Ordovician turbidites of the Hotham Group, eastern Victoria: Sedimentation in deep-marine channel-levee complexes

Fergusson, C. L.; Cas, Ray; Stewart, Ian

doi:10.1080/14400958985270021

Cited by 3 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the SW of the terrane, 80 flute marks indicate ENE to ESE paleocurrent directions [ Fergusson et al , 1989], excluding 51 measurements now known to be from Early Silurian strata. Paleocurrent data from east of the Macquarie Arc consist of small data sets of NE to east flowing currents (with a lesser population to the north) mainly from flute marks [e.g., Cas et al , 1980; Powell , 1984; Fergusson and Colquhoun , 1996; Simpson et al , 1997] as well as 208 NE and east directed paleocurrents from cross laminations in “proximal” turbidites and 199 NE and SE directed paleocurrents from cross laminations in “distal” turbidites [ Powell , 1984].…”

Section: Ordovician Tectonostratigraphic Terranes In the Lachlan Orogenmentioning

confidence: 99%

Ordovician continental margin terranes in the Lachlan Orogen, Australia: Implications for tectonics in an accretionary orogen along the east Gondwana margin

Glen¹,

Percival

Quinn

2009

Tectonics

View full text Add to dashboard Cite

Four continental margin turbidite ± black shale terranes of the Lachlan Orogen in the southern Tasmanides of eastern Australia formed in two major systems along the east Gondwana margin and constrain the Ordovician assembly of this accretionary orogen. Key features are the dissimilar stratigraphies of the adjacent Bendigo and Melbourne terranes in the western system; the dissimilar stratigraphies of the adjacent Melbourne and Albury‐Bega terranes that reflect juxtaposition of the two systems during the Middle Devonian, and the presence of the Albury‐Bega Terrane both west and east of the Macquarie Arc in the eastern system that also includes the ocean floor Narooma Terrane and igneous ocean crust terrane(s). Repetition of the Albury‐Bega Terrane either side of the arc requires either rifting or orogen‐parallel, strike‐slip duplication of a once contiguous package. Terrane interactions began in the earliest Gisbornian with early docking, uplift, deformation, and exchange of detritus. Amalgamation occurred in the earliest Silurian Benambran Orogeny with accretion in the Middle Devonian. Over 40 Myr, discrete turbidite terranes aligned along the Gondwana margin in two systems were converted into a very wide orogen characterized by the along‐strike juxtaposition of superficially similar terranes.

show abstract

Section: Ordovician Tectonostratigraphic Terranes In the Lachlan Orogenmentioning

confidence: 99%

Ordovician continental margin terranes in the Lachlan Orogen, Australia: Implications for tectonics in an accretionary orogen along the east Gondwana margin

Glen¹,

Percival

Quinn

2009

Tectonics

View full text Add to dashboard Cite

show abstract

“…Subsequent lithofacies approaches by Powell and coworkers, Fergusson and coworkers, Glen, and VandenBerg and Stewart (Powell 1984a; Glen & VandenBerg 1987; Fergusson et al. 1989; Glen 1992; VandenBerg & Stewart 1992; Fergusson & VandenBerg 2003) have led to a generalised stratigraphy for the central Lachlan Orogen and southeastern Lachlan Orogen, of Cambrian mafic volcanics, overlain by bedded chert, overlain by Lower to Middle Ordovician turbidites with abundant sandstone (Adaminaby Group) and incorporating a thin‐bedded chert unit (Numerella Chert) in the easternmost parts, overlain by mudstone dominant turbidites (Sunlight Creek Formation), overlain by Upper Ordovician black shale (Warbisco Shale; Fergusson & Fanning 2002 figure 2).…”

Section: Review Of Approaches To Eastern Australia Tectonic Evolutionmentioning

confidence: 99%

“…Using a similar approach, the Ordovician sequences of Victoria were investigated in the Bendigo Zone in central Victoria by Cas and coworkers (Cas and VandenBerg 1988), and in the Ordovician–Silurian sequences of the Tabberabbera Zone (Fergusson et al . 1989).…”

Section: Review Of Approaches To Eastern Australia Tectonic Evolutionmentioning

confidence: 99%

See 1 more Smart Citation

Tectonic evolution of the Lachlan Orogen, southeast Australia: historical review, data synthesis and modern perspectives

