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new zealand basalt whole

Age relationships and tectonic implications of late ...

194 new, whole rock, major and trace element analyses (Smith & Black 1993), these dates prompt a reassessment of the ... Alkali basalt Transitional basalt Alkali basalt Transitional basalt Transitional basalt Nepheline hawaiite Transitional basalt Hawaiite ... New Zealand Journal of Geology and Geophysics, 1993, Vol. 36.

Magmatic architecture below the Okataina Volcanic Centre ...

the Taupō Volcanic Zone, Aotearoa New Zealand. Although best known for its high rates of explosive rhyolitic volcanism, there are numerous examples of basaltic to basaltic-andesite contributions to OVC eruptions, ranging from minor involvement of basalt in rhyolitic

Rhyolite magma processes of the ̃AD 1315 Kaharoa eruption ...

Products of the ̃5 km 3 (DRE), ̃5-yr duration Kaharoa eruption episode display two main high-silica rhyolite compositions; T1 erupted early (as plinian pyroclastics), and T2 erupted late (mostly as lavas). The T1 and T2 eruptive types are defined by crystal contents and compositional variations in whole rock, glass, plagioclase and biotite.

High-alumina basalts of Taupo Volcanic Zone, New Zealand ...

High-alumina basalt occurs at eight localities in the Taupo Volcanic Zone associated with the Okataina, Maroa and Taupo calderas. At Tarawera the basalt is associated with a series of craters aligned NNE, and at K Trig. a series of scoria cones of similar alignment.

The origin of plagioclase phenocrysts in basalts from ...

Late Quaternary, porphyritic basalts erupted in the Kaikohe-Bay of Islands area, New Zealand, provide an opportunity to explore the crystallization and ascent history of small volume magmas in an intra-continental monogenetic volcano field. The plagioclase phenocrysts represent a diverse crystal cargo. Most of the crystals have a rim growth that is compositionally similar to groundmass ...

Tarawera 1886, New Zealand — A basaltic plinian fissure ...

Abstract. New Zealand's biggest and most destructive volcanic eruption of historical times was that of Tarawera in 1886. The resulting scoria fall has a dispersal very similar in extent to that of the Vesuvius A.D. 79 pumice fall and is one of the few known examples of a basaltic deposit of plinian type. A new estimate of the volume (2 km 3) is ...

Geology of New Zealand - Wikipedia

The geology of New Zealand is noted for its volcanic activity, earthquakes and geothermal areas because of its position on the boundary of the Australian Plate and Pacific Plates.New Zealand is part of Zealandia, a microcontinent nearly half the size of Australia that broke away from the Gondwanan supercontinent about 83 million years ago. New Zealand's early separation from other landmasses ...

Volcano map of New Zealand — Science Learning Hub

A scoria cone volcano that last exploded around 1,300–1,800 years ago. Located north-west of Paihia in the Bay of Islands, it is the northernmost volcano in New Zealand. Acknowledgement: GeoNet. Whāngārei Volcanic Field. Formed over a hot spot (not a plate …

(PDF) Petrology and geochemistry of intraplate basalts in ...

RECEIVED JUNE 1, 2003; ACCEPTED SEPTEMBER 28, 2004 ADVANCE ACCESS PUBLICATION NOVEMBER 26, 2004 The South Auckland Volcanic Field is a …

Building stone – Te Ara Encyclopedia of New Zealand

New Zealand Basalt - Classic Stone

K/Ar ages from the volcanics of Northland, New Zealand

New Zealand Cal-Z ~ GA Map General location culated IV no. ref. and whole Formation %K 'oAr*j'OK %,oAr age ±1" no. rock material atm (x 10 6 yrs) rJ'J 3168 12 Te Puke Cones (basalt) Taheke Basalt 0'968 9'887 x 10-7 99'0 0'017 0'006.., 0'969::;; 0'969 'tl 3167 11 Edge's Quarry (basalt) Horeke Basalt 0'557 0'559 3'046 x 10-6 83'3 0'521 0'013 s ...

New Zealand Basalt - Classic Stone

New Zealand Basalt Colours. The New Zealand Basalt Stone Profile comes in one colour. Below is the option. New Zealand Basalt. This profile has the traditional straight-edge shaped blocks in various sizes. It also has the chiselled textures normally associated with basalt and the deep grey colour tones.

Home - Classic Stone

Welcome to Classic Stone. Classic Stone, a New Zealand owned company (established in 2000), is renowned for the high quality, authentic stone veneer products that it manufactures for both the residential and commercial markets nationwide. Classic Stone's inspiration has come from the exquisite natural stone found throughout New Zealand.

Seasons in New Zealand | Pure New Zealand

Summer activities tend to make the most of the sun, sea and sand. New Zealand's many beaches and lakes are perfect to cool off during the summer months. Temperatures range from 21 - 32 degrees celsius (70 - 90F). Autumn: March - May. In autumn, New Zealand enjoys some of the most settled weather of the whole year. Soak up long, sunny days and ...

High-alumina basalts of Taupo Volcanic Zone, New Zealand ...

High-alumina basalt occurs at eight localities in the Taupo Volcanic Zone associated with the Okataina, Maroa and Taupo calderas. At Tarawera the basalt is associated with a series of craters aligned NNE, and at K Trig. a series of scoria cones of similar alignment. On a broader scale the eruptive centres lie on three lines probably ...

The Geology of New Zealand / Regional Geology / Land and ...

The New Zealand region lies in the southwest Pacific Ocean astride a distinct belt of volcanic and earthquake activity that surrounds the Pacific Ocean. This is the Pacific Mobile Belt or "Ring of Fire" and the activity results from the structure of the Earth's crust.

Petrology and Geochemistry of Intraplate Basalts in the ...

INTRODUCTION. The South Auckland Volcanic Field is one of a number of Pliocene to Recent continental basaltic intraplate volcanic fields in North Island, New Zealand ().The field formed between 0·51 and 1·59 Ma (Briggs et al., 1994) and is distinct from the younger Auckland Volcanic Field to the north.It consists of eroded basaltic lava flows, scoria cones, and tuff deposits, produced from ...