Geology of the Earrabiddy and Landor 1: 100 000 Sheets

Sandi Occhipinti, Stephen Sheppard

Research output: Book/ReportBook

Abstract

The ERRABIDDY and LANDOR 1:100 000 sheets straddle the eastern end of the Errabiddy Shear Zone, which marks the boundary between the northwestern edge of the Archaean Yilgarn Craton and the southern margin of the Palaeoproterozoic Gascoyne Complex.
The Narryer Terrane forms the northwestern part of the Yilgarn Craton, and is mainly composed of early to late Archaean granitic gneisses intruded by late Archaean granite sheets and plutons. Numerous layers of amphibolite, metamorphosed ultramafic rock, calc-silicate gneiss, quartzite, and metamorphosed banded iron-formation are tectonically interleaved with the granitic gneisses.
On ERRABIDDY and LANDOR, the Gascoyne Complex comprises the Glenburgh Terrane, the Camel Hills Metamorphics, and granites of the Moorarie Supersuite. In this region the Glenburgh Terrane consists of meta-igneous rocks of the Dalgaringa Supersuite, comprising 2005–1985 Ma foliated and gneissic granites intruded by c. 1975 Ma tonalite and granodiorite of the Nardoo Granite. The foliated to gneissic granites were deformed and metamorphosed at medium to high grade during the Glenburgh Orogeny before intrusion of the Nardoo Granite.
High-grade metasedimentary rocks of the Camel Hills Metamorphics are confined to the Errabiddy Shear Zone. These metamorphic rocks are subdivided into the Petter Calc-silicate, which consists of calc-silicate schist and gneiss, and the Quartpot Pelite, which consists of pelitic schist and gneiss, and migmatitic pelitic gneiss. Protoliths to the Petter Calc-silicate were derived from the Archaean Yilgarn Craton, whereas the protoliths to the Quartpot Pelite were derived from a now unexposed Palaeoproterozoic terrain. The Dalgaringa Supersuite and Camel Hills Metamorphics were both deformed and metamorphosed at medium grade during the latter stage of the Glenburgh Orogeny.
The northeastern part of the Narryer Terrane was pervasively deformed and metamorphosed, and intruded by granite sheets and dykes between 1820 and 1800 Ma during the Capricorn Orogeny, and is referred to as the Yarlarweelor gneiss complex. During the same period, the Glenburgh Terrane and Camel Hills Metamorphics on LANDOR were intruded by batholithic masses of granite belonging to the Moorarie Supersuite. Also during the Capricorn Orogeny, the Gascoyne Complex was deformed and metamorphosed at low to medium grade.
Palaeoproterozoic siliciclastic sedimentary rocks of the Mount James Formation developed on top of, and are in faulted contact with, rocks of the Gascoyne Complex. The formation was probably deposited during the waning stages of the Capricorn Orogeny.
Sedimentary rocks of the latest Palaeoproterozoic to Mesoproterozoic Bangemall Supergroup rest unconformably on, or are in faulted contact with, the Gascoyne Complex. Sills of dolerite and gabbro intruded the Bangemall Supergroup at c. 1020 Ma. The Bangemall Supergroup was deformed into upright folds with easterly to southeasterly trending axes during the c. 1000 Ma Edmundian Orogeny. During this time, eastsoutheasterly trending faults that may have initially formed during the Palaeoproterozoic were reactivated and filled with quartz veins.
Original languageEnglish
Place of PublicationPerth
PublisherGeological Survey of Western Australia
Number of pages37
ISBN (Print)0 7309 6674 7
Publication statusPublished - 2000

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