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Žilný roj je geologický pojem a představuj … Žilný roj je geologický pojem a představuje celistvý systém paralelně, lineárně či radiálně orientovaných pravých žil, vytlačených do pevninské kůry a uvízlých pod zemským povrchem. Skládá se z několika až stovek pravých žil, které byly vytlačeny do pevninské kůry ve stejném časovém období v rámci jedné intruze, jsou magmatického původu a mají stratigrafické uspořádání. Takovéto žilné roje mohou tvořit rozsáhlé magmatické provincie, které jsou součástmi provincií vulkanických. Výskyt mafických žilných rojů v archeánských a paleoproterozoických je často spojován s přítomností plášťových chocholů, které jsou obvykle doprovázeny abnormálně vysokými teplotami v zemském plášti. Žilné roje mohou mít rozlohu až 400 km na šířku a délku. Nejrozsáhlejší žilný roj na Zemi je v kanadské provincii Severozápadních teritorií, který je více než 500 km široký a 3 000 km dlouhý. Podobně rozsáhlých žilných rojů na Zemi je málo, přibližně kolem dvaceti pěti. Jejich geometrické tvary však nejsou s určitostí známy, protože jsou měněny nebo kompletně ničeny deskovou tektonikou.nebo kompletně ničeny deskovou tektonikou.
, Uno sciame di dicchi è una vasta struttura … Uno sciame di dicchi è una vasta struttura geologica che consiste di una serie di dicchi orientati in senso parallelo, lineare o radiale, intrusi all'interno della crosta continentale. Uno sciame può essere composto anche da centinaia di dicchi formatasi più o meno contemporaneamente durante un singolo evento intrusivo ed hanno rilevanza sia dal punto di vista magmatico che stratigrafico. Gli sciami di dicchi possono concorrere alla formazione di una grande provincia ignea e rappresentano le radici di una provincia vulcanica. L'esistenza di sciami di dicchi mafici nei terreni risalenti all'Archeano e al Paleoproterozoico vengono citati come evidenza dell'attività di un mantle plume, o pennacchio del mantello, associata a temperature del mantello terrestre abnormalmente elevate. Gli sciami di dicchi si possono estendere anche per di più di 400 km sia in lunghezza che in larghezza. Il più esteso è lo sciame di dicchi Mackenzie, situato nella porzione occidentale dello scudo canadese, che ha una larghezza di oltre 500 km e si estende in lunghezza per circa 3.000 km. Il numero dei grandi sciami di dicchi conosciuti sulla Terra è limitato a circa 25. La geometria primaria di queste grandi strutture primarie è tuttora poco conosciuta a causa dell'età della loro formazione e della conseguente lunga attività tettonica che li ha modificati o erosi. Sciami di dicchi sono stati recentemente scoperti anche sui pianeti Venere e Marte.scoperti anche sui pianeti Venere e Marte.
, A dike swarm (American spelling) or dyke s … A dike swarm (American spelling) or dyke swarm (British spelling) is a large geological structure consisting of a major group of parallel, linear, or radially oriented magmatic dikes intruded within continental crust or in rift zones. Examples exist in Iceland and near other large volcanoes, (stratovolcanoes, calderas, shield volcanoes and other ) around the world. They consist of several to hundreds of dikes emplaced more or less contemporaneously during a single intrusive event, are magmatic and stratigraphic, and may form a large igneous province. The occurrence of mafic dike swarms in Archean and Paleoproterozoic terrains is often cited as evidence for mantle plume activity associated with abnormally high mantle potential temperatures. Dike swarms may extend over 400 km (250 mi) in width and length. The largest dike swarm known on Earth is the Mackenzie dike swarm in the western half of the Canadian Shield in Canada, which is more than 500 km (310 mi) wide and 3,000 km (1,900 mi) long. About 25 giant dike swarms are known on Earth. The primary geometry of most giant dike swarms is poorly known due to their old age and subsequent tectonic activity. Dike swarms have also been found on Venus and Mars.ms have also been found on Venus and Mars.
