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De Anahimhotspot is een vulkanische hotspot in Centraal-Brits-Columbia, Canada. Hij is gelegen onder het : een groot gebied dat begrensd wordt door de en de Monashee Mountains in het oosten en de , Coast Mountains en Cascade Range in het westen.
, Titik panas Anahim adalah titik panas vulk … Titik panas Anahim adalah titik panas vulkanik yang terletak di pedalaman bagian barat British Columbia, Kanada; salah satu dari sedikit titik panas di Amerika Utara. Mantel bulu Anahim berpengaruh dalam pembentukan . Titik panas Anahim merupakan rangkaian panjang gunung berapi yang membentang di sepanjang 300 km (190 mil) gunung berapi dengan fitur magmatik yang telah mengalami erosi. Rantai ini terbentang dari kawanan pegunungan Bella Bella di barat, hingga dekat kota kecil Quesnel di timur. Sebagian besar gunung berapi dibentuk oleh aktivitas geologi pada batas lempeng tektonik; dan titik panas Anahim terletak ratusan kilometer dari batas lempeng terdekat. Keberadaan titik panas ini, pertama kali diajukan oleh tiga ilmuwan pada tahun 1970-an. Mereka menggunakan teori klasik titik panas John Tuzo Wilson. Teori ini mengusulkan bahwa sebuah mantel tunggal yang kokoh dapat membangun gunung berapi yang kemudian terputus dari rangkaian asalnya akibat pergeseran Lempeng Amerika Utara, sehingga menjadi tidak aktif dan pada akhirnya mengalami pengikisan selama jutaan tahun. Teori terkini, yang diterbitkan pada tahun 2001 oleh Geological Society of America, menunjukkan bahwa titik panas Anahim dipasok oleh mantel bulu yang berasal dari mantel hulu, bukan oleh mantel dalam (deep-seated plume) seperti yang diajukan oleh Wilson. Sebagaimana yang pernah dicitrakan secara tomografi, titik panas ini memiliki kedalaman sekitar 400 km (250 mil). Pengukuran ini sering kali diremehkan, seperti halnya mantel bulu karena berasal dari lapisan Bumi bagian dalam. Fenomena Gunung berapi yang terjadi 14,5 juta tahun lalu berhubungan dengan pembentukan titik panas Anahim, yang terakhir kali mengalami erupsi pada 8.000 tahun terakhir. Aktivitas vulkanik ini telah menghasilkan batuan yang menunjukkan distribusi bimodal. Batuan ini mengalami pengendapan, sehingga titik panas terbentuk seiring dengan periode peningkatan dan pengerasan kerak. Aktivitas Gunung berapi di zaman modern terbatas pada gempa bumi dan emisi gas vulkanik.as pada gempa bumi dan emisi gas vulkanik.
, The Anahim hotspot is a hypothesized hotsp … The Anahim hotspot is a hypothesized hotspot in the Central Interior of British Columbia, Canada. It has been proposed as the candidate source for volcanism in the Anahim Volcanic Belt, a 300 kilometres (190 miles) long chain of volcanoes and other magmatic features that have undergone erosion. This chain extends from the community of Bella Bella in the west to near the small city of Quesnel in the east. While most volcanoes are created by geological activity at tectonic plate boundaries, the Anahim hotspot is located hundreds of kilometres away from the nearest plate boundary. The hotspot was first proposed in the 1970s by three scientists who used John Tuzo Wilson's classic hotspot theory. This theory proposes that a single, fixed mantle plume builds volcanoes that then, cut off from their source by the movement of the North American Plate, become increasingly inactive and eventually erode over millions of years. A more recent theory, published in 2001 by the Geological Society of America, suggests that the Anahim hotspot might be supplied by a mantle plume from the upper mantle rather than a deep-seated plume proposed by Wilson. Tomographic imaging has since identified a low-velocity anomaly, indicative of an upwelling plume, that measures roughly 400 kilometres (250 miles) deep. This measurement, however, could be an underestimate as the anomaly might originate deeper inside Earth. Volcanism as early as 14.5 million years ago has been linked to the Anahim hotspot, with the latest eruption having taken place in the last 8,000 years. This volcanic activity has produced rocks that show a bimodal distribution in composition. While these rocks were being deposited, the hotspot coincided with periods of crustal extension and uplift. Activity in modern times has been limited to earthquakes and volcanic gas emissions.to earthquakes and volcanic gas emissions.
, Le point chaud d'Anahim, en anglais : Anah … Le point chaud d'Anahim, en anglais : Anahim hotspot, est un point chaud situé sur le plateau intérieur dans le centre de la Colombie-Britannique, au Canada. Son nom provient de la ceinture volcanique d'Anahim, un ensemble de cinq structures volcaniques qu'il a engendrées :
* deux ensembles de dykes, les dykes Bella Bella et les dykes Gale Passage ;
* le chaînon Rainbow actif il y a 8 millions d'années ;
* le chaînon Ilgachuz actif il y a 5 millions d'années ;
* le chaînon Itcha actif il y a 2,5 millions d'années avec trois cônes annexes actifs il y a 1,6 million d'années et 10 000 ans ;
* le cône Nazko actif il y a entre 340 000 et 10 000 ans. La plaque nord-américaine se déplaçant de 11,5 à 20 millimètres par an en direction de l'ouest-sud-ouest, le point chaud se trouve encore sous le cône Nazco bien que celui-ci n'ait pas connu d'éruptions depuis quelques milliers d'années.
