Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3)
Lower Miocene diatoms and other siliceous microfossils in the Cape Robcrts Project drillcore (CRP-l), Roberts Ridge, western McMurdo Sound, are documented. Diatom biostratigraphy, along with 87Sr/86Sr ratios from mollusk shells and 40Ar/39Ar data from volcanic materials, constrain the interpretation...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1998
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.433491 https://doi.org/10.1594/PANGAEA.433491 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.433491 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.433491 2023-05-15T13:50:46+02:00 Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) Harwood, David M Bohaty, Steven M Scherer, Reed P LATITUDE: -77.007580 * LONGITUDE: 163.755080 * DATE/TIME START: 1997-10-17T01:30:00 * DATE/TIME END: 1997-10-24T02:00:00 * MINIMUM DEPTH, sediment/rock: 53.550 m * MAXIMUM DEPTH, sediment/rock: 147.685 m 1998-01-15 text/tab-separated-values, 993 data points https://doi.pangaea.de/10.1594/PANGAEA.433491 https://doi.org/10.1594/PANGAEA.433491 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.433491 https://doi.org/10.1594/PANGAEA.433491 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Harwood, David M; Bohaty, Steven M; Scherer, Reed P (1998): Lower Miocene diatom biostratigraphy of the CRP-1 drillcore, McMurdo Sound, Antarctica. Terra Antartica, 5(3), 499-514, hdl:10013/epic.28337.d001 16 km ENE Cape Roberts Abundance estimate Arachnoidiscus sp. Asteromphalus symmetricus Cape Roberts Project Cavitatus jouseanus Cavitatus miocenica Cavitatus rectus Corbisema triacantha Core wireline system Counting >25 µm fraction CRP CRP-1 CWS Cymatosira biharensis Dactyliosolen antarcticus Depth bottom/max sediment/rock top/min Diatoms indeterminata Estimated Fragilariopsis sp. Hercotheca inermis Lithologic unit/sequence off Cape Roberts Ross Sea Antarctica Preservation Rhabdonema sp. Rhizosolenia sp. Sampling/drilling ice Septamesocena pappii Siliceous microfossils Stephanopyxis sp. Stephanopyxis spinosissima Thalassiosira nansenii Thalassiosira praefraga Tigeria spp. Trinacria racovitzae Dataset 1998 ftpangaea https://doi.org/10.1594/PANGAEA.433491 2023-01-20T08:18:53Z Lower Miocene diatoms and other siliceous microfossils in the Cape Robcrts Project drillcore (CRP-l), Roberts Ridge, western McMurdo Sound, are documented. Diatom biostratigraphy, along with 87Sr/86Sr ratios from mollusk shells and 40Ar/39Ar data from volcanic materials, constrain the interpretation of the magnetic polarity stratigraphy and allows construction of an age model for CRP-1. Together, these records indicate an age span from to ~21.5 Ma at 147.69 mbsf (the bottom of the hole) to ~17.5 Ma at 43.15 mbsf (top of the lower Miocene interval). Important diatom datums identified in this drillcore are the FAD and LAD of Thalassiosira praefraga and the LAD of Cavitatus rectus. Variation in diatom abundance and assemblage composition through the lower Miocene reflects changes in depositional environment. There are intervals of repeated ice cover (floating or grounded) in the lower Miocene section of CRP-1, where diatom production was limited, and intervals where diatoms were growing in open, although at times shallow (<35 m), marine seas. Relative numbers of planktic to benthic diatoms often parallel similar indices of water depth from sedimentologic and sequencestratigraphic interpretations. Approximately 70 diatom taxa, in addition to 2 silicoflagellate and 2 ebridian taxa, are reported. No radiolarians were encountered. Three tentative diatom biostratigraphic zones are introduced, though not formally named in this report. A Ross Sea diatom zonation for the lower Miocene to upper Eocene is under development, for future publication. The forthcoming zonation will incorporate diatom biostratigraphic information from CRP-l and CRP-2, and earlier stratigraphic drilling in McMurdo Sound, as well as magnetostratigraphically calibrated datums from the Southern Ocean. Dataset Antarc* Antarctica antarcticus McMurdo Sound Ross Sea Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) McMurdo Sound Roberts Ridge ENVELOPE(-131.500,-131.500,-86.383,-86.383) Ross Sea Southern Ocean ENVELOPE(163.755080,163.755080,-77.007580,-77.007580) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
16 km ENE Cape Roberts Abundance estimate Arachnoidiscus sp. Asteromphalus symmetricus Cape Roberts Project Cavitatus jouseanus Cavitatus miocenica Cavitatus rectus Corbisema triacantha Core wireline system Counting >25 µm fraction CRP CRP-1 CWS Cymatosira biharensis Dactyliosolen antarcticus Depth bottom/max sediment/rock top/min Diatoms indeterminata Estimated Fragilariopsis sp. Hercotheca inermis Lithologic unit/sequence off Cape Roberts Ross Sea Antarctica Preservation Rhabdonema sp. Rhizosolenia sp. Sampling/drilling ice Septamesocena pappii Siliceous microfossils Stephanopyxis sp. Stephanopyxis spinosissima Thalassiosira nansenii Thalassiosira praefraga Tigeria spp. Trinacria racovitzae |
spellingShingle |
