(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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
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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1999
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Online Access: | https://dx.doi.org/10.1594/pangaea.804644 https://doi.pangaea.de/10.1594/PANGAEA.804644 |
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ftdatacite:10.1594/pangaea.804644 2023-05-15T16:03:51+02:00 (Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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 Tegner, Christian Duncan, Robert A 1999 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.804644 https://doi.pangaea.de/10.1594/PANGAEA.804644 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/odp.proc.sr.163.108.1999 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Event label Latitude of event Longitude of event Elevation of event Sample code/label Sample comment Argon-39 Age, dated Age, dated standard deviation Argon-36/Argon-40 Argon-36/Argon-40, standard deviation Ratio Number Drilling/drill rig DSDP/ODP/IODP sample designation Age, 40Ar/39Ar Argon-Argon Calculated Leg163 Joides Resolution Ocean Drilling Program ODP Supplementary Dataset dataset Dataset 1999 ftdatacite https://doi.org/10.1594/pangaea.804644 https://doi.org/10.2973/odp.proc.sr.163.108.1999 2022-02-08T16:24:46Z 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. : Ages are reported relative to biotite monitor FCT-3 (27.84 ± 0.12 Ma), which is calibrated against hornblende Mmhb-1 (520.4 Ma; Samson and Alexander, 1987, doi:10.1016/0168-9622(87)90025-X). Plateau ages are the mean of concordant step ages (No), weighted by the inverse of their variances. Calculations use the following decay and reactor interference constants: lambda epsilon = 0.581 x 10**-10 /yr, lambda beta = 4.963 x 10**-10 /yr; (36Ar/37Ar)Ca = 0.000264, (39Ar/37Ar)Ca = 0.000673, (40Ar/39Ar)Ca = 0.01. Dataset East Greenland Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Event label Latitude of event Longitude of event Elevation of event Sample code/label Sample comment Argon-39 Age, dated Age, dated standard deviation Argon-36/Argon-40 Argon-36/Argon-40, standard deviation Ratio Number Drilling/drill rig DSDP/ODP/IODP sample designation Age, 40Ar/39Ar Argon-Argon Calculated Leg163 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Event label Latitude of event Longitude of event Elevation of event Sample code/label Sample comment Argon-39 Age, dated Age, dated standard deviation Argon-36/Argon-40 Argon-36/Argon-40, standard deviation Ratio Number Drilling/drill rig DSDP/ODP/IODP sample designation Age, 40Ar/39Ar Argon-Argon Calculated Leg163 Joides Resolution Ocean Drilling Program ODP Tegner, Christian Duncan, Robert A (Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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 |
topic_facet |
Event label Latitude of event Longitude of event Elevation of event Sample code/label Sample comment Argon-39 Age, dated Age, dated standard deviation Argon-36/Argon-40 Argon-36/Argon-40, standard deviation Ratio Number Drilling/drill rig DSDP/ODP/IODP sample designation Age, 40Ar/39Ar Argon-Argon Calculated Leg163 Joides Resolution Ocean Drilling Program ODP |
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. : Ages are reported relative to biotite monitor FCT-3 (27.84 ± 0.12 Ma), which is calibrated against hornblende Mmhb-1 (520.4 Ma; Samson and Alexander, 1987, doi:10.1016/0168-9622(87)90025-X). Plateau ages are the mean of concordant step ages (No), weighted by the inverse of their variances. Calculations use the following decay and reactor interference constants: lambda epsilon = 0.581 x 10**-10 /yr, lambda beta = 4.963 x 10**-10 /yr; (36Ar/37Ar)Ca = 0.000264, (39Ar/37Ar)Ca = 0.000673, (40Ar/39Ar)Ca = 0.01. |
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, 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 |
title_short |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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 |
title_full |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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 |
title_fullStr |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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 |
title_full_unstemmed |
(Table 1) 40Ar-39Ar incremental heating ages for ODP Hole 163-988A basalt and plagioclase, 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 |
title_sort |
(table 1) 40ar-39ar incremental heating ages for odp hole 163-988a basalt and plagioclase, 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 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1999 |
url |
https://dx.doi.org/10.1594/pangaea.804644 https://doi.pangaea.de/10.1594/PANGAEA.804644 |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Greenland Lambda |
geographic_facet |
Greenland Lambda |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
https://dx.doi.org/10.2973/odp.proc.sr.163.108.1999 |
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.804644 https://doi.org/10.2973/odp.proc.sr.163.108.1999 |
_version_ |
1766399533107904512 |