Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica
Microfossil assemblages in Pliocene sediments from DSDP Site 274 (68°59.81'S, 173°2564'E) provide data on the age of the sediments and suggest the presence of Nothofagus (southern beach) in Antarctica during the Pliocene. A suite of 17 samples was collected in an interval from Samples 28-2...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.681805 2023-05-15T13:42:09+02:00 Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica Fleming, R Farley Barron, John A LATITUDE: -68.996800 * LONGITUDE: 173.427300 * DATE/TIME START: 1973-02-16T00:00:00 * DATE/TIME END: 1973-02-16T00:00:00 1996-02-11 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.681805 https://doi.org/10.1594/PANGAEA.681805 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.681805 https://doi.org/10.1594/PANGAEA.681805 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Fleming, R Farley; Barron, John A (1996): Evidence of Pliocene Abthofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274). Marine Micropaleontology, 27(1-4), 227-236, https://doi.org/10.1016/0377-8398(95)00062-3 28-274 Antarctic Ocean/CONT RISE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg28 Dataset 1996 ftpangaea https://doi.org/10.1594/PANGAEA.681805 https://doi.org/10.1016/0377-8398(95)00062-3 2023-01-20T07:31:07Z Microfossil assemblages in Pliocene sediments from DSDP Site 274 (68°59.81'S, 173°2564'E) provide data on the age of the sediments and suggest the presence of Nothofagus (southern beach) in Antarctica during the Pliocene. A suite of 17 samples was collected in an interval from Samples 28-274-6R-1, 83-87 cm to 28-274-11R-4, 73-77 cm (48.33-100.29 mbsf). Biostratigraphic study of the abundant diatom assemblages combined with published radiolarian data indicates that the sample interval ranges in age from 5.0 to 2.2 Ma, with an apparent unconformity between about 3.8 and 3.2 Ma. Nothofagidites (the genus for fossil pollen referable to Nothofagus) occurs throughout the interval, as well as pollen and spores with known stratigraphic ranges that unequivocally indicate reworking from older rocks. Species of Nothofagidites recovered include N. asperus, N. brachyspinulosus, N. flemingii, N. senectus, and N. sp. cf. N. lachlaniae; the latter form is previously known from the Sirius Group in the Transantarctic Mountains. Abundant palynomorphs were recovered in only three of the samples from Site 274 (Samples 28-274-9R-2,15-19 cm; 28-274-9R-2,48-52 cm; and 28-274-9R-2,65-69 cm). Based on the diatom and radiolarian biostratigraphic data, the ages of these samples range from 3.00 to 3.01 Ma. The relative abundance of N. sp. cf. N. lachlaniae in the three samples is an order of magnitude higher than relative abundances for the other species of Nothofagidites in the same samples. The signiticantly higher relative abundance of N. sp. cf. N. luchlaniae suggests that this pollen was derived from trees of Nothofugus that were living in Antarctica during the mid Pliocene. Diatom assemblages from these three samples indicate that sediments in this interval were rapidly deposited as biogenic oozes in an open-ocean setting relatively free of sea ice, thus decreasing the possibility of reworking from a single source bed rich in N. sp. cf. N. lachlaniae. Clearly, more detailed work in additional well-dated cores from around Antarctica is ... Dataset Antarc* Antarctic Antarctic Ocean Antarctica Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Transantarctic Mountains Antarctic Ocean Sirius ENVELOPE(163.250,163.250,-84.133,-84.133) Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Cape Adare ENVELOPE(175.000,175.000,-71.000,-71.000) ENVELOPE(173.427300,173.427300,-68.996800,-68.996800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
28-274 Antarctic Ocean/CONT RISE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg28 |
spellingShingle |
28-274 Antarctic Ocean/CONT RISE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg28 Fleming, R Farley Barron, John A Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica |
topic_facet |
28-274 Antarctic Ocean/CONT RISE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg28 |
description |
Microfossil assemblages in Pliocene sediments from DSDP Site 274 (68°59.81'S, 173°2564'E) provide data on the age of the sediments and suggest the presence of Nothofagus (southern beach) in Antarctica during the Pliocene. A suite of 17 samples was collected in an interval from Samples 28-274-6R-1, 83-87 cm to 28-274-11R-4, 73-77 cm (48.33-100.29 mbsf). Biostratigraphic study of the abundant diatom assemblages combined with published radiolarian data indicates that the sample interval ranges in age from 5.0 to 2.2 Ma, with an apparent unconformity between about 3.8 and 3.2 Ma. Nothofagidites (the genus for fossil pollen referable to Nothofagus) occurs throughout the interval, as well as pollen and spores with known stratigraphic ranges that unequivocally indicate reworking from older rocks. Species of Nothofagidites recovered include N. asperus, N. brachyspinulosus, N. flemingii, N. senectus, and N. sp. cf. N. lachlaniae; the latter form is previously known from the Sirius Group in the Transantarctic Mountains. Abundant palynomorphs were recovered in only three of the samples from Site 274 (Samples 28-274-9R-2,15-19 cm; 28-274-9R-2,48-52 cm; and 28-274-9R-2,65-69 cm). Based on the diatom and radiolarian biostratigraphic data, the ages of these samples range from 3.00 to 3.01 Ma. The relative abundance of N. sp. cf. N. lachlaniae in the three samples is an order of magnitude higher than relative abundances for the other species of Nothofagidites in the same samples. The signiticantly higher relative abundance of N. sp. cf. N. luchlaniae suggests that this pollen was derived from trees of Nothofugus that were living in Antarctica during the mid Pliocene. Diatom assemblages from these three samples indicate that sediments in this interval were rapidly deposited as biogenic oozes in an open-ocean setting relatively free of sea ice, thus decreasing the possibility of reworking from a single source bed rich in N. sp. cf. N. lachlaniae. Clearly, more detailed work in additional well-dated cores from around Antarctica is ... |
format |
Dataset |
author |
Fleming, R Farley Barron, John A |
author_facet |
Fleming, R Farley Barron, John A |
author_sort |
Fleming, R Farley |
title |
Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica |
title_short |
Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica |
title_full |
Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica |
title_fullStr |
Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica |
title_full_unstemmed |
Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica |
title_sort |
mid-pliocene diatom and palynological assemblages north-northeast of cape adare, antarctica |
publisher |
PANGAEA |
publishDate |
1996 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.681805 https://doi.org/10.1594/PANGAEA.681805 |
op_coverage |
LATITUDE: -68.996800 * LONGITUDE: 173.427300 * DATE/TIME START: 1973-02-16T00:00:00 * DATE/TIME END: 1973-02-16T00:00:00 |
long_lat |
ENVELOPE(163.250,163.250,-84.133,-84.133) ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(175.000,175.000,-71.000,-71.000) ENVELOPE(173.427300,173.427300,-68.996800,-68.996800) |
geographic |
Antarctic Transantarctic Mountains Antarctic Ocean Sirius Adare Cape Adare |
geographic_facet |
Antarctic Transantarctic Mountains Antarctic Ocean Sirius Adare Cape Adare |
genre |
Antarc* Antarctic Antarctic Ocean Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctica Sea ice |
op_source |
Supplement to: Fleming, R Farley; Barron, John A (1996): Evidence of Pliocene Abthofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274). Marine Micropaleontology, 27(1-4), 227-236, https://doi.org/10.1016/0377-8398(95)00062-3 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.681805 https://doi.org/10.1594/PANGAEA.681805 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.681805 https://doi.org/10.1016/0377-8398(95)00062-3 |
_version_ |
1766163285597487104 |