16 km ENE Cape Roberts Abundance estimate Arachnoidiscus sp. Asteromphalus symmetricus Cape Roberts Project Cavitatus jouseanus Cavitatus miocenica Cavitatus rectus Corbisema triacantha Core wireline system Counting >25 µm fraction CRP CRP-1 CWS Cymatosira biharensis Dactyliosolen antarcticus Depth bottom/max sediment/rock top/min Diatoms indeterminata Estimated Fragilariopsis sp. Hercotheca inermis Lithologic unit/sequence off Cape Roberts Ross Sea Antarctica Preservation Rhabdonema sp. Rhizosolenia sp. Sampling/drilling ice Septamesocena pappii Siliceous microfossils Stephanopyxis sp. Stephanopyxis spinosissima Thalassiosira nansenii Thalassiosira praefraga Tigeria spp. Trinacria racovitzae Harwood, David M Bohaty, Steven M Scherer, Reed P Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) |
topic_facet |
16 km ENE Cape Roberts Abundance estimate Arachnoidiscus sp. Asteromphalus symmetricus Cape Roberts Project Cavitatus jouseanus Cavitatus miocenica Cavitatus rectus Corbisema triacantha Core wireline system Counting >25 µm fraction CRP CRP-1 CWS Cymatosira biharensis Dactyliosolen antarcticus Depth bottom/max sediment/rock top/min Diatoms indeterminata Estimated Fragilariopsis sp. Hercotheca inermis Lithologic unit/sequence off Cape Roberts Ross Sea Antarctica Preservation Rhabdonema sp. Rhizosolenia sp. Sampling/drilling ice Septamesocena pappii Siliceous microfossils Stephanopyxis sp. Stephanopyxis spinosissima Thalassiosira nansenii Thalassiosira praefraga Tigeria spp. Trinacria racovitzae |
description |
Lower Miocene diatoms and other siliceous microfossils in the Cape Robcrts Project drillcore (CRP-l), Roberts Ridge, western McMurdo Sound, are documented. Diatom biostratigraphy, along with 87Sr/86Sr ratios from mollusk shells and 40Ar/39Ar data from volcanic materials, constrain the interpretation of the magnetic polarity stratigraphy and allows construction of an age model for CRP-1. Together, these records indicate an age span from to ~21.5 Ma at 147.69 mbsf (the bottom of the hole) to ~17.5 Ma at 43.15 mbsf (top of the lower Miocene interval). Important diatom datums identified in this drillcore are the FAD and LAD of Thalassiosira praefraga and the LAD of Cavitatus rectus. Variation in diatom abundance and assemblage composition through the lower Miocene reflects changes in depositional environment. There are intervals of repeated ice cover (floating or grounded) in the lower Miocene section of CRP-1, where diatom production was limited, and intervals where diatoms were growing in open, although at times shallow (<35 m), marine seas. Relative numbers of planktic to benthic diatoms often parallel similar indices of water depth from sedimentologic and sequencestratigraphic interpretations. Approximately 70 diatom taxa, in addition to 2 silicoflagellate and 2 ebridian taxa, are reported. No radiolarians were encountered. Three tentative diatom biostratigraphic zones are introduced, though not formally named in this report. A Ross Sea diatom zonation for the lower Miocene to upper Eocene is under development, for future publication. The forthcoming zonation will incorporate diatom biostratigraphic information from CRP-l and CRP-2, and earlier stratigraphic drilling in McMurdo Sound, as well as magnetostratigraphically calibrated datums from the Southern Ocean. |
format |
Dataset |
author |
Harwood, David M Bohaty, Steven M Scherer, Reed P |
author_facet |
Harwood, David M Bohaty, Steven M Scherer, Reed P |
author_sort |
Harwood, David M |
title |
Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) |
title_short |
Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) |
title_full |
Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) |
title_fullStr |
Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) |
title_full_unstemmed |
Miocene siliceous microfossil occurence of sediment core CRP-1 (Table 3) |
title_sort |
miocene siliceous microfossil occurence of sediment core crp-1 (table 3) |
publisher |
PANGAEA |
publishDate |
1998 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.433491 https://doi.org/10.1594/PANGAEA.433491 |
op_coverage |
LATITUDE: -77.007580 * LONGITUDE: 163.755080 * DATE/TIME START: 1997-10-17T01:30:00 * DATE/TIME END: 1997-10-24T02:00:00 * MINIMUM DEPTH, sediment/rock: 53.550 m * MAXIMUM DEPTH, sediment/rock: 147.685 m |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(-131.500,-131.500,-86.383,-86.383) ENVELOPE(163.755080,163.755080,-77.007580,-77.007580) |
geographic |
Cape Roberts McMurdo Sound Roberts Ridge Ross Sea Southern Ocean |
geographic_facet |
Cape Roberts McMurdo Sound Roberts Ridge Ross Sea Southern Ocean |
genre |
Antarc* Antarctica antarcticus McMurdo Sound Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica antarcticus McMurdo Sound Ross Sea Southern Ocean |
op_source |
Supplement to: Harwood, David M; Bohaty, Steven M; Scherer, Reed P (1998): Lower Miocene diatom biostratigraphy of the CRP-1 drillcore, McMurdo Sound, Antarctica. Terra Antartica, 5(3), 499-514, hdl:10013/epic.28337.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.433491 https://doi.org/10.1594/PANGAEA.433491 |
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.433491 |
_version_ |
1766253981245374464 |