14 – 16 July 2020 | Perth, Western Australia

Preliminary descriptions


Pre-conference field trips

 

FT1 Pilbara Craton: evolving Archean tectonic styles (5 – 12 July 2020)

(Guides: Martin Van Kranendonk, Hugh Smithies)

A week-long trip across the beautifully-exposed Pilbara Craton, investigating two contrasting litho-stratigraphic terranes. This trip will commence with an exploration of the 3.5–3.2 Ga East Pilbara Terrane, with its classic granite dome-and-greenstone keel geometry indicative of “vertical tectonics”, and sites with traces of early life. It will then move to the western part of the craton, where we will investigate successions and structures that document a drastically different tectonic style, including an arc complex, and crustal-scale shear zones indicative of terrane accretion.

Field trip starts in Port Headland and ends in Karratha. Participants need to book their own flights arriving in Port Headland before 10:30 am on the 05/07/2020 (flight departs from Perth at 8:15 am – two flights arrive the day before) and leaving from Karratha on the 12/07/2020 (will be in Karratha around 3:00 pm – two flights leaving after that). It is recommended that participants book their flights early as seats will be limited.

Minimum number of attendees: 15

Maximum number of attendees: 18

Registration costs: AUD$ 2289.00

Note: The registration cost does not include flights.

 

FT2 Paleoproterozoic reworking of an Archean craton a transect through the southern Gawler Craton (5 – 12 July 2020)

(Guides: Rian Dutch, Stacey Curtis)

The Gawler Craton, in southern Australia, consists of an Archean granite-greenstone core surrounded by, and built upon, a series of late Archean to Paleoproterozoic volcano-sedimentary basins and intrusive suites. The region has undergone at least two major phases of deformation during the latest Archean to earliest Paleoproterozoic and now records a complex polymetamorphic history of crustal reworking. This history of pervasive Proterozoic reworking makes the Gawler Craton unique among the Archean Cratons of Australia. This field trip will begin in the relatively undeformed Archean core of the craton and will traverse towards the southern coastline of the Eyre Peninsula, where there are fantastic exposures of polydeformed granulite facies sediments of the Sleaford Complex and exposures of the crustal scale Kalinjala Shear Zone. This trip will focus on aspects of the growth of the Australian continent during the late Archean to Paleoproterozoic and the challenges of unravelling tectonic histories in multiply deformed terranes.

Field trip starts in Whyalla and ends in Port Lincoln. Participants need to book their own flights arriving in Whyalla on the 05/07/2020 and leaving from Port Lincoln on the 12/07/2020 after 5 pm (participants are expected to be back in Port Lincoln by 4 pm).

Minimum number of attendees: 12

Maximum number of attendees: 18

Registration cost: AUD$ 2697.00

Note: The registration cost does not include flights.

 


Post-conference field trips

 

FT3 The Archean-Proterozoic boundary — out with the old, in with the new (18 – 24 July 2020)

(Guides: David Martin and Heather Howard)

The title of this field trip alludes to the fact that the Archean-Proterozoic boundary has always been regarded as reflecting a fundamental change in Earth surface processes and environments, but also to the fact that the currently accepted chronometric definition is increasingly being questioned. This trip will examine the rock record of changes associated with the A-P boundary as documented in the exceptional Neoarchean to earliest Paleoproterozoic exposures of the Mount Bruce Supergroup in Western Australia. Candidates for a proposed chronostratigraphic GSSP related to the Great Oxidation Event will also be evaluated. There will also be the option to study critical drill cores in the GSWA Perth core library prior to the trip (on 17 July).

Field trip starts and ends in Paraburdoo. Participants need to book their own flights arriving in Paraburdoo before 10:00 am on the 18/07/2020 (depart from Perth at 7.30 am at the latest) and leaving from Paraburdoo on the 24/07/2020 (will be back in Paraburdoo around 3:00 pm). It is recommended that participants book their flights early as seats will be limited.

Minimum number of attendees: 12

Maximum number of attendees: 18

Registration cost: AUD$3224.00 (option with single occupancy rooms) – OR AUD$ 2727.00 (camping style accommodation).

Note: The registration cost does not include flights.

 

FT4 A traverse across the northern Yilgarn Craton in Western Australia – from the Jack Hills to the Youanmi Terrane (18 – 24 July 2020)

(Guides: Tony Kemp, Ivan Zibra)

This one-week excursion will feature a west to east traverse across the northwestern portion of the Yilgarn Craton, combining geophysical, structural, geochemical, geochronological and isotopic data to outline the tectono-magmatic and metamorphic evolution of this large remnant of Eo- to Neoarchean continental crust. The excursion will start in the western corner of the craton, in the Narryer Terrane. Rocks of the Mt Narryer and Jack Hills metasedimentary belts, which both contain Hadean (> 4000 Ma) detrital zircon crystals, will be examined, along with flanking ancient quartzofeldspathic gneisses that have protolith ages from 3730 Ma to 2750 Ma. In the Youanmi Terrane, the excursion will mainly focus on the structures developed during the c. 2730–2660 Ma Yilgarn Orogeny, with the aim of discussing the relationship between shearing, magmatism and crustal evolution from the craton scale down to the thin section scale. Highlights include the Moyagee Fault near Mount Magnet, which represents the oldest-known seismogenic fault on Earth.

Field trip starts and finishes in Perth.

Minimum number of attendees: 12

Maximum number of attendees: 20

Registration cost: AUD$ 2644.00

 

FT5 Mineral Deposits in the Yilgarn Craton (18 – 25 July 2020)

(Guides: Steffen Hagemann, Nico Thébaud)

The Yilgarn Craton has long been recognised as having world-class Au endowment. Yet the endowment varies dramatically between terranes within the craton and between constituent geological domains, showing a tendency to cluster in districts or ‘camps’. This one-week excursion will visit classic geological localities and gold deposits from the Yilgarn Craton showcasing the deposit style diversity and focusing on Au mineral system formation from regional-scale down to deposit-scale formation.

Field trip starts and finishes in Perth.

Minimum number of attendees: 8

Maximum number of attendees: 18

Registration cost: AUD$ 2202.00