Browsing by Supervisor "Briggs, Roger M."
Now showing items 1-17 of 17
-
A comparison of buried andesites at Ngatamariki and Rotokawa geothermal fields, Taupo
(University of Waikato, 2011)The Rotokawa and Ngatamariki geothermal systems are hosted by hydrothermally altered Quaternary andesitic, dacitic and rhyolitic volcanics resting on Mesozoic Torlesse greywacke basement, and covered by lacustrine sediments ... -
Emplacement processes of ignimbrites in the Ongatiti Valley, southeast Te Kuiti
(University of Waikato, 2012)The Mangakino volcanic centre (MVC) is the oldest rhyolitic volcano of the Taupo Volcanic Zone (TVZ) located on the westernmost boundary. Ten eruptive deposits have been derived from the MVC and this study focuses on the ... -
Eruption Dynamics and Hydrological Implications of Basaltic Volcanic Centres at Lake Taupo
(The University of Waikato, 2010)The Taupo Volcanic Centre (TVC) is a major rhyolite centre within the Taupo Volcanic Zone, yet a small volume of the centre is comprised of monogenetic basalt volcanoes. Four TVC basalts that lie north of Lake Taupo have ... -
Geology of the northern Mamaku Plateau
(The University of Waikato, 1986)The geology of the northern Mamaku Plateau is dominated by the rhyolitic Mamaku and Waimakariri lgnimbrites, although exposures of the dacitic Waiteariki Ignimbrite are common in river gorges. The Mamaku lgnimbrite ... -
Geology of the western Mamaku Plateau and variations in the Mamaku ignimbrite
(The University of Waikato, 1982)Pleistocene ignimbrites in the western Mamaku Plateau east of Putaruru consist of the following successively younger formations: (?) Ongatiti Ignimbrite, Ahuroa Ignimbrite, Whakamaru Ignimbrite, Waihou Ignimbrite (new), ... -
Geology, History and Stratigraphy of Hydrothermal Eruptions in the Rotorua Geothermal Field
(University of Waikato, 2003)The study area is the Rotorua geothermal field (RGF), which is located in the southern end of the Rotorua caldera. Distribution of surface geothermal activity, hydrothermal eruption (HE) deposits and craters have been ... -
Petrogenesis and evolution of alkalic basaltic magmas in a continental intraplate setting: the South Auckland Volcanic Field, New Zealand
(The University of Waikato, 2002)The South Auckland volcanic field (SAVF) is situated in a continental intraplate tectonic setting and consists of silica-undersaturated alkalic basalts that erupted from about 100 centres between 1.59 and 0.51 Ma. The ... -
Petrologic, geochemical and isotopic evolution of rhyolite lavas from the Okataina, Rotorua and Kapenga Volcanic Centres, Taupo Volcanic Zone, New Zealand
(The University of Waikato, 2001)The Okataina Volcanic Centre (OVC) is a highly active modern silicic magmatic system at the northeastern end of the central Taupo Volcanic Zone, North Island, New Zealand. This study presents a set of petrographic, ... -
Rheology and Flow Emplacement Processes of the 1954 Lavas, Mount Ngauruhoe
(The University of Waikato, 2010)The rheology and emplacement dynamics of basaltic and rhyolitic lava flows have been studied extensively, leading to the development of numerous rheological and flow behaviour models; however, the flow dynamics of more ... -
Stratigraphy, chronology, and correlation of the Plio-Pleistocene (c. 2.2-0.8 Ma) Kauroa Ash sequence, western central North Island, New Zealand
(The University of Waikato, 2000)The Kauroa Ash beds (K-beds) comprise a 12-20 m-thick sequence of extremely weathered, clay-rich (40-95% <4 μm clay) beds of tephra and loess, and associated paleosols. Found in isolated remnants throughout the western ... -
The volcanic geology of the Mt Karioi region
(The University of Waikato, 1981)Mt Karioi is a 756 m high stratovolcano of Pliocene age (2.9 - 2.3 m.y. B.P.) situated south of Raglan, on the west coast of the North Island. Immediately surrounding Mt Karioi are a number of small low-lying volcanic ... -
U-Pb Dating of Silicic Volcanic Rocks of the Eastern Coromandel Peninsula
(University of Waikato, 2012)The eastern Coromandel Volcanic Zone (CVZ) is an area of predominantly andesite-dacite-rhyolite volcanism which was erupted and subsequently hydrothermally altered in parts during the Late Miocene to Early Pleistocene. ... -
Volcanic geology and hydrothermal alteration of the Onemana Area, Eastern Coromandel Peninsula
(The University of Waikato, 1995)The Onemana Peninsula is located on the eastern side of the Coromandel Peninsula north of the township of Whangamata. This study investigates the volcanology, structure and hydrothermal alteration of the northern half of ... -
Volcanic geology, geochemistry and geochronology of the Kapowai caldera complex, Coromandel volcanic zone, New Zealand
(The University of Waikato, 2000)Kapowai Caldera Complex (KCC) is a late Miocene (ca. 8.5-4.9 Ma) caldera volcano situated in the central Coromandel Volcanic Zone (CVZ), North Island, New Zealand. It is the largest (10 x 11 km diameter) onland caldera ... -
Volcanology of the Raventhorpe and Pokeno West Volcanic Complexes, South Auckland Volcanic Field
(University of Waikato, 2012)The South Auckland volcanic field hosts at least 82 volcanic centres throughout the Pukekohe, Bombay, Tuakau, Pukekawa and Onewhero regions. The monogenetic basaltic volcanic field was active between 1.59 to 0.51 Ma, ... -
Volcanology of tuff rings at Kellyville, Onewhero and Bombay, South Auckland Volcanic Field
(University of Waikato, 2011)The South Auckland volcanic field hosts 82 volcanic centres over an area of approximately 300 km2 in the Pukekohe, Bombay, Tuakau, Pukekawa and Onewhero regions. The intraplate, monogenetic basaltic volcanic field was ... -
Weathering of basalt: geotechnical & geochemical aspects
(The University of Waikato, 2002)Geochemical influences on the geotechnical parameters of weathered Karamu Basalt are determined and the likely processes involved in basalt weathering are investigated. Geochemical and geotechnical parameters of basalt at ...
