Geology of Gulches Head Peninsula, S.W. Fiordland
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Abstract:
Rock exposure on Gulches Head Peninsula; in Anchorage Cove; and northwards to Stripe Head comprises a basement of metamorphosed Lower Ordovician and Tuhua Sequence flysch sediments and quartzites which have been intruded by four different intrusive rock types. Mafic Alkali Diorite dykes and sills were probably intruded into low stratigraphic levels of Tuhua sediments during the Tuhua Orogenic Cycles. Three other intrusive rock types (members of the Kakapo Granite Batholith) were intruded following the metamorphism of the Tuhua sediments and intrusives - possibly during the Rangitata Orogeny. Low stratigraphic represents of an ?Oligocene transgressive sequence (Kaikoura Sequence sediments) unconformably overlie the basement Tuhua Sequence and ?Rangitata Sequence rocks.
Two new Lower Ordovician fossil localities, containing Lancefieldian (La2) graptolite faunas, are described.
Detailed investigation of the supposed Last Cove Fault was completed in Edwardson, Cunaris and Long Sounds, and although geomorphologic criteria strongly suggest the presence of this fault within the Tuhua Sequence meta-sediments between Cunaris and Long Sounds and possibly between Cunaris and Edwardson Sounds, no geologic evidence to support this interpretation has been found.
A sea level magnetometer survey was undertaken in Chalky and Preservation Inlets. Survey courses and magnetic contours are presented with a short discussion.
Two new Lower Ordovician fossil localities, containing Lancefieldian (La2) graptolite faunas, are described.
Detailed investigation of the supposed Last Cove Fault was completed in Edwardson, Cunaris and Long Sounds, and although geomorphologic criteria strongly suggest the presence of this fault within the Tuhua Sequence meta-sediments between Cunaris and Long Sounds and possibly between Cunaris and Edwardson Sounds, no geologic evidence to support this interpretation has been found.
A sea level magnetometer survey was undertaken in Chalky and Preservation Inlets. Survey courses and magnetic contours are presented with a short discussion.
Thesis description:
100 leaves : illus., maps (fold.) ; 29 cm.
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1973Badger
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Location (WKT, WGS84):
POLYGON ((166.603676563107427 -46.018031336973308,166.65911596528025 -46.080084975838837,166.576013260586905 -46.10150711667594,166.542548755981869 -46.049593418330119,166.603676563107427 -46.018031336973308))
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Citation
Badger, Chris P., “Geology of Gulches Head Peninsula, S.W. Fiordland,” Otago Geology Theses, accessed February 7, 2025, https://theses.otagogeology.org.nz/items/show/68.