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Carrizalillo (caldera) : ウィキペディア英語版
Carrizalillo (caldera)
Carrizalillo is a caldera in Chile. It is located in the Central Volcanic Zone and is part of the Paleocene-Eocene volcanic belt.〔 The caldera is located southwest of Copiapo.〔 It is heavily eroded.〔 Active during the Cretaceous, it is a large caldera. Postcollapse activity generated subsidiary calderas inside the older main caldera.
== Geology ==
The caldera has dimensions of with a northnortheast axis.〔 The caldera has a surface area of , bounded by the Quebrada San Miguel to the north and Lomas Bayas in the south. Two fault zones La Ternera and San Antonio cut the caldera.〔 Inside the caldera thick layers of lava, pyroclastic flows and sediments. A pluton, Cabeza de Vaca, lies in the southern and eastern sectors of the caldera and has dimensions of . Within the caldera several smaller calderas formed, from north to south Caldera Cerro Puquios, Caldera Bellavista, Caldera Agua Nueva, Caldera El Durazno and Caldera Lomas Bayas. The Puquios caldera partly overlaps the Carrizalillo caldera margin. These subsidiary calderas have left lava conduits, lacustrine and intrusive structures and other geomorphologic features.〔 The caldera is constructed in the terrain of the San Antonio formation, which forms megabreccia in the caldera.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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