Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II).
A study of distribution patterns of benthic foraminifera from the Recent and late Pleistocene northwestern gulf of Mexico revealed a close relationship between assemblages and water masses. Multivariate analyses (cluster and factor) of species-frequency data from 120 core tops (87-1361 m) show that...
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ftlouisianastuir:oai:repository.lsu.edu:gradschool_disstheses-5907 2024-09-15T18:24:13+00:00 Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). Denne, Richard Allen 1990-01-01T08:00:00Z application/pdf https://repository.lsu.edu/gradschool_disstheses/4908 https://doi.org/10.31390/gradschool_disstheses.4908 https://repository.lsu.edu/context/gradschool_disstheses/article/5907/viewcontent/9104125.pdf English eng LSU Scholarly Repository https://repository.lsu.edu/gradschool_disstheses/4908 doi:10.31390/gradschool_disstheses.4908 https://repository.lsu.edu/context/gradschool_disstheses/article/5907/viewcontent/9104125.pdf LSU Historical Dissertations and Theses Paleontology text 1990 ftlouisianastuir https://doi.org/10.31390/gradschool_disstheses.4908 2024-08-08T04:27:17Z A study of distribution patterns of benthic foraminifera from the Recent and late Pleistocene northwestern gulf of Mexico revealed a close relationship between assemblages and water masses. Multivariate analyses (cluster and factor) of species-frequency data from 120 core tops (87-1361 m) show that the assemblages are associated with the Surface Mixed Layer, Gulf Water, Oxygen Minimum Water, Subantarctic Intermediate Water, Caribbean Midwater, and the Mississippi River outflow. A similar study of 61 samples (283-1341 m) from the last glacial (15,000 yBP) delineated the boundaries of the late Pleistocene bathyal water masses. These were (in estimated paleodepths) the Subtropical Underwater (100?-350 m), Oxygen Minimum Water (350-570 m), North Atlantic Intermediate Water (570-775 m), and Mediterrenean Outflow Water (775+ m). A delta assemblage was also detected between 91 to 92$\sp{\rm o}$ W. Downcore abundances of species in a core from 726 m depth revealed 3 benthic faunal events, at 13,000, 11,000, and 5,000 yBP, caused by changes in water masses and organic matter content. Factor analysis of presence/absence data of 157 species from 288 core tops (58-1361 m) and the 61 late Pleistocene samples indicated that presence/absence data can be used in paleoceanographic studies; the assemblages could be directly correlated to the water masses, delta outflow, and the carbonate bank environment. A study of downcore variations in 10 box cores was done to determine if abundances of Recent and late Pleistocene benthic foraminifera can be directly compared. Judging by downcore trends produced by taphonomy and living habitat, agglutinated species were dissagregation prone or resistant, while calcareous hyaline species were highly-, moderately-, or poorly-preserved. A preservation index based on these trends shows similar values for the Recent and late Pleistocene samples, indicating that their distributions can be directly compared. Such a comparison demonstrates that distributions of species are affected by water mass ... Text North Atlantic LSU Digital Commons (Louisiana State University) |
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LSU Digital Commons (Louisiana State University) |
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language |
English |
topic |
Paleontology |
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Paleontology Denne, Richard Allen Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). |
topic_facet |
Paleontology |
description |
A study of distribution patterns of benthic foraminifera from the Recent and late Pleistocene northwestern gulf of Mexico revealed a close relationship between assemblages and water masses. Multivariate analyses (cluster and factor) of species-frequency data from 120 core tops (87-1361 m) show that the assemblages are associated with the Surface Mixed Layer, Gulf Water, Oxygen Minimum Water, Subantarctic Intermediate Water, Caribbean Midwater, and the Mississippi River outflow. A similar study of 61 samples (283-1341 m) from the last glacial (15,000 yBP) delineated the boundaries of the late Pleistocene bathyal water masses. These were (in estimated paleodepths) the Subtropical Underwater (100?-350 m), Oxygen Minimum Water (350-570 m), North Atlantic Intermediate Water (570-775 m), and Mediterrenean Outflow Water (775+ m). A delta assemblage was also detected between 91 to 92$\sp{\rm o}$ W. Downcore abundances of species in a core from 726 m depth revealed 3 benthic faunal events, at 13,000, 11,000, and 5,000 yBP, caused by changes in water masses and organic matter content. Factor analysis of presence/absence data of 157 species from 288 core tops (58-1361 m) and the 61 late Pleistocene samples indicated that presence/absence data can be used in paleoceanographic studies; the assemblages could be directly correlated to the water masses, delta outflow, and the carbonate bank environment. A study of downcore variations in 10 box cores was done to determine if abundances of Recent and late Pleistocene benthic foraminifera can be directly compared. Judging by downcore trends produced by taphonomy and living habitat, agglutinated species were dissagregation prone or resistant, while calcareous hyaline species were highly-, moderately-, or poorly-preserved. A preservation index based on these trends shows similar values for the Recent and late Pleistocene samples, indicating that their distributions can be directly compared. Such a comparison demonstrates that distributions of species are affected by water mass ... |
format |
Text |
author |
Denne, Richard Allen |
author_facet |
Denne, Richard Allen |
author_sort |
Denne, Richard Allen |
title |
Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). |
title_short |
Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). |
title_full |
Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). |
title_fullStr |
Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). |
title_full_unstemmed |
Late Quaternary Foraminifera of the Northwestern Gulf of Mexico. (Volumes I and II). |
title_sort |
late quaternary foraminifera of the northwestern gulf of mexico. (volumes i and ii). |
publisher |
LSU Scholarly Repository |
publishDate |
1990 |
url |
https://repository.lsu.edu/gradschool_disstheses/4908 https://doi.org/10.31390/gradschool_disstheses.4908 https://repository.lsu.edu/context/gradschool_disstheses/article/5907/viewcontent/9104125.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
LSU Historical Dissertations and Theses |
op_relation |
https://repository.lsu.edu/gradschool_disstheses/4908 doi:10.31390/gradschool_disstheses.4908 https://repository.lsu.edu/context/gradschool_disstheses/article/5907/viewcontent/9104125.pdf |
op_doi |
https://doi.org/10.31390/gradschool_disstheses.4908 |
_version_ |
1810464533999779840 |