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Joseph Gilbert Seamount
Joseph Gilbert Seamount is a large seamount in the Tasman Sea located west of the South Island of New Zealand at the southern edge of the Lord Howe Rise. It has an elongated northwest–southeast trend, covering an area of about and rising to below sea level. The seamount is a continental fragment that rifted away from the South Tasman Rise and Challenger Plateau during the Cretaceous breakup of Gondwana. It is separated from the easterly Challenger Plateau by a deep saddle. Joseph Gilbert Seamount is named after Joseph Gilbert, captain of on the second voyage of James Cook The second voyage of James Cook, from 1772 to 1775, commissioned by the British government with advice from the Royal Society, was designed to circumnavigate the globe as far south as possible to finally determine whether there was any great s ..., and has been known under a variety of names throughout its history, including Gilbert Ridge, Gilbert Seamount Complex and Gilbert Seamount. Referenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zealandia
Zealandia (pronounced ), also known as (Māori language, Māori) or Tasmantis (from Tasman Sea), is an almost entirely submerged continent, submerged mass of continental crust in Oceania that subsided after breaking away from Gondwana 83–79 million years ago. It has been described variously as a submerged continent, continental fragment, and microcontinent. The name and concept for Zealandia was proposed by Bruce P. Luyendyk, Bruce Luyendyk in 1995, and satellite imagery shows it to be almost the size of Australia. A 2021 study suggests Zealandia is over a billion years old, about twice as old as geologists previously thought. By approximately 23 million years ago, the landmass may have been completely submerged. Today, most of the landmass (94%) remains submerged beneath the Pacific Ocean. New Zealand is the largest part of Zealandia that is above sea level, followed by New Caledonia. Mapping of Zealandia concluded in 2023. With a total area of approximately , Zealandia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Tasman Rise
The South Tasman Rise is an area of seafloor that lies 550 km south of Hobart, Tasmania in the Southern Ocean where water depths are about 1,500 metres. The South Tasman Rise is also known as the Tasmania Ridge or South Tasmania Ridge. The South Tasman Rise is a sunken land bridge that used to connect Tasmania (and by extension, the rest of Australia) to Antarctica. It served as one end of the wider Antarctic land bridge, and existed as a terrestrial connection from the Late Cretaceous (about 96 million years ago, when rifting started to significantly narrow connections between Antarctica and Australia) to the early-mid Eocene (about 50 million years ago). It started to rapidly submerge over the next few million years. Exploration of this oceanic region has taken place via sonar, gravity field, magnetic field, a few drill holes and deliberate or accidental dredging of rocks up to the surface. Geology The rise forms a northern extension from the Macquarie-Balleny Ridge whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of The New Zealand Seabed
Geography (from Ancient Greek ; combining 'Earth' and 'write', literally 'Earth writing') is the study of the lands, features, inhabitants, and phenomena of Earth. Geography is an all-encompassing discipline that seeks an understanding of Earth and world, its human and natural complexities—not merely where objects are, but also how they have changed and come to be. While geography is specific to Earth, many concepts can be applied more broadly to other Astronomical object, celestial bodies in the field of planetary science. Geography has been called "a bridge between natural science and social science disciplines." Origins of many of the concepts in geography can be traced to Greek Eratosthenes of Cyrene, who may have coined the term "geographia" (). The first recorded use of the word Geography (Ptolemy), γεωγραφία was as the title of a book by Greek scholar Claudius Ptolemy (100 – 170 AD). This work created the so-called "Ptolemaic tradition" of geography, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seamounts Of The Tasman Sea
A seamount is a large submarine landform that rises from the ocean floor without reaching the water surface (sea level), and thus is not an island, islet, or cliff-rock. Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to in height. They are defined by oceanographers as independent features that rise to at least above the seafloor, characteristically of conical form.IHO, 2008. Standardization of Undersea Feature Names: Guidelines Proposal form Terminology, 4th ed. International Hydrographic Organization and Intergovernmental Oceanographic Commission, Monaco. The peaks are often found hundreds to thousands of meters below the surface, and are therefore considered to be within the deep sea. During their evolution over geologic time, the largest seamounts may reach the sea surface where wave action erodes the summit to form a flat surface. After they have subsided and sunk below the sea surface, such flat-top ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second Voyage Of James Cook
The second voyage of James Cook, from 1772 to 1775, commissioned by the British government with advice from the Royal Society, was designed to circumnavigate the globe as far south as possible to finally determine whether there was any great southern landmass, or '' Terra Australis''. On his first voyage, Cook had demonstrated by circumnavigating New Zealand that it was not attached to a larger landmass to the south, and he charted almost the entire eastern coastline of mainland Australia, yet ''Terra Australis'' was believed to lie further south. Alexander Dalrymple and others of the Royal Society still believed that this massive southern continent should exist. After a delay brought about by the botanist Joseph Banks' unreasonable demands, the ships '' Resolution'' and ''Adventure'' were fitted for the voyage and set sail for the Antarctic in July 1772. On 17 January 1773, ''Resolution'' was the first ship to venture south of the Antarctic Circle, which she did twice more ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Gilbert (Royal Navy Officer)
