Latest Neoproterozoic to Mid-Cambrian age for the main deformation phases of the Transantarctic Mountains: new stratigraphic and isotopic constraints from the Pensacola Mountains, Antarctica

Rowell, A. J.; Van Schmus, W. R.; Storey, B. C.; Fetter, A. H.; Evans, K. R.

dc.creator	Rowell, A. J.
dc.creator	Van Schmus, W. R.
dc.creator	Storey, B. C.
dc.creator	Fetter, A. H.
dc.creator	Evans, K. R.
dc.date	2001-03
dc.date	2004-11-10T18:00:17Z
dc.date	2004-11-10T18:00:17Z
dc.date.accessioned	2022-05-18T11:15:09Z
dc.date.available	2022-05-18T11:15:09Z
dc.identifier	Rowell, AJ; Van Schmus, WR; Storey, BC; Fetter, AH; Evans, KR. Latest Neoproterozoic to Mid-Cambrian age for the main deformation phases of the Transantarctic Mountains: new stratigraphic and isotopic constraints from the Pensacola Mountains, Antarctica. JOURNAL OF THE GEOLOGICAL SOCIETY. 2001 March; 158: 295 - 308.
dc.identifier	ISI:000172853600002
dc.identifier	http://hdl.handle.net/1808/103
dc.identifier.uri	http://localhost:8080/xmlui/handle/CUHPOERS/26656
dc.description	New isotopic ages and a fresh understanding of stratigraphic relations among siliciclastic strata in the Pensacola Mountains along the northern margin of the East Antarctic craton result in removal of some constraints for the Proterozoic break-up of Rodinia and necessitate revision of the subsequent history of the East Antarctic margin. These rocks, formerly all included in the Patuxent Formation, were thought to be of mid-Neoproterozoic age, to have formed as a consequence of Rodinia rifting, and to have been deformed during a Neoproterozoic orogenic event. Our data show, in contrast, that these siliciclastic strata were deposited in two chronologically distinct basins. The older basin, in which the Hannah Ridge Formation (new name) accumulated, received sediment that contains detrital zircons of latest Neoproterozoic or Early Cambrian age. It was deformed and its contents uplifted and eroded prior to the late Mid-Cambrian in an orogenic event that we interpret as the early stage(s) of the Ross orogeny. The second basin formed later, accumulated turbidite-rich sediments of the redefined Patuxent Formation of Mid- and probably Late Cambrian age, and was subsequently deformed, possibly in Ordovician time. Review of both biostratigraphic and isotopic ages along the length of the Transantarctic Mountains indicates that almost everywhere the main episodes of deformation predate 500 Ma and are thus older than latest Mid-Cambrian, rather than Ordovician, as they are commonly considered to be. Only in the accreted Bowers and Robertson Bay terranes of northern Victoria land, which reveal no clear record of pre-latest Mid-Cambrian or older folding, is the principal episode of Ross orogenic deformation demonstrably younger than Late Cambrian.
dc.description	Journal of the Geological Society http://www.ingentaconnect.com/content/geol/jgs;jsessionid=1tcapo57fbrqv.victoria?
dc.format	426846 bytes
dc.format	application/pdf
dc.language	en_US
dc.publisher	GEOLOGICAL SOC PUBL HOUSE
dc.rights	openAccess
dc.subject	Cambrian
dc.subject	Neoproterozoic
dc.subject	Antarctica
dc.subject	Orogeny
dc.subject	Absolute age
dc.subject	Northern Victoria land
dc.subject	Robertson Bay terrane
dc.subject	Cleavage development
dc.subject	Tectonic evolution
dc.subject	Beardmore orogeny
dc.subject	East Antarctica
dc.subject	Glacier area
dc.subject	Ross orogen
dc.subject	Gondwana
dc.subject	Pb
dc.subject	http://id.worldcat.org/fast/1352218
dc.subject	http://id.worldcat.org/fast/1239992
dc.subject	http://id.worldcat.org/fast/1048386
dc.subject	http://id.worldcat.org/fast/1243627
dc.subject	http://id.worldcat.org/fast/1715447
dc.subject	Cambrian Geologic Period
dc.subject	Antarctica
dc.subject	Orogeny
dc.subject	Antarctica--East Antarctica
dc.subject	Gondwana (Continent)
dc.title	Latest Neoproterozoic to Mid-Cambrian age for the main deformation phases of the Transantarctic Mountains: new stratigraphic and isotopic constraints from the Pensacola Mountains, Antarctica
dc.type	Article