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Dunedin Volcano
The Dunedin Volcano is an extensively eroded multi-vent shield volcano that was active between 16 and 10 million years ago. It originally extended from the modern city of Dunedin, New Zealand to Aramoana about 25 km away. Extensive erosion has occurred over the last 10 million years and Otago Harbour now fills the oldest parts of the volcano. The remnants of the volcano form the hills around Otago Harbour (including Mount Cargill, Flagstaff, Saddle Hill, Signal Hill, and Otago Peninsula). Volcanism began in a shallow marine environment. The volcano became larger with flows of basalt and minor trachyte creating the bulk of the volcano. The final phase of eruptions are preserved as phonolite domes around Mount Cargill. Traces of the old Dunedin Volcano are best seen in the Dunedin Botanic Garden's geology walk, the cliffs at Aramoana and the geomorphology of Mount Cargill which has preserved lava domes. Basaltic columns are also to be found as prominent features above Second B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basalt
Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial planet, rocky planet or natural satellite, moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of volcanism on Venus, Venus, which cover ~80% of the surface, are basaltic; the lunar mare, lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otago Peninsula
The Otago Peninsula ( mi, Muaūpoko) is a long, hilly indented finger of land that forms the easternmost part of Dunedin, New Zealand. Volcanic in origin, it forms one wall of the eroded valley that now forms Otago Harbour. The peninsula lies south-east of Otago Harbour and runs parallel to the mainland for 20 km, with a maximum width of 9 km. It is joined to the mainland at the south-west end by a narrow isthmus about 1.5 km wide. The suburbs of Dunedin encroach onto the western end of the peninsula, and seven townships and communities lie along the harbourside shore. The majority of the land is sparsely populated and occupied by steep open pasture. The peninsula is home to many species of wildlife, notably seabirds, pinnipeds, and penguins; several ecotourism businesses operate in the area. Geography The peninsula was formed at the same time as the hills facing it across the harbour, as part of the large, long-extinct, Dunedin Volcano. Several of the peninsula' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene Shield Volcanoes
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shield Volcanoes Of New Zealand
A shield is a piece of personal armour held in the hand, which may or may not be strapped to the wrist or forearm. Shields are used to intercept specific attacks, whether from melee weapon, close-ranged weaponry or projectiles such as arrows, by means of active blocks, as well as to provide passive protection by closing one or more lines of engagement during combat. Shields vary greatly in size and shape, ranging from large panels that protect the user's whole body to small models (such as the buckler) that were intended for hand-to-hand-combat use. Shields also vary a great deal in thickness; whereas some shields were made of relatively deep, absorbent, wooden planking to protect soldiers from the impact of spears and crossbow bolts, others were thinner and lighter and designed mainly for deflecting blade strikes (like the roromaraugi or qauata). Finally, shields vary greatly in shape, ranging in roundness to angularity, proportional length and width, symmetry and edge pattern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct Volcanoes
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of Dunedin
Dunedin ( ; mi, Ōtepoti) is the second-largest city in the South Island of New Zealand (after Christchurch), and the principal city of the Otago region. Its name comes from , the Scottish Gaelic name for Edinburgh, the capital of Scotland. The city has a rich Scottish, Chinese and Māori heritage. With an estimated population of as of , Dunedin is both New Zealand's seventh-most populous metro and urban area. For historic, cultural and geographic reasons the city has long been considered one of New Zealand's four main centres. The urban area of Dunedin lies on the central-eastern coast of Otago, surrounding the head of Otago Harbour, and the harbour and hills around Dunedin are the remnants of an extinct volcano. The city suburbs extend out into the surrounding valleys and hills, onto the isthmus of the Otago Peninsula, and along the shores of the Otago Harbour and the Pacific Ocean. Archaeological evidence points to lengthy occupation of the area by Māori prior to the ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banks Peninsula Volcano
The Banks Peninsula Volcano is an extinct volcanic complex to the east of Christchurch on New Zealand's South Island.Sewell 1986 While the volcano is highly eroded it still forms the majority of Banks Peninsula with a highest point of . It is a composite of two main eruptive centers one originating at Lyttelton Harbour, the other at Akaroa Harbour. The eruptions were predominantly basaltic, with associated andesite and trachytes, with minor rhyolite. The volcanic activity occurred in the Late Miocene and possibly extended into the Early Pliocene. There are four volcanic groups, all of which are within the Māui Supergroup.Mortimer et al. 2014 The Christchurch earthquakes led to rumors of a possible eruption, however, there is no known magma chamber beneath the volcano and there has not been any sign of volcanic activity in the last 5 million years. Origin and relationship to other volcanoes New Zealand's South Island has many extinct volcanic centers with no obvious tectonic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otago Harbour Panorama
