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TitleThe palynostratigraphy, age, and environment of strata penetrated by the Mallik 5L-38 gas-hydrate research well, Northwest Territories, determined by differentiating the recycled and contemporaneous palynomorphs
AuthorWhite, J M
SourceGeological Survey of Canada, Bulletin 604, 2015, 85 pages (3 sheets),
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication supercedes the following publications
File formatpdf
ProvinceNorthwest Territories
AreaMackenzie Delta; Beaufort Sea
Lat/Long WENS-134.7500 -134.5000 69.5000 69.4167
Subjectsfossil fuels; paleontology; palynological analyses; palynology; palynomorphs; palynostratigraphy; paleoclimates; hydrocarbons; gas; hydrocarbon gases; hydrate; methane; methane hydrate; petroleum resources; Mallik 5L-38; Mallik 2L; Tertiary; Cenozoic; Quaternary
Illustrationslocation maps; profiles; plots
ProgramMackenzie Corridor Project Management, GEM2: Geo-mapping for Energy and Minerals
Released2015 06 15
AbstractQuantitative palynostratigraphy of the Mallik 5L-38 well provides insight into palynomorph recycling and a Late Eocene age for the basal coals. Samples from 450 m to 900 m yielded a fraction on the 180 ?m screen having a high concentration of recycled palynomorphs, releasable by standard oxidation. The fraction that passed through the screen was not oxidized and yielded more in-place palynomorphs. This observation may affect interpretation of other regional upper Cenozoic studies of oxidized samples. The 0-270 m interval is interpreted to be late Pliocene to Pleistocene. The regional erosional unconformity below the Iperk Sequence is identified at 340 m, with other possible unconformities at 445 m and 550 m. The interval from 340 m to 700 m is thought to be Early Miocene. The 700-900 m interval is tentatively identified as Oligocene. Climate proxy ratios, compared with those of Mallik 2L-38 well between 670 m and 900 m are inconsistent, possibly due to low palynomorph counts or a change from a coherent Late Eocene record to a noisy Oligocene and younger record. An erosional unconformity near 930 m may have resulted from sea-level decline due to earliest Oligocene glaciation in Antarctica. Core samples from coal beds between 933.65 m and 1081.90 m yielded Late Eocene palynomorphs unlikely to be recycled, and some pollen associated with earlier Eocene ages. The coal swamps seem to be an environment where relict species can persist. A warm paleoclimate is indicated, consistent with an Eocene age.