Prenzel, Jannis; Lisker, Frank; Balestrieri, Maria Laura; Läufer, Andreas; Spiegel, Cornelia (2016): (Table 1) Apatite fission track (AFT) data of the Eisenhower Range [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.868499, Supplement to: Prenzel, J et al. (2013): The Eisenhower Range, Transantarctic Mountains: Evaluation of qualitative interpretation concepts of thermochronological data. Chemical Geology, 352, 176-187, https://doi.org/10.1016/j.chemgeo.2013.06.005
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Abstract:
The Transantarctic Mountains (TAM) were one of the first regions where apatite fission track (AFT) thermochronology was applied routinely to study exhumation processes and long term landscape evolution. Pioneering publications from the region introduced or refined interpretation concepts of thermochronological data such as the break in slope in vertical age profiles as qualitative marker for the onset of accelerated rock cooling.
New AFT data were compiled from vertical profiles in the Eisenhower Range, northern TAM, and compared with published data. Samples originally examined by population technique were re-analysed via the external detector technique. AFT ages increase from 32±2 Ma at an elevation of 220 m to 175±14 Ma at 2380 m. Geological evidence and thermal history modeling of the AFT data require Jurassic to Late Eocene reheating of the samples and an onset of cooling at ~35 - 30 Ma. This requires the deposition of a ~3 to 3.5 km thick sedimentary sequence on the granitic basement subsequent to Jurassic Ferrar magmatism at ~180 Ma. The regression of paleotemperatures against sample altitudes infers a high Jurassic geothermal gradient of ~60°C/km related to rifting processes and Ferrar magmatism, and a moderate Cretaceous/Eocene geothermal gradient of ~30°C/km. Comparison of ages generated with population and external detector technique shows the importance of determining single-grain ages for each sample, even from granitic rocks of the same intrusion, and thus strongly supports previous cases made for the determination of annealing kinetics and grain-age evaluation. Age comparison additionally illustrates, that samples above a break in slope record larger deviations between population and external detector ages than samples below a break in slope.
We demonstrate that position and shape of a break in slope result from various factors, such as the thermal history prior to final cooling, maximum paleotemperatures, cooling rate, and geothermal gradient. A break in slope does not straightly date the onset of final cooling and cannot substitute thermal history modeling. Therefore, earlier studies from the TAM and similar settings elsewhere need to be validated by combining thermal history modeling of thermochronological data and supplementary geological information.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -74.629500 * Median Longitude: 162.497000 * South-bound Latitude: -74.920000 * West-bound Longitude: 161.850000 * North-bound Latitude: -74.290000 * East-bound Longitude: 162.740000
Minimum Elevation: 220.0 m * Maximum Elevation: 2380.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Prenzel, Jannis | |||
| 2 | Latitude of event | Latitude | Prenzel, Jannis | |||
| 3 | Longitude of event | Longitude | Prenzel, Jannis | |||
| 4 | Elevation of event | Elevation | m | Prenzel, Jannis | ||
| 5 | Area/locality | Area | Prenzel, Jannis | |||
| 6 | Number | No | Prenzel, Jannis | xi | ||
| 7 | Standard deviation | Std dev | ± | Prenzel, Jannis | xi | |
| 8 | Fission-tracks, density, counted in stan | p d | 106 #/cm2 | Prenzel, Jannis | ||
| 9 | Fission-tracks | N d | 106 #/cm2 | Prenzel, Jannis | ||
| 10 | Fission-tracks, spontaneous, density | p s | 106 #/cm2 | Prenzel, Jannis | ||
| 11 | Fission-tracks, spontaneous | N s | 106 #/cm2 | Prenzel, Jannis | ||
| 12 | Fission-tracks, induced, density | p i | 106 #/cm2 | Prenzel, Jannis | ||
| 13 | Fission-tracks, induced | N i | 106 #/cm2 | Prenzel, Jannis | ||
| 14 | Percentage | Perc | % | Prenzel, Jannis | Chi² | |
| 15 | Grains, counted/analyzed | Grains | # | Prenzel, Jannis | ||
| 16 | Age, dated | Age dated | ka | Prenzel, Jannis | AFT age | |
| 17 | Age, dated standard deviation | Age dated std dev | ± | Prenzel, Jannis | AFT age | |
| 18 | Age, dated | Age dated | ka | Prenzel, Jannis | AFT age predicted | |
| 19 | Fission-track length, mean | MTL | µm | Prenzel, Jannis | ||
| 20 | Fission-track length, mean, standard deviation | MTL std dev | ± | Prenzel, Jannis | ||
| 21 | Number of observations | NOBS | # | Prenzel, Jannis | for MTL | |
| 22 | Fission-track length, mean | MTL | µm | Prenzel, Jannis | c-axis | |
| 23 | Fission-track length, mean | MTL | µm | Prenzel, Jannis | predicted MTL | |
| 24 | Fission-track length, mean, standard deviation | MTL std dev | ± | Prenzel, Jannis | SD | |
| 25 | Fission-track length, mean, standard deviation | MTL std dev | ± | Prenzel, Jannis | c-axis | |
| 26 | Fission-track length, mean, standard deviation | MTL std dev | ± | Prenzel, Jannis | predicted | |
| 27 | Goodness of fit | r**2 | Prenzel, Jannis | age | ||
| 28 | Goodness of fit | r**2 | Prenzel, Jannis | MTL | ||
| 29 | Diameter | Ø | µm | Prenzel, Jannis | mean fission-track etch pit diameter Dpar mean | |
| 30 | Age, dated | Age dated | ka | Prenzel, Jannis | original | |
| 31 | Age, dated standard deviation | Age dated std dev | ± | Prenzel, Jannis | original |
License:
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC-BY-NC-SA-3.0)
Size:
493 data points