The history of movement on the Henty Fault Zone, western Tasmania: An analysis of fault striations

Berry, Ron F.

doi:10.1080/08120098908729481

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…The lithostratigraphy of the Mount Read Volcanics is disrupted by a major Cambrian fault zone, the Henty Fault ( Fig. 1) (Berry, 1989), and the succession has been faulted and folded mainly during the Early to Middle Devonian (Corbett and Lees, 1987;Crawford and Berry, 1992). Regional metamorphism to greenschist facies accompanied Devonian deformation (Green et al, 1981;Walshe and Solomon, 1981;Corbett and Solomon, 1989).…”

Section: Geological Settingmentioning

confidence: 99%

Pumiceous rhyolitic peperite in ancient submarine volcanic successions

Gifkins

McPhie

Allen

2002

Journal of Volcanology and Geothermal Research

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Pumiceous peperite is associated with a rhyolitic sill that intruded wet, unconsolidated, submarine stratified pumice breccia in the Cambrian Mount Read Volcanics, Australia. Other examples of pumiceous peperite described in this paper occur at the pumiceous base of a rhyolitic lava and the margins of a rhyolitic cryptodome complex in the Miocene Green Tuff Belt, Japan. Intervals of pumiceous peperite are thin ( 6 15 m), laterally discontinuous, massive, poorly sorted and the clast-to-matrix ratio varies significantly over short distances. They are composed of feldsparphyric tube pumice clasts and domains of clastic sediment that include stratified pumice breccia, pumiceous siltstone and bioturbated mudstone. The sediment domains may be massive or may display relic depositional structures. Sediment adjacent to pumice clasts is silicified, possibly reflecting induration on contact with hot pumice. Pumiceous peperite has gradational contacts with in situ and clast-rotated pumiceous hyaloclastite and coherent pumiceous rhyolite. Gradational relationships between pumiceous peperite and coherent pumiceous rhyolite, pumice clasts with chilled margins and curviplanar surfaces, and abundant jigsaw-fit texture imply that quench fragmentation and autobrecciation were the dominant mechanisms of clast formation. The formation of pumiceous peperite is favoured by a combination of low confining pressure and delayed quenching allowing vesiculation. Pumiceous peperite may easily be misinterpreted or overlooked as it resembles other pumice-rich facies that are common in submarine volcanic successions. The correct identification of pumiceous peperite can provide evidence to constrain the timing of intrusive episodes in volcanic successions. ß

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Section: Geological Settingmentioning

confidence: 99%

Pumiceous rhyolitic peperite in ancient submarine volcanic successions

Gifkins

McPhie

Allen

2002

Journal of Volcanology and Geothermal Research

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“…Several methods of fault plane striations analysis have been recently proposed for determining the axes of paleostress and deduce the directions and magnitude of the principal stress at the time faulting [20], [21] and [22]. Many authors [15], [16], [17], [18] and [23] have applied the reactivated fault model to estimate the magnitude of stresses.…”

Section: -Methodologymentioning

confidence: 99%

“…For continental rocks, which have an vertical stress (σv) is close to the cap rock. Therefore, the vertical stress is given by: [21], [22] and [27].…”

Section: : Determination Of the Paleostress Magnitudes Using Mohr Diagrammentioning

confidence: 99%

Determination of the Paleostress Orientations and Magnitudes for Missan Structures, Southeastern Iraq

Hachem

Obaidi

2018

JUBPAS

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The use of Right dihedral method and Mohr diagram method allow determination of the paleostress orientation and its magnitude in Missan structures, Southeastern Iraq. The principal stress orientations and its magnitudes have been determined by the measure of the striation on the faults planes. The measurement of orientation of the principal stress was deduced by different graphical methods, the horizontal maximum principal stresses (?1) magnitudes were (3600, 4360,4650, 4750 and 5700) bars, the horizontal intermediate principal stresses (?2) magnitudes were (1528, 1842,1962.5, 1998.5 and 2390.5) bars and the vertical minimum principal stresses (?3) magnitudes were (544, 676,725, 753 and 919) bars. This study shows that area is located within the unstable region since the poles of measured faults lie in the area of reactivated faults in Mohr diagram.

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“…The Cambrian and Ordovician sequences were folded during Mid-Palaeozoic deformation, and these fold structures have been intruded by Devonian granite. Post-granite emplacement faulting includes dextral and thrust faults with small displacements [32].…”

Section: Deposit Geologymentioning

confidence: 99%

Computed Tomography of Scheelite Ore, Kara, Australia: Morphological Characterisation and Modal Mineralogy

Krebbers,

Hunt,

Lottermoser

2024

Minerals

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Metal ores are mineralogically characterised to understand their genesis in order to allow informed decisions on mineral processing and to recognise likely environmental risks upon mining. However, standard mineralogical techniques generate only two-dimensional information at best, which in addition may be subject to sampling and stereological errors. By contrast, computed tomography (CT) is a non-destructive imaging technique that allows three-dimensional analysis of solid materials. In the present study, two ore types of the Kara Fe-W deposit (Australia) were characterised using CT to examine their mineral texture and modal mineralogy as well as scheelite distribution and ore grade (WO3). The results show that scheelite is primarily associated with hydrous phases (e.g., epidote, chlorite, amphibole) and occurs as massive or disseminated mineral as well as vein-fill at minor and trace concentrations. This study demonstrates that CT of scheelite ore enables accurate 3D texture visualisation (volume, grain size distribution) and yields valid quantitative data on modal mineralogy and WO3 grade of individual ore samples. Consequently, CT analysis of scheelite-bearing ore provides information relevant for ore genesis studies and comminution strategies for the possible recovery of scheelite as a by-product from metalliferous ores.

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The history of movement on the Henty Fault Zone, western Tasmania: An analysis of fault striations

Cited by 9 publications

References 21 publications

Pumiceous rhyolitic peperite in ancient submarine volcanic successions

Pumiceous rhyolitic peperite in ancient submarine volcanic successions

Determination of the Paleostress Orientations and Magnitudes for Missan Structures, Southeastern Iraq

Computed Tomography of Scheelite Ore, Kara, Australia: Morphological Characterisation and Modal Mineralogy

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