Diapirism and structural thickening in an Early Palaeozoic subduction complex, southeastern New South Wales, Australia

Fergusson, C. L.; Frikken, Peter

doi:10.1016/s0191-8141(02)00017-2

Cited by 30 publications

(54 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, subduction models for the Lachlan Orogen are well supported (Collins, 2002;Fergusson and Frikken, 2003;Foster and Gray, 2000;Foster et al, 1999;Gray, 1997;Gray and Foster, 1998;Prendergast, 2007;Prendergast et al, 2011;Spaggiari et al, 2004), with subduction being active from at least 460-440 Ma. However, alternative models for the eastern margin of the Lachlan Orogen have been proposed.…”

Section: Lachlan Orogenmentioning

confidence: 85%

“…The units include chert, shale and siltstone comparable in lithology to the Narooma Chert that has been dated as ranging from Middle Cambrian to Eastonian (Late Ordovician) at Narooma (Glen et al, 2004;Fig. 2); the Bogolo Formation, consisting of chaotic clast-in-matrix mélange (Fergusson and Frikken, 2003;Gray, 1996, 1997;Prendergast, 2007); interbedded silt-and sandstone (Prendergast, 2007); and one unit of basaltic breccia and associated limestone clasts and beds that crop out at Burrewarra Point (Bischoff and Prendergast, 1987;Fig. 1b;Appendix).…”

Section: Lachlan Orogenmentioning

confidence: 99%

“…1a,b,c;Appendix;Bischoff and Prendergast, 1987;Prendergast, 2007) also occur at Batemans Bay. The disparate ages of the Wagonga Group at Batemans Bay have been interpreted to result from thrust faulting (Bischoff and Prendergast, 1987;Fergusson and Frikken, 2003;Fig. 2).…”

Section: Lachlan Orogenmentioning

confidence: 99%

“…Evidence for subduction includes (i) the juxtaposition of rocks of disparate ages across the Wagonga Group (ii) the repetition of westward younging sequences (Bischoff and Prendergast, 1987;Fergusson and Frikken, 2003), (iii) subduction related soft-sediment deformation similar to deformation documented from DSDP and ODP drill core from modern subduction zones (Prendergast, 2007), (iv) sedimentological, metamorphic and structural evidence for underplating Prendergast, 2007). Gray, 1996, 1997;Offler et al, 1998;Prendergast et al, 2011), (v) underplating to at least 15 km based on KI (Kübler Index) and b cell parameter analysis of K-white mica (Offler et al, 1998;Prendergast et al, 2011) and (vi) tectonic slices of Adaminaby Group turbidites in the Wagonga Group (Fergusson and Frikken, 2003;Prendergast, 2007).…”

Section: Lachlan Orogenmentioning

confidence: 99%

See 3 more Smart Citations

Underplated seamount in the Narooma accretionary complex, NSW, Australia

Prendergast

Offler

2012

Lithos

View full text Add to dashboard Cite

Section: Lachlan Orogenmentioning

confidence: 85%

Section: Lachlan Orogenmentioning

confidence: 99%

Section: Lachlan Orogenmentioning

confidence: 99%

Section: Lachlan Orogenmentioning

confidence: 99%

See 2 more Smart Citations

Underplated seamount in the Narooma accretionary complex, NSW, Australia

Prendergast

Offler

2012

Lithos

View full text Add to dashboard Cite

“…It has been considered that an Ordovician subduction zone, developed on the south coast of New South Wales, was related to the Macquarie Arc (Packham 1987;Miller & Gray 1996Foster & Gray 2000;Fergusson & Frikken 2003). An apparently near-continuous Middle Cambrian to Late Ordovician sedimentary succession was involved in the subduction complex on the south coast of New South Wales (Bischoff & Prendergast 1987;Glen et al 2004).…”

Section: Tectonic Evolutionmentioning

confidence: 99%

Tectonic evolution of the Ordovician Macquarie Arc, central New South Wales: arguments for subduction polarity and anticlockwise rotation

Fergusson¹

2009

Australian Journal of Earth Sciences

View full text Add to dashboard Cite

The Ordovician Macquarie Arc is most widely exposed in the Lachlan Fold Belt of central New South Wales. Complex relationships between the arc and the Ordovician turbidite mega-fan are partly explained by anticlockwise rotation of the arc during the Ordovician. Thus, initially two lobes of the mega-fan formed to the north and south of the east-west trending arc, using present-day coordinates. The arc consists of the western Goonumbla-Trangie Volcanic Belt, replacing the inappropriate term Junee-Narromine Volcanic Belt, and an eastern composite of the Molong, Rockley-Gulgong and Kiandra Volcanic Belts. These two major segments of the arc are separated by Ordovician quartz turbidites of the Kirribilli Formation and it is probable that the arc has been duplicated by a sinistral strike-slip fault. Eastonian palaeogeographic reconstruction of the eastern segment of the arc highlights a prominent limestone platform in the western Molong Volcanic Belt that grades eastwards into a realm of mainly deep-marine sedimentation and volcanic activity. By analogy with Guam in the western Pacific Ocean, the limestone platform is equated to a frontal arc ridge. This implies that the associated subduction zone was along the western side of the arc and not to the east, as in previous reconstructions. A wide zone of deformed Ordovician quartz turbidites, making up the Girilambone and Wagga-Omeo Zones west of the Macquarie Arc, is interpreted as a subduction complex that formed rapidly in the Late Ordovician. Flipping of the subduction zone was a relatively long event, inferred to have occurred during the latest Ordovician to early Silurian Benambran Orogeny. This was driven by collision of the subduction complex with northern continuations of the Stawell and Bendigo Zones, with a new west-dipping subduction zone forming to the east.

show abstract

Trace elements in quartz shed light on sediment provenance

Ackerson

Tailby

Watson

2015

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Quartz is one of the most common minerals on the surface of the earth, and is a primary rockforming mineral across the rock cycle. These two factors make quartz an obvious target for sediment provenance studies. Observations from experimental and natural samples demonstrate that the trace element content of quartz often reflects the conditions of quartz formation. When quartz is weathered from its primary crystallization setting (i.e., quartz from a granitoid) it can retain many chemical signatures of formation throughout the sedimentation processes. These geochemical signatures can be used to understand the primary source of individual quartz grains within a sediment. Here we present a case study from the Bega River catchment to demonstrate that quartz grains in sediments at the mouth of the Bega River are sourced from granitoids within the drainage basin. Data presented here also indicate that a portion of the beach sediment is also derived from either (i) sedimentary rocks within the basin or; (ii) mixing with sediments at the mouth of the river. The Bega River catchment was selected for this study because it is both small and has a wellconstrained bedrock lithology, making it an ideal location to test the utility of this provenance technique. However, quartz trace element provenance has broad applications to modern and ancient sediments and can be used in lieu of, or in conjunction with, other provenance techniques to elucidate sediment transport through time.

show abstract

Diapirism and structural thickening in an Early Palaeozoic subduction complex, southeastern New South Wales, Australia

Cited by 30 publications

References 34 publications

Underplated seamount in the Narooma accretionary complex, NSW, Australia

Underplated seamount in the Narooma accretionary complex, NSW, Australia

Tectonic evolution of the Ordovician Macquarie Arc, central New South Wales: arguments for subduction polarity and anticlockwise rotation

Trace elements in quartz shed light on sediment provenance

Contact Info

Product

Resources

About