2007, English, Thesis edition: Geological and hydrogeochemical investigations into the holocene carbonate dominated wetlands, Roebuck Bay and Roebuck Plains, Western Australia / Edward A.T. Oldmeadow. Oldmeadow, Edward A. T.

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Bookmark: https://trove.nla.gov.au/version/46954713
Physical Description
  • 1 v. (various pagings) : ill. (chiefly col.) ; 31 cm. + 1 computer laser optical disc (4 3/​4 in.)
Published
  • 2007.
Language
  • English

Edition details

Title
  • Geological and hydrogeochemical investigations into the holocene carbonate dominated wetlands, Roebuck Bay and Roebuck Plains, Western Australia /​ Edward A.T. Oldmeadow.
Author
  • Oldmeadow, Edward A. T.
Other Authors
  • Curtin University of Technology. Dept. of Applied Geology.
Published
  • 2007.
Physical Description
  • 1 v. (various pagings) : ill. (chiefly col.) ; 31 cm. + 1 computer laser optical disc (4 3/​4 in.)
Subjects
Summary
  • Detailed geological and hydrogeochemical investigations of the carbonate dominated RAMSAR wetland of Roebuck Bay and adjacent Roebuck Plains, on the Kimberley coastline of Western Australia, has provided an understanding of the evolutionary and diagenetic trends of mineral and groundwater assemb lages in the Ho locene and modern sediments (note that the term modern is used throughout this thesis to represent sediments deposited in the last 250 years). Broad temporal and spatial understanding of the Holocene Roebuck Plains environment has resulted in a detailed appreciation of present day contaminant status within the modern Roebuck Bay environment, known to be the world's most biodiverse intertidal tropical wetland, and one of the few documented places in the world where marine sourced carbonate silts and clay are currently accumulating in an environment open to the ocean.
  • Literature review, field and laboratory experimentation and computational methods have been used to establish sea level, palaeo-climatic, sedimentological, mineralogical, geochemical and hydrogeochemical models aimed at identifying the evolution of the Roebuck Plains and Roebuck Bay system. Key outcomes of this research include.
  • » Establishment of a post Late Pleistocene sea level and palaeo-climatic model which shows that the geomorphological and near surface (typically <5m BOL) sedimentological and stratigraphic evolution of the study area was primarily controlled by wetland progradation under regressive sea levels after the Mid-Holocene Climatic Optimum (estimated at circa 6,000 years B.P).
  • » Characterisation of the Holocene to modern diagenetic evolution of carbonate minerals, which, form as biogenic aragonite, calcite and high Mg calcite (predominantly as the tests of marine organisms) in the shaflow tropical waters of the intertidal zone of Roebuck Bay, and undergo chemical weathering to produce the secondary carbonate minerals ankerite and dolomite as observed in the early Holocene sediments of Roebuck Plains.
  • » Characterisation of key hydrogeochemical processes that facilitate carbonate diagenesis in the sediments of Roebuck Bay and Roebuck Plains, including evaporative pumping, membrane filtration, meteoric water infiltration into originally saline sediment, the influence of local wetlands on mineral stability, water-rock interaction processes such as dissolution and precipitation of minerals and the associated release and/​or capture of trace elements, and cation exchange reactions.
  • » Establishment of a geochemical background (the pre-industrialised Roebuck Background or PIRB) for the trace elements As, Cu, Cd, Hg, Mo, Ni, Pb, Sn, V, Zn from the pristine Holocene sediments of Roebuck Plains which was used to assess contaminant status in the modern intertidal zone of Roebuck Bay. Use of the PIRE as well as other contaminant assessment criteria reveal that the sediments of Roebuck Bay are still predominantly unaffected by anthropogenic contamination, with the exception of areas heavily utilised in the past and present for industrial purposes, including Dampier Creek and the town jetty.
  • » Detailed investigations of contaminated and non-contaminated sediments in tidal creek areas (Dampier Creek and Crab Creek respectively) the results of which highlighted that the most common anthropogenic contaminants are Cu, Pb and Zn, which exceed the Australian and New Zealand Conservation Council (ANZECC) guidelines for the protection of ecosystem health at Dampier Creek. Contaminant investigations also highlighted that the chemical and physical behaviour of trace elements, in particular As, V and Cr in the contaminated and non-contaminated settings differed with respect to differing grain size, composition and cation exchange capacity characteristics of the sediments.
  • As well as providing, for the first time, key physical and chemical baseline information for the internationally significant area, research into the Quaternary sea level and palaeo-climatic history, hydrogeochemistry, mineralogy and contaminant status of Roebuck Bay and Roebuck Plains has highlighted how interconnected the different geomorphological areas are and how important each of these areas are for the functioning of the geo-biological system as a whole. This research also illustrates how a detailed geological appreciation of an area can facilitate greater environmental awareness of the area, and shows how, in some circumstances, the past can be the key to the present.
Notes
  • At head of title: Department of Applied Geology.
  • Thesis (Ph.D.)--Curtin University of Technology.
Language
  • English
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