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Geology Of The Auckland Region
The Auckland Region of New Zealand is built on a basement of greywacke rocks that form many of the islands in the Hauraki Gulf, the Hunua Ranges, and land south of Port Waikato. The Waitākere Ranges in the west are the remains of a large andesitic volcano, and Great Barrier Island was formed by the northern end of the Coromandel Volcanic Zone. The Auckland isthmus and North Shore are composed of Waitemata sandstone and mudstone, and portions of the Northland Allochthon extend as far south as Albany. Little Barrier Island was formed by a relatively isolated andesitic volcano, active around 1 to 3 million years ago. The Manukau and South Kaipara Harbours are protected by the recent sand dune deposits of the Awhitu and South Kaipara Peninsulas. Recent basaltic volcanic activity has produced many volcanic cones throughout the Auckland Region, including the iconic Rangitoto Island. Basement rocks As with most of New Zealand, the basement rocks of the Auckland Region are composed o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auckland Region
Auckland () is one of the sixteen regions of New Zealand, which takes its name from the eponymous urban area. The region encompasses the Auckland Metropolitan Area, smaller towns, rural areas, and the islands of the Hauraki Gulf. Containing percent of the nation's residents, it has by far the largest population and economy of any region of New Zealand, but the second-smallest land area. On 1 November 2010, the Auckland region became a unitary authority administered by the Auckland Council, replacing the previous regional council and seven local councils. In the process, an area in its southeastern corner was transferred to the neighbouring Waikato region. Geography On the mainland, the region extends from the mouth of the Kaipara Harbour in the north across the southern stretches of the Northland Peninsula, through the Waitākere Ranges and the isthmus of Auckland and across the low-lying land surrounding the Manukau Harbour, ending within a few kilometres of the mouth o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xenolith
A xenolith ("foreign rock") is a rock fragment (country rock) that becomes enveloped in a larger rock during the latter's development and solidification. In geology, the term ''xenolith'' is almost exclusively used to describe inclusions in igneous rock entrained during magma ascent, emplacement and eruption. Xenoliths may be engulfed along the margins of a magma chamber, torn loose from the walls of an erupting lava conduit or explosive diatreme or picked up along the base of a flowing body of lava on the Earth's surface. A xenocryst is an individual foreign crystal included within an igneous body. Examples of xenocrysts are quartz crystals in a silica-deficient lava and diamonds within kimberlite diatremes. Xenoliths can be non-uniform within individual locations, even in areas which are spatially limited, e.g. rhyolite-dominated lava of Niijima volcano (Japan) contains two types of gabbroic xenoliths which are of different origin - they were formed in different temperature and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Huntly, New Zealand
Huntly ( mi, Rahui-Pōkeka) (population ) is a town in the Waikato district and region of the North Island of New Zealand. It was on State Highway 1 (until Huntly bypass opened in March 2020), south of Auckland and north of Hamilton. It is situated on the North Island Main Trunk (NIMT) railway (served by Te Huia since 6 April 2021 at a rebuilt Raahui Pookeka-Huntly Station) and straddles the Waikato River. Huntly is within the Waikato District which is in the northern part of the Waikato region local government area. History and culture Originally settled by Māori, European migrants arrived in the area some time in the 1850s. The Huntly name was adopted in the 1870s when the postmaster named it after Huntly, Aberdeenshire in Scotland. He used an old 'Huntley Lodge' stamp to stamp mail from the early European settlement. The ''Lodge'' was later dropped and the spelling changed to also drop the additional 'e'. The railway from Auckland reached Huntly in 1877, when the Huntl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King Country
The King Country (Māori: ''Te Rohe Pōtae'' or ''Rohe Pōtae o Maniapoto'') is a region of the western North Island of New Zealand. It extends approximately from the Kawhia Harbour and the town of Otorohanga in the north to the upper reaches of the Whanganui River in the south, and from the Hauhungaroa and Rangitoto Ranges in the east to near the Tasman Sea in the west. It comprises hill country, large parts of which are forested. The region, albeit loosely defined, is very significant in New Zealand's history. The term "King Country" dates from the New Zealand Wars of the 1860s, when colonial forces invaded the Waikato and forces of the Māori King Movement withdrew south of what was called the ''aukati'', or boundary, a line of '' pa'' alongside the Puniu River near Kihikihi. Land behind the ''aukati'' remained native territory, with Europeans warned they crossed it under threat of death. Known for its rugged, rural roads and diverse landscape, the King Country has a warm cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waikato
Waikato () is a Regions of New Zealand, local government region of the upper North Island of New Zealand. It covers the Waikato District, Waipa District, Matamata-Piako District, South Waikato District and Hamilton, New Zealand, Hamilton City, as well as Hauraki Plains, Hauraki, Coromandel Peninsula, the northern King Country, much of the Taupō District, and parts of Rotorua, Rotorua District. It is governed by the Waikato Regional Council. The region stretches from Coromandel Peninsula in the north, to the north-eastern slopes of Mount Ruapehu in the south, and spans the North Island from the west coast, through the Waikato and Hauraki to Coromandel Peninsula on the east coast. Broadly, the extent of the region is the Waikato River catchment. Other major catchments are those of the Waihou River, Waihou, Piako River, Piako, Awakino River (Waikato), Awakino and Mokau River, Mokau rivers. The region is bounded by Auckland Region, Auckland on the north, Bay of Plenty on the east ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northland Region
