The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica
Nunataks within an area of approximately 3 400 km2 between latitudes 71°50' and 72°35' south and longitudes 1°30' and 4°00' west were mapped geologically by the 12th South African National Antarctic Expedition during the summer of 1971-72. The area is underlain mainly by subhoriz...
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ftunivpretoria:oai:repository.up.ac.za:2263/52551 2023-05-15T14:05:19+02:00 The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica Bredell, Johannes H. 1976 http://hdl.handle.net/2263/52551 en eng University of Pretoria http://hdl.handle.net/2263/52551 Bredell, JH 1976, The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/52551> A2016 © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. UCTD Dissertation 1976 ftunivpretoria 2022-05-31T13:37:11Z Nunataks within an area of approximately 3 400 km2 between latitudes 71°50' and 72°35' south and longitudes 1°30' and 4°00' west were mapped geologically by the 12th South African National Antarctic Expedition during the summer of 1971-72. The area is underlain mainly by subhorizontal arenaceous and argillaceous sediments, extensively intruded by thick mafic sills and dykes of Precambrian age. An isolated succession comprising agglomerate, tuff and lava flows with intercalated sediments in its upper part is exposed in the east and south. A new lithostratigraphic subdivision is proposed, based on detailed investigation of field relationships combined with subsequent petrological studies and radiometric age determinations. The oldest rocks in the area belong to the Pyramiden Formation which consists mostly of feldspathic graywacke and siltstone. Correlates of this formation were discovered at Kjolrabbane, Babordsranten and at Nashornet and Viddalskollen. At the latter locality the sequence is subdivided into a Lower Member, 140 m thick, deposited under low-energy, deep-water conditions, and an Upper Member, 250 m thick, which was deposited in shallower water under higher energy conditions . The overlying Grunehogna Formation has the widest distribution of all sedimentary formations in the area and consists of alternating persistent beds of light-coloured arenite and dark-coloured argillite. This succession is conformably overlain by the H6gfonna Formation which is subdivided into a lower, Borgmassivet Member, consisting of feldspathic quartzite, shale and jasper-bearing conglomerate, and an upper, Jekselen Member which consists of calcareous, jasperbearing arenaceous sediments. All the formations mentioned above are assigned to the Ahlmannryggen Group. It is suggested that the Raudberget Formation, which is not exposed in the area investigated, is also included in this Group. The volcanic-sedimentary succession at Tindeklypa and Istind is believed to overlie the Hogfonna Formation conformably and is collectively ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica University of Pretoria: UPSpace Antarctic Grunehogna ENVELOPE(-2.750,-2.750,-72.033,-72.033) Ahlmannryggen ENVELOPE(-2.500,-2.500,-71.833,-71.833) Pyramiden ENVELOPE(-3.817,-3.817,-72.283,-72.283) Borgmassivet ENVELOPE(-3.500,-3.500,-72.667,-72.667) Babordsranten ENVELOPE(-3.433,-3.433,-72.283,-72.283) Hogfonna ENVELOPE(-3.550,-3.550,-72.750,-72.750) Kjolrabbane ENVELOPE(-3.383,-3.383,-72.267,-72.267) Nashornet ENVELOPE(-2.000,-2.000,-72.362,-72.362) Tindeklypa ENVELOPE(-2.417,-2.417,-72.083,-72.083) Viddalen ENVELOPE(-2.667,-2.667,-72.333,-72.333) Viddalskollen ENVELOPE(-2.333,-2.333,-72.433,-72.433) Jekselen ENVELOPE(-2.500,-2.500,-72.000,-72.000) Istind ENVELOPE(-2.383,-2.383,-72.100,-72.100) Raudberget ENVELOPE(-3.500,-3.500,-72.633,-72.633) |
institution |
Open Polar |
collection |
University of Pretoria: UPSpace |
op_collection_id |
ftunivpretoria |
language |
English |
topic |
UCTD |
spellingShingle |
UCTD Bredell, Johannes H. The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica |
topic_facet |
UCTD |
description |
