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Kakepuku
Kakepuku (Kakipuku-o-kahurere) is a volcanic cone which rises from the plain between the Waipā and Puniu rivers, about NW of Te Kawa and SW of Te Awamutu in the Waikato region of New Zealand's North Island. Geology The 'Geology of the Waikato Area' says, "The Alexandra Volcanic Group consists of several low-angle composite cones, including Karioi, Pirongia, Kakepuku, Te Kawa and Tokanui volcanoes, aligned southeast from Mount Karioi on the coast to Tokanui. They comprise about 55 km3 of mainly basaltic material erupted from at least 40 volcanic centres. The Alexandra Volcanic Group is the product oflate Pliocene to earliest Pleistocene back-arc volcanism, when both subduction-related basaltic magmas (Karioi, Pirongia, Kakepuku and Te Kawa) and intraplate alkalic basalts (Okete) were erupted. K-Ar ages range from 2.74 to 1.6 Ma, with the ages of the different magma series overlapping". It goes on to say Kakepuku is "composed mainly of basalt lava with minor tu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexandra Volcanic Group
The Alexandra Volcanic Group (also known as Alexandra volcanic lineament or Alexandra Volcanics) is a chain of extinct calc-alkalic basaltic stratovolcanoes that were most active between 2.74 to 1.60 million years ago but is now known to have had more recent activity between 1.6 to 0.9 million years ago. They extend inland from Mount Karioi near Raglan with Mount Pirongia being the largest, with Pukehoua on the eastern slopes of Pirongia, Kakepuku, Te Kawa, and Tokanui completing the definitive lineament. The associated, but usually separated geologically basaltic monogenetic Okete volcanic field (also known as the Okete Volcanic Formation or Okete Volcanics), lies mainly between Karioi and Pirongia but extends to the east and is quite scattered. Geology The chain extends in the Alexandra volcanic lineament, an alignment striking north-west to south-east over in length and is an example of backarc, intraplate basaltic volcanism that is very rare on land. This is because th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Te Kawa
Te Kawa is a rural community in the Ōtorohanga District and Waikato region of New Zealand's North Island. It lies just to the south of the volcanic hills of Kakepuku and Te Kawa. Until the swamp was drained in the 1900s, Te Kawa was well known for its eels. Te Kawa railway station, a station on the North Island Main Trunk, was located in the area. It operated from 9 March 1887 and closed 17 October 1971. A post office was open by 1909 and a dairy factory and a school existed in 1913. Te Kawa Bridge over the Waipā opened in 1915. A town hall opened in 1928. Te Whakaaro Kotahi Marae in Te Kawa is a meeting ground of the Ngāti Maniapoto hapū of Te Kanawa. It includes a small building. Demographics Te Kawa settlement is in three SA1 statistical areas which cover . The SA1 areas are part of the larger Te Kawa statistical area. The SA1 areas had a population of 504 at the 2018 New Zealand census, an increase of 84 people (20.0%) since the 2013 census, and an increase of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tokanui, Waikato
Tokanui is a rural locality in the Waipa District and Waikato region of New Zealand's North Island. It is located southwest of Te Awamutu. runs to the east of the locality. History Te Mawhai railway station operated from 1887 to 1962, originally as Te Puhi railway station. Tokanui is the site of the former Tokanui Psychiatric Hospital, which operated from 1912 to 1997. The closure of the hospital resulted in the loss of 600 jobs, and there was little alternative employment available in the area. Tokanui Crossroads Hall The hall, at 4 Te Kawa Road, about south of Tokanui, opened on 18 January 1928. It is a converted casein factory, which had been working since at least 1919. Demographics Tokanui settlement is in an SA1 statistical area which covers . The SA1 area is part of the larger Tokanui statistical area. The SA1 area had a population of 144 at the 2018 New Zealand census, a decrease of 18 people (−11.1%) since the 2013 census, and a decrease of 9 people (− ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karioi
Karioi or Mount Karioi is a 2.4 million year old extinct stratovolcano SW of Raglan in the Waikato region of New Zealand's North Island. It was the earliest of the line of 6 calcalkalic volcanoes, the largest of which is Mount Pirongia (the others are at Kakepuku, Te Kawa, Tokanui, Waikeria and probably Puketotara). Karioi forms a background to many parts of Raglan. Karioi was also a Highway Board area around the maunga from 1870 to 1889, when it was absorbed (with Whaingaroa Board area and formed into Karioi Riding) into Raglan County Council. In 1876 it had a population of 112 in 27 houses and in 1889 119 ratepayers, 80 of them absentees. Karioi is also a location on the Central Plateau (see article on Karioi railway station). History and culture Pre-European history Many iwi whakapapa back to Karioi, which features in several Māori legends. One says that, a long time ago, Karewa was the husband of Karioi, but he flirted with her sister, Pirongia, and was cast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Te Awamutu
