Human impact recorded in intertidal sediments, Moreton Bay, Australia

Morelli, Guia and Gasparon, Massimo (2009). Human impact recorded in intertidal sediments, Moreton Bay, Australia. In: Goldschmidt 2009 - "Challenges to our volatile planet". 19th Annual V.M. Goldschmidt Conference, Davos, Switzerland, (A903-A903). 21 - 26 June 2009.

Author Morelli, Guia
Gasparon, Massimo
Title of paper Human impact recorded in intertidal sediments, Moreton Bay, Australia
Conference name 19th Annual V.M. Goldschmidt Conference
Conference location Davos, Switzerland
Conference dates 21 - 26 June 2009
Proceedings title Goldschmidt 2009 - "Challenges to our volatile planet"   Check publisher's open access policy
Journal name Geochimica et Cosmochimica Acta   Check publisher's open access policy
Place of Publication Oxford, United Kingdom
Publisher Pergamon
Publication Year 2009
Sub-type Published abstract
ISSN 0016-7037
Volume 73
Issue 13
Start page A903
End page A903
Total pages 1
Language eng
Formatted Abstract/Summary
Sediment cores from estuarine and coastal intertidal areas in
Moreton Bay, Australia, are used to assess the temporal
evolution of inorganic contaminants levels during the past
200 years. The long – term depositional history of sediments
and their relationship with the human impact are defined
combining the historical fluxes of trace metals and sediments
variability (grain size, organic content and mineralogy) with
210Pb dating and other radionuclides signals along the
sediment cores.
Heavy metal concentrations in cores from different impacted
areas show various level of pollution. A 210Pb dated sediment
core shows higher levels of Cu, Co, Pb, Ni, Zn concentration
in the first 60 cm corresponding to the last 100 years (with
unsupported 210Pb values variable form 11.72 to 1.24
Bq/Kg). 137Cs activities from the same core supports the 210Pb
chronology, with detectable activities in the first 33 cm,
indicating a depositional age for sediments below prior of the
nuclear test of the 1960. To further constrain sediments
depositional history, variations of Pb isotopic values and
metal fluxes will be linked with known flood events. The
combined use of those different proxies provide a complete
historic record of anthropogenic impact in the sediments and
allows the definition of a natural “geochemical background”
for the selected sites to assess all the post-depositional
processes that may disturb the original geochemical signal.
This results in a powerful approach to correctly distinguish
human pollution in similar geological archives from
background values. Specifically, this study will develop a
clearer picture of what further environmental changes are to
be expected in the future for Moreton Bay.
Subjects 970104 Expanding Knowledge in the Earth Sciences
0403 Geology
Q-Index Code CX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Special issue: Awards Ceremony Speeches and Abstracts of the 19th Annual V.M. Goldschmidt Conference, V.M. Goldschmidt Conference

Document type: Conference Paper
Collection: School of Earth Sciences Publications
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Created: Wed, 05 May 2010, 14:04:48 EST by Tracy Paroz on behalf of School of Earth Sciences