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    Radiocarbon Ages of Lacustrine Deposits in Volcanic Sequences of the Lomas Coloradas Area, Socorro Island, Mexico

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    Author
    Farmer, Jack D.
    Farmer, Maria C.
    Berger, Rainer
    Issue Date
    1993-01-01
    Keywords
    lacustrine environment
    volcanology
    depositional environment
    Cerro Evermann
    Colima Mexico
    lava flows
    Lomas Coloradas
    Revillagigedo Archipelago
    Socorro Island
    volcanic risk
    sedimentation
    Holocene
    volcanoes
    igneous rocks
    volcanic rocks
    middle Holocene
    volcanism
    Mexico
    Cenozoic
    Quaternary
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    absolute age
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    Citation
    Farmer, J. D., Farmer, M. C., & Berger, R. (1993). Radiocarbon ages of lacustrine deposits in volcanic sequences of the Lomas Coloradas area, Socorro Island, Mexico. Radiocarbon, 35(2), 253-262.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653375
    DOI
    10.1017/S0033822200064924
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Extensive eruptions of alkalic basalt from low-elevation fissures and vents on the southern flank of the dormant volcano, Cerro Evermann, accompanied the most recent phase of volcanic activity on Socorro Island, and created the Lomas Coloradas, a broad, gently sloping terrain comprising the southern part of the island. We obtained 14C ages of 4690 +/- 270 BP (5000-5700 cal BP) and 5040 +/- 460 BP (5300-6300 cal BP) from lacustrine deposits that occur within volcanic sequences of the lower Lomas Coloradas. Apparently, the sediments accumulated within a topographic depression between two scoria cones shortly after they formed. The lacustrine environment was destroyed when the cones were breached by headward erosion of adjacent stream drainages. This was followed by the eruption of a thin basaltic flow from fissures near the base of the northernmost cone. The flow moved downslope for a short distance and into the drainages that presently bound the study area on the east and west. The flow postdates development of the present drainage system and may be very recent. Our 14C data, along with historical accounts of volcanic activity over the last century, including submarine eruptions that occurred a few km west of Socorro in early 1993, underscore the high risk for explosive volcanism in this region and the need for a detailed volcanic hazards plan and seismic monitoring.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200064924
    Scopus Count
    Collections
    Radiocarbon, Volume 35, Number 2 (1993)

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