Permo‐carboniferous silicic volcanism and palaeogeography on the western edge of the New England Orogen, north‐eastern New South Wales
作者:
J. Mcphie,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1984)
卷期:
Volume 31,
issue 1
页码: 133-146
ISSN:0812-0099
年代: 1984
DOI:10.1080/08120098408729285
出版商: Taylor & Francis Group
关键词: Permo‐Carboniferous relationships;Gunnedah Basin;New England Orogen;proximal volcanics;palaeogeography
数据来源: Taylor
摘要:
Deposition of Late Carboniferous and Early Permian continental conglomeratic strata along the western edge of the New England Orogen was continuously accompanied by silicic volcanism. Disconformable relationships exist locally between the Early PermianGlossopteris‐bearingrocks and the Late CarboniferousRhacopteris‐bearingrocks but have negligible stratigraphic significance since erosional surfaces are common within the older sequence and probably also occur in the younger sequence. The western volcanic terrain which had supplied ignimbrites, airfall deposits and volcanogenic detritus eastward during the Late Carboniferous still had some active centres in the Early Permian, though eruptions waned in scale and changed in style to include effusion of lavas. Proximal Early Permian volcanics comprised of lithic‐rich ignimbrites and lavas at Boggabri are the remnants of one such centre. After eruptions had ceased, denudation of this and other remaining centres contributed volcanogenic detritus, including ‘flint clay’ clasts, to coal measure sediments (Greta equivalent) accumulating in the flanking low‐lying areas of the incipient Gunnedah Basin. There is no evidence in support of easterly provenance for these Early Permian coal measures nor for movement on the Mooki Thrust at this time.
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