Geology of the Takahe valley area, Eastern Fiordland.

Jamieson, Bryan Stuart, 1956-

Fiordland gneiss, epidiorite and granodiorite are mapped and described together with an onlapping transgressive sequence of Cainozoic sediments. Amphibolite, plagioclase-biotite-hornblende gneiss and plagioclase-biotite. gneiss are differentiated within the gneisses previously mapped by Wood (1962) as Wet Jacket Formation. A basic intrusion, the Garden Point Epidiorite, occurs in the southern part of the study area, and is considered an offshoot of the main Mt. Luxmore basic and ultrabasic intrusive body. The synmetamorphic Takahe Granodiorite (new name) occupies the greatest area in the region studied and is considered similar to other Eastern Fiordland acid intrusives.
Whole rock geochemical analysis was undertaken on the gneiss, epidiorite and granodiorite. The results obtained were used in correlation with other Eastern Fiordland rocks as well as providing information on depth and temperature of emplacement (granodiorite), primary lithology (gneisses) and cryptic variation (epidiorite).
The onlapping Cainozoic sediments are studied, and type sections proposed for the formations originally named by McKellar (1956). Thirteen lithofacies (A - M) are recognized within the sequence. Palaeontological, petrographic and sedimentologic evidence is used to infer a depositional history and palaeogeography, The sediments, non and shallow marine sandstones and limestones overlain disconformably by a condensed sequence, hemipelagic muds, redeposited sands and flysch are strongly influenced by the interpreted tectonic history of the Moonlight Tectonic Zone.

97 leaves : illus. (part col.) map. (col. in pocket) ; 30 cm.

1979Jamieson

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