Adams, Christopher J (2007): K-Ar age determination of Paleozoic rock samples from northern Victoria Land, Antarctica [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.605207, Supplement to: Adams, CJ (2006): Style of uplift of Paleozoic terranes in northern Victoria Land, Antarctica: Evidence from K-Ar age patterns. In: Fütterer, D K, Damaske, D, Kleinschmidt, G, Miller, H & Tessensohn, F (eds.), Antarctica: contributions to global earth sciences, Springer, Berlin, Heidelberg, New York, 205-214, hdl:10013/epic.26834.d001
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Abstract:
K-Ar ages of 82 slate and schist (white-mica-rich whole rock) samples are reported for Late Precambrian-Early Ordovician metamorphic rocks of the Wilson, Bowers and Robertson Bay terranes of northern Victoria Land. These are amalgamated in two vertical sections along composite NE-SW horizontal profiles across (1) Oates Coast in the north, and (2) Terra Nova Bay area in the south. The ages are in the range 328-517 Ma. Both profiles show some age variation with altitude, but more importantly, they define an inverted wedge shaped pattern, reflecting a „pop-up“ strucure. This is oriented NW-SE at the eastern margin of the Wilson terrane, and the edges coincide with the Exiles and Wilson Thrusts which cross the region. Ages inside the "pop-up" structure are younger, ca. 460-480 Ma, than those along its eastern and western flanks, ca. 490-520 Ma. The K-Ar age patterns thus demonstrate a late Ross Orogenic age (ca. 460 Ma) for this structure, which may be associated with assembly of the Wilson and Bowers terranes.
Related to:
Adams, Christopher J (1997): Initial strontium isotopic signatures of Late Precambrian-Early Paleozoic metasediments from northern Victoria Land, East Antarctica. In: Ricci, C.A. (ed.), The Antarctic Region: Geological Evolution and Processes, Proceedings of the VIIth. International Symposium on Antarctic Earth Sciences, Siena, Italy, Terra Antartica Publication, 227-231
Coverage:
Median Latitude: -70.410557 * Median Longitude: 158.941033 * South-bound Latitude: -74.700000 * West-bound Longitude: 155.700000 * North-bound Latitude: -69.133333 * East-bound Longitude: 168.533300
Event(s):
GXV86A * Latitude: -69.200000 * Longitude: 156.083333 * Location: Victoria Land, Antarctica * Method/Device: Outcrop sample (OUTCROP)
GXV110 * Latitude: -69.450000 * Longitude: 156.416667 * Location: Victoria Land, Antarctica * Method/Device: Outcrop sample (OUTCROP)
GXV113 * Latitude: -69.366667 * Longitude: 156.150000 * Location: Victoria Land, Antarctica * Method/Device: Outcrop sample (OUTCROP)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Adams, CJ (2007): K-Ar ages from Berg Mountains and Archangel Mountains, northern Victoria Land, Antarctica (Table 4.6-1). https://doi.org/10.1594/PANGAEA.605205
- Adams, CJ (2007): K-Ar ages from Oates Coast sector (Pacific margin) and Terra Nova Bay sector (Ross Sea), Antarctica (Table 4.6-1). https://doi.org/10.1594/PANGAEA.626429