Regional trends and petrologic factors inhibit global interpretations of zircon trace element compositions  

作　　者：Nick M.W.Roberts Christopher J.Spencer Stephen Puetz C.Brenhin Keller Simon Tapster 

机构地区：[1]Geochronology and Tracers Facility,British Geological Survey,Nottingham NG125GG,UK [2]Department of Geological Sciences and Geological Engineering,Queen’s University,Kingston,Ontario,Canada [3]475 Atkinson Dr,Suite 704,Honolulu,HI 96814,USA [4]Department of Earth Sciences,Dartmouth College,Hanover,New Hamphire,USA

出　　处：《Geoscience Frontiers》2024年第5期300-307,共8页地学前缘（英文版）

基　　金：supported by funding from the UK Natural Environment Research Council(NE/Y00549/1);supported by NERC Highlight Topic award"FAMOS"(From arc magmas to ores)NE/P01724X/1(British Geological Survey).

摘　　要：The trace element composition of zircon reveals information about the melt that they are derived from,as such,detrital zircon trace element compositions can be used to interrogate melt compositions,and thus the evolution of the continental crust in time and space.Here,we present a global database of detrital zircon compositions and use it to test whether average global trends for five common petrogenetic proxies truly represent secular changes in continental evolution.We demonstrate that the secular trend is broadly comparable across continental regions for Ti-in-zircon temperatures,but for other trace element ratios interrogated,secular trends are highly variable between continental regions.Because trace element ratios result from multiple petrologic variables,we argue that these petrogenetic proxies can be overinterpreted if projected to global geologic processes.In particular,we caution against the interpretation of crustal thickness from trace elements in zircon,and we argue that our results negate current hypotheses concerning secular changes in crustal thickness.

关 键 词：Detrital zircon Trace elements Secular change Eu anomaly Crustal thickness 

分 类 号：P587[天文地球—岩石学] P595[天文地球—地质学]