Aracar

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  • Argentina
  • South America
  • Stratovolcano
  • Unknown - Undated Evidence
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 24.29°S
  • 67.783°W

  • 6095 m
    19992 ft

  • 355160
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: April 1993 (BGVN 18:04)


Ash column reported

A steam plume was observed rising above Arácar on 28 March. Viewed from the town of Tolar Grande, 50 km SE, the plume persisted throughout the clear day. At least twice during the day, a large ash column slowly rose 2,000 m above the summit. The following day clouds prevented a clear view of the volcano, but an "ashy haze" in the sky was noted. A local observer indicated that the activity was not unusual.

Arácar has a base 10 km in diameter. It is located just E of the Argentina-Chile border, ~ 100 km S of Lascar and 80 km NE of Llullaillaco volcanoes. No historical eruptions have been recorded. Moyra Gardeweg provided the following background. "It is clearly younger than the surrounding Miocene volcanoes. Its steep conical edifice has been cut by some deep gorges and an uncovered alteration zone lies close to its summit on the NE flank. It has a well-developed and well-preserved summit crater (1-1.5 km diameter) that contains a tiny lake. Lava flows are well preserved at the base of the cone (below 4,500-m elev), a common feature of Pliocene-to-Quaternary volcanoes in the Central Andes. I have no information about its exact age, but the good preservation of the summit crater and lava flows suggest that it could be Quaternary, although I can only assume it is Pliocene or younger."

Information Contacts: R. Trujillo, Colorado, USA; M. Gardeweg, SERNAGEOMIN, Santiago.

The Global Volcanism Program has no Weekly Reports available for Aracar.

Index of Bulletin Reports


Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

04/1993 (BGVN 18:04) Ash column reported




Bulletin Reports

All information contained in these reports is preliminary and subject to change.


04/1993 (BGVN 18:04) Ash column reported

A steam plume was observed rising above Arácar on 28 March. Viewed from the town of Tolar Grande, 50 km SE, the plume persisted throughout the clear day. At least twice during the day, a large ash column slowly rose 2,000 m above the summit. The following day clouds prevented a clear view of the volcano, but an "ashy haze" in the sky was noted. A local observer indicated that the activity was not unusual.

Arácar has a base 10 km in diameter. It is located just E of the Argentina-Chile border, ~ 100 km S of Lascar and 80 km NE of Llullaillaco volcanoes. No historical eruptions have been recorded. Moyra Gardeweg provided the following background. "It is clearly younger than the surrounding Miocene volcanoes. Its steep conical edifice has been cut by some deep gorges and an uncovered alteration zone lies close to its summit on the NE flank. It has a well-developed and well-preserved summit crater (1-1.5 km diameter) that contains a tiny lake. Lava flows are well preserved at the base of the cone (below 4,500-m elev), a common feature of Pliocene-to-Quaternary volcanoes in the Central Andes. I have no information about its exact age, but the good preservation of the summit crater and lava flows suggest that it could be Quaternary, although I can only assume it is Pliocene or younger."

Information Contacts: R. Trujillo, Colorado, USA; M. Gardeweg, SERNAGEOMIN, Santiago.

Aracar is a steep-sided stratovolcano with a youthful-looking summit crater 1-1.5 km in diameter that contains a small lake. It is located just east of the Argentina-Chile border. The volcano was constructed during three eruptive cycles dating back to the Pliocene. The andesitic stratovolcano overlies dacitic lava domes. Lava flows found at the base of the volcano below 4500 m elevation are relatively well preserved, but upper-flank lavas, often an indication of youthful activity, are not present (de Silva, 2007 pers. comm.). There were reports of possible ash columns from the summit in 1993, but it is not known whether these were rockfall dust or eruption plumes.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1993 Mar 28 ] [ Unknown ] Uncertain 2  

The Global Volcanism Program has no synonyms or subfeatures listed for Aracar.

Steep-sided Aracar stratovolcano rises to 6028 m just east of the Argentina-Chile border. The light-colored Salar de Pular and Sala de Incahuasi appear at the upper left and right, respectively, in this NASA Space Shuttle image with north to the upper right. Well-preserved lava flows are visible on the lower flanks below 4500 m elevation, and several satellitic cones are found at the base of the volcano. Prior to a report of possible ash columns from the summit in 1993, the volcano was not known to be active.

NASA Space Shuttle image ISS006-E-13813, 2003 (http://eol.jsc.nasa.gov/).

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, 2007. . (pers. comm.).

Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.

Smithsonian Institution-GVN, 1990-. [Monthly event reports]. Bull Global Volc Network, v 15-33.

Volcano Types

Stratovolcano

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Dacite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
94
4,803

Affiliated Databases

Large Eruptions of Aracar Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.