首页|Proterozoic to Phanerozoic case studies of laser ablation microanalysis for microbial carbonate U-Pb geochronology
Proterozoic to Phanerozoic case studies of laser ablation microanalysis for microbial carbonate U-Pb geochronology
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Some of the earliest bio-sedimentary records of life on Earth are represented by microbial carbonates,which are also critical geochemical archives of ancient seawater chemistry and the environmental cir-cumstances in which they precipitated.Reconstructing paleo-microbial environments on Earth and potentially other planets requires precise determination of the depositional ages of these materials.The(abiogenic)carbonate geochemistry communities can now use developments in in-situ laser ablation U-Pb dating using inductively coupled plasma mass spectrometry(LA-ICP-MS).Due to the effects of impurity mixing and diagenesis,microbial carbonates have received little geochronological study despite their broad relevance for understanding ancient seawater's environmental conditions and geochemical compositions.This study demonstrates using time-of-flight mass spectrometry(TOF-MS)to perform quick,quantitative elemental mapping before U-Pb spot dating to improve experiment success rates and data reliability and offers four practical application examples.
StromatoliteMicrobial carbonateCarbonate geochronologyIn-situ LA-ICP-MSICP-Time Of Flight-MSTrace element mapping
Yuxiang Jiang、Simon V.Hohl、Xiangtong Huang、Shouye Yang
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State Key Laboratory of Marine Geology,School of Ocean and Earth Sciences,Tongji University,Shanghai 200092,China
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