K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35
In an attempt to establish criteria for obtaining reliable K-Ar dates, conventional K-Ar studies of several Deep Sea Drilling Project sites were undertaken. K-Ar dates of these rocks may be subject to inaccuracies as the result of sea-water alteration. Inaccuracies may also result from the presence...
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1977
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.720975 2023-05-15T13:42:09+02:00 K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 Seidemann, David E MEDIAN LATITUDE: -23.176300 * MEDIAN LONGITUDE: -82.612640 * SOUTH-BOUND LATITUDE: -63.680700 * WEST-BOUND LONGITUDE: -101.524300 * NORTH-BOUND LATITUDE: 32.862200 * EAST-BOUND LONGITUDE: -52.215300 * DATE/TIME START: 1968-11-02T00:00:00 * DATE/TIME END: 1974-03-07T00:00:00 1977-06-18 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.720975 https://doi.org/10.1594/PANGAEA.720975 en eng PANGAEA Seidemann, David E (1977): Effects of submarine alteration on K-Ar dating of deep-sea igneous rocks. Geological Society of America Bulletin, 88(11), 1660-1666, https://doi.org/10.1130/0016-7606(1977)88%3C1660:EOSAOK%3E2.0.CO;2 https://doi.pangaea.de/10.1594/PANGAEA.720975 https://doi.org/10.1594/PANGAEA.720975 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Department of Geology and Geophysics, Yale University 2-10 34-319A 34-321 35-322 35-323 Antarctic Ocean/PLAIN Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg2 Leg34 Leg35 North Atlantic/CONT RISE South Pacific/BASIN Dataset 1977 ftpangaea https://doi.org/10.1594/PANGAEA.720975 https://doi.org/10.1130/0016-7606(1977)88%3C1660:EOSAOK%3E2.0.CO;2 2023-01-20T07:31:25Z In an attempt to establish criteria for obtaining reliable K-Ar dates, conventional K-Ar studies of several Deep Sea Drilling Project sites were undertaken. K-Ar dates of these rocks may be subject to inaccuracies as the result of sea-water alteration. Inaccuracies may also result from the presence of excess radiogenic 40Ar trapped in rapidly cooled rocks at the time of their formation. The results obtained for DSDP Leg 34 basalts indicate that lowering of K-Ar dates, which is related to potassium addition by weathering, is a major cause of uncertainty in obtaining reliable K-Ar dates for deep-sea rocks. It could not be determined if the potassium addition to the basalts occurred at the time of formation, t_o, or continuously from t_o to the present. Calculations show that sediment cover is not a significant barrier to the diffusion of potassium into the basalt. 40Ar loss contributes, at least in part, to the lowering of the K-Ar date in rocks that have added potassium. The meaning of the K-Ar results obtained for DSDP Legs 35 and 2 basalts could not be unambiguously established. Because of the problems involved, caution must be used in interpreting the meaning of conventional K-Ar dates for deep-sea rocks. Dataset Antarc* Antarctic Antarctic Ocean North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Antarctic Ocean Pacific ENVELOPE(-101.524300,-52.215300,32.862200,-63.680700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
2-10 34-319A 34-321 35-322 35-323 Antarctic Ocean/PLAIN Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg2 Leg34 Leg35 North Atlantic/CONT RISE South Pacific/BASIN |
spellingShingle |
2-10 34-319A 34-321 35-322 35-323 Antarctic Ocean/PLAIN Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg2 Leg34 Leg35 North Atlantic/CONT RISE South Pacific/BASIN Seidemann, David E K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 |
topic_facet |
2-10 34-319A 34-321 35-322 35-323 Antarctic Ocean/PLAIN Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg2 Leg34 Leg35 North Atlantic/CONT RISE South Pacific/BASIN |
description |
In an attempt to establish criteria for obtaining reliable K-Ar dates, conventional K-Ar studies of several Deep Sea Drilling Project sites were undertaken. K-Ar dates of these rocks may be subject to inaccuracies as the result of sea-water alteration. Inaccuracies may also result from the presence of excess radiogenic 40Ar trapped in rapidly cooled rocks at the time of their formation. The results obtained for DSDP Leg 34 basalts indicate that lowering of K-Ar dates, which is related to potassium addition by weathering, is a major cause of uncertainty in obtaining reliable K-Ar dates for deep-sea rocks. It could not be determined if the potassium addition to the basalts occurred at the time of formation, t_o, or continuously from t_o to the present. Calculations show that sediment cover is not a significant barrier to the diffusion of potassium into the basalt. 40Ar loss contributes, at least in part, to the lowering of the K-Ar date in rocks that have added potassium. The meaning of the K-Ar results obtained for DSDP Legs 35 and 2 basalts could not be unambiguously established. Because of the problems involved, caution must be used in interpreting the meaning of conventional K-Ar dates for deep-sea rocks. |
format |
Dataset |
author |
Seidemann, David E |
author_facet |
Seidemann, David E |
author_sort |
Seidemann, David E |
title |
K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 |
title_short |
K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 |
title_full |
K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 |
title_fullStr |
K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 |
title_full_unstemmed |
K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 |
title_sort |
k-ar dating of altered deep-sea igneous rocks from dsdp legs 2, 34, and 35 |
publisher |
PANGAEA |
publishDate |
1977 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.720975 https://doi.org/10.1594/PANGAEA.720975 |
op_coverage |
MEDIAN LATITUDE: -23.176300 * MEDIAN LONGITUDE: -82.612640 * SOUTH-BOUND LATITUDE: -63.680700 * WEST-BOUND LONGITUDE: -101.524300 * NORTH-BOUND LATITUDE: 32.862200 * EAST-BOUND LONGITUDE: -52.215300 * DATE/TIME START: 1968-11-02T00:00:00 * DATE/TIME END: 1974-03-07T00:00:00 |
long_lat |
ENVELOPE(-101.524300,-52.215300,32.862200,-63.680700) |
geographic |
Antarctic Antarctic Ocean Pacific |
geographic_facet |
Antarctic Antarctic Ocean Pacific |
genre |
Antarc* Antarctic Antarctic Ocean North Atlantic |
genre_facet |
Antarc* Antarctic Antarctic Ocean North Atlantic |
op_source |
Department of Geology and Geophysics, Yale University |
op_relation |
Seidemann, David E (1977): Effects of submarine alteration on K-Ar dating of deep-sea igneous rocks. Geological Society of America Bulletin, 88(11), 1660-1666, https://doi.org/10.1130/0016-7606(1977)88%3C1660:EOSAOK%3E2.0.CO;2 https://doi.pangaea.de/10.1594/PANGAEA.720975 https://doi.org/10.1594/PANGAEA.720975 |
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.720975 https://doi.org/10.1130/0016-7606(1977)88%3C1660:EOSAOK%3E2.0.CO;2 |
_version_ |
1766163487550078976 |