Deformation history and timing of granite emplacement in the Butchers Hill — Helenvale region, northern Hodgkinson Province, Queensland

Author: Davis B. K.   Henderson R. A.   Lindsay M.   Wysoczanski R.  

Publisher: Taylor & Francis Ltd

ISSN: 0812-0099

Source: Australian Journal of Earth Sciences, Vol.49, Iss.5, 2002-10, pp. : 775-785

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Abstract

Granite plutons of the Whypalla Supersuite in the Butchers Hill — Helenvale region of north Queensland were intruded into the upper crust of the Hodgkinson Formation during contractional deformation associated with the Permian‐Triassic Hunter‐Bowen Orogeny. A four‐stage structural history has been resolved for the area, with fabric overprinting relationships, porphyroblast‐matrix microstructural geometries and isotopic ages being consistent with granite emplacement during D 4 shortening at ca 274 Ma. Microstructural relationships suggest the possibility of a minor syn‐D 3 phase of granite emplacement. The deformation‐emplacement history of the Butchers Hill — Helenvale area is consistent with that recognised regionally for the Hodgkinson Province, indicating province‐wide synchronous syntectonic granite intrusion during a major phase of contractional deformation. Intense syn‐emplacement deformation partitioning was ongoing in the country rocks during progressive D 4 and was associated with upward translation of country rock from the microscale to the macroscale along D 4 cleavages and shears. Kinematic indicators show that this progressive uplift, at the scale of the area examined, was east‐side‐up.

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