Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1)
Gypsum grains were identified in Miocene–Pleistocene sediment cores from two deep-water ODP sites, Site 918 off the SE Greenland margin and Site 887 in the Gulf of Alaska, and in Holocene sediment cores from shallow-water localities in Disenchantment Bay and Muir Inlet in southern Alaska. Although i...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2000
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.763420 https://doi.org/10.1594/PANGAEA.763420 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.763420 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.763420 2023-05-15T13:09:49+02:00 Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) St. John, Kristen E Kudless Cowan, Ellen A MEDIAN LATITUDE: 60.052886 * MEDIAN LONGITUDE: -100.282760 * SOUTH-BOUND LATITUDE: 54.365400 * WEST-BOUND LONGITUDE: -148.446000 * NORTH-BOUND LATITUDE: 63.926130 * EAST-BOUND LONGITUDE: -38.638900 * DATE/TIME START: 1992-09-09T15:30:00 * DATE/TIME END: 1993-11-12T16:50:00 * MINIMUM DEPTH, sediment/rock: 0.13 m * MAXIMUM DEPTH, sediment/rock: 2.70 m 2000-07-26 text/tab-separated-values, 72 data points https://doi.pangaea.de/10.1594/PANGAEA.763420 https://doi.org/10.1594/PANGAEA.763420 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.763420 https://doi.org/10.1594/PANGAEA.763420 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: St. John, Kristen E Kudless; Cowan, Ellen A (2000): Terrestrial gypsum from Alaska and Greenland in glacially influenced marine sediments. Sedimentary Geology, 136(1-2), 43-58, https://doi.org/10.1016/S0037-0738(00)00083-X 145-887A 152-918A 152-918D Alaska USA Core DEPTH sediment/rock Description Disenchantment_Bay DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Greenland Sea Joides Resolution Leg145 Leg152 Muir_Inlet North Pacific Ocean Ocean Drilling Program ODP Sample code/label δ34S Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.763420 https://doi.org/10.1016/S0037-0738(00)00083-X 2023-01-20T08:52:33Z Gypsum grains were identified in Miocene–Pleistocene sediment cores from two deep-water ODP sites, Site 918 off the SE Greenland margin and Site 887 in the Gulf of Alaska, and in Holocene sediment cores from shallow-water localities in Disenchantment Bay and Muir Inlet in southern Alaska. Although initial morphologic and textural observations suggested a complex system in which the gypsum may have had more than one origin, quantitative sulfur isotope analyses of the gypsum provide evidence of its detrital nature. d34S values in gypsum from southern Alaska range between +0.0 and +7.1 per mil. Gypsum has d34S values between -27.1 and -27.5 per mil in the Gulf of Alaska and values between -28.5 and +0.2 per mil off the SE Greenland margin. All of these isotopic signatures are too highly depleted in d34S to have precipitated from seawater, present or past. In addition there is no significant change in d34S values for gypsum crystals with differing physical characteristics (abraded vs. unabraded) from the same stratigraphic horizon, suggesting all the gypsum is detrital regardless of the degree of abrasion. The isotopic and physical evidence, in combination with the onshore geology the environmental setting, and site characteristics of the gypsum-bearing marine localities, lead us to propose that the ultimate source of the gypsum is precipitation from freeze-induced terrestrial sediment or soil brines. Furthermore the combined evidence suggests that the subsequent occurrence of gypsum in glacimarine sediments results from ice-rafting (by icebergs or sea ice) of the frozen regolith and/or, in the proximal glacimarine setting of southern Alaska, very rapid burial via turbidity currents. Dataset alaska range Greenland Greenland Sea Sea ice Alaska PANGAEA - Data Publisher for Earth & Environmental Science Gulf of Alaska Greenland Pacific ENVELOPE(-148.446000,-38.638900,63.926130,54.365400) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
145-887A 152-918A 152-918D Alaska USA Core DEPTH sediment/rock Description Disenchantment_Bay DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Greenland Sea Joides Resolution Leg145 Leg152 Muir_Inlet North Pacific Ocean Ocean Drilling Program ODP Sample code/label δ34S |
spellingShingle |
