Ca isotopic analysis of laser-cut microsamples of (bio)apatite without chemical purification
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- 作者：Qiong Li ; qiong.li@rhul.ac.uk" class="auth_mail" title="E-mail the corresponding author ; Matthew Thirlwall ; Wolfgang Mü ; ller
- 关键词：Ca isotopes ; Enamel apatite ; TIMS ; (LA)-MC-ICPMS ; Double spike ; Laser- microsampling
- 刊名：Chemical Geology
- 出版年：2016
- 出版时间：1 March 2016
- 年：2016
- 卷：422
- 期：Complete
- 页码：1-12
- 全文大小：1838 K
文摘
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Laser-cutting allows well-constrained microsampling along isochronous growth lines and extraction of μg-sized fragments.
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No ion exchange chromatography is required for accurate TIMS Ca-isotope analysis of natural calcite and (bio)apatite.
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The 42Ca–48Ca double spike corrected TIMS δ44/40Ca values of Ca-isotope standards agree well with published data.
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No detectable laser-induced mass fractionation on Ca isotopes is observed on apatite during laser cutting.
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The δ44/40Ca profile of a modern human third molar suggests both dietary and physiological controls on enamel Ca-isotopes.