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The Global Volcanism Program has no activity reports for Acamarachi.
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Acamarachi, a steep-sided andesitic-dacitic volcano with slopes that reach about 45 degrees, forms the highest peak in this part of the northern Andes. Acamarachi, also known as Cerro Pili, is at the SSE end of a small volcanic complex that extends from the neighboring volcano Colachi to the NNW. A large lava dome is located on the north flank of the 6046-m-high volcano. A poorly preserved summit crater and the absence of youthful flank lava flows suggest that Acamarachi was largely constructed in pre-Holocene times, although the summit lava flows draping the upper cone were considered to be of Holocene age (González-Ferrán, 1995).
The Global Volcanism Program is not aware of any Holocene eruptions from Acamarachi. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Acamarachi page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.
|Acamarachi, an impressively steep-sided andesitic-dacitic volcano with slopes that reach about 45 degrees, towers above Laguna Aguas Calientes. The 6046-m-high Acamarachi is the highest peak in this part of the northern Andes and lies at the SSE end of a small volcanic complex that extends from the neighboring volcano Colachi. A poorly preserved summit crater and the absence of youthful flank lava flows suggest that Acamarachi was largely constructed in pre-Holocene times, although the summit lava flows may be younger.
Photo by Oscar González-Ferrán (University of Chile).
|The western flank of Acamarachi volcano is seen in an aerial view with ignimbrite deposits of the Pliocene La Pacana caldera in the background. This steep-sided andesitic volcano, also known as Cerro Pili, rises to 6046 m.
Photo by Insitituto Geográfico Militar, courtesy of Oscar González-Ferrán (University of Chile).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
de Silva S L, Francis P W, 1991. Volcanoes of the Central Andes. Berlin: Springer-Verlag, 216 p.
Gardeweg M C, 1993. . (pers. comm.).
Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.
IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..