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Stump, Edmund; Gootee, Brian; Lauria, Mary-Lou (2007): U-Pb (zircon) geochronologic analyses for rocks of the Transantarctic Mountains (Table 4.3-1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.611703, Supplement to: Stump, Edmund; Gootee, Brian; Talarico, Franco M (2006): Tectonic model for development of the Byrd Glacier discontinuity and surrounding regions of the Transantarctic Mountains during Neoproterozoic-Early Paleozoic. In: Fütterer, D K, Damaske, D, Kleinschmidt, G, Miller, H & Tessensohn, F (eds.), Antarctica: contributions to global earth sciences, Springer, Berlin, Heidelberg, New York, 181-190, hdl:10013/epic.26882.d001

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Abstract:
The Byrd Glacier discontinuity us a major boundary crossing the Ross Orogen, with crystalline rocks to the north and primarily sedimentary rocks to the south. Most models for the tectonic development of the Ross Orogen in the central Transantarctic Mountains consits of two-dimensional transects across the belt, but do not adress the major longitudinal contrast at Byrd Glacier. This paper presents a tectonic model centering on the Byrd Glacier discontinuity. Rifting in the Neoproterozoic producede a crustal promontory in the craton margin to the north of Byrd Glacier. Oblique convergence of the terrane (Beardmore microcontinent) during the latest Neroproterozoic and Early Cambrian was accompanied by subduction along the craton margin of East Antarctica. New data presented herein in the support of this hypothesis are U-Pb dates of 545.7 ± 6.8 Ma and 531.0 ± 7.5 Ma on plutonic rocks from the Britannia Range, subduction stepped out, and Byrd Glacier. After docking of the terrane, subduction stepped out, and Byrd Group was deposited during the Atdabanian-Botomian across the inner margin of the terrane. Beginning in the upper Botomian, reactivation of the sutured boundaries of the terrane resulted in an outpouring of clastic sediment and folding and faulting of the Byrd Group.
Coverage:
Latitude: -85.000000 * Longitude: -179.000000
Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 33
Event(s):
Ramsey_Glacier * Latitude: -85.000000 * Longitude: -179.000000 * Location: Transantarctic Mountains * Method/Device: Outcrop sample (OUTCROP) * Comment: position uncertain
Comment:
All errors are reported at the 1-sigma level and incorporate only uncertainties from measurement of isotopic ratios. U concentration and U/Th have uncertainty of ~25 %. Decay constants: 235U=9.8485 x 10**-10, 238U=1.55125 x 10**-10, 238U/235U=137.88. Isotope ratios are corrected for Pb/U fractionation by comparison with standard zircon with an age of 564±4 Ma. Initial Pb composition interpreted from Stacey and Kramers (1975), with uncertainties of 1.0 for 206Pb/204Pb and 0.3 for 207Pb/204Pb.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 ORDINAL NUMBEROrd NoGeocode
2 Sample code/labelSample labelStump, Edmund
3 UraniumUmg/kgStump, EdmundLaser-ablation mass-spectrometry
4 Lead-206/Lead-204 ratio206Pb/204PbStump, EdmundLaser-ablation mass-spectrometry
5 Uranium/Thorium ratioU/ThStump, EdmundLaser-ablation mass-spectrometry
6 Lead-207/Uranium-235 ratio207Pb/235UStump, EdmundLaser-ablation mass-spectrometry
7 Lead-206/Uranium-238 ratio206Pb/238UStump, EdmundLaser-ablation mass-spectrometry
8 Error correctionE corStump, EdmundLaser-ablation mass-spectrometry
9 Lead-206/Lead-207 ratio206Pb/207PbStump, EdmundLaser-ablation mass-spectrometry
10 Error, relativeError r%Stump, EdmundLaser-ablation mass-spectrometry207Pb/235U
11 Error, relativeError r%Stump, EdmundLaser-ablation mass-spectrometry206PB/238U
12 Error, relativeError r%Stump, EdmundLaser-ablation mass-spectrometry206PB/207PB
13 Age, datedAge datedkaStump, Edmund206PB/238U
14 Age, datedAge datedkaStump, Edmund207Pb/235U
15 Age, datedAge datedkaStump, Edmund206PB/207PB
16 Age, errorAge e±Stump, Edmund206PB/238U
17 Age, errorAge e±Stump, Edmund207Pb/235U
18 Age, errorAge e±Stump, Edmund206PB/207PB
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
561 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Ord No		2 
Sample label		3 
U [mg/kg]		4 
206Pb/204Pb		5 
U/Th		6 
207Pb/235U		7 
206Pb/238U		8 
E cor		9 
206Pb/207Pb		10 
Error r [%]
(207Pb/235U)		11 
Error r [%]
(206PB/238U)		12 
Error r [%]
(206PB/207PB)		13 
Age dated [ka]
(206PB/238U)		14 
Age dated [ka]
(207Pb/235U)		15 
Age dated [ka]
(206PB/207PB)		16 
Age e [±]
(206PB/238U)		17 
Age e [±]
(207Pb/235U)		18 
Age e [±]
(206PB/207PB)
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