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TitleLate Mesozoic sediment provenance on Georges Bank: enlargement of drainages to the Atlantic Ocean in the Late Jurassic-Early Cretaceous
AuthorChavez, I; Pe-Piper, G; Piper, D J WORCID logo; MacRae, R A
SourceAmerican Association of Petroleum Geologists Bulletin vol. 103, no. 6, 2019 p. 1321-1350,
Alt SeriesNatural Resources Canada, Contribution Series 20170363
PublisherAmerican Association of Petroleum Geologists
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
ProvinceNova Scotia; Eastern offshore region
NTS10; 20
AreaGeorges Bank; Atlantic Ocean; Gulf of Maine; Massachusetts; Rhode Island; Canada; United States of America
Lat/Long WENS -70.0000 -63.0000 43.5000 40.0000
Subjectsmarine geology; mineralogy; geochemistry; geochronology; fossil fuels; clasts; provenance; source areas; continental margins; continental shelf; paleodrainage; fluvial deposits; fluviomarine deposits; discharge rates; detrital minerals; diagenesis; wells; heavy mineral samples; heavy mineral analyses; spectroscopic analyses; sedimentary basins; bedrock geology; lithology; sedimentary rocks; sandstones; radiometric dating; zircon dates; uranium lead dates; lead lead dates; paleoenvironment; paleoclimates; tectonic setting; structural features; faults; grabens; core samples; thin section microscopy; whole rock geochemistry; trace element geochemistry; scanning electron microscope analyses; electron probe analyses; petroleum resources; hydrocarbons; hydrocarbon potential; reservoir rocks; Georges Bank Basin; Continental Offshore Stratigraphic Test G-2 Well; Sable River; Peri-gondwanan Realm; Appalachian Province; Scotian Basin; Central Maine Belt; Coastal Maine Belt; Long Island Platform; Gander Terrane; Shelburne Delta; Yarmouth Arch; Lahave Platform; Shelburne Subbasin; Fundy Graben; Avalonia; Meguma Terrane; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Paleozoic; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; stratigraphic charts; geophysical logs; profiles; lithologic sections; pie charts; tables; photomicrographs; ternary diagrams; bar graphs; plots; spectra; frequency distribution diagrams; histograms
ProgramGeoscience for New Energy Supply (GNES) Frontier basin analysis
Released2019 06 15
AbstractThe detrital mineralogy of Upper Jurassic to Lower Cretaceous sandstones from the Continental Offshore Stratigraphic Test G-2 well in the Georges Bank Basin was studied to better understand the varying supply of clastic sediment to the basin. Heavy minerals separated from cuttings were identified by chemical analyses, zircons were dated, and Raman spectroscopy was applied to identify titania polymorphs (rutile, anatase, and brookite). Upper Jurassic (Oxfordian) sands contain tourmaline, fluorapatite, Mn-almandine and grossular garnets (derived from the central Maine and coastal Maine belts), and pumice and trachytes reworked from volcanics in the Long Island platform. Zircon geochronology (300-450 and 550-700 Ma) supports sources from peri-Gondwanan Appalachian terranes. Lower Cretaceous heavy minerals show that Oxfordian supply was diluted to 30%, mostly by additional ilmenite, zircon, tourmaline, and staurolite, probably by components from central and northern Maine and New Brunswick. Rutile and anatase from metapelites are more common than in the Oxfordian, where mafic igneous sources predominate. Lower Cretaceous zircons include a few Mesoproterozoic grains that might be reworked from middle Paleozoic sedimentary rocks in the Gander terrane of northern Maine and New Brunswick, although subhedral grains together with rare chromite may indicate minor or intermittent supply from the Sable River draining Labrador. Heavy minerals provided important provenance information not available from zircon geochronology alone. Progressive enlargement of the catchment area resulted from an increasingly humid climate in the latest Jurassic and active mostly northeast-trending faults in the Early Cretaceous. This resulted in greater supply of petrographically more-mature sand to the basin.
Summary(Plain Language Summary, not published)
Diagnostic minerals in sandstones from the COST G-2 well on the US part of Georges Bank show that there was limited local sand supply to potential hydrocarbon reservoirs.

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