Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes
The fact that the natural remanent magnetization (NRM) intensity of mid-oceanic-ridge basalt (MORB) samples shows systematic variations as a function of age has long been recognized: maximum as well as average intensities are generally high for very young samples, falling off rather rapidly to less...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.711520 2024-09-15T17:40:26+00:00 Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes Wang, Daming Van der Voo, Rob Peacor, Donald R MEDIAN LATITUDE: 7.719000 * MEDIAN LONGITUDE: -133.902836 * SOUTH-BOUND LATITUDE: -59.262300 * WEST-BOUND LONGITUDE: 70.526000 * NORTH-BOUND LATITUDE: 63.351000 * EAST-BOUND LONGITUDE: -7.787800 * DATE/TIME START: 1972-06-16T00:00:00 * DATE/TIME END: 1990-01-04T17:20:00 2005 application/zip, 25 datasets https://doi.pangaea.de/10.1594/PANGAEA.711520 https://doi.org/10.1594/PANGAEA.711520 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.711520 https://doi.org/10.1594/PANGAEA.711520 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Wang, Daming; Van der Voo, Rob; Peacor, Donald R (2005): Why is the remanent magnetic intensity of Cretaceous MORB so much higher than that of mid to late Cenozoic MORB? Geosphere, 1(3), 138-146, https://doi.org/10.1130/GES00024.1 129-802A 24-238 26-257 27-261 28-267 29-283 34-320B 38-336 49-412A 52-418A 54-427 58-446 61-462 63-469 65-483B 67-495 72-516F 76-534A 78-543A 82-562 82-564 Antarctic Ocean/BASIN Antarctic Ocean/Tasman Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//FRACTURE ZONE Indian Ocean//PLAIN Joides Resolution Leg129 Leg24 Leg26 Leg27 Leg28 Leg29 Leg34 Leg38 Leg49 Leg52 Leg54 Leg58 Leg61 Leg63 Leg65 Leg67 Leg72 Leg76 dataset publication series 2005 ftpangaea https://doi.org/10.1594/PANGAEA.71152010.1130/GES00024.1 2024-09-03T23:52:03Z The fact that the natural remanent magnetization (NRM) intensity of mid-oceanic-ridge basalt (MORB) samples shows systematic variations as a function of age has long been recognized: maximum as well as average intensities are generally high for very young samples, falling off rather rapidly to less than half the recent values in samples between 10 and 30 Ma, whereupon they slowly rise in the early Tertiary and Cretaceous to values that approach those of the very young samples. NRM intensities measured in this study follow the same trends as those observed in previous publications. In this study, we take a statistical approach and examine whether this pattern can be explained by variations in one or more of all previously proposed mechanisms: chemical composition of the magnetic minerals, abundance of these magnetization carriers, vectorial superposition of parallel or antiparallel components of magnetization, magnetic grain or domain size patterns, low-temperature oxidation to titanomaghemite, or geomagnetic field behavior. We find that the samples do not show any compositional, petrological, rock-magnetic, or paleomagnetic patterns that can explain the trends. Geomagnetic field intensity is the only effect that cannot be directly tested on the same samples, but it shows a similar pattern as our measured NRM intensities. We therefore conclude that the geomagnetic field strength was, on-average, significantly greater during the Cretaceous than during the Oligocene and Miocene. Other/Unknown Material Antarc* Antarctic Antarctic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(70.526000,-7.787800,63.351000,-59.262300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
129-802A 24-238 26-257 27-261 28-267 29-283 34-320B 38-336 49-412A 52-418A 54-427 58-446 61-462 63-469 65-483B 67-495 72-516F 76-534A 78-543A 82-562 82-564 Antarctic Ocean/BASIN Antarctic Ocean/Tasman Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//FRACTURE ZONE Indian Ocean//PLAIN Joides Resolution Leg129 Leg24 Leg26 Leg27 Leg28 Leg29 Leg34 Leg38 Leg49 Leg52 Leg54 Leg58 Leg61 Leg63 Leg65 Leg67 Leg72 Leg76 |
spellingShingle |
