Mineralogy and diagenesis of miocene and pleistocene sediments, Northeastern Gulf of Mexico
Conference
·
OSTI ID:6639380
Cored Miocene and Pleistocene sediments from the northeastern Gulf of Mexico (ranging in depth from 1,400 to 2,000 m) consist of interbedded sands, silts, and muds with varying degrees of consolidation. Samples selected from these sediments were studied for their mineralogy and diagenesis. The Miocene sediments represent various subenvironments of the ancestral Mississippi River delta complex; Pleistocene sediments are marine shelf deposits. Sands from both Miocene and Pleistocene cores are fine to very fine-grained feldspathic litharenites with abundant (approx. = 25%) matrix fines and minor (<7%) carbonate clasts and shell fragments. Carbonate diagenesis is a continuing process in these sediments. Clayey sands contain disseminated siderite crystallites formed during organic matter fermentation. In clean sands, scattered thin (<15 cm) bands of poikilotopic carbonate-cemented sand are present in the middle of thicker unconsolidated intervals. Cemented bands are thicker in the Miocene section, having grown during burial through dissolution of shell fragments and reprecipitation at the margin of cemented zones. Diagenetic events evident in the Miocene core illustrate processes that could occur in the Pleistocene sediments with continued burial. These are: (1) dolomitization of some calcite cements, (2) precipitation of Fe-carbonate as crystallites, rims on dolomite cements, and overgrowths on siderite crystallites, and (3) zeolite formation on amorphous silica substrates. Amorphous silica is associated with limited dissolution of feldspars or lithic fragments.
- OSTI ID:
- 6639380
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ATLANTIC OCEAN
BIOGEOCHEMISTRY
CARBONATE ROCKS
CARIBBEAN SEA
CATAGENESIS
CENOZOIC ERA
CHALCOGENIDES
CHEMISTRY
EXPLORATION
FELDSPARS
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GULF OF MEXICO
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEAS
SEDIMENTARY ROCKS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SURFACE WATERS
TERTIARY PERIOD
ZEOLITES
020200* -- Petroleum-- Reserves
Geology
& Exploration
ATLANTIC OCEAN
BIOGEOCHEMISTRY
CARBONATE ROCKS
CARIBBEAN SEA
CATAGENESIS
CENOZOIC ERA
CHALCOGENIDES
CHEMISTRY
EXPLORATION
FELDSPARS
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GULF OF MEXICO
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEAS
SEDIMENTARY ROCKS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SURFACE WATERS
TERTIARY PERIOD
ZEOLITES