Décollement folds in Redbank area, northern territory
作者:
Emile Rod,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1978)
卷期:
Volume 25,
issue 1-2
页码: 89-95
ISSN:0016-7614
年代: 1978
DOI:10.1080/00167617808729016
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The structural deformation which produced more than 80 Jura‐type folds each of an axial length exceeding 1 km, in the Redbank Area, N.T., involved only a 360‐to 400‐m thick blanket of sediments. This thin skin of sediments and volcanic rocks, belonging to the Lower Proterozoic Tawallah Group, consists from bottom to top of the Wollogorang Formation, Gold Creek Volcanics, and Pungalina beds. Folding did not involve the underlying Settlement Creek Volcanics or Aquarium Formation. It is postulated that the cause of this detachment and shearing off along the bottom of the thin blanket of sediments is the infiltration of carbonated, K‐rich hydrothermal fluids under high pressure. This occurred during a period of igneous activity related to a postulated deep‐seated alkaline magma thought to be responsible for the many breccia pipes in the area. Thus the folds result from a décollement triggered by high fluid pressure, and from the accompanying gravity gliding and gravitational induced deformation of the thin skin of sediments along a gentle slope.
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