Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica
The Proterozoic country rock at Ahlmannryggen consists of flat lying basaltic lo andesitic lava flows and sedimentary rocks intruded by dioritic sills (Borgmassivet Intrusives). The suites display a typical platform cover. K-Ar age determinations gave maximum ages of about 1200 Ma on the magmatic ro...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1989
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.763219 https://doi.org/10.1594/PANGAEA.763219 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.763219 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.763219 2023-05-15T13:42:10+02:00 Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica Peters, Matthias Lippolt, Hans Jürgen Rittmann, Ursula Weber, Klaus MEDIAN LATITUDE: -72.550000 * MEDIAN LONGITUDE: -8.000000 * SOUTH-BOUND LATITUDE: -73.500000 * WEST-BOUND LONGITUDE: -15.000000 * NORTH-BOUND LATITUDE: -71.700000 * EAST-BOUND LONGITUDE: -1.000000 1989-07-18 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.763219 https://doi.org/10.1594/PANGAEA.763219 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.763219 https://doi.org/10.1594/PANGAEA.763219 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Peters, Matthias; Lippolt, Hans Jürgen; Rittmann, Ursula; Weber, Klaus (1989): Field relations, petrography and K-Ar Age determinations on Magmatic Rocks from Neuschwabenland, Antarctica. Polarforschung, 59(1/2), 35-44, hdl:10013/epic.29631.d001 Ahlmannryggen Neuschwabenland Antarctica Vestfjella Kraul Mountains Dataset 1989 ftpangaea https://doi.org/10.1594/PANGAEA.763219 2023-01-20T07:32:14Z The Proterozoic country rock at Ahlmannryggen consists of flat lying basaltic lo andesitic lava flows and sedimentary rocks intruded by dioritic sills (Borgmassivet Intrusives). The suites display a typical platform cover. K-Ar age determinations gave maximum ages of about 1200 Ma on the magmatic rocks. All these suites were intruded bv Proterozoic dikes dated also at about 1200 Ma. Localiy the Proterozoic rocks have a slaty cleavage grading into mylonitic texture which strike parallel to the Jutul Penck graben. Such tectonic structures were dated at 525 Ma using syntectonic white micas. Evidence of the break-up of Gondwana during the Early Jurassic/Triassic is given by dikes at Ahlmannryggen and lava flows, dikes and sills at Vestfjella. At Ahlmannryggen the initial rift phase is documented by the development of the Jutul Penck graben and the intrusion of the 200-250 Ma continental-tholeiitic dikes striking parallel to the graben axis. The lava flows, dikes and sills at Vestfjella represent a later stage of the Gondwana break-up at about 180 Ma that probably reflects the initial stage of the opening of the Weddell Sea. Dataset Antarc* Antarctica Polarforschung Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Weddell Sea Weddell Neuschwabenland ENVELOPE(5.000,5.000,-72.000,-72.000) Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) Ahlmannryggen ENVELOPE(-2.500,-2.500,-71.833,-71.833) Borgmassivet ENVELOPE(-3.500,-3.500,-72.667,-72.667) Penck ENVELOPE(87.717,87.717,-66.700,-66.700) Jutul ENVELOPE(26.337,26.337,70.677,70.677) Kraul Mountains ENVELOPE(-14.167,-14.167,-73.333,-73.333) ENVELOPE(-15.000000,-1.000000,-71.700000,-73.500000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ahlmannryggen Neuschwabenland Antarctica Vestfjella Kraul Mountains |
spellingShingle |
Ahlmannryggen Neuschwabenland Antarctica Vestfjella Kraul Mountains Peters, Matthias Lippolt, Hans Jürgen Rittmann, Ursula Weber, Klaus Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica |
topic_facet |
Ahlmannryggen Neuschwabenland Antarctica Vestfjella Kraul Mountains |
description |
The Proterozoic country rock at Ahlmannryggen consists of flat lying basaltic lo andesitic lava flows and sedimentary rocks intruded by dioritic sills (Borgmassivet Intrusives). The suites display a typical platform cover. K-Ar age determinations gave maximum ages of about 1200 Ma on the magmatic rocks. All these suites were intruded bv Proterozoic dikes dated also at about 1200 Ma. Localiy the Proterozoic rocks have a slaty cleavage grading into mylonitic texture which strike parallel to the Jutul Penck graben. Such tectonic structures were dated at 525 Ma using syntectonic white micas. Evidence of the break-up of Gondwana during the Early Jurassic/Triassic is given by dikes at Ahlmannryggen and lava flows, dikes and sills at Vestfjella. At Ahlmannryggen the initial rift phase is documented by the development of the Jutul Penck graben and the intrusion of the 200-250 Ma continental-tholeiitic dikes striking parallel to the graben axis. The lava flows, dikes and sills at Vestfjella represent a later stage of the Gondwana break-up at about 180 Ma that probably reflects the initial stage of the opening of the Weddell Sea. |
format |
Dataset |
author |
Peters, Matthias Lippolt, Hans Jürgen Rittmann, Ursula Weber, Klaus |
author_facet |
Peters, Matthias Lippolt, Hans Jürgen Rittmann, Ursula Weber, Klaus |
author_sort |
Peters, Matthias |
title |
Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica |
title_short |
Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica |
title_full |
Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica |
title_fullStr |
Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica |
title_full_unstemmed |
Age determinations of rocks from Vestfjella and Ahlmannryggen in Antarctica |
title_sort |
age determinations of rocks from vestfjella and ahlmannryggen in antarctica |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.763219 https://doi.org/10.1594/PANGAEA.763219 |
op_coverage |
MEDIAN LATITUDE: -72.550000 * MEDIAN LONGITUDE: -8.000000 * SOUTH-BOUND LATITUDE: -73.500000 * WEST-BOUND LONGITUDE: -15.000000 * NORTH-BOUND LATITUDE: -71.700000 * EAST-BOUND LONGITUDE: -1.000000 |
long_lat |
ENVELOPE(5.000,5.000,-72.000,-72.000) ENVELOPE(-14.000,-14.000,-73.167,-73.167) ENVELOPE(-2.500,-2.500,-71.833,-71.833) ENVELOPE(-3.500,-3.500,-72.667,-72.667) ENVELOPE(87.717,87.717,-66.700,-66.700) ENVELOPE(26.337,26.337,70.677,70.677) ENVELOPE(-14.167,-14.167,-73.333,-73.333) ENVELOPE(-15.000000,-1.000000,-71.700000,-73.500000) |
geographic |
Weddell Sea Weddell Neuschwabenland Vestfjella Ahlmannryggen Borgmassivet Penck Jutul Kraul Mountains |
geographic_facet |
Weddell Sea Weddell Neuschwabenland Vestfjella Ahlmannryggen Borgmassivet Penck Jutul Kraul Mountains |
genre |
Antarc* Antarctica Polarforschung Weddell Sea |
genre_facet |
Antarc* Antarctica Polarforschung Weddell Sea |
op_source |
Supplement to: Peters, Matthias; Lippolt, Hans Jürgen; Rittmann, Ursula; Weber, Klaus (1989): Field relations, petrography and K-Ar Age determinations on Magmatic Rocks from Neuschwabenland, Antarctica. Polarforschung, 59(1/2), 35-44, hdl:10013/epic.29631.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.763219 https://doi.org/10.1594/PANGAEA.763219 |
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.763219 |
_version_ |
1766164086018539520 |