Te Awamutu is a town in the Waikato region in the North Island of New Zealand. It is the council seat of the Waipa District and serves as a service town for the farming communities which surround it. Te Awamutu is located some south of Hamilton on State Highway 3, one of the two main routes south from Auckland and Hamilton. Te Awamutu has a population of making it the fifth-largest urban area in the Waikato behind Hamilton, Taupō, Cambridge and Tokoroa. The town is often referred to as "The Rose Town of New Zealand" because of its elaborate rose gardens in the centre of the town. Many local businesses use "Rosetown" in their name, and the symbol of the rose is widely used on local signs and billboards. The local paper, ''Te Awamutu Courier'', has a symbol of a rose in the masthead on its front page. History and culture Tainui Maori first settled in the area in about 1450, according to noted Tainui historian Te Hurinui-Jones. Te Awamutu means "the river cut short", as i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Island Main Trunk
The North Island Main Trunk (NIMT) is the main railway line in the North Island of New Zealand, connecting the capital city Wellington with the country's largest city, Auckland. The line is long, built to the New Zealand rail gauge of and serves the large cities of Palmerston North and Hamilton. Most of the NIMT is single track with frequent passing loops, but has double track - * between Wellington and Waikanae, except for of single-track through tunnels between North Junction ( from Wellington) and South Junction, ( from Wellington), on the Pukerua Bay to Paekakariki section, * between Hamilton and Te Kauwhata (except for the single-track Waikato River Bridge at Ngāruawāhia), and * between Meremere and Auckland Britomart. Around (approximately 65%) of the line is electrified in three separate sections: one section at 1600 V DC between Wellington and Waikanae, and two sections at 25 kV AC: between Palmerston North and Te Rapa (Hamilton) and between Papakura ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Igneous Rock
Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. Geological significance Igneous and metamorphic rocks make up 90–95% of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkali
In chemistry, an alkali (; from ar, القلوي, al-qaly, lit=ashes of the saltwort) is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The adjective alkaline, and less often, alkalescent, is commonly used in English as a synonym for basic, especially for bases soluble in water. This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base, and they are still among the most common bases. Etymology The word "alkali" is derived from Arabic ''al qalīy'' (or ''alkali''), meaning ''the calcined ashes'' (see calcination), referring to the original source of alkaline substances. A water-extract of burned plant ashes, called potash and composed mostly of potassium carbonate, was mildly basic. After heating this substance with calcium hydroxide (''slaked lim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
K–Ar Dating
Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites. In these materials, the decay product is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies ( recrystallizes). The amount of argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors. These factors introduce error limits on the upper and lower bounds of dating, so that the final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure or open air. Time since recrystallization is calculated by measuring the ratio of the amount of accumulated to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuff
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, ''tuffaceous sandstone''). Tuff composed of sandy volcanic material can be referred to as volcanic sandstone. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Because it is common in Italy, the Romans used it often for construction. The Rapa Nui people used it to make most of the ''moai'' statues on Easter Island. Tuff can be classified as either igneous or sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentological terms. Tuff is often erroneously called tufa in guidebooks and in television programmes. Volcanic ash The material that is expelled in a vol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subduction
Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle. A region where this process occurs is known as a subduction zone, and its surface expression is known as an arc-trench complex. The process of subduction has created most of the Earth's continental crust. Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately two to eight centimeters per year along most plate boundaries. Subduction is possible because the cold oceanic lithosphere is slightly denser than the underlying asthenosphere, the hot, ductile layer in the upper mantle underlying the cold, rigid lithosphere. Once initiated, stable subduction is driven mostly by the negative buoyancy of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
