Английская Википедия:Cerro Archibarca
Шаблон:Coord Cerro Archibarca is a volcano in the Andes. It covers a surface area of Шаблон:Convert. Lava flows descend from a conical edifice.Шаблон:Rp[1] It was active 11 million years ago.[2] The youngest deposits are eroded andesites on the northern side.[3]
A major volcaniclastic unit is associated with Archibarca, named the La Torre formation after the valley where its lower bright red unit reaches a thickness of Шаблон:Convert. The red unit is formed from unconsolidated pyroclastics with spherical clasts (Шаблон:Convert up to Шаблон:Convert). Granite and pumice are materials also present in this unit. The upper white unit is a thick pyroclastic flow from Archibarca. A Шаблон:Convert thick rhyolitic flow with banding structures is also present as well as an associated lava dome that intruded the La Torre formation on the volcano's southern side.[3]
Andesites from this volcano are partly derived from crustal assimilation, with the crustal component constituting 40% of total rock.Шаблон:Rp[1] The Caballo Muerto and Archibarca ignimbrites may be derived from this volcano.[4]
References
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
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; для сносокKraemer1999
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; для сносокRichardsUllrich2006
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; для сносокAlonsoSEGEMAR
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; для сносокSchnurrTrumbull2007
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