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PESA WA: February Technical Lunch – Tectonic controls on sediment provenance in the Perth Basin

Thursday, February 21 @ 12:00 - 14:00

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Guest Speaker: Hugo Olierook

Dr. Hugo Olierook completed his PhD into the tectonic and stratigraphic evolution of the Western Australian margin. After completing his PhD in 2015, he moved to the University of Liverpool as a NERC postdoctoral research associate, looking into reservoir quality in western Europe. In November 2016, Hugo returned to Curtin University to take up a two-year postdoctoral fellowship as part of the SIEF Distal Footprints project in the Capricorn Orogen of Western Australia. Hugo is currently using his expertise in geochronology, geochemistry, tectonics and geodynamics to understand continental breakup and amalgamation processes, the causes and effects of large igneous provinces, the age and chemical signatures of mineral systems and sedimentary basin evolution.

Hosted with thanks to our Platinum sponsor:

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And with thanks to our Gold sponsors:

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PESA WA invites you to join us for our first technical luncheon of the year by Dr. Hugo Olierook.

Tectonic controls on sediment provenance in the Perth Basin from zircon U–Pb and Hf isotopes.

Presented by Dr. Hugo Olierook

Abstract:

Tectonic controls on sediment provenance in the Perth Basin from zircon U–Pb and Hf isotopes. The role of tectonics in controlling temporal and spatial variations in sediment provenance during the evolution of extensional basins from initial rifting to continental breakup and passive margin development are not well established. This talk evaluates the influence of tectonics in a rift basin that has experienced minimal uplift but significant extension throughout its history: the Perth Basin, Western Australia.

The Perth Basin has an ever-growing published zircon U–Pb and Hf isotope data from basin inception through to continental drift and this is complemented with new data from samples deposited synchronously with the continental breakup of eastern Gondwana. Three primary source regions are inferred, namely the Archean Yilgarn Craton to the east, the Paleo- and Mesoproterozoic Albany–Fraser–Wilkes Orogen to the south and east, and the Mesoproterozoic and Ediacaran–Cambrian Pinjarra Orogen underlying the rift basin and comprising the dominant crustal components to the west and southwest. From mid-Paleozoic basin inception to Early Cretaceous breakup of eastern Gondwana, drainage in the Perth Basin was primarily north- to northwest-directed as evidenced by the dominant Mesoproterozoic detrital zircon cargo, paleo drainage patterns and paleocurrent directions. Thus, provenance was primarily parallel to the rift axis and perpendicular to the extension direction, particularly during periods of thermal subsidence. During episodes of mechanical extension, detrital zircon ages are polymodal and consistently dominated by Paleo- and Mesoproterozoic grains derived from the Albany–Fraser–Wilkes Orogen, but with significantArchean and Neoproterozoic inputs from the rift margins. It is inferred that during mechanical extension the rate of subsidence exceeded sediment supply, which generated basin-margin scarps and enhanced direct input from the rift shoulders. Detrital zircon spectra from temporally-equivalent samples at the rift margin and in the rift axis reveal that distinct sedimentary routing operated on the flanks.

In summary, sediment provenance in the Perth Basin (and probably other rift basins) is tectonically controlled by (1) extension direction, (2) episodes of mechanical extension (rift) or thermal subsidence (post-rift), and (3) proximity to rift axis or rift margin.

 

Ticket Prices:

Member (Early Bird): $69.00

Concession Member (Retired, Graduate or Hardship): $59.00

Student Member (Early Bird): $39.00

Non-Member: $99.00

Early bird pricing closes Monday 18th February at 5pm (AWST).
Member (Non Early Bird): $79.00.

 

Details

Date:
Thursday, February 21
Time:
12:00 - 14:00

Venue

Parmelia HIlton
14 Mill Street, Perth, WA 6000 Australia
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Phone:
+61-8-9215-2000
Website:
http://goo.gl/J2k95s

Organizer

PESA Western Australia
Email:
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