Structural-metamorphic evolution of the Tia Complex, New England fold belt; thermal overprint of an accretion-subduction complex in a compressional back-arc setting

Saved in:
Online Access: Get full text
doi: 10.1016/0191-8141(92)90125-G
Authors:Dirks, Paul H. G. M.; Hand, Martin; Collins, Williams J.; Offler, Robin
Author Affiliations:Primary:
Univ. Newcastle, Dep. Geol., Newcastle, N.S.W., Australia
Volume Title:Journal of Structural Geology
Source:Journal of Structural Geology, 14(6), p.669-688. Publisher: Pergamon, Oxford-New York, International. ISSN: 0191-8141
Publication Date:1992
Note:In English. 63 refs.; illus. incl. sketch maps, 2 plates, sects.
Summary:Rocks in the Tia complex underwent a simple, clockwise P-T-t deformation path, moving from mid-crustal levels at blueschist- facies conditions (6 kbar, 200 degrees C) to upper-crustal levels at high-T amphibolite-facies conditions (2.5 kbar, 600 degrees C) in a relatively short time (approx 15 m.y.). The rocks remained under these conditions for approx 40 m.y. before they cooled and were brought to the surface. Permian rift basins were opening as thermal gradients in the Tia complex reached a maximum. The earlier deformation was associated withaccretion-subduction processes and was followed by progressively less intense, mainly compression and uplift, bringing the rocks to within 2 kbar of the surface. Limited extensional deformation was followed by final uplift along shear zones that have orientations similar to earlier thrusts. [J.M.H.]
Subjects:Accretionary wedges; Back-arc basins; Basins; Compression tectonics; Deformation; Distribution; Fold belts; Folds; Metamorphism; New England Orogeny; Overprinting; P-T conditions; Plate tectonics; Structural geology; Subduction zones; Tectonics; Tectonophysics; Australasia; Australia; New England Range; New South Wales Australia; Tia Complex
Abstract Numbers:93M/2416
Record ID:1992061985
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Tags: Add Tag
No Tags, Be the first to tag this record!
Be the first to leave a comment!
You must be logged in first