120°C, respectively. The presence of well-developed zeolite mineral assemblages and the absence of carbonate and clay mineral assemblages restricts XCO2 in the fluid to approximately <=0.0075. Low- to intermediate-zone zeolite-facies mineral assemblages in basalts from the Kerguelen Plateau can be accounted for by metamorphism in an active geothermal area such as present-day Iceland.

Formato

application/zip, 3 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.758084

doi:10.1594/PANGAEA.758084

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Sevigny, James H; Whitechurch, Hubert; Storey, Michael; Salters, Vincent JM (1992): Zeolithe-facies metamorphism of Central Kerguelen Plateau basalts. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 63-69, doi:10.2973/odp.proc.sr.120.117.1992

Palavras-Chave #120-747C; 120-749C; 120-750B; Al; Al2O3; Aluminium; Aluminium oxide; as total iron; Ca; Cal; Calcite; Calcium; Calcium oxide; CaO; Cbz; Chabazite; Clay min; Clay minerals; DRILL; Drilling/drill rig; Electron microprobe; Event; Factor; Fe; FeO; from Gottardi and Galli (1985); H2O; Heulandite; Hul; Hydroxide; Iron 2+ and 3+; Iron oxide, FeO; Joides Resolution; K; K2O; Label 2; Laumontite; Leg120; Lithology; Lithology/composition/facies; Lmt; Magnesium; Magnesium oxide; Mes; Mesolite; Mg; MgO; Mineral; Mineral name; Na; Na/Ca; Na2O; Natrolite; No O; Ntr; Number of oxygens; Ocean Drilling Program; ODP; ODP sample designation; OH; Potassium; Potassium oxide; Sample code/label; Sample code/label 2; Si; Si/Al; Silicon; Silicon/Aluminium ratio; Silicon dioxide; SiO2; Sodium; Sodium/Calcium ratio; Sodium oxide; South Indian Ridge, South Indian Ocean; Stb; Stilbite; Sum; Thomps; Thompsonite; Water in rock
Tipo

Dataset