Argon-lead isotopic correlation in mid-atlantic ridge basalts
Argon-lead isotopic correlation in mid-atlantic ridge basalts
复制标题
大西洋中脊玄武岩中的氩-铅同位素相关性
作者：
Sarda;Moreira;Staudacher
对中大西洋岭玻璃样品的分步加热分析表明，最大40Ar/36Ar值与206,207,208Pb/204Pb相关。这些相关性适用于整个大西洋，因此不太可能是浅层污染过程造成的。相反，它们被认为是脱气枯竭的上地幔与以高206Pb/204Pb比值（19 ~ 21）和低40Ar/36Ar比值（300 ~ 1000）为特征的再循环组分之间的混合双曲线。这些关系暗示氩也可能是地幔再循环的示踪剂。
Step-heating analyses for Mid-Atlantic Ridge glass samples show that maximum 40Ar/36Ar values correlate with 206,207,208Pb/204Pb. These correlations hold for the whole Atlantic Ocean and therefore are unlikely to result from shallow-level contamination processes. Instead, they are taken as mixing hyperbolae between the degassed-depleted upper mantle and a recycled component characterized by high 206Pb/204Pb ratios (19 to 21) and low 40Ar/36Ar ratios (300 to 1000). These relations imply that argon may also be a tracer of mantle recycling.