Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event
Dissertation (Ph.D.) University of Alaska Fairbanks, 2014 I studied the paleoclimate and paleoenvironmental conditions of the Prince Creek Formation, North Slope Alaska, and the lower Cantwell Formation in Denali National Park, Alaska. I used data from pollen analysis, clay mineral analysis and stab...
Main Author: | |
---|---|
Other Authors: | , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | unknown |
Published: |
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/11122/4579 |
id |
ftunivalaska:oai:scholarworks.alaska.edu:11122/4579 |
---|---|
record_format |
openpolar |
spelling |
ftunivalaska:oai:scholarworks.alaska.edu:11122/4579 2023-05-15T15:47:00+02:00 Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event Salazar Jaramillo, Susana Fowell, Sarah McCarthy, Paul Trainor, Tom Druckenmiller, Patrick 2014-05 http://hdl.handle.net/11122/4579 unknown http://hdl.handle.net/11122/4579 Department of Geology and Geophysics Dissertation phd 2014 ftunivalaska 2023-02-23T21:36:15Z Dissertation (Ph.D.) University of Alaska Fairbanks, 2014 I studied the paleoclimate and paleoenvironmental conditions of the Prince Creek Formation, North Slope Alaska, and the lower Cantwell Formation in Denali National Park, Alaska. I used data from pollen analysis, clay mineral analysis and stable isotope analysis of clay minerals and organic matter applied to paleosols of the Prince Creek Formation. In the lower Cantwell Formation, I reconstructed the sedimentary environment, produced a terrestrial carbon stable isotope record and obtained a ~ 69.5 Ma radiometric age for the lower Cantwell Formation. Clay analysis in the Prince Creek Formation indicates that the genesis of the paleosols was strongly influenced by the properties of the parent material and that an epiclastic bentonitic source contributed to the development of non-allophanic properties which suggests the presence of Andept-like paleosols. Paleosols formed on the floodplains of the Prince Creek Formation reveal features attributed to wet-dry cycles as a result of seasonal flooding, perhaps due to snow melt in the ancestral Brooks Range. Carbon and oxygen isotope analyses, and the geochemistry of paleosol Bw/Bt horizons indicate mean annual precipitation values between 745.56 and 1426.88 ±221.38 mm/yr and mean annual temperatures of 12 ±4.4 °C. The meteoric water δ¹⁸O value calculated from smectite at a 6.3 °C mean annual temperature is ~-24 ⁰/₀₀. The calculated value is δ¹⁸O-depleted as is expected for high latitudes during the Late Cretaceous. Sedimentary facies analysis suggests that The East Fork measured section of the lower Cantwell Formation was likely deposited in the distal part of an alluvial fan. A new U-Pb age of 69.5 ±0.7 Ma from bentonites and carbon isotope values of bulk sedimentary organic matter and wood fragments indicates that a greenhouse event, known as the mid-Maastrichtian Event (MME), is recorded at the East Fork of the Toklat River Section. A mean annual precipitation value of ~ 517.92 ±134.44 mm/yr was obtained from ... Doctoral or Postdoctoral Thesis Brooks Range north slope Alaska University of Alaska: ScholarWorks@UA Fairbanks Prince Creek ENVELOPE(-38.067,-38.067,-54.017,-54.017) |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
unknown |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 2014 I studied the paleoclimate and paleoenvironmental conditions of the Prince Creek Formation, North Slope Alaska, and the lower Cantwell Formation in Denali National Park, Alaska. I used data from pollen analysis, clay mineral analysis and stable isotope analysis of clay minerals and organic matter applied to paleosols of the Prince Creek Formation. In the lower Cantwell Formation, I reconstructed the sedimentary environment, produced a terrestrial carbon stable isotope record and obtained a ~ 69.5 Ma radiometric age for the lower Cantwell Formation. Clay analysis in the Prince Creek Formation indicates that the genesis of the paleosols was strongly influenced by the properties of the parent material and that an epiclastic bentonitic source contributed to the development of non-allophanic properties which suggests the presence of Andept-like paleosols. Paleosols formed on the floodplains of the Prince Creek Formation reveal features attributed to wet-dry cycles as a result of seasonal flooding, perhaps due to snow melt in the ancestral Brooks Range. Carbon and oxygen isotope analyses, and the geochemistry of paleosol Bw/Bt horizons indicate mean annual precipitation values between 745.56 and 1426.88 ±221.38 mm/yr and mean annual temperatures of 12 ±4.4 °C. The meteoric water δ¹⁸O value calculated from smectite at a 6.3 °C mean annual temperature is ~-24 ⁰/₀₀. The calculated value is δ¹⁸O-depleted as is expected for high latitudes during the Late Cretaceous. Sedimentary facies analysis suggests that The East Fork measured section of the lower Cantwell Formation was likely deposited in the distal part of an alluvial fan. A new U-Pb age of 69.5 ±0.7 Ma from bentonites and carbon isotope values of bulk sedimentary organic matter and wood fragments indicates that a greenhouse event, known as the mid-Maastrichtian Event (MME), is recorded at the East Fork of the Toklat River Section. A mean annual precipitation value of ~ 517.92 ±134.44 mm/yr was obtained from ... |
author2 |
Fowell, Sarah McCarthy, Paul Trainor, Tom Druckenmiller, Patrick |
format |
Doctoral or Postdoctoral Thesis |
author |
Salazar Jaramillo, Susana |
spellingShingle |
Salazar Jaramillo, Susana Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event |
author_facet |
Salazar Jaramillo, Susana |
author_sort |
Salazar Jaramillo, Susana |
title |
Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event |
title_short |
Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event |
title_full |
Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event |
title_fullStr |
Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event |
title_full_unstemmed |
Paleoclimate and paleoenvironment of the Prince Creek and Cantwell formations, Alaska: terrestrial evidence of middle Maastrichtian greenhouse event |
title_sort |
paleoclimate and paleoenvironment of the prince creek and cantwell formations, alaska: terrestrial evidence of middle maastrichtian greenhouse event |
publishDate |
2014 |
url |
http://hdl.handle.net/11122/4579 |
long_lat |
ENVELOPE(-38.067,-38.067,-54.017,-54.017) |
geographic |
Fairbanks Prince Creek |
geographic_facet |
Fairbanks Prince Creek |
genre |
Brooks Range north slope Alaska |
genre_facet |
Brooks Range north slope Alaska |
op_relation |
http://hdl.handle.net/11122/4579 Department of Geology and Geophysics |
_version_ |
1766381803061379072 |