(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase
Results of 40Ar-39Ar Ar dating constrain the age of the submerged volcanic succession, part of the seaward-dipping reflector sequence of the Southeast Greenland volcanic rifted margin, recovered during Leg 163. At the 63ºN drilling transect, the fully normally magnetized volcanic units at Holes 989B...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.804644 2023-05-15T16:03:48+02:00 (Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase Tegner, Christian Duncan, Robert A MEDIAN LATITUDE: 64.233167 * MEDIAN LONGITUDE: -38.184300 * SOUTH-BOUND LATITUDE: 63.472800 * WEST-BOUND LONGITUDE: -39.901900 * NORTH-BOUND LATITUDE: 65.704200 * EAST-BOUND LONGITUDE: -34.871000 * DATE/TIME START: 1995-09-08T10:00:00 * DATE/TIME END: 1995-10-01T13:00:00 * MINIMUM ELEVATION: -541.5 m * MAXIMUM ELEVATION: -262.6 m 1999-01-03 text/tab-separated-values, 133 data points https://doi.pangaea.de/10.1594/PANGAEA.804644 https://doi.org/10.1594/PANGAEA.804644 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.804644 https://doi.org/10.1594/PANGAEA.804644 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Tegner, Christian; Duncan, Robert A (1999): 40Ar-39Ar chronology for the volcanic history of the Southeast Greenland rifted margin. In: Larsen, HC; Duncan, RA; Allan, JF; Brooks, K (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 163, 1-10, https://doi.org/10.2973/odp.proc.sr.163.108.1999 163-988A 163-989B 163-990A Age 40Ar/39Ar Argon-Argon dated dated standard deviation Argon-36/Argon-40 standard deviation Argon-39 Calculated DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Greenland Sea Joides Resolution Latitude of event Leg163 Longitude of event Number Ocean Drilling Program ODP Ratio Sample code/label Sample comment Dataset 1999 ftpangaea https://doi.org/10.1594/PANGAEA.804644 https://doi.org/10.2973/odp.proc.sr.163.108.1999 2023-01-20T09:00:06Z Results of 40Ar-39Ar Ar dating constrain the age of the submerged volcanic succession, part of the seaward-dipping reflector sequence of the Southeast Greenland volcanic rifted margin, recovered during Leg 163. At the 63ºN drilling transect, the fully normally magnetized volcanic units at Holes 989B (Unit 1) and 990A (Units 1 and 2) are dated at 57.1 ± 1.3 Ma and 55.6 ± 0.6 Ma, respectively. This correlates with a common magnetochron, C25n. The underlying, reversely magnetized lavas at Hole 990A (Units 3-13) yield an average age of 55.8 ± 0.7 Ma and may correlate with C25r. The argon data, however, are also consistent with eruption of the lavas at Site 990 during the very earliest portion of C24. If so, the normally polarized units have to be correlated to a cryptochron (e.g., C24r-11 at ~55.57 Ma). The lavas at Holes 989B and 990A have typical oceanic compositions, implying that final plate separation between Greenland and northwest Europe took place at ~56 Ma. The age for Hole 989B lava is younger than expected from the seismic interpretations, posing questions about the structural evolution of the margin. An age of 49.6 ± 0.2 Ma for the basaltic lava at Site 988 (~66ºN) points to the importance of postbreakup tholeiitic magmatism at the rifted margin. Together with results from Leg 152, a virtually complete time frame for ~12 m.y. of pre-, syn-, and postbreakup volcanism during rifted margin evolution in Southeast Greenland can now be assembled. This time frame includes continental type volcanism at ~61-60 Ma, synbreakup volcanism beginning at ~57 Ma, and postbreakup volcanism at ~49.6 Ma. These discrete time windows coincide with distinct periods of tholeiitic magmatism from the onshore East Greenland Tertiary Igneous Province and is consistent with discrete mantle-melting events triggered by plume arrival (~61-60 Ma) under central Greenland, continental breakup (~57-54 Ma), and passage of the plume axis beneath the East Greenland rifted margin after breakup (~50-49 Ma), respectively. Dataset East Greenland Greenland Greenland Sea PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(-39.901900,-34.871000,65.704200,63.472800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
163-988A 163-989B 163-990A Age 40Ar/39Ar Argon-Argon dated dated standard deviation Argon-36/Argon-40 standard deviation Argon-39 Calculated DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Greenland Sea Joides Resolution Latitude of event Leg163 Longitude of event Number Ocean Drilling Program ODP Ratio Sample code/label Sample comment |
spellingShingle |