Otago (, ; mi, Ōtākou ) is a region of New Zealand located in the southern half of the South Island administered by the Otago Regional Council. It has an area of approximately , making it the country's second largest local government region. Its population was The name "Otago" is the local southern Māori dialect pronunciation of "Ōtākou", the name of the Māori village near the entrance to Otago Harbour. The exact meaning of the term is disputed, with common translations being "isolated village" and "place of red earth", the latter referring to the reddish-ochre clay which is common in the area around Dunedin. "Otago" is also the old name of the European settlement on the harbour, established by the Weller Brothers in 1831, which lies close to Otakou. The upper harbour later became the focus of the Otago Association, an offshoot of the Free Church of Scotland, notable for its adoption of the principle that ordinary people, not the landowner, should choose the ministers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blackhead (New Zealand)
Blackhead is a promontory on the coast of Otago, New Zealand. It lies within the city limits of Dunedin, some southwest of the city centre. The promontory extends some 500 metres into the ocean, and rises to a height of a little over . Māori names for Blackhead include ''Te Wai o Tinarau'' (the waters of Tinarau) and ''Makereatu'' (to leave a seed).GC39JRR Blackhead Basalt Columns " ''geocaching.com''. Retrieved 7 March 2019. The area of coast to the east of Blackhead is rugged and steep, with many cliff prominences. The tourist attraction of lies in this area, 3 km from Blackhead. To the west, the coast is more low-lying with beaches. The comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
St Clair, New Zealand
St Clair is a leafy residential suburb of Dunedin, New Zealand. It is located on the Pacific Ocean coast five kilometres from the city centre on the southwesternmost part of the coastal plain which makes up the southern part of the urban area, and also climbs the slopes of Forbury Hill immediately to the west of this plain. St Clair's 2001 population was 4,179. Geography St Clair's main geographical features are St Clair Beach and the promontory of Forbury Hill which rises above the plain. The summit of the hill lies within the grounds of St Clair Golf Course, in the west of the suburb. Forbury Hill's flanks include a large cliff face one kilometre inland from the beach and a rocky headland which juts into the Pacific Ocean. The small outcrop of White Island lies to the immediate south of St Clair beach. The inland cliff, which runs parallel with and to the west of Forbury Road, was the site of a quarry in the early days of the city. The city's largest retirement village a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second Beach (New Zealand)
St Clair is a leafy residential suburb of Dunedin, New Zealand. It is located on the Pacific Ocean coast five kilometres from the city centre on the southwesternmost part of the coastal plain which makes up the southern part of the urban area, and also climbs the slopes of Forbury Hill immediately to the west of this plain. St Clair's 2001 population was 4,179. Geography St Clair's main geographical features are St Clair Beach and the promontory of Forbury Hill which rises above the plain. The summit of the hill lies within the grounds of St Clair Golf Course, in the west of the suburb. Forbury Hill's flanks include a large cliff face one kilometre inland from the beach and a rocky headland which juts into the Pacific Ocean. The small outcrop of White Island lies to the immediate south of St Clair beach. The inland cliff, which runs parallel with and to the west of Forbury Road, was the site of a quarry in the early days of the city. The city's largest retirement village ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dunedin Botanic Garden
The Dunedin Botanic Garden (known in local slang as the "Botans", "Botang", Botanic or Botanical Gardens) is located at the northern end of central Dunedin, in the South Island of New Zealand. The garden is close to the University of Otago and one of the city's most historic cemeteries, the Northern Cemetery, on a spur of Signal Hill and on the river plain immediately below it. The location of the gardens makes them popular with university students, as they lie between the university and the mouth of North East Valley, which houses a substantial proportion of the city's tertiary students. The gardens are also easily accessible by road from the city centre, being located close to the northern end of the city's main business street, George Street, and at the northern end of the city's one-way street system, part of State Highway 1. A small suburban shopping centre lies close to the garden's northern entrance at an intersection known as The Gardens Corner. The garden The two parts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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