ERTH3104 Virtual Field Trip to New England Orogen
Stop name: Yarras (Gamilaroi terrane)
Location: Intersection between the Oxley Highway and Forbes River Road.
Coordinates: 31°24'54.66"S, 152°20'31.97"E
What to see: This outcrop contains tuffaceous turbidites associated with the Gamilaroi terrane. These deposits represent the forearc of the Gamilaroi intra-oceanic arc system. The beds are folded and tilted with a possible sill intrusion present. Radiolarians have also been recovered from these beds.
Additional data: A detrital zircon dateset (Click here to download the Excel data file). Hint on what to do: compare these ages with the signature age distribution of Gondwana (in the end of this page) and discuss whether there was connection between Gondwana and this unit. You would also use these data to discuss the depositional age of this sample.
(Above) Outcrop along the road at Yarras. (Photo by S. Perera) Click here to enter 360 view.
(Above) Distal tuffaceous turbidites. (Photo by Y. Chen)
Distal tuffaceous turbidites
(Photo by J. Aitchison)
Distal tuffaceous turbidites (close up)
(Photo by J. Aitchison)
An outcrop photo of tuffacous turbitites
(Photo by T. Winckle)
An outcrop photo of tuffacous turbitites
(Photo by S. Perera)
Minor faults running sub-parallel to the bedding. The small ziplock bag was used for micropaleontological sampling.
(Photo by S. Perera)
Minor faults running sub-parallel to the bedding.
(Photo by S. Perera)
(Above) Detrital zircon age compilation (over 37,000 ages) for across Gondwana (from Voice et al., 2011, The Journal of Geology). You’re given a detrital zircon age dataset for these sediment. Analyze them using IsoplotR and Excel, and plot age histogram or KDE (kernel density estimate).