The Northland Region ( mi, Te Tai Tokerau) is the northernmost of New Zealand's 16 local government regions. New Zealanders sometimes refer to it as the Winterless North because of its mild climate all throughout the year. The main population centre is the city of Whangārei, and the largest town is Kerikeri. At the 2018 New Zealand census, Northland recorded a population growth spurt of 18.1% since the previous 2013 census, placing it as the fastest growing region in New Zealand, ahead of other strong growth regions such as the Bay of Plenty (2nd with 15%) and Waikato (3rd with 13.5%). Geography The Northland Region occupies the northern 80% (265 km) of the 330 km Northland Peninsula, the southernmost part of which is in the Auckland Region. Stretching from a line at which the peninsula narrows to a width of just 15 km a little north of the town of Wellsford, Northland Region extends north to the tip of the Northland Peninsula, covering an area of 13,940&nb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coromandel Peninsula
The Coromandel Peninsula ( mi, Te Tara-O-Te-Ika-A-Māui) on the North Island of New Zealand extends north from the western end of the Bay of Plenty, forming a natural barrier protecting the Hauraki Gulf and the Firth of Thames in the west from the Pacific Ocean to the east. It is wide at its broadest point. Almost its entire population lives on the narrow coastal strips fronting the Hauraki Gulf and the Bay of Plenty. In clear weather the peninsula is clearly visible from Auckland, the country's biggest city, which lies on the far shore of the Hauraki Gulf, to the west. The peninsula is part of the Thames-Coromandel District of the Waikato region. Origin of the name The Māori name for the Coromandel comes from the Māori legend of Māui and the Fish, in which the demigod uses his hook to catch a great fish from the depths of te Moana-Nui-a-Kiwa (The Pacific Ocean). ''Te Tara-O-Te-Ika-A-Māui'' means 'The spine of Māui's fish'. The spine can be understood to be the C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argillite
:''"Argillite" may also refer to Argillite, Kentucky.'' Argillite () is a fine-grained sedimentary rock composed predominantly of indurated clay particles. Argillaceous rocks are basically lithified muds and oozes. They contain variable amounts of silt-sized particles. The argillites grade into shale when the fissile layering typical of shale is developed. Another name for poorly lithified argillites is ''mudstone''. These rocks, although variable in composition, are typically high in aluminium and silica with variable alkali and alkaline earth cations. The term ''pelitic'' or ''pelite'' is often applied to these sediments and rocks. Metamorphism of argillites produces slate, phyllite, and pelitic schist. Belt Supergroup The Belt Supergroup, an assemblage of rocks of late Precambrian (Mesoproterozoic) age, includes thick sequences of argillite, as well as other metamorphosed or semi-metamorphosed mudstones.Schieber, J. 1990. Significance of styles of epicontinental shale sedime ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chert
Chert () is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a precipitation (chemistry), chemical precipitate or a diagenesis, diagenetic replacement, as in petrified wood. Chert is typically composed of the petrified remains of siliceous ooze, the biogenic sediment that covers large areas of the deep ocean floor, and which contains the silicon skeletal remains of diatoms, Dictyochales, silicoflagellates, and radiolarians. Precambrian cherts are notable for the presence of fossil cyanobacteria. In addition to Micropaleontology, microfossils, chert occasionally contains macrofossils. However, some chert is devoid of any fossils. Chert varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty redW.L. Roberts, T.J. Campbell, G.R. Rapp Jr. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kawau
Kawau Island is in the Hauraki Gulf / Tīkapa Moana, close to the north-eastern coast of the North Island of New Zealand. At its closest point it lies off the coast of the Northland Peninsula, just south of Tāwharanui Peninsula, and about by sea journey from Sandspit Wharf, and shelters Kawau Bay to the north-east of Warkworth. It is north of Auckland. Mansion House in the Kawau Island Historic Reserve is an important historic tourist attraction. Almost every property on the Island relies on direct access to the sea. There are only two short roads serving settlements at Schoolhouse Bay and South Cove, and most residents have private wharves for access to their front door steps. The island is named after the Māori word for the shag (cormorant) bird. A regular ferry service operates to the island from Sandspit Wharf on the mainland, as do water taxi services. Geography The island is at its longest axes, and is almost bisected by the long inlet of Bon Accord Harbour w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tiritiri Matangi
Tiritiri Matangi Island is located in the Hauraki Gulf of New Zealand, east of the Whangaparaoa Peninsula in the North Island and north east of Auckland. The island is an open nature reserve managed by the Supporters of Tiritiri Matangi Incorporated, under the supervision of the Department of Conservation and is noted for its bird life, including takahē, North Island kōkako and kiwi. It attracts between 30,000 and 32,000 visitors a year, the latter figure being the maximum allowed by the Auckland Conservation Management Strategy. The name, Māori for "tossed by the wind", is often popularly shortened to Tiritiri. Māori mythology considers the island to be a float of an ancestral fishing net. History Human use The first people to settle on the island were Māori of the Kawerau iwi. Later, members of the Ngāti Pāoa moved to the island, like the Kawerau partly for shark fishing until about 1700, when the Kawerau regained control and remained until forced to retrea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