145-887A 152-918A 152-918D Alaska USA Core DEPTH sediment/rock Description Disenchantment_Bay DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Greenland Sea Joides Resolution Leg145 Leg152 Muir_Inlet North Pacific Ocean Ocean Drilling Program ODP Sample code/label δ34S St. John, Kristen E Kudless Cowan, Ellen A Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) |
topic_facet |
145-887A 152-918A 152-918D Alaska USA Core DEPTH sediment/rock Description Disenchantment_Bay DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Greenland Sea Joides Resolution Leg145 Leg152 Muir_Inlet North Pacific Ocean Ocean Drilling Program ODP Sample code/label δ34S |
description |
Gypsum grains were identified in Miocene–Pleistocene sediment cores from two deep-water ODP sites, Site 918 off the SE Greenland margin and Site 887 in the Gulf of Alaska, and in Holocene sediment cores from shallow-water localities in Disenchantment Bay and Muir Inlet in southern Alaska. Although initial morphologic and textural observations suggested a complex system in which the gypsum may have had more than one origin, quantitative sulfur isotope analyses of the gypsum provide evidence of its detrital nature. d34S values in gypsum from southern Alaska range between +0.0 and +7.1 per mil. Gypsum has d34S values between -27.1 and -27.5 per mil in the Gulf of Alaska and values between -28.5 and +0.2 per mil off the SE Greenland margin. All of these isotopic signatures are too highly depleted in d34S to have precipitated from seawater, present or past. In addition there is no significant change in d34S values for gypsum crystals with differing physical characteristics (abraded vs. unabraded) from the same stratigraphic horizon, suggesting all the gypsum is detrital regardless of the degree of abrasion. The isotopic and physical evidence, in combination with the onshore geology the environmental setting, and site characteristics of the gypsum-bearing marine localities, lead us to propose that the ultimate source of the gypsum is precipitation from freeze-induced terrestrial sediment or soil brines. Furthermore the combined evidence suggests that the subsequent occurrence of gypsum in glacimarine sediments results from ice-rafting (by icebergs or sea ice) of the frozen regolith and/or, in the proximal glacimarine setting of southern Alaska, very rapid burial via turbidity currents. |
format |
Dataset |
author |
St. John, Kristen E Kudless Cowan, Ellen A |
author_facet |
St. John, Kristen E Kudless Cowan, Ellen A |
author_sort |
St. John, Kristen E Kudless |
title |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) |
title_short |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) |
title_full |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) |
title_fullStr |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) |
title_full_unstemmed |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1) |
title_sort |
sulfur-isotope analyses of gypsium samples from the southeast greenland margin, southern alaska and gulf of alaska (table 1) |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.763420 https://doi.org/10.1594/PANGAEA.763420 |
op_coverage |
MEDIAN LATITUDE: 60.052886 * MEDIAN LONGITUDE: -100.282760 * SOUTH-BOUND LATITUDE: 54.365400 * WEST-BOUND LONGITUDE: -148.446000 * NORTH-BOUND LATITUDE: 63.926130 * EAST-BOUND LONGITUDE: -38.638900 * DATE/TIME START: 1992-09-09T15:30:00 * DATE/TIME END: 1993-11-12T16:50:00 * MINIMUM DEPTH, sediment/rock: 0.13 m * MAXIMUM DEPTH, sediment/rock: 2.70 m |
long_lat |
ENVELOPE(-148.446000,-38.638900,63.926130,54.365400) |
geographic |
Gulf of Alaska Greenland Pacific |
geographic_facet |
Gulf of Alaska Greenland Pacific |
genre |
alaska range Greenland Greenland Sea Sea ice Alaska |
genre_facet |
alaska range Greenland Greenland Sea Sea ice Alaska |
op_source |
Supplement to: St. John, Kristen E Kudless; Cowan, Ellen A (2000): Terrestrial gypsum from Alaska and Greenland in glacially influenced marine sediments. Sedimentary Geology, 136(1-2), 43-58, https://doi.org/10.1016/S0037-0738(00)00083-X |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.763420 https://doi.org/10.1594/PANGAEA.763420 |
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.763420 https://doi.org/10.1016/S0037-0738(00)00083-X |
_version_ |
1766200518340771840 |