| Title | The 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 |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | White, J M |
| Source | Geological Survey of Canada, Bulletin 604, 2015, 85 pages (3 sheets), https://doi.org/10.4095/296502  Open Access |
| Year | 2015 |
| Publisher | Natural Resources Canada |
| Edition | rev. |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication supercedes the following
publications |
| File format | pdf |
| Province | Northwest Territories |
| NTS | 107C/06NW |
| Area | Mackenzie Delta; Beaufort Sea |
| Lat/Long WENS | -134.7500 -134.5000 69.5000 69.4167 |
| Subjects | fossil 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 |
| Illustrations | location maps; profiles; plots |
| Program | GEM2: Geo-mapping for Energy and Minerals Mackenzie Corridor Project Management |
| Released | 2015 06 15 |
| Abstract | Quantitative 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. |
| GEOSCAN ID | 296502 |
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