Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1), 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
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...
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ftdatacite:10.1594/pangaea.763420 2023-05-15T13:09:48+02:00 Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1), 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 St. John, Kristen E Kudless Cowan, Ellen A 2000 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.763420 https://doi.pangaea.de/10.1594/PANGAEA.763420 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/s0037-0738(00)00083-x Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Event label Sample code/label DEPTH, sediment/rock Description δ34S Drilling/drill rig Core DSDP/ODP/IODP sample designation Leg145 Leg152 Joides Resolution Ocean Drilling Program ODP Supplementary Dataset dataset Dataset 2000 ftdatacite https://doi.org/10.1594/pangaea.763420 https://doi.org/10.1016/s0037-0738(00)00083-x 2022-02-08T16:24:46Z 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 Sea ice Alaska DataCite Metadata Store (German National Library of Science and Technology) Greenland Gulf of Alaska |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Event label Sample code/label DEPTH, sediment/rock Description δ34S Drilling/drill rig Core DSDP/ODP/IODP sample designation Leg145 Leg152 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Event label Sample code/label DEPTH, sediment/rock Description δ34S Drilling/drill rig Core DSDP/ODP/IODP sample designation Leg145 Leg152 Joides Resolution Ocean Drilling Program ODP 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), 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 |
topic_facet |
Event label Sample code/label DEPTH, sediment/rock Description δ34S Drilling/drill rig Core DSDP/ODP/IODP sample designation Leg145 Leg152 Joides Resolution Ocean Drilling Program ODP |
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), 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 |
title_short |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1), 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 |
title_full |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1), 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 |
title_fullStr |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1), 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 |
title_full_unstemmed |
Sulfur-isotope analyses of gypsium samples from the Southeast Greenland margin, southern Alaska and Gulf of Alaska (Table 1), 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 |
title_sort |
sulfur-isotope analyses of gypsium samples from the southeast greenland margin, southern alaska and gulf of alaska (table 1), 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 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2000 |
url |
https://dx.doi.org/10.1594/pangaea.763420 https://doi.pangaea.de/10.1594/PANGAEA.763420 |
geographic |
Greenland Gulf of Alaska |
geographic_facet |
Greenland Gulf of Alaska |
genre |
alaska range Greenland Sea ice Alaska |
genre_facet |
alaska range Greenland Sea ice Alaska |
op_relation |
https://dx.doi.org/10.1016/s0037-0738(00)00083-x |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.763420 https://doi.org/10.1016/s0037-0738(00)00083-x |
_version_ |
1766199463784742912 |