163-988A 163-989B 163-990A Age 40Ar/39Ar Argon-Argon dated dated standard deviation Argon-36/Argon-40 standard deviation Argon-39 Calculated DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Greenland Sea Joides Resolution Latitude of event Leg163 Longitude of event Number Ocean Drilling Program ODP Ratio Sample code/label Sample comment Tegner, Christian Duncan, Robert A (Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase |
topic_facet |
163-988A 163-989B 163-990A Age 40Ar/39Ar Argon-Argon dated dated standard deviation Argon-36/Argon-40 standard deviation Argon-39 Calculated DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Greenland Sea Joides Resolution Latitude of event Leg163 Longitude of event Number Ocean Drilling Program ODP Ratio Sample code/label Sample comment |
description |
Results of 40Ar-39Ar Ar dating constrain the age of the submerged volcanic succession, part of the seaward-dipping reflector sequence of the Southeast Greenland volcanic rifted margin, recovered during Leg 163. At the 63ºN drilling transect, the fully normally magnetized volcanic units at Holes 989B (Unit 1) and 990A (Units 1 and 2) are dated at 57.1 ± 1.3 Ma and 55.6 ± 0.6 Ma, respectively. This correlates with a common magnetochron, C25n. The underlying, reversely magnetized lavas at Hole 990A (Units 3-13) yield an average age of 55.8 ± 0.7 Ma and may correlate with C25r. The argon data, however, are also consistent with eruption of the lavas at Site 990 during the very earliest portion of C24. If so, the normally polarized units have to be correlated to a cryptochron (e.g., C24r-11 at ~55.57 Ma). The lavas at Holes 989B and 990A have typical oceanic compositions, implying that final plate separation between Greenland and northwest Europe took place at ~56 Ma. The age for Hole 989B lava is younger than expected from the seismic interpretations, posing questions about the structural evolution of the margin. An age of 49.6 ± 0.2 Ma for the basaltic lava at Site 988 (~66ºN) points to the importance of postbreakup tholeiitic magmatism at the rifted margin. Together with results from Leg 152, a virtually complete time frame for ~12 m.y. of pre-, syn-, and postbreakup volcanism during rifted margin evolution in Southeast Greenland can now be assembled. This time frame includes continental type volcanism at ~61-60 Ma, synbreakup volcanism beginning at ~57 Ma, and postbreakup volcanism at ~49.6 Ma. These discrete time windows coincide with distinct periods of tholeiitic magmatism from the onshore East Greenland Tertiary Igneous Province and is consistent with discrete mantle-melting events triggered by plume arrival (~61-60 Ma) under central Greenland, continental breakup (~57-54 Ma), and passage of the plume axis beneath the East Greenland rifted margin after breakup (~50-49 Ma), respectively. |
format |
Dataset |
author |
Tegner, Christian Duncan, Robert A |
author_facet |
Tegner, Christian Duncan, Robert A |
author_sort |
Tegner, Christian |
title |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase |
title_short |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase |
title_full |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase |
title_fullStr |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase |
title_full_unstemmed |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase |
title_sort |
(table 1) 40ar-39ar incremental heating ages for odp hole 163-988a basalt and plagioclase |
publisher |
PANGAEA |
publishDate |
1999 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.804644 https://doi.org/10.1594/PANGAEA.804644 |
op_coverage |
MEDIAN LATITUDE: 64.233167 * MEDIAN LONGITUDE: -38.184300 * SOUTH-BOUND LATITUDE: 63.472800 * WEST-BOUND LONGITUDE: -39.901900 * NORTH-BOUND LATITUDE: 65.704200 * EAST-BOUND LONGITUDE: -34.871000 * DATE/TIME START: 1995-09-08T10:00:00 * DATE/TIME END: 1995-10-01T13:00:00 * MINIMUM ELEVATION: -541.5 m * MAXIMUM ELEVATION: -262.6 m |
long_lat |
ENVELOPE(-39.901900,-34.871000,65.704200,63.472800) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Greenland Sea |
genre_facet |
East Greenland Greenland Greenland Sea |
op_source |
Supplement to: Tegner, Christian; Duncan, Robert A (1999): 40Ar-39Ar chronology for the volcanic history of the Southeast Greenland rifted margin. In: Larsen, HC; Duncan, RA; Allan, JF; Brooks, K (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 163, 1-10, https://doi.org/10.2973/odp.proc.sr.163.108.1999 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.804644 https://doi.org/10.1594/PANGAEA.804644 |
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.804644 https://doi.org/10.2973/odp.proc.sr.163.108.1999 |
_version_ |
1766399490850291712 |