|
Mawson (continent)
The Mawson Continent (or Mawson Block, Mawson Craton) was a continent that may have formed around about 1730 Ma (1,730 million years ago). It included the Gawler craton of southern Australia and correlated terrains in Antarctica. Since very little of the historical continent is exposed, the full extent is conjectural. Gawler–Adélie Craton The Gawler craton and Terre Adélie craton share late Archean and early Proterozoic tectono-thermal events, and may be considered to be a single terrain from the Archean until rifting in the Cretaceous. There are correlatable timelines between the Gawler–Adélie Craton, Curnamona Province and North Australian Craton around 2500–2430 Ma, 2000 Ma, 1865–1850 Ma, 1730–1690 Ma and 1600–1550 Ma. It is therefore plausible that throughout the Paleoproterozoic the Gawler– Adélie Craton and North Australian Craton were joined into a single continental terrain. Formation of Mawson Continent The Mawson Continent seems to have formed durin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 in the case of Asia or Europe within Eurasia, or a landmass and nearby islands within its continental shelf. Due to these varying definitions, the number of continents varies; up to seven or as few as four geographical regions are commonly regarded as continents. Most English-speaking world, English-speaking countries recognize seven regions as continents. In order from largest to smallest in area, these seven regions are Asia, Africa, North America, South America, Antarctica, Europe, and Australia (continent), Australia (sometimes called Oceania or Australasia). Different variations with fewer continents merge some of these regions; examples of this are merging Asia and Europe into Eurasia, "Most people recognize seven continents—Asia, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kimban Orogeny
The Kimban orogeny, also termed the Strangways orogeny, affected the Gawler craton in what is now Australia between 1.73 and 1.69 billion years ago in the Proterozoic. As the most widespread orogenic event in the craton's evolution, the Kimban orogeny led to widely variable metamorphism included granulite and greenschist-grade on the sequence of metamorphic facies, preserved in the Tunkillia, Moody and Middlecamp rock suites. The Moody Suite formed late in the orogeny and was intruded with hornblende-rich granitoids and muscovite Muscovite (also known as common mica, isinglass, or potash mica) is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl2(Al Si3 O10)( F,O H)2, or ( KF)2( Al2O3)3( SiO2)6( H2O). It has a highly perfect basal cleavage y ...-rich leucogranites. See also * List of orogenies References Orogenies of Australia Proterozoic orogenies {{Australia-geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Historical Continents
History is the systematic study of the past, focusing primarily on the human past. As an academic discipline, it analyses and interprets evidence to construct narratives about what happened and explain why it happened. Some theorists categorize history as a social science, while others see it as part of the humanities or consider it a hybrid discipline. Similar debates surround the purpose of history—for example, whether its main aim is theoretical, to uncover the truth, or practical, to learn lessons from the past. In a more general sense, the term ''history'' refers not to an academic field but to the past itself, times in the past, or to individual texts about the past. Historical research relies on primary and secondary sources to reconstruct past events and validate interpretations. Source criticism is used to evaluate these sources, assessing their authenticity, content, and reliability. Historians strive to integrate the perspectives of several sources to devel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nimrod Group (geology)
The Nimrod Islands were a group of islands first reported in 1828 by Captain Eilbeck of the ship ''Nimrod'' while sailing from Port Jackson around Cape Horn. Their reported location was east of Emerald Island and west of Dougherty Island, at approximately . They are now considered phantom islands. The explorer John Biscoe in the brig ''Tula'' searched for the Nimrod Group without success in 1831 during the Southern Ocean Expedition. John King Davis, sailing aboard a different ''Nimrod'', searched the location in June 1909 following Shackleton's famous Nimrod Expedition to Antarctica, and the Norwegian vessel ''Norvegia'' outfitted by Lars Christensen Lars Christensen (6 April 1884 – 10 December 1965) was a Norway, Norwegian shipowner and whaling magnate. He was also a philanthropist with a keen interest in the exploration of Antarctica. Career Lars Christensen was born at Sandar, Norway, S ... searched again in 1930; both expeditions reported empty seas. Captain J.P. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East Antarctic Shield
The East Antarctic Shield or Craton is a cratonic rock body that covers 10.2 million square kilometers or roughly 73% of the continent of Antarctica. The shield is almost entirely buried by the East Antarctic Ice Sheet that has an average thickness of 2200 meters but reaches up to 4700 meters in some locations. East Antarctica is separated from West Antarctica by the 100–300 kilometer wide Transantarctic Mountains, which span nearly 3,500 kilometers from the Weddell Sea to the Ross Sea. The East Antarctic Shield is then divided into an extensive central craton ( Mawson craton) that occupies most of the continental interior and various other marginal cratons that are exposed along the coast. Background Over the past 1 billion years, East Antarctica has traveled from tropical (to subtropical) southerly latitudes to its current location with the entire East Antarctic Shield positioned south of the Antarctic Circle. Despite its relative lack of motion over the past 75 million y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shackleton Range
