Hanan BB, Graham DW
B. B. Hanan, Department of Geological Sciences, San Diego State University, San Diego, CA 92182-1020, USA. D. W. Graham, College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5503, USA.
Science. 1996 May 17;272(5264):991-5. doi: 10.1126/science.272.5264.991.
Linear arrays in lead isotope space for mid-ocean ridge basalts (MORBs) converge on a single end-member component that has intermediate lead, strontium, and neodymium isotope ratios compared with the total database for oceanic island basalts (OIBs) and MORBs. The MORB data are consistent with the presence of a common mantle source region for OIBs that is sampled by mantle plumes. 3He/4He ratios for MORBs show both positive and negative correlation with the 206Pb/204Pb ratios, depending on the MORB suite. These data suggest that the common mantle source is located in the transition zone region. This region contains recycled, oceanic crustal protoliths that incorporated some continental lead before their subduction during the past 300 to 2000 million years.
大洋中脊玄武岩（MORB）在铅同位素空间中的线性阵列汇聚于一个单一的端元组分，与大洋岛玄武岩（OIB）和MORB的总数据库相比，该组分具有中等的铅、锶和钕同位素比值。MORB数据与由地幔柱采样的OIB存在共同地幔源区一致。根据MORB组合的不同，MORB的3He/4He比值与206Pb/204Pb比值呈现出正相关和负相关。这些数据表明，共同地幔源位于过渡带区域。该区域包含在过去30亿至20亿年俯冲之前混入了一些大陆铅的再循环大洋地壳原岩。
