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• W56620401 abstract "This study focuses on facies analysis, geochemistry, geochronology and tectonic significanceof the Ural Volcanics (UV) and Mount Hope Volcanics (MEV) in the Central Lachlan Orogenin New South Wales. The UV and MHV overlie non-volcanic sedimentary, below wave base,submarine facies within two intracontinental rift basins, the Rast and Mount Hope Troughs.The UV and MHV consist primarily of felsic, coherent facies and associated felsic monomicticbreccia facies. These volcanic facies are interpreted to represent submarine lava-sill complexes,which define intrabasinal, effusive, volcanic and shallow intrusive centres. The lTV include atleast 35 separate lava or sill emplacement units that amount to ~10 km3In the MHY, at least 18lavas and sills are present, and have thicknesses up to ~120 m. The combined volume of the twolargest MHV units is estimated to be <1.5 km3In the Uv, siltstone-matrix monomictic breccia facies is characterised by continuously laminatedsiltstone matrix between monomictic, non-vesicular, felsic clasts. This facies is interpreted toform from water-settled sediment deposited between lava clasts, and must therefore occur on theupper margin of a lava. The presence of conformable, continuous laminae helps to distinguishthis facies from peperite. Hence, correct identification of the siltstone-matrix monomictic brecciafacies is critical in distinguishing lavas from sills.The autoclastic facies in the UV and MHV account for up to 10% of single emplacementunits. In most cases, the clasts have blocky or slab by shapes and are flow-banded, implyingthat auto brecciation was the main fragmentation mechanism. Neither in situ or resedimentedhyaloclstite are recognised in the UV or MHY, in contrast to other submarine felsic lavas anddomes elsewhere.Pumice-rich volcaniclastic facies in the UV and MHV are less voluminous than the coherentand monomictic breccia facies. The UV pumice-rich facies are interpreted to represent felsicpyroclastic facies erupted in a single, open-vent explosive eruption from a local vent andtransported in, and deposited from, submarine gravity currents (pumice-rich facies association),and settled from suspension in the water column (fiamme-siltstone breccia facies). Similar syneruptivepyroclastic facies occur in the MHv, but their source has not been identified.Fiamme-bearing facies occur in both the UV and MHv, in fiamme-bearing pyroclastic facies andas pseudoclastic textures. Fiamme textures can also be formed in a variety of other ways. Thecommon genetic use of the term fiamme for textures produced by welding compaction is easilymisinterpreted. 'Fiamme' would be better used descriptively to mean elongate lenses or domainsof the same mineralogy, texture or composition, which define a pre-tectonic foliation, and areseparated by domains of different mineralogy, texture or composition.Results from LA-ICPMS U/Pb dating of zircons indicate that the UV and the MHV wereroughly coeval and erupted in the Late Silurian-Early Devonian, within the time period ~420-410 Ma. Both successions consist of dacites and rhyolites and have A-type to transitional I-typegeochemical affinities. High-level, felsic, A-type plutons with myrmekitic and/ or granophyrictexture occur in both study areas. Geochemistry suggests they are comagmatic with the volcanicfacies. Cross-cutting mafic to intermediate dykes and small intrusions are not co magmatic withthe felsic coherent facies.A modern analogue for the UV and lvlHV felsic has not been recognised. The closest analogueis the Late Devonian-Early Carboniferous Iberian Pyrite Belt (IPB). Parts of the IPB containsimilar felsic coherent, monomictic breccia facies, and syn-eruptive pyroclastic facies as the UVand MHV The IPB volcanic rocks are also A-type in composition. The numerous similarities ofthe IPB to the UV and MHV suggest the Australian successions have great potential for hostingvolcanic-hosted massive sulfide (VI-IMS) deposits, however, neither previous exploration normapping during this study have uncovered any VHMS-related altered zones or prospects." @default.
• W56620401 created "2016-06-24" @default.
• W56620401 creator A5074182583 @default.
• W56620401 date "2006-05-01" @default.
• W56620401 modified "2023-09-27" @default.
• W56620401 title "Facies architecture, geochemistry and tectonic signifigance of the ural volcanic and the Mount Hope volcanics, Central Lachlan Orogen,NSW" @default.
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