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Establishing rates of karst landscape evolution in the Tropics: A context for the formation of archaeological sites in western Flores, Indonesia

Journal Article


Abstract


  • Tropical landscapes evolve at a rapid rate, creating stepped alluvial terraces, dense basin and cone topographies and multilevel cave systems. An understanding of the rate of landscape evolution is crucial for understanding how landscapes respond to tectonic instability and for reconstructing landscapes that have changed over archaeological timescales. The rate of landscape incision as a proxy for karst landscape evolution in Indonesia, a key region in the path of human dispersal, has been established using the rate of karstification by estimating a chronology for stages of cave development using thermal ionisation mass spectrometry U-series dating on flowstones, and the rate of downcutting by establishing a chronology for a series of alluvial terraces using red thermoluminescence dating. Using these techniques we have determined that the estimated rate of karstification (113 +/- 26 mm ka(-1)) is slower than the average rate of downcutting (305 +/- 24 mm k(-1)), and the combined rate of landscape incision (217 +/- 18 mm ka(-1)) is slower than the known rate of tectonic uplift for this region derived from raised coral terraces (450 +/- 50 mm ka(-1)). This suggests that rivers are quicker to respond to tectonic instability, but both cave and river systems display a slower rate of incision and karstification than uplift. Correlations between these components of the landscape system reveal a strong, interacting relationship where defined phases of uplift are reflected in the pattern of karstification and cycles of downcutting. An understanding of this relationship has been pivotal in reconstructing the formation and geomorphic history of archaeological caves such as Liang Bua. Copyright (C) 2010 John Wiley & Sons, Ltd.

Authors


  •   Westaway, Kira E. (external author)
  •   Sutikna, Thomas
  •   Morwood, Michael J. (external author)
  •   Zhao, J -X. (external author)

Publication Date


  • 2010

Citation


  • Westaway, K. E., Sutikna, T., Morwood, M. J. & Zhao, J. (2010). Establishing rates of karst landscape evolution in the Tropics: A context for the formation of archaeological sites in western Flores, Indonesia. Journal of Quaternary Science, 25 (6), 1018-1037.

Scopus Eid


  • 2-s2.0-78149368459

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5144

Has Global Citation Frequency


Number Of Pages


  • 19

Start Page


  • 1018

End Page


  • 1037

Volume


  • 25

Issue


  • 6

Abstract


  • Tropical landscapes evolve at a rapid rate, creating stepped alluvial terraces, dense basin and cone topographies and multilevel cave systems. An understanding of the rate of landscape evolution is crucial for understanding how landscapes respond to tectonic instability and for reconstructing landscapes that have changed over archaeological timescales. The rate of landscape incision as a proxy for karst landscape evolution in Indonesia, a key region in the path of human dispersal, has been established using the rate of karstification by estimating a chronology for stages of cave development using thermal ionisation mass spectrometry U-series dating on flowstones, and the rate of downcutting by establishing a chronology for a series of alluvial terraces using red thermoluminescence dating. Using these techniques we have determined that the estimated rate of karstification (113 +/- 26 mm ka(-1)) is slower than the average rate of downcutting (305 +/- 24 mm k(-1)), and the combined rate of landscape incision (217 +/- 18 mm ka(-1)) is slower than the known rate of tectonic uplift for this region derived from raised coral terraces (450 +/- 50 mm ka(-1)). This suggests that rivers are quicker to respond to tectonic instability, but both cave and river systems display a slower rate of incision and karstification than uplift. Correlations between these components of the landscape system reveal a strong, interacting relationship where defined phases of uplift are reflected in the pattern of karstification and cycles of downcutting. An understanding of this relationship has been pivotal in reconstructing the formation and geomorphic history of archaeological caves such as Liang Bua. Copyright (C) 2010 John Wiley & Sons, Ltd.

Authors


  •   Westaway, Kira E. (external author)
  •   Sutikna, Thomas
  •   Morwood, Michael J. (external author)
  •   Zhao, J -X. (external author)

Publication Date


  • 2010

Citation


  • Westaway, K. E., Sutikna, T., Morwood, M. J. & Zhao, J. (2010). Establishing rates of karst landscape evolution in the Tropics: A context for the formation of archaeological sites in western Flores, Indonesia. Journal of Quaternary Science, 25 (6), 1018-1037.

Scopus Eid


  • 2-s2.0-78149368459

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5144

Has Global Citation Frequency


Number Of Pages


  • 19

Start Page


  • 1018

End Page


  • 1037

Volume


  • 25

Issue


  • 6