Zooming in REE and Other Trace Elements on Conodonts:Does Taxonomy Guide Diagenesis?

作     者：Luca Medici Martina Savioli Annalisa Ferretti Daniele Malferrari Luca Medici;Martina Savioli;Annalisa Ferretti;Daniele Malferrari

作者机构：National Research Council of ItalyInstitute of Methodologies for Environmental AnalysisC.da S.Loja-Zona Industriale85050 Tito ScaloPotenzaItaly Department of Chemical and Geological SciencesUniversity of Modena and Reggio EmiliaVia Campi 10341125 ModenaItaly 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2021年第32卷第3期

页      面：501-511页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：Ph.D. Program "Models and Methods for Material and Environmental Sciences" of the University of Modena and Reggio Emilia IGCP Project 

主　　题：bioapatite crystallinity index HFSE laser ablation mass spectrometry microdiffraction Normandy Ordovician 

摘      要：Conodont elements are calcium phosphate(apatite structure)mineralized remains of the cephalic feeding apparatus of an extinct marine *** to the high affinity of apatite for rare earth elements(REE)and other high field strength elements(HFSE),conodont elements were frequently assumed to be a reliable archive of sea-water composition and changes that had occurred during ***,the crystallinity index of bioapatite,i.e.,the rate of crystallinity of biologically mediated apatite,should be generally linearly dependent on diagenetic alteration as the greater(and longer)the pressure and temperature to which a crystal is exposed,the greater the resulting *** this study,we detected the uptake of HFSE in conodont elements recovered from a single stratigraphic horizon in the Upper Ordovician of Normandy(France).Assuming therefore that all the specimens have undergone an identical diagenetic history,we have assessed whether conodont taxonomy(and morphology)impacts HFSE uptake and crystallinity *** found that all conodont elements are characterized by a clear diagenetic signature,with minor but significant differences among *** distinctions are evidenced also by the crystallinity index values which show positive correlations with some elements and,accordingly,with diagenesis;however,correlations with the crystallinity index strongly depend on the method adopted for its calculation.