Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Sally J. Sutton"'
Autor:
Sally J. Sutton, Ian M. Hogan
Publikováno v:
Journal of Sedimentary Research. 84:1064-1078
Along the western edge of the Denver Basin, the arkosic Pennsylvanian–Permian Fountain Formation exposes hematite-bearing redbeds that have been partially whitened by the passage of reducing paleo-fluids. The fluids migrated mainly parallel to bedd
Publikováno v:
Chemical Geology. 362:74-81
Results of multiple sulfur isotope analyses from five Archean paleosols show the widespread presence of mass-independently fractionated sulfur in the regolith developed on the pre-2.5 Ga Earth. Analysis of sulfur from a small set of diamictite sample
Autor:
J. B. Maynard, Sally J. Sutton
Publikováno v:
Journal of African Earth Sciences. 42:95-118
Geochemical and petrographic data from the Konkola North deposit of the Zambian Copperbelt permits construction of a basement topography-driven fluid mixing model for mineralization. In this drill-core based study, the basement topography is inferred
Publikováno v:
AAPG Bulletin. 88:1185-1206
Shale units can be important barriers to fluid flow in sedimentary basins and commonly serve as seals to petroleum reservoirs. Little is known, however, about the controls on shale permeability. Consequently, variation in seal competency is one of th
Publikováno v:
The Journal of Geology. 104:55-70
The basement-Lamotte Formation unconformity in southeastern Missouri shows evidence of several distinctive alteration events, some of which may be related to migration of ore-forming fluids or K-rich basinal brines. The alterations are spatially rela
Publikováno v:
The Journal of Geology. 103:357-377
Near Delmas, in the Transvaal, a paleoweathering surface is developed beneath the Black Reef on hydrothermally altered granite (HAG). Au in the weathering profile averages 10 ppb, compared with 5 ppb in the HAG. The hydrothermal alteration converted
Autor:
Sally J. Sutton, J. B. Maynard
Publikováno v:
Canadian Journal of Earth Sciences. 30:1209-1223
Bulk chemistry, mineralogy, mineral chemistry, cathodoluminescence characteristics, and textural data are used to constrain provenance and the role of postdepositional alteration processes in sandstones of the lower Huronian Matinenda Formation. Samp
Autor:
J. B. Maynard, Sally J. Sutton
Publikováno v:
Canadian Journal of Earth Sciences. 30:60-76
Weathering profiles developed side-by-side on sandstone and a mafic dike provide an unusual opportunity to examine the role of parent rock bulk composition in the chemical evolution of middle Precambrian regoliths. Because the profiles are adjacent t
Publikováno v:
The Journal of Geology. 98:329-341
Within metamorphosed quartzites of the Witwatersrand Supergroup bulk chemistry is the major control on the distribution of metamorphic mineral phases and on their chemistry. Bulk chemistry is in turn controlled by stratigraphic position. Pyrophyllite