On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica
The Middle Jurassic–Lower Cretaceous Fossil Bluff Group of Alexander Island, Antarctica represents the fill of a fore‐arc basin unconformably overlying an accretionary complex. Like most fore‐arc basins, this example had been considered to have a passive origin, as a topographic hollow between the a...
Published in: | Terra Nova |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1999
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1046/j.1365-3121.1999.00244.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1999.00244.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1999.00244.x |
id |
crwiley:10.1046/j.1365-3121.1999.00244.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1046/j.1365-3121.1999.00244.x 2024-09-15T17:36:32+00:00 On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica Macdonald Leat Doubleday Kelly 1999 http://dx.doi.org/10.1046/j.1365-3121.1999.00244.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1999.00244.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1999.00244.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 11, issue 4, page 186-193 ISSN 0954-4879 1365-3121 journal-article 1999 crwiley https://doi.org/10.1046/j.1365-3121.1999.00244.x 2024-07-25T04:21:23Z The Middle Jurassic–Lower Cretaceous Fossil Bluff Group of Alexander Island, Antarctica represents the fill of a fore‐arc basin unconformably overlying an accretionary complex. Like most fore‐arc basins, this example had been considered to have a passive origin, as a topographic hollow between the arc and the trench‐slope break. Recent discoveries of igneous rock coeval with sedimentation have altered this view. Oxfordian–Kimmeridgian basaltic and rhyolitic sills and lava flows are found in a restricted area at the north of the basin, within a single formation. Chemically, most basalts are high‐Nb types, which cannot have originated in a supra‐subduction zone setting. Since the age of emplacement of these rocks coincides with a gap in the record of plutonism in the Antarctic Peninsula volcanic arc, it is concluded that a late Jurassic pause in subduction led to active rifting to form the fore‐arc basin. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Wiley Online Library Terra Nova 11 4 186 193 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The Middle Jurassic–Lower Cretaceous Fossil Bluff Group of Alexander Island, Antarctica represents the fill of a fore‐arc basin unconformably overlying an accretionary complex. Like most fore‐arc basins, this example had been considered to have a passive origin, as a topographic hollow between the arc and the trench‐slope break. Recent discoveries of igneous rock coeval with sedimentation have altered this view. Oxfordian–Kimmeridgian basaltic and rhyolitic sills and lava flows are found in a restricted area at the north of the basin, within a single formation. Chemically, most basalts are high‐Nb types, which cannot have originated in a supra‐subduction zone setting. Since the age of emplacement of these rocks coincides with a gap in the record of plutonism in the Antarctic Peninsula volcanic arc, it is concluded that a late Jurassic pause in subduction led to active rifting to form the fore‐arc basin. |
format |
Article in Journal/Newspaper |
author |
Macdonald Leat Doubleday Kelly |
spellingShingle |
Macdonald Leat Doubleday Kelly On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica |
author_facet |
Macdonald Leat Doubleday Kelly |
author_sort |
Macdonald |
title |
On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica |
title_short |
On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica |
title_full |
On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica |
title_fullStr |
On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica |
title_full_unstemmed |
On the origin of fore‐arc basins: new evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica |
title_sort |
on the origin of fore‐arc basins: new evidence of formation by rifting from the jurassic of alexander island, antarctica |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.1046/j.1365-3121.1999.00244.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1999.00244.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1999.00244.x |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica |
op_source |
Terra Nova volume 11, issue 4, page 186-193 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3121.1999.00244.x |
container_title |
Terra Nova |
container_volume |
11 |
container_issue |
4 |
container_start_page |
186 |
op_container_end_page |
193 |
_version_ |
1810490083035316224 |