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- W1593014734 abstract "A study of the petrology, geochemistry and field relationships ofsedimentary, volcanic and plutonic rocks from the Yeoval district hasrevealed a complex and varied geological history. Volcanics derived fromthe nearby Molong Volcanic Rise were deposited with marine sediments in theMiddle to Late Silurian. They were then deformed during the BowningOrogeny.Intrusion of the Naringla Monzodiorite occurred in the Early Devonian.This is a heterogeneous body ranging in composition from pyroxenitecumulates to microgranodiorite and dacite porphyry. The latter two rocktypes areCo-geneticprior topyroxeneformed bythe host to disseminated porphyry copper style mineralisation.basaltic andesites were erupted above the monzodiorite bodyfinal crystallization of the monzodiorite. The pyroxenites,bearing basaltic andesites and pyroxenecrystal fractionation of augite frombearing monzodioritesa primitive magma ofbasaltic andesite composition. The chemical variations in the NaringlaMonzodiorite (apart from the low-Si rocks) is thought to have been derivedby chemical fractionation of hornblende, plagioclase and possibly biotite,although magma mixing and restite unmixing cannot be ruled out as formationprocesses.Hydrothermal alteration associated with the porpyritic intrusions hasproduced propylitic mineral assemblages in most of the rocks of theNaringla Monzodiorite. Alteration is most intense around the copperdeposits, and occasional albitic alteration is developed. Alteration is ofa weak and patch nature, and lateration zones are generally not developed.A small body of gabbro that outcrops adjacent to the NaringlaMonzodiorite is probably unrelated due to chemical inconsistencies betweenthe two units.The Ohley Adamellite intruded during the Middle Devonian, and contactmetamorphosed the gabbro and a body of quartz-hornblende-diorite. Theintrusion of rhyolite dykes into the Naringla Monzodiorite may have beenrelated to the emplacement of the adamellite.The final geological event in the area was the emplacement of smallbasic dykes along east-west joints in the Naringla Monzodiorite.dykes are of probable Tertiary age." @default.
- W1593014734 created "2016-06-24" @default.
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- W1593014734 date "1985-01-01" @default.
- W1593014734 modified "2023-09-27" @default.
- W1593014734 title "The geology and geochemistry of theNaringla Monzodiorite, and themineralization and alteration of theassociated Porphyry Copper Deposits,Yeoval, Central-Western N.S.W." @default.
- W1593014734 hasPublicationYear "1985" @default.
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