Guano-derived deposits within the sandy cave fills of Naracoorte, South Australia

Citation

Material Information

Title:
Guano-derived deposits within the sandy cave fills of Naracoorte, South Australia
Series Title:
Alcheringa
Creator:
Forbes, Matthew S.
Bestland, Erick A.
Publisher:
Taylor & Francis
Publication Date:
Physical Description:
1 online resource

Subjects

Subjects / Keywords:
Guano ( lcsh )
Sedimentation and deposition ( lcsh )
Genre:
serial ( sobekcm )
Location:
Oceania -- Australia -- South Australia

Notes

Abstract:
Geochemical and mineralogical data suggest that bat guano has made a major contribution to the development of several separate sedimentary layers, in the predominantly clastic sand and coarse silt deposits of the Naracoorte Caves, South Australia. A 20 cm thick group of reddish fine silt sediments located in Robertson Cave contains the phosphate minerals whitlockite and apatite, significant concentrations of SO3, P2O5, and CaO, and organic matter with low C/N ratios and highly enriched δN values. These data suggest that accumulations of bat guano and weathered cave limestone contributed significantly to the red silts formation. Sedimentary deposits located in Wet and Blanche Caves also contain horizons that exhibit increased concentrations of SO3, P2O5 and CaO, relatively lower C/N ratios and enriched δN values, suggesting that bat guano may have also contributed to their formation. Physical attributes evident for both these horizons further support this interpretation. A milky-white material that appears to be whitlockite is present in the Wet Cave horizon, while similarities are identified by thin section petrography, between the Blanche Cave horizon and the guano layer in Robertson Cave. The development of such horizons relies on minimal sediment input from outside the cave system; hence their presence may serve as an indicator of periods of landscape stability in the palaeoenvironmental record.
Original Version:
Volume 30, Supplement 1

Record Information

Source Institution:
University of South Florida
Holding Location:
University of South Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
K26-05379 ( USFLDC DOI )
k26.5379 ( USFLDC Handle )

USFLDC Membership

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