Continents and Supercontinents

Rogers, John J. W.; Santosh, M.

doi:10.1016/s1342-937x(05)70827-3

Cited by 153 publications

(117 citation statements)

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“…The active continental margins were characterized by long-lived (1.8-1.3 Ga), subduction-related outward accretion, as evidenced by 1.8-1.3 Ga magmatic arcs covering the present southern and southeastern margins of Laurentia, the southern margin of Baltica, the northwestern margin of Amazonia, the southern and eastern margins of the North Australia Craton, and the southern margin of the North China Craton. These sites are characterized by juvenile volcanogenic sequences and granitoid suites resembling those of present-day island arcs and active continental margins (Geraldes et al, 2001;Karlstrom et al, 2001;Zhao et al, 2002aZhao et al, ,b, 2009Rogers and Santosh, 2004;Hou et al, 2008;He et al, 2008He et al, , 2009He et al, , 2010aHe et al, , 2010bSantosh, 2010). The passive continental margins were marked by large-scale extension, as indicated by 1.80-1.75 Ga continental rifting and anorogenic magmatism evident in the Yangtze Craton and other blocks of the Columbia supercontinent (Rogers and Santosh, 2002;Zhao et al, 2004;Kröner et al, 2006;Hou et al, 2008;Peng et al, 2010).…”

Section: Relation To the Assembly Of The Columbia Supercontinentmentioning

confidence: 98%

Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: Implications for the reconstruction of the Columbia supercontinent

Long

Sun

Yuan

et al. 2012

Precambrian Research

127

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Section: Relation To the Assembly Of The Columbia Supercontinentmentioning

confidence: 98%

Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: Implications for the reconstruction of the Columbia supercontinent

Long

Sun

Yuan

et al. 2012

Precambrian Research

127

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“…East Antarctica is considered as a stable, cratonic block with a Precambrian basement and has prominently figured in Proterozoic configurations of supercontinents including Columbia, Rodinia and Gondwana (e.g., Dalziel 1991;Borg & DePaolo 1994;Rogers et al 1995;Rogers & Santosh 2004Meert & Lieberman 2008;Satish-Kumar et al 2008;Santosh, Maruyama & Sato 2009;Santosh, Maruyama & Yamamato 2009;Boger 2011). Central Dronning Maud Land in East Antarctica comprises mainly high-grade metamorphic rocks intruded by voluminous igneous bodies that form coastal and inland mountainous outcrops (Dallmann et al 1990).…”

Section: Geological Backgroundmentioning

confidence: 99%

Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Murthy

Veeraswamy²,

Harinarayana³

et al. 2013

Polar Research

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Maitri Station (70.76°S; 11.73°E) is located in Schirmacher Oasis, a coastal nunatak in north-central Dronning Maud Land covering an area of 35 km2. Here, we report results from the first magnetotelluric experiments and delineate the deep electrical conductivity structure under Schirmacher Oasis using the data acquired during the 24th Indian Antarctic Scientific Expedition. The magnetotelluric method has the advantage of shallow to deeper level coverage as the data acquisition covers a wide frequency band of 10−3–103 Hz, permitting different penetration depths depending on the frequency and conductivity of the layer under investigation. The modelling results indicate the presence of a highly resistive (8000–10 000 ohm m) upper crust, which shows a lateral variation in thickness from 20 km (below site 6) in the east to 10 km (between sites 1 and 2) in the west. It is underlain by a less resistive (500–600 ohm m) lower crust. The highly resistive upper crustal structure supports the existing notion that western Dronning Maud Land is a stable, cratonic platform. Results of free-air gravity, seismic, geomagnetic and surface wave dispersion investigations in East Antarctica also indicate a cratonic-type crust. The results of our study allow us to identify a westward thinning of the upper crust with a marked boundary between sites 1 and 2. We also find evidence for the continuity of the Mozambique mobile belt in East Antarctica on the western side of Schirmacher Oasis

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“…de um lado das montanhas (chuvas orográficas); os centros das grandes massas continentais geralmente têm elevações relativamente altas e, consequentemente, são regiões secas e frescascondição conhecida como continentalidade (Rogers & Santosh 2004).…”

Section: Movimentação Tectônicaunclassified

Ciclos climáticos e causas naturais das mudanças do clima

et al. 2018

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TerraeDid atic a IntroduçãoA presente histeria sobre aquecimento global -com a previsão apocalíptica de fusão das calotas de gelo polar, inundação de cidades costeiras e desertificação de zonas produtoras de alimentos -não ajuda os cidadãos a compreender as forças reais e complexas que moldam o clima da Terra (Hecht 1993(Hecht -1994.Tentar entender o clima tem sido prática de sobrevivência desde os primórdios da humanidade. Inegavelmente, compreender o momento ideal do plantio e da colheita fez parte das técnicas da agricultura primitiva que permitiram ao homem a transição do nomadismo para o sedentarismo. Assim, a partir da constatação da óbvia alternância entre o dia e a noite, da observação das fases da Lua, da dedução das estações do ano, foi-se descobrindo a estreita relação entre esses fenômenos (cíclicos e de origem astronômica) com as alterações do clima na Terra (também de caráter periódico). ABSTRACT:The periodic nature of climate changes on the Earth can be explained in terms of a limited number of terrestrial and astronomical factors. In annual/daily scales, the climate varies according to the Earth's revolution and rotation. Medium term climate cycles (decades/centuries/millennia) are related to changes in solar radiation caused by the influences of major planets of the Solar System. Oceanic oscillations (decadal order) are possibly caused by the planetary and lunar influences. Long term climate cycles (tens and hundreds of thousand years) are caused by variations in the parameters of Earth's orbit (eccentricity, obliquity and precession). Impact events of large bodies on the planet and mass extinction arise from supercycles (tens of millions of years) caused by the vertical oscillation of the solar system relative to the galactic plane. Tectonics, volcanism and the evolution of supercontinents exhibit supercycles (hundreds of million years) induced by the Solar System movement around the Milky Way center and by the cosmic rays variation. Astronomical factors permeate virtually all the climate cycles orders, acting directly or indirectly in many bio-geo-oceanic-atmospheric processes. It is concluded that the Earth's climate is characterized by cycles astronomically controlled by the Moon, the Sun, the planets, the Solar System and even the Galaxy. Ciclos climáticos e causas naturais das mudanças do clima

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Continents and Supercontinents

Cited by 153 publications

References 0 publications

Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: Implications for the reconstruction of the Columbia supercontinent

Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: Implications for the reconstruction of the Columbia supercontinent

Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Ciclos climáticos e causas naturais das mudanças do clima

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