, 岩墙群是一种厚度比较稳定的近直立的板状岩浆侵入体的集合体。作为超大陆初始裂解的标志， … 岩墙群是一种厚度比较稳定的近直立的板状岩浆侵入体的集合体。作为超大陆初始裂解的标志，岩墙群在全球超级大陆恢复重建研究中越来越得到高度重视。尤其，陆缘放射状（或扇状）分布的岩墙群及其在超大陆裂解中的大地构造作用成为前寒武纪地质研究的前沿热点课题。在古大陆对比和超大陆再造研究中陆缘的放射状岩墙群比陆内平行分布的岩墙群更具有对比意义。 在全球各大克拉通内广泛发育前寒武纪岩墙群，主要以晚前寒武纪基性岩墙群为主。与超大陆裂解事件相关的基性岩墙群一般宽数十米至数百米，长数十公里至数百公里，甚至上千公里，绝大多数晚前寒武纪岩墙群未变形变质。世界上最大的放射状（扇形分布）基性岩墙群是加拿大地盾1.27 Ga的馬更些岩墙群，长度达2000公里以上，扇形夹角100°，岩墙群焦点在加拿大北部的同时代的科珀曼河溢流玄武岩区，两者构成世界著名的与地幔柱相关的大岩浆省（Ernst et al., 1992, 1995, 2005）。 目前已知的大型岩牆群只有25個。大多數幾何狀的大型岩牆群被板塊運動摧毀，所以我們對它的認識不足。 世界上著名的岩墙群学家以加拿大的Halls教授和Ernst博士为代表，中国的岩墙群学家以侯贵廷教授和彭澎博士为代表人物。lls教授和Ernst博士为代表，中国的岩墙群学家以侯贵廷教授和彭澎博士为代表人物。
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Žilný roj je geologický pojem a představuj … Žilný roj je geologický pojem a představuje celistvý systém paralelně, lineárně či radiálně orientovaných pravých žil, vytlačených do pevninské kůry a uvízlých pod zemským povrchem. Skládá se z několika až stovek pravých žil, které byly vytlačeny do pevninské kůry ve stejném časovém období v rámci jedné intruze, jsou magmatického původu a mají stratigrafické uspořádání. Takovéto žilné roje mohou tvořit rozsáhlé magmatické provincie, které jsou součástmi provincií vulkanických.eré jsou součástmi provincií vulkanických.
, A dike swarm (American spelling) or dyke s … A dike swarm (American spelling) or dyke swarm (British spelling) is a large geological structure consisting of a major group of parallel, linear, or radially oriented magmatic dikes intruded within continental crust or in rift zones. Examples exist in Iceland and near other large volcanoes, (stratovolcanoes, calderas, shield volcanoes and other ) around the world. They consist of several to hundreds of dikes emplaced more or less contemporaneously during a single intrusive event, are magmatic and stratigraphic, and may form a large igneous province.ic, and may form a large igneous province.
, Uno sciame di dicchi è una vasta struttura … Uno sciame di dicchi è una vasta struttura geologica che consiste di una serie di dicchi orientati in senso parallelo, lineare o radiale, intrusi all'interno della crosta continentale. Uno sciame può essere composto anche da centinaia di dicchi formatasi più o meno contemporaneamente durante un singolo evento intrusivo ed hanno rilevanza sia dal punto di vista magmatico che stratigrafico. Gli sciami di dicchi possono concorrere alla formazione di una grande provincia ignea e rappresentano le radici di una provincia vulcanica.tano le radici di una provincia vulcanica.
, 岩墙群是一种厚度比较稳定的近直立的板状岩浆侵入体的集合体。作为超大陆初始裂解的标志， … 岩墙群是一种厚度比较稳定的近直立的板状岩浆侵入体的集合体。作为超大陆初始裂解的标志，岩墙群在全球超级大陆恢复重建研究中越来越得到高度重视。尤其，陆缘放射状（或扇状）分布的岩墙群及其在超大陆裂解中的大地构造作用成为前寒武纪地质研究的前沿热点课题。在古大陆对比和超大陆再造研究中陆缘的放射状岩墙群比陆内平行分布的岩墙群更具有对比意义。 在全球各大克拉通内广泛发育前寒武纪岩墙群，主要以晚前寒武纪基性岩墙群为主。与超大陆裂解事件相关的基性岩墙群一般宽数十米至数百米，长数十公里至数百公里，甚至上千公里，绝大多数晚前寒武纪岩墙群未变形变质。世界上最大的放射状（扇形分布）基性岩墙群是加拿大地盾1.27 Ga的馬更些岩墙群，长度达2000公里以上，扇形夹角100°，岩墙群焦点在加拿大北部的同时代的科珀曼河溢流玄武岩区，两者构成世界著名的与地幔柱相关的大岩浆省（Ernst et al., 1992, 1995, 2005）。 目前已知的大型岩牆群只有25個。大多數幾何狀的大型岩牆群被板塊運動摧毀，所以我們對它的認識不足。 世界上著名的岩墙群学家以加拿大的Halls教授和Ernst博士为代表，中国的岩墙群学家以侯贵廷教授和彭澎博士为代表人物。lls教授和Ernst博士为代表，中国的岩墙群学家以侯贵廷教授和彭澎博士为代表人物。
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, Žilný roj
, Dike swarm
, 岩墙群
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