An extended episode of early Mesoproterozoic metamorphic fluid flow in the Reynolds Range, central Australia

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Authors:Williams, I. S.; Buick, I. S.; Cartwright, I.
Author Affiliations:Primary:
Australian National University, Research School of Earth Sciences, Canberra, Australia
Other:
La Trobe University, Australia
Monash University, Australia
Volume Title:Journal of Metamorphic Geology
Source:Journal of Metamorphic Geology, 14(1), p.29-47. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0263-4929
Publication Date:1996
Note:In English. 64 refs.; illus., incl. 4 tables, 5 plates, geol. sketch maps
Summary:High-T early Mesoproterozoic fluid infiltration associated with low-P-high-T metamorphism of the Reynolds Range has been studied. By measuring the Pb-U-Th ages of monazite and zircon from the distinctive pegmatite and aluminous segregations in relict fluid-flow zones and from nearby country rocks it has been possible not only to distinguish between the newly formed and pre-existing mineral grains or parts of grains, but also to detect a measurable time interval between the peak of metamorphism and the waning of fluid flow, thereby assessing the total duration of a metamorphic event. The last regional high-grade metamorphism in the area occurred at ∼ 1600 m.y., not ∼ 1780 m.y. as previously thought. The ∼ 1780 m.y. separate event affected only the basement of the Reynolds range group. [R.E.S.]
Subjects:Absolute age; Dates; Facies; Fluid phase; Granulite facies; Marbles; Mesoproterozoic; Metamorphic rocks; Metamorphism; Petrography; Precambrian; Proterozoic; Retrograde metamorphism; Solutions; Thermal history; U/Th/Pb; Upper Precambrian; Arunta Block; Australasia; Australia; Northern Territory Australia; Central Australia; Reynolds Range Group
Coordinates:S260000 S200000 E1360000 E1300000
Abstract Numbers:96M/3787
Record ID:1996009539
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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