2004

View full text Add to dashboard Cite

The Lachlan Orogen, like many other orogenic belts, has undergone paradigm shifts from geosynclinal to plate-tectonic theory of evolution over the past 40 years. Initial plate-tectonic interpretations were based on lithologic associations and recognition of key plate-tectonic elements such as andesites and palaeo-subduction complexes. Understanding and knowledge of modern plate settings led to the application of actualistic models and the development of palaeogeographical reconstructions, commonly using a non-palinspastic base. Igneous petrology and geochemistry led to characterisation of granite types into 'I' and 'S', the delineation of granite basement terranes, and to nonmobilistic tectonic scenarios involving plumes as a heat source to drive crustal melting and lithospheric deformation. More recently, measurements of isotopic tracers (Nd, Sr, Pb) and U-Pb SHRIMP age determinations on inherited zircons from granitoids and detrital zircons from sedimentary successions led to the development of multiple component mixing models to explain granite geochemistry. These have focused tectonic arguments for magma genesis again more on plate interactions. The recognition of fault zones in the turbidites, their polydeformed character and their thin-skinned nature, as well as belts of distinct tectonic vergence has led to a major reassessment of tectonic development. Other geochemical studies on Cambrian metavolcanic belts showed that the basement was partly backarc basin-and forearc basin-type oceanic crust. The application of 40 Ar-39 Ar geochronology and thermochronology on slates, schist and granitoids has better constrained the timing of deformation and plutonism, and illite crystallinity and b o mica spacing studies on slates have better defined the background metamorphic conditions in the low-grade parts. The Lachlan deformation pattern involves three thrust systems that constitute the western Lachlan Orogen, central Lachlan Orogen and eastern Lachlan Orogen. The faults in the western Lachlan Orogen show a generalised east-younging (450-395 Ma), which probably relates to imbrication and rock uplift of the sediment wedge, because detailed analyses show that the décollement system is as old in the east as it is in the west. Overall, deformation in the eastern Lachlan Orogen is younger (400-380 Ma), apart from the Narooma Accretionary Complex ( ca 445 Ma). Preservation of extensional basins and evidence for basin inversion are largely restricted to the central and eastern parts of the Lachlan Orogen. The presence of dismembered ophiolite slivers along some major fault zones, as well as the recognition of relict blueschist metamorphism and serpentinite-matrix mélanges requires an oceanic setting involving oceanic underthrusting (subduction) for the western Lachlan Orogen and central Lachlan Orogen for parts of their history. Inhibited by deep weathering and a general lack of exposure, the recent application of geophysical techniques including gravity, aeromagnetic imaging and deep crustal seismic reflection profiling ...

show abstract

“…Terminal Delamerian exhumation exposed and eroded the syntectonic metamorphic and igneous complexes that the A-type granites and volcanics intruded at high crustal level. 40 Ar-39 Ar dating of detrital micas from the dominantly Ordovician flysch (Cas 1983;Fergusson et al 1989) in the Lachlan Fold Belt reveal that these have Late Delamerian ages of very limited range. This indicates that the eroding terrain was being very rapidly exhumed through the 350Њ-450ЊC Ar-muscovite/ biotite closure temperature .…”

mentioning

confidence: 99%

The Timing and Duration of the Delamerian Orogeny: Correlation with the Ross Orogen and Implications for Gondwana Assembly

Foden¹,

Elburg²,

Dougherty-Page³

et al. 2006

The Journal of Geology

327

198

View full text Add to dashboard Cite

Ordovician turbidites of the Hotham Group, eastern Victoria: Sedimentation in deep-marine channel-levee complexes

Cited by 3 publications

References 0 publications

Ordovician continental margin terranes in the Lachlan Orogen, Australia: Implications for tectonics in an accretionary orogen along the east Gondwana margin

Ordovician continental margin terranes in the Lachlan Orogen, Australia: Implications for tectonics in an accretionary orogen along the east Gondwana margin

Tectonic evolution of the Lachlan Orogen, southeast Australia: historical review, data synthesis and modern perspectives

The Timing and Duration of the Delamerian Orogeny: Correlation with the Ross Orogen and Implications for Gondwana Assembly

Contact Info

Product

Resources

About