Fission track analyses of ODP Hole 129-800A samples
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Descripción: Four models of fission track annealing in apatite are compared with measured fission track lengths in samples from Site 800 in the East Mariana Basin, Ocean Drilling Program Leg 129, given an independently determined temperature history. The temperature history of Site 800 was calculated using a one-dimensional, compactive, conductive heat flow model assuming two end-member thermal cases: one for cooling of Jurassic ocean crust that has experienced no subsequent heating, and one for cooling of Cretaceous ocean crust. Because the samples analyzed were only shallowly buried and because the tectonic history of the area since sample deposition is simple, resolution of the temperature history is high. The maximum temperature experienced by the sampled bed is between 16°-21°C and occurs at 96 Ma; temperatures since the Cretaceous have dropped in spite of continued pelagic sediment deposition because heat flow has continued to decay exponentially and bottom-water temperatures have dropped. Fission tracks observed within apatite grains from the sampled bed are 14.6 +/- 0.1 µm (1 sigma) long. Given the proposed temperature history of the samples, one unpublished and three published models of fission track annealing predict mean track lengths from 14.8 to 15.9 µm. These models require temperatures as much as 40°C higher than the calculated paleotemperature maximum of the sampled bed to produce the same degree of track annealing. Measured and predicted values are different because annealing models are based on extrapolation of high temperature laboratory data to geologic times. The model that makes the closest prediction is based on the greatest number of experiments performed at low temperature and on an apatite having composition closest to that of the core samples.
Autor(es): Vrolijk, Peter J - Donelick, Raymond A - Queng, John - Cloos, Mark -
Tipo: application/zip, 4 datasets -
Palabras clave: 129 - 800A - about best - fit ellipse (after Donelick, 1991) - Age, dated - Age, dated standard deviation - Age dated - Age std dev - Ap - Apatite - arithmetic mean of individual grain fissiomn track ages - arithmetic mean of track length - Calcium oxide - Calcium oxide, standard deviation - CaO - CaO std dev - Chlorine - Cl - d13C cal - d18O cal - delta 13C, calcite - delta 18O, calcite - Depth - Depth, bottom/max - DEPTH, sediment/rock - Depth, top/min - Depth bot - Depth top - DRILL - Drilling/drill rig - Electron microprobe - Elements, total - F - Fluorine - Fluorine, standard deviation - F std dev - Grains - Grains, counted/analyzed - induced, density of tracks (*10**5) in tracks/cm**2) - induced, number of tracks - in glass dosimeter, density of tracks (*10**5) in tracks/cm**2) - in glass dosimeter, number of tracks - Joides Resolution - l - Label 2 - Leg129 - Length - Length, standard deviation - l std dev - mean track length parallel to c - axis - N - Na2O - Na2O std dev - North Pacific Ocean - number of tracks - Ocean Drilling Program - ODP - ODP sample designation - P2O5 - P2O5 std dev - Phosphorus oxide - Phosphorus oxide, standard deviation - poolde age = fission track age based on sum total of spontaneouse and induced tracks for all grains - probability that statistical test value is greater than reported for a single population of grain ages (for values of Q>0.05, pooled age is more accurate) - S. subcrassus c C - Sample - Sample amount - Sample code/label - Sample code/label 2 - Sample ID - SO3 - SO3 std dev - Sodium oxide - Sodium oxide, standard deviation - spontaneous, density of tracks (*10**5) in tracks/cm**2) - spontaneous, number of tracks - SrO - SrO std dev - Standard deviation - Standard error - statistical test - Std dev - Std e - Strontium oxide - Strontium oxide, standard deviation - Subeucalanus subcrassus, copepodites, biomass as carbon - Sulphite - Sulphite, standard deviation - T cal - Temperature, calculated - total - track length - track length parallel to a - track length parallel to c -
Cobertura: LATITUDE: 21.923000 * LONGITUDE: 152.322900 * DATE/TIME START: 1989-11-26T02:45:00 * DATE/TIME END: 1989-12-05T20:27:00 -
Tipo de recurso:
Tipo de Interactividad: Expositivo
Nivel de Interactividad: muy bajo
: CC-BY: Creative Commons Attribution 3.0 Unported
Formatos: application/zip, 4 datasets -
Requerimientos técnicos: Browser: Any -
[IsBasedOn] Supplement to: Vrolijk, Peter J; Donelick, Raymond A; Queng, John; Cloos, Mark (1992): Testing models of fission track annealing in apatite in a simple thermal setting: Site 800, Leg 129. In: Larson, RL; Lancelot, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 129, 169-176, doi:10.2973/odp.proc.sr.129.147.1992
Fecha de contribución: 21-abr-2015
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