Water release patterns of heated speleothem calcite and hydrogen isotope composition of fluid inclusions |
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| Authors: | Sophie Verheyden Dominique Genty Olivier Cattani Martin R van Breukelen |
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| Institution: | 1. Laboratoire des Sciences du Climat et de l''environnement (LSCE) CEA/CNRS, Bât 709, Orme des Merisiers F-91191, Gif-sur-Yvette, France;2. Fonds National de la Recherche Scientifique, Belgique (FNRS), Belgium;3. Faculteit der Aard-en Levenswetenschappen, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands;1. Department of Soil Science, Faculty of Agriculture, University of Zagreb, Sveto?imunska 25, 10000 Zagreb, Croatia;2. Centro Nacional de Investigación sobre la Evolución Humana, Paseo Sierra de Atapuerca s/n, 09002 Burgos, Spain;3. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, B15 2TT Birmingham, United Kingdom;1. Analytical, Environmental and Geochemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussels, Belgium;2. Labaratoire des Sciences du Climat et de l’Environnement, 91400, Gif-sur-Yvette, France;3. Atomic and Mass Spectrometry Group, Department of Analytical Chemistry, Universiteit Gent, Krijgslaan 281 S12, 9000, Gent, Belgium;4. Géosciences Environnement Toulouse, OMP, Univ. Toulouse III Paul Sabatier, CNRS, IRD, 31400, Toulouse, France;5. Department of Geology, Union College, Schenectady, NY, 12308, USA;6. Université de Liège, 4000, Liège, Belgium;7. Centre d’études et de Recherches Appliquées au Karst (CERAK), Faculté Polytechnique de Mons, 7000, Mons, Belgium;8. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an, China;9. Department of Earth Sciences, University of Minnesota, Minneapolis, USA;1. Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia;2. Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia;3. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK;4. Department of Environment and Conservation, 14 Queen St, Busselton, WA, Australia;5. Connected Waters Initiative Research Centre, University of New South Wales, Sydney, NSW, Australia;6. National Centre for Groundwater Research and Training, Australia;1. Centro Nacional de Investigación sobre Evolución Humana (CENIEH), Paseo Sierra de Atapuerca 3, 09002 Burgos, Spain;2. Escuela Interuniversitaria de Posgrado en Evolución Humana, C/ Don Juan de Austria, nº 1, 09001 Burgos, Spain;3. Grupo Espeleológico Edelweiss, Excma. Diputación Provincial de Burgos, C/Paseo del Espolón s/n, 09071 Burgos, Spain;4. Sorbonne universités, UPMC Univ Paris 06, UMR 7619, METIS, F-75005 Paris, France;5. Análisis y Gestión del Subsuelo, S.L. c/ Luxemburgo, 4, portal 1, oficina 3, 28224, Pozuelo de Alarcón, Madrid, Spain;6. IPHES, Institut Català de Paleoecología Humana i Evolució Social. Unidad asociad al CSIC, C/Escorxador s/n, 43003 Tarragona, Spain;7. Universitat Rovira i Virgili (URV), Campus Catalunya, Avinguda de Catalunya 35, 43002 Tarragona, Spain;8. Equipo de Investigación Primeros Pobladores de Extremadura, Casa de Cultura Antonio Rodríguez Moñino, Avda. Cervantes s/n, 10003 Cáceres, Spain;1. Laboratoire des Sciences Du Climat et de L''Environnement, CEA-CNRS-UVSQ, CEA-Saclay, 91191, Gif-sur-Yvette, France |
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| Abstract: | Speleothem fluid inclusions are a potential paleo-precipitation proxy to reconstruct past rainwater isotopic composition (δ18O, δD). To get a better insight in the extraction of inclusion water from heated speleothem calcite, we monitored the water released from crushed and uncrushed speleothem calcite, heated to 900 °C at a rate of 300 °C/h, with a quadrupole mass spectrometer. Crushed calcite released water in three not well individualised peaks between 25 and 360 °C, 360 and 650 °C and between 650 and 800 °C while uncrushed calcite released water in two distinct temperature intervals: between 25 and 550 °C and between 550 and 900 °C.Water from two speleothems from the Han-sur-Lesse cave was recovered using three different techniques: i) the crushing and heating to 360 °C technique, ii) the decrepitation by heating to 550 °C and iii) the decomposition by heating to 900 °C technique. Measurements of the δD of water recovered by the decomposition of Han-sur-Lesse calcite heated to 900 °C did not show a 20 to 30‰ offset as found by previous authors. However a difference of 7‰ was observed between water released before and after decomposition of the calcite. Water recovery from the Han-sur-Lesse samples suggests that a simple heating technique (up to 550 °C) without crushing could both (a) recover water with δD representative of that of the drip water and (b) double the water yield as compared to the crushing and heating method.Our study warns for possible contamination of the recovered inclusion water with hydration water of lime, responsible for the recovery of water with very negative δD values. |
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