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• W180273288 abstract "The Cambrian northern Central Volcanic Complex is a submarine volcanic succession within theMount Read Volcanics in western Tasmania, Australia. It comprises a relatively complex assemblageof originally glassy and crystalline, rhyolitic to basaltic, lavas, syn-volcanic intrusions and syn-eruptivevolcaniclastic facies which host massive sulfide mineralisation. Diagenesis, hydrothermal alteration,regional greenschist facies metamorphism and deformation have all modified the volcanic succession.In this study, the integration of geological mapping, volcanic facies and structural analyses, andlithogeochemistry is used to divide the northern Central Volcanic Complex jnto four distinctiveformations: the Sterling Valley Volcanics, Mount Black Formation, Kershaw Pumice Formation andthe Hercules Pumice Formation. These formations replace various informal stratigraphic units in thenorthern Central Volcanic Complex: the Sterling Valley Volcanics, Mount Black Volcanics, and theFootwall Pyroclastics and Host Rocks of the Rosebery-Hercules host sequence.The Sterling Valley Volcanics are the oldest exposed part of the northern Central VolcanicComplex. They are a thick succession (> 1.5 km thick) comprising dacitic to basaltic lavas and sills,and polymictic mafic volcaniclastic facies. The polymictic mafic volcaniclastic facies were derivedfrom the resedimentation of locally available clasts of quench brecciated basalt, dacite, pillow fragmentsand scoria. The Sterling Valley Volcanics represent the proximal to medial facies of a submarinetholeiitic basaltic volcanic centre that formed during a period of extension and back-arc basindevelopment. Intercalated calc-alkaline dacites attest to coeval tholeiitic and calc-alkaline volcanismduring formation of part of the Sterling Valley Volcanics.The Mount Black Formation (previously part of the Mount Black Volcanics) is a thick succession(>1.6 Inn) of mainly massive, flow-banded and autobrecciated felsic lavas, domes, cryptodomes andsyn-volcanic sills. It represents the proximal facies of a calc-alkaline dacitic to rhyolitic, mainly effusiveand intrusive volcanic complex.The Kershaw Pumice Formation consists of pumice-rich facies and associated rhyolitic anddacitic lavas and sills that were previously assigned to the Mount Black Volcanics. The Hercules PumiceFormation refers to the Footwall Pyroclastics and Host Rocks in the Rosebery-Hercules host sequence.The Kershaw and Hercules Pumice Formations have been correlated based on lithofacies andcompositional similarities and structural interpretation. These formations (>800 m thick) comprisesuccessions of pumice breccia, pumice-rich sandstone and shard-rich siltstone, intercalated with pumicelithicclast-rich breccia and sandstone, and rhyolitic and dacitic lavas and syn-volcanic intrusions. Thelaterally extensive pumice-rich facies are the products of a large volume (>24 km3), rhyolitic explosiveeruption and were deposited proximal to the vent from water-supported density current and suspension.Pumiceous hyaloclastite and peperite are associated with the margins of rhyolitic lavas and sills thatflowed over or intruded wet, unconsolidated pumice breccia, pumice-rich sandstone, shard-rich siltstoneand black mudstone. Pumice-lithic clast-rich breccia and sandstone were generated by resedimentationof unconsolidated felsic hyaloclastite, autobreccia and pumice-rich deposits.The Kershaw and Hercules Pumice Formations and the Mount Black Formation are interpretedto be the explosive and effusive products of a single calc-alkaline felsic volcanic centre. Tholeiiticbasalts of the Henty Dyke Swarm subsequently intruded the northern Central Volcanic Complex.These dykes are compositionally similar to tholeiitic basalts of the Sterling Valley Volcanics and suggestthat extension-related, mantle-derived magmatism was reactivated after formation of the CentralVolcanic Complex.The Hangingwall Volcaniclastics, previously considered part of the northern Central VolcanicComplex, are now correlated with the White Spur Formation and thus this unit is included in theDundas Group. This new stratigraphy for the northern Central Volcanic Complex has significantimplications for VHMS exploration in the Mount Read Volcanics. The correlation of the Kershawand Hercules Pumice Formations suggests that there is potential for the Host Rocks to the Roseberyand Hercules ore deposits (Host-rock member) to be repeated east of the Mount Black Fault.The stratigraphy of the northern Central Volcanic Complex is disrupted and repeated by Middleto Late Cambrian faults and Devonian faults and folds, resulting in substantial thickening of theCentral Volcanic Complex between Rosebery and Tullah.Metamorphosed diagenetic and hydrothermal alteration facies in the northern Central VolcanicComplex have been discriminated using a combination of alteration mineralogy, overprintingrelationships, texture, distribution, intensity and whole-rock geochemistry.Alteration facies that are interpreted to be the metamorphosed equivalents of diagenetic claysand zeolites are regionally extensive and overprinted by the regional Devonian cleavage. Althoughwidespread, locally their distributions are patchy and their intensities are variable, reflecting thecomplexity of the original volcanic textures. Thin films of sericite, carbonate and chlorite-sericitehematitereplaced clays that coated original glassy surfaces at the onset of diagenesis. Feldspar-quartzsericite,chlorhe-sericite and chlorite-sericire-hematite alteration facies replaced zeolites and clays thatfilled pore space and altered glass, prior to and synchronous with diagenetic compaction. In pumice richfacies, a bedding-parallel stylolitic foliation reflects the dissolution of glass during compaction.Fiamme are interpreted to be the product of diagenetic alteration and compaction of pumice clasts.Development of the final diagenetic alteration facies, chlorite-epidote, commenced after compactionand continued during Devonian regional metamorphism. Diagenetic alteration involved significantmineralogical and textural changes but only minor changes in composition. These changes are consistentwith the interaction of rhyolitic and basaltic glass with seawater during burial. In contrast, alterationfacies interpreted to be hydrothermal are local in distribution, cross-cut stratigraphic boundaries andinvolved significant changes in texture, mineralogy and composition.Diagenetic alteration in the northern Central Volcanic Complex was widespread, reached high temperaturediagenetic mineral assemblages (albite-quartz-sericite and chlorite-epidote) and formedthick (>2 km) alteration zones. These alteration zones reflect a high-grade diagenetic alteration systemand elevated geothermal gradient within the very thick proximal, submarine succession dominated byglassy volcanic facies." @default.
• W180273288 created "2016-06-24" @default.
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• W180273288 date "2001-02-01" @default.
• W180273288 modified "2023-09-27" @default.
• W180273288 title "Submarine volcanism and alteration in the Cambrian, northern Central Volcanic Complex, western Tasmania" @default.
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