* Portail du volcanisme
* Portail de la Colombie-Britanniqueisme
* Portail de la Colombie-Britannique
, Il punto caldo di Anahim è un punto caldo … Il punto caldo di Anahim è un punto caldo situato nella parte centro-occidentale della Columbia Britannica, nella parte occidentale del Canada. Si tratta di uno dei pochi punti caldi del Nord America, che ha causato la formazione della cintura vulcanica di Anahim, una catena lunga circa 300 km costituita da vulcani e altre formazioni magmatiche che sono andate incontro a erosione nel corso del tempo. La catena si estende dalla comunità di a ovest fino alla cittadina di Quesnel a est. Anche se la maggior parte dei vulcani sono il frutto dell'attività geologica ai margini delle placche tettoniche, il punto caldo di Anahim è situato a centinaia di chilometri di distanza dal margine tettonico più vicino. L'esistenza del punto caldo fu proposta negli anni 1970 in base della classica ipotesi di John Tuzo Wilson, in base alla quale un singolo e fisso pennacchio del mantello aveva dato luogo alla formazione di una serie di vulcani che, quando la loro sorgente di alimentazione ha cominciato ad esaurirsi in seguito al movimento della placca nordamericana, sono diventati progressivamente inattivi e quindi sono andati incontro ad un processo di erosione nel corso di milioni di anni. Un'ipotesi più recente, pubblicata nel 2001 dalla Geological Society of America, suggerisce che il punto caldo di Anahim sia stato alimentato da un pennacchio del mantello superiore, invece che da un pennacchio di profondità come teorizzato da Wilson. È stata elaborata anche un'immagine tomografica del pennacchio, che mostra che esso si trova ad una profondità di circa 400 km. Questa misura potrebbe tuttavia essere sottostimata in quanto è possibile che il pennacchio si origini a profondità maggiori. Un'attività vulcanica risalente a 14,5 milioni di anni fa è stata associata al punto caldo di Anahim, con l'ultima eruzione avvenuta attorno a 8.000 anni fa. Questo vulcanismo ha prodotto rocce che mostrano una distribuzione di composizione bimodale. Nel periodo di deposizione di queste rocce, la crosta terrestre era in fase estensionale e di sollevamento tettonico. In periodi successivi l'attività del punto caldo si è evidenziata solo sotto forma di terremoti e emissioni vulcaniche gassose. terremoti e emissioni vulcaniche gassose.
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The Anahim hotspot is a hypothesized hotsp … The Anahim hotspot is a hypothesized hotspot in the Central Interior of British Columbia, Canada. It has been proposed as the candidate source for volcanism in the Anahim Volcanic Belt, a 300 kilometres (190 miles) long chain of volcanoes and other magmatic features that have undergone erosion. This chain extends from the community of Bella Bella in the west to near the small city of Quesnel in the east. While most volcanoes are created by geological activity at tectonic plate boundaries, the Anahim hotspot is located hundreds of kilometres away from the nearest plate boundary.tres away from the nearest plate boundary.
, Il punto caldo di Anahim è un punto caldo … Il punto caldo di Anahim è un punto caldo situato nella parte centro-occidentale della Columbia Britannica, nella parte occidentale del Canada. Si tratta di uno dei pochi punti caldi del Nord America, che ha causato la formazione della cintura vulcanica di Anahim, una catena lunga circa 300 km costituita da vulcani e altre formazioni magmatiche che sono andate incontro a erosione nel corso del tempo. La catena si estende dalla comunità di a ovest fino alla cittadina di Quesnel a est. Anche se la maggior parte dei vulcani sono il frutto dell'attività geologica ai margini delle placche tettoniche, il punto caldo di Anahim è situato a centinaia di chilometri di distanza dal margine tettonico più vicino.distanza dal margine tettonico più vicino.
, Titik panas Anahim adalah titik panas vulk … Titik panas Anahim adalah titik panas vulkanik yang terletak di pedalaman bagian barat British Columbia, Kanada; salah satu dari sedikit titik panas di Amerika Utara. Mantel bulu Anahim berpengaruh dalam pembentukan . Titik panas Anahim merupakan rangkaian panjang gunung berapi yang membentang di sepanjang 300 km (190 mil) gunung berapi dengan fitur magmatik yang telah mengalami erosi. Rantai ini terbentang dari kawanan pegunungan Bella Bella di barat, hingga dekat kota kecil Quesnel di timur. Sebagian besar gunung berapi dibentuk oleh aktivitas geologi pada batas lempeng tektonik; dan titik panas Anahim terletak ratusan kilometer dari batas lempeng terdekat.san kilometer dari batas lempeng terdekat.
, De Anahimhotspot is een vulkanische hotspot in Centraal-Brits-Columbia, Canada. Hij is gelegen onder het : een groot gebied dat begrensd wordt door de en de Monashee Mountains in het oosten en de , Coast Mountains en Cascade Range in het westen.
, Le point chaud d'Anahim, en anglais : Anah … Le point chaud d'Anahim, en anglais : Anahim hotspot, est un point chaud situé sur le plateau intérieur dans le centre de la Colombie-Britannique, au Canada. Son nom provient de la ceinture volcanique d'Anahim, un ensemble de cinq structures volcaniques qu'il a engendrées : La plaque nord-américaine se déplaçant de 11,5 à 20 millimètres par an en direction de l'ouest-sud-ouest, le point chaud se trouve encore sous le cône Nazco bien que celui-ci n'ait pas connu d'éruptions depuis quelques milliers d'années.
* Portail du volcanisme
* Portail de la Colombie-Britanniqueisme
* Portail de la Colombie-Britannique
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Titik panas Anahim
, Anahim hotspot
, Anahimhotspot
, Punto caldo di Anahim
, Point chaud d'Anahim
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