AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > DT88-1A

SAMPLE INFO : DT88-1A
Sample ID:DT88-1A
Station ID:DT88-1
Latitude:53.26
Longitude:-168.49
Datum:NAD83
Date Sampled:1988-00-00
Sample Type 1:Other
Sample Type 2:Plutonic
Text Description:
from plutonic rock unit Tdb, collected at the east side of Geyser Bight yielded concordant biotite and hornblende ages (K-Ar) of 9.64 +/- 0.29 and 9.40 +/- 0.28 Ma, respectively. These concordant ages indicate that the dated pluton had a simple cooling history; it cooled through the argon-blocking temperatures for hornblende and biotite (from 530C +/- 40C to 280C +/-40C) at about 9.5 Ma. Cooling must have occurred in less than 300 ka (standard deviation of ages) for the ages to be concordant.

References:
Geology and geochemistry of the Geyser Bight Geothermal area, Umnak Island, Aleutian Islands, Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-majorsREF majorsMETH majorsFe2O3/Fe203T origFeO/FeOT origVolatiles csvMETH volatilesCsRbBaSrLaCePrNdSmEuGdTbDyHoErTmYbLuYZrNbHfTaPbThUScVCrFeCoNiCuZnGaMoAsNaKRef trace1METH trace1RbBaSrLaCeNdSmEuGdDyErYbLuYZrNbPbThUScTiVCrNiCuZnGaRef trace2METH trace2Light csvHalogen csvother major csvother lile csvother ree csvother hfse csvother hpe csvother tm csvother misc csv
DT88-153.26-168.49Turner, D. L.1988-00-00 9500000 K-Ar; 1064; see sample descriptionRecheshnoifrom plutonic rock unit Tdb, collected at the east side of Geyser Bight yielded concordant biotite and hornblende ages (K-Ar) of 9.64 +/- 0.29 and 9.40 +/- 0.28 Ma, respectively. These concordant ages indicate that the dated pluton had a simple cooling history; it cooled through the argon-blocking temperatures for hornblende and biotite (from 530C +/- 40C to 280C +/-40C) at about 9.5 Ma. Cooling must have occurred in less than 300 ka (standard deviation of ages) for the ages to be concordant.DT88-1AOtherQuenched InclusionWhole-rock 57.44 0.86 17.59 6.54 0.14 4.42 7.85 3.57 1.4 0.18 99.931064XRF6.54LOI=0.85XRF

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/samples/sample_info.php
Page modified: August 1, 2017 15:29
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.