Isobaric cooling of Proterozoic high-temperature metamorphites in the northern Arunta Block, central Australia; implications for tectonic evolution

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doi: 10.1016/0301-9268(88)90067-8
Authors:Warren, R. G.; Stewart, A. J.
Author Affiliations:Primary:
Bur. Miner. Resour., Canberra, Australia
Volume Title:early to middle Proterozoic of Australia
Volume Authors:Wyborn, Lesley A. I., editor; Etheridge, M. A.
Source:Precambrian Research, Vol.40-41, p.175-198; Tectonics and geochemistry of early to middle Proterozoic fold belts, Darwin, North. Territ., Australia, August, 1986, edited by Lesley A. I. Wyborn and M. A. Etheridge. Publisher: Elsevier, Amsterdam, International. ISSN: 0301-9268
Publication Date:1988
Note:In English. 60 refs.; illus. incl. 3 tables, geol. sketch maps
Summary:Protoliths of metamorphic rocks in this region include mafic and felsic igneous rocks, pelites, calcareous rocks and quartzites. Metamorphism began with a high-T, low-P stage, followed by early rehydration in higher grade areas, isobaric cooling, and late high-T, low-P hydration in and near shear zones. Downwarping took place at near-peak T, and in the near-isobaric cooling which followed, freezing of partial melts released water and biotite formed. The hydrated retrograde assemblages are zoned from NW to SE. The early high-T metamorphism is best explained by tectonic models based on extension, crustal delamination and underplating. The hydration and deformation were caused by processes unrelated to the early history occurring at least 200 m.y. later. [R.E.S.]
Subjects:Grade; High temperature; Interpretation; Low pressure; Metamorphic rocks; Metamorphism; P-T conditions; Petrology; Precambrian; Pressure; Proterozoic; Structural geology; Tectonics; Temperature; Upper Precambrian; Arunta Block; Australasia; Australia; Northern Territory Australia; Reynolds Range; Central Australia
Abstract Numbers:89M/2344
Record ID:1988079418
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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