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Catacylsmic Emission Controlled by Organic Residues During Mineralisation of Upper Devonian Extinction Envrironments


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Author Heidecker EJ


Cataclysmic or flood-like release of gas-
charged brines, hydrocarbons and slurries
accompanied widespread mineralisation of Upper
Devonian environments. These are well
represented in the Canning and Burdekin Basins of
Western Australia and Queensland respectively.
The Burdekin Basin provides particularly
instructive vein structural sequences. These
fall into organic residue to carbonate
paragenetic sequences which are known elsewhere
to record progressive decarboxylation. Fibrous
veins indicate overpressure in fractures with
organic residues, acids and gas derivatives
driven to overlying groundwater flows. This
combination of large flow rates and potent
organic mineralisers led to extensive arsenical
rare-metal mineralisation which is similar to
that concentrated in Upper Devonian extinction
horizons of the Canning Basin. Organic-residue
mineralisation appears concentrated by certain
hvdrostructures and targeted upon particular
species. These controls need to be understood to
guide modern management stragegies for
mineralised organic and nitrogenous wastes.