From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica
We present new palynological data from the Transantarctic Mountains that clarify the timing of sedimentary and magmatic processes in the transition from continental deposition of the Beacon Supergroup to emplacement of the Ferrar Large Igneous Province. Samples were collected from twenty-three Trias...
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ftneicon:oai:rour.neicon.ru:rour/180377 2023-05-15T14:00:43+02:00 From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica Bomfleur B. Schöner R. Schneider J. Viereck L. Kerp H. McKellar J. 2014 https://openrepository.ru/article?id=180377 unknown Review of Palaeobotany and Palynology 207 18 http://rour.neicon.ru:80/xmlui/bitstream/rour/180377/1/nora.pdf 0034-6667 https://openrepository.ru/article?id=180377 SCOPUS00346667-2014-207-SID84900019026 Alisporites Beacon Supergroup Classopollis Ferrar Province Palynostratigraphy Transantarctic Mountains Article 2014 ftneicon 2020-07-21T12:00:56Z We present new palynological data from the Transantarctic Mountains that clarify the timing of sedimentary and magmatic processes in the transition from continental deposition of the Beacon Supergroup to emplacement of the Ferrar Large Igneous Province. Samples were collected from twenty-three Triassic and Jurassic sections in the southern area of north Victoria Land (NVL), East Antarctica. Recovered palynomorph assemblages are correlated with the widely used, although informal palynostratigraphic framework established for eastern Australia by Price. The associated Late Triassic-earliest Jurassic zone, APT5, is modified here with a proposed new subdivision: Lower APT5 ("APT5L"; middle-late Norian), Middle APT5 ("APT5M"; Rhaetian), and Upper APT5 ("APT5U"; Hettangian-earliest Sinemurian). We further propose a modification unifying the relevant formal eastern Australian and New Zealand palynostratigraphic zones, with a new Polycingulatisporites crenulatus Association Zone (new zonal status) that includes the P. crenulatus Association Subzone (new subzone; equivalent to APT5L) and the following Foveosporites moretonensis Association Subzone (new subzonal status; equivalent to APT5M). Our palynostratigraphic dating of the NVL assemblages demonstrates that the onset of sedimentation was diachronous in this part of the Transantarctic Basin, ranging from at least the Rhaetian to, in places, early Sinemurian. By lack of evidence for rocks containing APT5U assemblages and by analogy with the few coeval sections in Australia, we infer that the Hettangian interval in NVL is probably consumed by unconformity. Deposition of ashes from distal silicic volcanism commenced in the early Sinemurian and reached a peak phase beginning in middle Pliensbachian (ca 187. Ma), coinciding with the first major magmatic interval of the silicic Chon Aike Province in Patagonia and West Antarctica. Two major episodes of phreatomagmatic activity, driven by shallow-level sill intrusion into sandstone aquifers, occurred during the middle Pliensbachian and during the late Pliensbachian-early Toarcian. The latter episode was closely followed by the first pillow extrusion and local lava effusion. Contrary to some previous studies, we further conclude that all available palynological evidence is compatible with a short-lived emplacement of the plateau-forming Kirkpatrick Basalt at around 180. Ma during the early Toarcian. © 2014 Elsevier B.V. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Victoria Land West Antarctica NORA (National aggregator of open repositories of Russian universities) East Antarctica Patagonia West Antarctica Victoria Land Transantarctic Mountains New Zealand |
institution |
Open Polar |
collection |
NORA (National aggregator of open repositories of Russian universities) |
op_collection_id |
ftneicon |
language |
unknown |
topic |
Alisporites Beacon Supergroup Classopollis Ferrar Province Palynostratigraphy Transantarctic Mountains |
spellingShingle |
Alisporites Beacon Supergroup Classopollis Ferrar Province Palynostratigraphy Transantarctic Mountains Bomfleur B. Schöner R. Schneider J. Viereck L. Kerp H. McKellar J. From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica |
topic_facet |
Alisporites Beacon Supergroup Classopollis Ferrar Province Palynostratigraphy Transantarctic Mountains |
description |
We present new palynological data from the Transantarctic Mountains that clarify the timing of sedimentary and magmatic processes in the transition from continental deposition of the Beacon Supergroup to emplacement of the Ferrar Large Igneous Province. Samples were collected from twenty-three Triassic and Jurassic sections in the southern area of north Victoria Land (NVL), East Antarctica. Recovered palynomorph assemblages are correlated with the widely used, although informal palynostratigraphic framework established for eastern Australia by Price. The associated Late Triassic-earliest Jurassic zone, APT5, is modified here with a proposed new subdivision: Lower APT5 ("APT5L"; middle-late Norian), Middle APT5 ("APT5M"; Rhaetian), and Upper APT5 ("APT5U"; Hettangian-earliest Sinemurian). We further propose a modification unifying the relevant formal eastern Australian and New Zealand palynostratigraphic zones, with a new Polycingulatisporites crenulatus Association Zone (new zonal status) that includes the P. crenulatus Association Subzone (new subzone; equivalent to APT5L) and the following Foveosporites moretonensis Association Subzone (new subzonal status; equivalent to APT5M). Our palynostratigraphic dating of the NVL assemblages demonstrates that the onset of sedimentation was diachronous in this part of the Transantarctic Basin, ranging from at least the Rhaetian to, in places, early Sinemurian. By lack of evidence for rocks containing APT5U assemblages and by analogy with the few coeval sections in Australia, we infer that the Hettangian interval in NVL is probably consumed by unconformity. Deposition of ashes from distal silicic volcanism commenced in the early Sinemurian and reached a peak phase beginning in middle Pliensbachian (ca 187. Ma), coinciding with the first major magmatic interval of the silicic Chon Aike Province in Patagonia and West Antarctica. Two major episodes of phreatomagmatic activity, driven by shallow-level sill intrusion into sandstone aquifers, occurred during the middle Pliensbachian and during the late Pliensbachian-early Toarcian. The latter episode was closely followed by the first pillow extrusion and local lava effusion. Contrary to some previous studies, we further conclude that all available palynological evidence is compatible with a short-lived emplacement of the plateau-forming Kirkpatrick Basalt at around 180. Ma during the early Toarcian. © 2014 Elsevier B.V. |
format |
Article in Journal/Newspaper |
author |
Bomfleur B. Schöner R. Schneider J. Viereck L. Kerp H. McKellar J. |
author_facet |
Bomfleur B. Schöner R. Schneider J. Viereck L. Kerp H. McKellar J. |
author_sort |
Bomfleur B. |
title |
From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica |
title_short |
From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica |
title_full |
From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica |
title_fullStr |
From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica |
title_full_unstemmed |
From the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in East Antarctica |
title_sort |
from the transantarctic basin to the ferrar large igneous province-new palynostratigraphic age constraints for triassic-jurassic sedimentation and magmatism in east antarctica |
publishDate |
2014 |
url |
https://openrepository.ru/article?id=180377 |
geographic |
East Antarctica Patagonia West Antarctica Victoria Land Transantarctic Mountains New Zealand |
geographic_facet |
East Antarctica Patagonia West Antarctica Victoria Land Transantarctic Mountains New Zealand |
genre |
Antarc* Antarctica East Antarctica Victoria Land West Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica Victoria Land West Antarctica |
op_source |
SCOPUS00346667-2014-207-SID84900019026 |
op_relation |
Review of Palaeobotany and Palynology 207 18 http://rour.neicon.ru:80/xmlui/bitstream/rour/180377/1/nora.pdf 0034-6667 https://openrepository.ru/article?id=180377 |
_version_ |
1766270063850029056 |