High resolution distribution of magnesium and strontium and the evaluation of Mg/Ca thermometry in Recent brachiopod shells |
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| Authors: | Alberto Pérez-Huerta Maggie Cusack Teresa E Jeffries C Terry Williams |
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| Institution: | 1. Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, United States;2. Department of Geology and Geography, West Virginia University, 330 Brooks Hall, 98 Beechurst Av., Morgantown, WV 26506, United States;3. Department of Oceanography, Texas A&M University, College Station, TX, 77843, United States;1. Camborne School of Mines and Environment and Sustainability Institute, University of Exeter, Penryn TR10 9FE, United Kingdom;2. Department of Geoscience and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen, Denmark;3. Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warsaw, Poland;4. Department of Earth Sciences, Memorial University, St. John''s, Newfoundland and Labrador, Canada;5. Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1, Canada;1. Department of Geological Sciences, The University of Alabama, Tuscaloosa, AL 35487, USA;2. PO Box 19576, Woolston, Christchurch 8241, New Zealand;3. Department of Earth and Planetary Sciences, The University of Tokyo, Tokyo 113-003, Japan;4. Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK |
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| Abstract: | High resolution distribution of magnesium and strontium determined by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) are presented in this study for Recent brachiopod shells. The concentration of magnesium and strontium decreases in a similar fashion from the outer to inner regions of shells of rhynchonelliform species but remains unaltered in craniid brachiopods. In rhynchonelliform brachiopods with low-magnesium shells, there is a characteristic chemical profile with an abrupt decrease in magnesium concentration from the primary layer towards the secondary layer until it reaches a region in which the values are almost constant. In addition, there is a proportional relationship in magnesium concentration between primary and secondary layers. Both findings demonstrate the biological control in magnesium incorporation in rhynchonelliform brachiopods confirming previously reported findings. Calculated Mg/Ca ratios based on magnesium concentrations within the innermost region of the secondary layer show that rhynchonelliform brachiopods can record seawater temperature. This finding opens up the possibility of using Mg/Ca (palaeo) thermometry even within the context of biological control and the potential application of Mg/Ca ratios as a seawater temperature proxy in fossil brachiopods. |
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