Sequence and kinematics of multiple deformation around Taemas Bridge, Eastern Lachlan Fold Belt, New South Wales

Hood, D. I. A.; Durney, D. W.

doi:10.1046/j.1440-0952.2002.00916.x

Cited by 11 publications

(40 citation statements)

References 24 publications

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“…The age of crustal shortening at Taemas is poorly constrained. Possible conformable relationships between the Murrumbidgee Group and the Middle Devonian Hatchery Creek Formation, 30 km west of Taemas, indicate that regional deformation could have occurred during the Carboniferous Kanimblan Orogeny [ Hood and Durney , 2002]. …”

Section: Geological Settingmentioning

confidence: 99%

“…This inlier occurs in the footwall of a major, steeply dipping fault system (Warroo and Deakin -Devil's Pass Faults) along which the Silurian volcano-sedimentary sequence apparently has overthrust the Murrumbidgee Group to the west. The structure of the Murrumbidgee Group is controlled largely by gently plunging, upright, NNW trending folds ( Figure 3) [see also Hood and Durney, 2002]. Folds in the thinly bedded lower to middle parts of the Murrumbidgee Group predominantly have interlimb angles in the range 60°-110°, with wavelengths between 200 and 1000 m. However, thick, massive limestone sequences in the upper Taemas Formation are associated with more open, rounded, longer wavelength folds ( Figure 3).…”

Section: Geological Settingmentioning

confidence: 99%

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Structural and isotopic constraints on fluid flow regimes and fluid pathways during upper crustal deformation: An example from the Taemas area of the Lachlan Orogen, SE Australia

Cox¹

2007

J. Geophys. Res.

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[1] Structural and stable isotope studies of calcite veins and host rocks in a 1000 m thick, Devonian limestone sequence in the Taemas area of the Lachlan Orogen in SE Australia indicate that externally derived fluids migrated through the sequence over a protracted interval during folding and associated reverse faulting at temperatures of $200°C. The evolution of fluid pathways was governed by growth of fold-related and fault-related fracture networks at transiently supralithostatic fluid pressures. The internal structures of veins indicate growth during repeated cycles of permeability enhancement and sealing. Systematic increase in d 18 O of vein calcite upward through the limestone sequence, and the presence of an O isotope alteration front in the vein system, is related to buffering of fluid compositions by fluid-rock reaction during upward migration of overpressured, low d 18 O fluids. Repeated switching of fractures between highpermeability and low-permeability states promoted episodic flow and changes in flow paths during progressive deformation. A lack of significant migration of the isotopic front during the flow history is consistent with fluid-rock interaction being associated with numerous, separate pulses of fluid ascending through the percolation network. Irregular variations in fluid d 18 O with time during vein growth are interpreted to be driven by repeated changes in reactive path lengths, reaction rates, and flow rates in a discontinuous flow regime. Systematic upward changes in vein d 18 O over an area of 20 km 2 requires that on a time-averaged basis, most of the vein system was hydraulically well connected to the external fluid reservoir and that growth of the fracture network occurred by fluid-driven, invasion percolation processes. Repeated failure and sealing events in the fracture system are interpreted to have been driven by episodic migration of fluid pressure waves up through the fracture network, possibly in response to deeper level fault rupture events repeatedly breaching an overpressured fluid reservoir.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Structural and isotopic constraints on fluid flow regimes and fluid pathways during upper crustal deformation: An example from the Taemas area of the Lachlan Orogen, SE Australia

Cox¹

2007

J. Geophys. Res.

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“…Gratier, 1993;Gratier et al, 2009), and field evidence (e.g. Eyal, 1996;Grant et al, 2014;Gutiérrez-Alonso and Gross, 1999;Hood and Durney, 2002;Osborne and Swarbrick, 1999;Stricker et al, 2016a) lend strong support to the role of stress in chemical compaction. Furthermore, the driving forces behind dissolution and transport processes in the IMID model remain unclear (Sheldon et al, 2004(Sheldon et al, , 2003.…”

Section: Summary Commentsmentioning

confidence: 92%

“…Gratier, 1993;Gratier et al, 2009) and field based evidence (e.g. Eyal, 1996;Gutiérrez-Alonso and Gross, 1999;Hood and Durney, 2002;Nguyen et al, 2013;Osborne and Swarbrick, 1999) that lends strong support to the role of stress in driving chemical compaction, and is inconsistent with the IMID model (Sheldon et al, 2004).…”

Section: Chemical Compaction -A Controversial Issuementioning

confidence: 99%

Overpressure preventing quartz cementation? - A reply

Stricker

Jones

Sathar

2017

Marine and Petroleum Geology

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Overpressure preventing quartz cementation? -a replyStephan Stricker, Stuart Jones and Shanvas Sathar IntroductionWe are delighted that our recent contribution on sandstone diagenesis and reservoir quality of the Heron Cluster reservoirs, Central North Sea, UK (Stricker et al., 2016b) has raised further interest and opportunity for discussion on the role played by pore fluid overpressure during burial diagenesis (chemical compaction). Maast (2016) raised several interesting points that merit a reply following the discussion of our paper on the maintenance of reservoir quality within the Heron Cluster reservoir sandstones (Stricker et al., 2016b). We used a multidisciplinary approach comprising petrographic, SEM, fluid inclusion, and burial history modelling studies to analyse the evolution of reservoir quality in HPHT environments. We highlighted several processes which contribute to the maintenance of exceptional porosity (>30%) and reservoir quality at depth. We concluded that a combination of A) well-developed chlorite and mixed chlorite/illite grain coatings, B) shallow onset of overpressure and vertical effective stress (VES) reduction, and C) continuous overpressure maintenance (low VES) maintained reservoir quality within the fluvial channel sandstones of the Skagerrak Formation. Maast (2016), however, insists in his comment that pore fluid overpressure does not play a role and that reduced VES does not benefit the maintenance of reservoir quality. We will address this comment by not providing a recount of our petrographical observations and modelling (Stricker et al., 2016b) but will refer to further observations and analyses from the Triassic Skagerrak Formation in the North Sea (see Stricker et al., 2016a;Stricker and Jones, 2016).

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“…The Hatchery Creek Group forms part of the Goodradigbee Structural Block in the Gilgandra-Cowra-Yass Structural zone of the Lachlan Fold Belt (Scheibner & Basden 1998;Hood & Durney 2002). Owen & Wyborn (1979, pp.…”

Section: Tectonic Setting and Age Of Foldingmentioning

confidence: 99%

Depositional environment, stratigraphy, structure and paleobiology of the Hatchery Creek Group (Early–?Middle Devonian) near Wee Jasper, New South Wales

Hunt

Young

2012

Australian Journal of Earth Sciences

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Sequence and kinematics of multiple deformation around Taemas Bridge, Eastern Lachlan Fold Belt, New South Wales

Cited by 11 publications

References 24 publications

Structural and isotopic constraints on fluid flow regimes and fluid pathways during upper crustal deformation: An example from the Taemas area of the Lachlan Orogen, SE Australia

Structural and isotopic constraints on fluid flow regimes and fluid pathways during upper crustal deformation: An example from the Taemas area of the Lachlan Orogen, SE Australia

Overpressure preventing quartz cementation? - A reply

Depositional environment, stratigraphy, structure and paleobiology of the Hatchery Creek Group (Early–?Middle Devonian) near Wee Jasper, New South Wales

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