Joseph Gilbert (1732–1831) was a British naval officer who was Master of HMS '' Resolution'' on the second voyage of Captain James Cook. As Master he was responsible for a number of specific duties, especially navigation. He was born in Kirton, Lincolnshire, the youngest child of John Gilbert, a farmer and Churchwarden of Kirton and later Freiston. He joined the Royal Navy and rose to the rank of ship's Master. Between 1764 and 1769 he was Master of HMS ''Guernsey'' which surveyed the coasts of Newfoundland and Labrador. He was afterwards Master of HMS ''Pearl'', which surveyed Plymouth Sound, and then of HMS ''Asia''. He was then chosen, at the relatively advanced age of 40, by Captain James Cook to be Master of HMS ''Resolution'' for his second voyage of discovery. This took place between 1772 and 1775 with the primary objective of locating ''Terra Australis Incognita'', a continent which was presumed to lie in the southern Pacific. As a capable surveyor and draughtsman Gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Society Of Australia
The Geological Society of Australia (GSA) was established as a non-profit organisation in 1952 to promote, advance and support earth sciences in Australia. The founding chairperson was Edwin Sherbon Hills. William Rowan Browne was a founder of the society and was president 1955–56. at Australian Dictionary of Biography Publications *'' Australian Journal of Earth Sciences (AJES)'' – official journal of the GSA, eight issues per year *'' The Australian Geologist (TAG)'' – quarterly magazine that includes technical ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gondwana
Gondwana ( ; ) was a large landmass, sometimes referred to as a supercontinent. The remnants of Gondwana make up around two-thirds of today's continental area, including South America, Africa, Antarctica, Australia (continent), Australia, Zealandia, Arabian Peninsula, Arabia, and the Indian subcontinent. Gondwana was formed by the Accretion (geology), accretion of several cratons (large stable blocks of the Earth's crust), beginning with the East African Orogeny, the collision of India and Geography of Madagascar, Madagascar with East Africa, and culminating in with the overlapping Brasiliano orogeny, Brasiliano and Kuunga orogeny, Kuunga orogenies, the collision of South America with Africa, and the addition of Australia and Antarctica, respectively. Eventually, Gondwana became the largest piece of continental crust of the Paleozoic Era, covering an area of some , about one-fifth of the Earth's surface. It fused with Laurasia during the Carboniferous to form Pan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geological period of the entire Phanerozoic. The name is derived from the Latin , 'chalk', which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation . The Cretaceous was a period with a relatively warm climate, resulting in high Sea level#Local and eustatic, eustatic sea levels that created numerous shallow Inland sea (geology), inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was largely ice-free, although there is some evidence of brief periods of glaciation during the cooler first half, and forests extended to the poles. Many of the dominant taxonomic gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Challenger Plateau
The Challenger Plateau is a large submarine plateau west of New Zealand and south of the Lord Howe Rise. It has an approximate diameter of and an area of about . The water depth over the plateau varies between to and is covered by up to of sedimentary rocks of Upper Cretaceous to recent in age. The plateau originated in the Gondwanan breakup and is one of the five major submerged parts of Zealandia, a largely submerged continent A continent is any of several large geographical regions. Continents are generally identified by convention (norm), convention rather than any strict criteria. A continent could be a single large landmass, a part of a very large landmass, as .... References Geography of the New Zealand seabed Plateaus of the Pacific Ocean Zealandia {{marine-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rift
In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-graben with normal faulting and rift-flank uplifts mainly on one side. Where rifts remain above sea level they form a rift valley, which may be filled by water forming a rift lake. The axis of the rift area may contain volcanic rocks, and active volcanism is a part of many, but not all, active rift systems. Major rifts occur along the central axis of most mid-ocean ridges, where new oceanic crust and lithosphere is created along a divergent boundary between two tectonic plates. ''Failed rifts'' are the result of continental rifting that failed to continue to the point of break-up. Typically the transition from rifting to spreading develops at a triple junction where three converging rifts meet over a hotspot. Two of these evolve to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tasman Sea
The Tasman Sea is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about across and about from north to south. The sea was named after the Dutch explorer Abel Janszoon Tasman, who in 1642 was the first known person to cross it. British explorer Lieutenant James Cook later extensively navigated the Tasman Sea in the 1770s during his three voyages of exploration. The Māori people of New Zealand call this sea ''Te Moana-a-Rehua'' meaning 'the sea of Rehua' which clashes with the Pacific waters named ''Te Tai-o-Whitirea'' ('the sea of Whitirea') – after Whitirea, Rehua's lover – at Cape Reinga, the northernmost tip of North Island. Climate The south of the sea is passed over by depressions going from west to east. The northern limit of these westerly winds is near to 40th parallel south, 40°S. During the southern winter, from April to October, the northern branch of these winds from the west changes its direction toward th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
