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Il Gruppo di Chilcotin, o basalti del Plat … Il Gruppo di Chilcotin, o basalti del Plateau Chilcotin, è una vasta area di lava basaltica che forma un plateau vulcanico parallelo alla cintura vulcanica Garibaldi, nella parte centro-meridionale della Columbia Britannica, in Canada. Nel Miocene e Pliocene, nell'Interior Plateau della Columbia Britannica si formò un campo vulcanico di medie dimensioni con camini vulcanici in parziale sovrapposizione tra loro. Si ritiene che fossero interessati circa 50.000 km2 del Nord-ovest Pacifico, dando luogo a una grande provincia ignea con un volume di 3.300 km3. Il vulcanismo si attivò nell'Oligocene, ma continua sporadicamente anche al giorno d'oggi. Le eruzioni furono particolarmente intense 10-6 milioni di anni fa e successivamente 3-2 milioni di anni fa, quando fu rilasciata la maggior parte del basalto. Eruzioni meno intense avvennero tra 1,6 milioni e 10.000 anni fa. I flussi di lava sono stati esposti prevalentemente dall'erosione provocata dalle grandi inondazioni che avvennero in questa regione durante le passate ere glaciali, che hanno lasciato scoperti molti strati basaltici lungo il Canyon Fraser, a partire dal villaggio di Soda Cerek in direzione sud verso Canoe Creek e lungo i fiumi Chilcotin, Chilko, Chilanko e Taseko; inoltre a est del fiume Fraser nel Parco Provinciale Chasm e lungo il fiume Deadman. Prima dell'erosione del tardo Pleistocene, questi centri formavano una serie di bassi vulcani a scudo di cui non è noto il volume e la distribuzione. Il gruppo di Chilcotin era ritenuto collegato al parzialmente coevo Gruppo basaltico del fiume Columbia. La sua morfologia e geochimica sono risultate molto simili a altri plateau vulcanici come la Snake River Plain nell'Idaho e parti dell'Islanda.ver Plain nell'Idaho e parti dell'Islanda.
, The Chilcotin Group, also called the Chilc … The Chilcotin Group, also called the Chilcotin Plateau Basalts, is a large area of basaltic lava that forms a volcanic plateau running parallel with the Garibaldi Volcanic Belt in south-central British Columbia, Canada. Predominantly, during Miocene and Pliocene times, a medium-sized volcanic field of overlapping vents occurred in British Columbia's Interior Plateau. The distribution is assumed to engulf up to 50,000 km2 of the Pacific Northwest, forming a medium-sized large igneous province, of volume 3300 km3. Volcanism occurred as late as Oligocene time, but continues sporadically up to present. Eruptions were most vigorous 6-10 million years ago and 2-3 million years ago, when most of the basalt was released. Less extensive eruptions continued 0.01 to 1.6 million years ago. These lava flows have been dominantly exposed by erosion resulting from the great floods that flowed in this region throughout the past ice ages, which laid bare many layers of the basalt flows along the Fraser Canyon from Soda Creek south to Canoe Creek elsewhere along the Chilcotin, Chilko, Chilanko and Taseko Rivers, and also to the east of the Fraser River at Chasm Provincial Park and along the Upper Deadman River. Prior to Late Pleistocene glacial erosion these centers formed a series of coalesced, low-profile shield volcanoes of unknown volume and distribution. The Chilcotin Group were thought to potentially be linked to the partly coeval Columbia River Basalt Group. However, its morphology and geochemistry have been proven much similar to other volcanic plateaus such as the Snake River Plain in Idaho and parts of Iceland (Bevier, 1983).Idaho and parts of Iceland (Bevier, 1983).
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The Chilcotin Group, also called the Chilc … The Chilcotin Group, also called the Chilcotin Plateau Basalts, is a large area of basaltic lava that forms a volcanic plateau running parallel with the Garibaldi Volcanic Belt in south-central British Columbia, Canada. The Chilcotin Group were thought to potentially be linked to the partly coeval Columbia River Basalt Group. However, its morphology and geochemistry have been proven much similar to other volcanic plateaus such as the Snake River Plain in Idaho and parts of Iceland (Bevier, 1983).Idaho and parts of Iceland (Bevier, 1983).
, Il Gruppo di Chilcotin, o basalti del Plat … Il Gruppo di Chilcotin, o basalti del Plateau Chilcotin, è una vasta area di lava basaltica che forma un plateau vulcanico parallelo alla cintura vulcanica Garibaldi, nella parte centro-meridionale della Columbia Britannica, in Canada. Il gruppo di Chilcotin era ritenuto collegato al parzialmente coevo Gruppo basaltico del fiume Columbia. La sua morfologia e geochimica sono risultate molto simili a altri plateau vulcanici come la Snake River Plain nell'Idaho e parti dell'Islanda.ver Plain nell'Idaho e parti dell'Islanda.
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Gruppo di Chilcotin
, Chilcotin Group
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