Journal article
Arsenic in hydrothermal apatite: Oxidation state, mechanism of uptake, and comparison between experiments and nature
W Liu, Y Mei, B Etschmann, J Brugger, M Pearce, CG Ryan, S Borg, J Wykes, P Kappen, D Paterson, U Boesenberg, J Garrevoet, G Moorhead, G Falkenberg
Geochimica Et Cosmochimica Acta | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2017
Abstract
Element substitution that occurs during fluid–rock interaction permits assessment of fluid composition and interaction conditions in ancient geological systems, and provides a way to fix contaminants from aqueous solutions. We conducted a series of hydrothermal mineral replacement experiments to determine whether a relationship can be established between arsenic (As) distribution in apatite and fluid chemistry. Calcite crystals were reacted with phosphate solutions spiked with As(V), As(III), and mixed As(III)/As(V) species at 250 °C and water-saturated pressure. Arsenic-bearing apatite rims formed in several hours, and within 48 h the calcite grains were fully replaced. X-ray Absorption Nea..
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Awarded by Science and Industry Endowment Fund
Funding Acknowledgements
Research funding was provided by the Australian Research Council (ARC) to W. L. (FT130100510) and J. B. (DP140102765), and CSIRO OCE fellowship to Y.M. This research is also supported by the Science and Industry Endowment Fund. The bulk XAS data and the micro-XANES images were collected at the XAS and the XFM beamlines of the Australian Synchrotron, and quick-XANES imaging was carried out at the P06 beamline of the light source PETRA III at DESY, a member of the Helmholtz Association (HGF). The DFT calculations in this work were supported by resources provided by the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia. We thank the BCC group (Stephane Cuchet, Mischa Crumbach, Ate van der Burgt) for providing the sample from Binntal. C.G.R acknowledges travel funding provided by the International Synchrotron Access Program ( ISAP) managed by the Australian Synchrotron. The authors are grateful for the helpful reviews from Professor E. Ripley, Dr S. Rowins and an anonymous GCA reviewer.