129-802A 24-238 26-257 27-261 28-267 29-283 34-320B 38-336 49-412A 52-418A 54-427 58-446 61-462 63-469 65-483B 67-495 72-516F 76-534A 78-543A 82-562 82-564 Antarctic Ocean/BASIN Antarctic Ocean/Tasman Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//FRACTURE ZONE Indian Ocean//PLAIN Joides Resolution Leg129 Leg24 Leg26 Leg27 Leg28 Leg29 Leg34 Leg38 Leg49 Leg52 Leg54 Leg58 Leg61 Leg63 Leg65 Leg67 Leg72 Leg76 Wang, Daming Van der Voo, Rob Peacor, Donald R Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes |
topic_facet |
129-802A 24-238 26-257 27-261 28-267 29-283 34-320B 38-336 49-412A 52-418A 54-427 58-446 61-462 63-469 65-483B 67-495 72-516F 76-534A 78-543A 82-562 82-564 Antarctic Ocean/BASIN Antarctic Ocean/Tasman Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean//BASIN Indian Ocean//FRACTURE ZONE Indian Ocean//PLAIN Joides Resolution Leg129 Leg24 Leg26 Leg27 Leg28 Leg29 Leg34 Leg38 Leg49 Leg52 Leg54 Leg58 Leg61 Leg63 Leg65 Leg67 Leg72 Leg76 |
description |
The fact that the natural remanent magnetization (NRM) intensity of mid-oceanic-ridge basalt (MORB) samples shows systematic variations as a function of age has long been recognized: maximum as well as average intensities are generally high for very young samples, falling off rather rapidly to less than half the recent values in samples between 10 and 30 Ma, whereupon they slowly rise in the early Tertiary and Cretaceous to values that approach those of the very young samples. NRM intensities measured in this study follow the same trends as those observed in previous publications. In this study, we take a statistical approach and examine whether this pattern can be explained by variations in one or more of all previously proposed mechanisms: chemical composition of the magnetic minerals, abundance of these magnetization carriers, vectorial superposition of parallel or antiparallel components of magnetization, magnetic grain or domain size patterns, low-temperature oxidation to titanomaghemite, or geomagnetic field behavior. We find that the samples do not show any compositional, petrological, rock-magnetic, or paleomagnetic patterns that can explain the trends. Geomagnetic field intensity is the only effect that cannot be directly tested on the same samples, but it shows a similar pattern as our measured NRM intensities. We therefore conclude that the geomagnetic field strength was, on-average, significantly greater during the Cretaceous than during the Oligocene and Miocene. |
format |
Other/Unknown Material |
author |
Wang, Daming Van der Voo, Rob Peacor, Donald R |
author_facet |
Wang, Daming Van der Voo, Rob Peacor, Donald R |
author_sort |
Wang, Daming |
title |
Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes |
title_short |
Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes |
title_full |
Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes |
title_fullStr |
Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes |
title_full_unstemmed |
Magnetic properties of Cenozoic MORB and Cretaceous MORB from DSDP and ODP holes |
title_sort |
magnetic properties of cenozoic morb and cretaceous morb from dsdp and odp holes |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.711520 https://doi.org/10.1594/PANGAEA.711520 |
op_coverage |
MEDIAN LATITUDE: 7.719000 * MEDIAN LONGITUDE: -133.902836 * SOUTH-BOUND LATITUDE: -59.262300 * WEST-BOUND LONGITUDE: 70.526000 * NORTH-BOUND LATITUDE: 63.351000 * EAST-BOUND LONGITUDE: -7.787800 * DATE/TIME START: 1972-06-16T00:00:00 * DATE/TIME END: 1990-01-04T17:20:00 |
long_lat |
ENVELOPE(70.526000,-7.787800,63.351000,-59.262300) |
genre |
Antarc* Antarctic Antarctic Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean |
op_source |
Supplement to: Wang, Daming; Van der Voo, Rob; Peacor, Donald R (2005): Why is the remanent magnetic intensity of Cretaceous MORB so much higher than that of mid to late Cenozoic MORB? Geosphere, 1(3), 138-146, https://doi.org/10.1130/GES00024.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.711520 https://doi.org/10.1594/PANGAEA.711520 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71152010.1130/GES00024.1 |
_version_ |
1810486492888301568 |