The Shackleton Range () is a mountain range in Antarctica that rises to and extends in an east–west direction for about between the Slessor and Recovery Glaciers. Surveys The Commonwealth Trans-Antarctic Expedition (CTAE), which in 1956 saw the range from the air, conducted a ground-level survey of its western part in 1957. The United States Navy photographed the range from the air in 1967. In 1968–69 and 1969–70, the British Antarctic Survey (based at Halley Station) conducted further ground surveys with support from US Navy C-130 Hercules aircraft. The range was named after Sir Ernest Shackleton (1874–1922), leader of the British Imperial Trans-Antarctic Expedition (or "Shackleton's Expedition") of 1914–1916, the unsuccessful forerunner of the Commonwealth Trans-Antarctic Expedition (CTAE). Unofficial names include Cordillera Los Menucos, Cordon Los Menucos, Shackletonkjeda, Shackleton Mountains. Geology The range is at the northwestern edge of the East Antarc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phanerozoic
The Phanerozoic is the current and the latest of the four eon (geology), geologic eons in the Earth's geologic time scale, covering the time period from 538.8 million years ago to the present. It is the eon during which abundant animal and plant life has population growth, proliferated, evolutionary radiation, diversified and colonization (biology), colonized various ecological niche, niches on the Earth's surface, beginning with the Cambrian period when animals first developed hard shells that can be clearly preserved in the fossil record. The time before the Phanerozoic, collectively called the ''Precambrian'', is now divided into the Hadean, Archean, Archaean and Proterozoic eons. The time span of the Phanerozoic starts with the Cambrian Explosion, sudden appearance of fossilised evidence of a number of animal phylum (biology), phyla; the evolution of those phyla into diverse forms; the evolutionary history of plants, evolution of plants; the evolution of fish, arthropods ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoproterozoic
The Neoproterozoic Era is the last of the three geologic eras of the Proterozoic geologic eon, eon, spanning from 1 billion to 538.8 million years ago, and is the last era of the Precambrian "supereon". It is preceded by the Mesoproterozoic era and succeeded by the Paleozoic era of the Phanerozoic eon, and is further subdivided into three geologic period, periods, the Tonian, Cryogenian and Ediacaran. One of the most severe glaciation events known in the geologic record occurred during the Cryogenian period of the Neoproterozoic, when global ice sheets may have reached the equator and created a "Snowball Earth" lasting about 100 million years. The earliest fossils of complex life are found in the Tonian period in the form of ''Otavia'', a primitive sponge, and the earliest fossil evidence of metazoan evolutionary radiation, radiation are found in the Ediacaran period, which included the namesaked Ediacaran biota as well as the oldest definitive cnidarians and bilaterians in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transantarctic Mountains
The Transantarctic Mountains (abbreviated TAM) comprise a mountain range of uplifted rock (primarily sedimentary) in Antarctica which extends, with some interruptions, across the continent from Cape Adare in northern Victoria Land to Coats Land. These mountains divide East Antarctica and West Antarctica. They include a number of separately named mountain groups, which are often again subdivided into smaller ranges. The range was first sighted by James Clark Ross in 1841 at what was later named the Ross Ice Shelf in his honour. It was first crossed during the British National Antarctic Expedition of 1901-1904. Geography The mountain range stretches between the Ross Sea and the Weddell Sea, the entire width of Antarctica, hence the name. With a total length of about , the Transantarctic Mountains are one of the longest mountain ranges on Earth. The Antarctandes are even longer, having in common with the Transantarctic Mountains the ranges from Cape Adare to the Queen M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miller Range
The Miller Range () is a mountain range extending south from Nimrod Glacier for along the western edge of the Marsh Glacier in Antarctica. Name The range is named for J.H. "Bob", now Sir Joseph Holmes Miller, a member of the New Zealand party of the Commonwealth Trans-Antarctic Expedition (1958) who, with G.W. Marsh, mapped this area. Location The Miller Range is in the Transantarctic Mountains to the east of the Ross Ice Shelf. It runs from north to south, and is about long and up to wide. The maximum elevation above the ice sheet is about . There are signs of glaciation on the highest points of the range. The Miller Range is separated by about from the adjacent ranges of the Transantarctic Mountains by the Nimrod and Marsh glaciers. The Marsh Glacier to the east and Nimrod Glacier to the west both flow north and converge just north of the range. The Queen Elizabeth Range is east of the Miller Range, on the other side of Marsh Glacier. The Cobham Range is to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terre Adélie Craton
''S'il suffisait d'aimer'' (English: "if only love could be enough") is the sixteenth studio album by Canadian singer Celine Dion, and her eleventh French-language album. It was released by Sony Music on 31 August 1998. The album was mainly written by French singer-songwriter Jean-Jacques Goldman, and produced by Goldman and Erick Benzi. It garnered favorable reviews from music critics and became the second best-selling French-language album of all time, after Dion's own ''D'eux'' (1995). It includes three hit singles: " Zora sourit", "S'il suffisait d'aimer" and "On ne change pas". ''S'il suffisait d'aimer'' won the Juno Award for Best Selling Francophone Album of the Year. Content and promotion The project reunited Dion and Jean-Jacques Goldman, who last worked together on the very successful album ''D'eux''. In their first collaboration Goldman wrote songs for Dion, this time he wrote more in his own style, while letting Dion sing her own unique way, like she has been singing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