Nunataks within an area of approximately 3 400 km2 between latitudes 71°50' and 72°35' south and longitudes 1°30' and 4°00' west were mapped geologically by the 12th South African National Antarctic Expedition during the summer of 1971-72. The area is underlain mainly by subhorizontal arenaceous and argillaceous sediments, extensively intruded by thick mafic sills and dykes of Precambrian age. An isolated succession comprising agglomerate, tuff and lava flows with intercalated sediments in its upper part is exposed in the east and south. A new lithostratigraphic subdivision is proposed, based on detailed investigation of field relationships combined with subsequent petrological studies and radiometric age determinations. The oldest rocks in the area belong to the Pyramiden Formation which consists mostly of feldspathic graywacke and siltstone. Correlates of this formation were discovered at Kjolrabbane, Babordsranten and at Nashornet and Viddalskollen. At the latter locality the sequence is subdivided into a Lower Member, 140 m thick, deposited under low-energy, deep-water conditions, and an Upper Member, 250 m thick, which was deposited in shallower water under higher energy conditions . The overlying Grunehogna Formation has the widest distribution of all sedimentary formations in the area and consists of alternating persistent beds of light-coloured arenite and dark-coloured argillite. This succession is conformably overlain by the H6gfonna Formation which is subdivided into a lower, Borgmassivet Member, consisting of feldspathic quartzite, shale and jasper-bearing conglomerate, and an upper, Jekselen Member which consists of calcareous, jasperbearing arenaceous sediments. All the formations mentioned above are assigned to the Ahlmannryggen Group. It is suggested that the Raudberget Formation, which is not exposed in the area investigated, is also included in this Group. The volcanic-sedimentary succession at Tindeklypa and Istind is believed to overlie the Hogfonna Formation conformably and is collectively ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Bredell, Johannes H. |
author_facet |
Bredell, Johannes H. |
author_sort |
Bredell, Johannes H. |
title |
The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica |
title_short |
The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica |
title_full |
The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica |
title_fullStr |
The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica |
title_full_unstemmed |
The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica |
title_sort |
ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning maud land, antarctica |
publisher |
University of Pretoria |
publishDate |
1976 |
url |
http://hdl.handle.net/2263/52551 |
long_lat |
ENVELOPE(-2.750,-2.750,-72.033,-72.033) ENVELOPE(-2.500,-2.500,-71.833,-71.833) ENVELOPE(-3.817,-3.817,-72.283,-72.283) ENVELOPE(-3.500,-3.500,-72.667,-72.667) ENVELOPE(-3.433,-3.433,-72.283,-72.283) ENVELOPE(-3.550,-3.550,-72.750,-72.750) ENVELOPE(-3.383,-3.383,-72.267,-72.267) ENVELOPE(-2.000,-2.000,-72.362,-72.362) ENVELOPE(-2.417,-2.417,-72.083,-72.083) ENVELOPE(-2.667,-2.667,-72.333,-72.333) ENVELOPE(-2.333,-2.333,-72.433,-72.433) ENVELOPE(-2.500,-2.500,-72.000,-72.000) ENVELOPE(-2.383,-2.383,-72.100,-72.100) ENVELOPE(-3.500,-3.500,-72.633,-72.633) |
geographic |
Antarctic Grunehogna Ahlmannryggen Pyramiden Borgmassivet Babordsranten Hogfonna Kjolrabbane Nashornet Tindeklypa Viddalen Viddalskollen Jekselen Istind Raudberget |
geographic_facet |
Antarctic Grunehogna Ahlmannryggen Pyramiden Borgmassivet Babordsranten Hogfonna Kjolrabbane Nashornet Tindeklypa Viddalen Viddalskollen Jekselen Istind Raudberget |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://hdl.handle.net/2263/52551 Bredell, JH 1976, The Ahlmannryggen group, the viddalen formation and the associated igneous rocks in the viddalen area, western droning Maud land, Antarctica, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/52551> A2016 |
op_rights |
© 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
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