Galapagos Spreading Center Basalt Glass Helium Isotope Data

Abstract: Along the Galápagos Spreading Center 3He/4He varies from 8.5 to 5.9 RA. High 3He/4He ratios, resembling those in the western and southern Galápagos islands, are absent. The most striking feature is a 3He/4He gradient, decreasing westward from 8.4 to 7.0 RA between 89° and 93°W, where the GSC is shallowest and shows “axial high” morphology.

Other Description: Graham, D. W., B. B. Hanan, J. E. Lupton, K. Hoernle, R. Werner, D. M. Christie and J. M. Sinton (2014) "Helium isotope variations and mantle plume – spreading ridge interactions along the Galápagos Spreading Center." Geophysical Monograph 204. The Galápagos: A Natural Laboratory for the Earth Sciences. Eds. K. S. Harpp, E. Mittelstaedt, N. d’Ozouville and D. W. Graham, pp. 391-412.

摘要：在加拉帕戈斯扩张中心（Galápagos Spreading Center），3He/4He同位素比值介于8.5至5.9 RA之间。未观测到与加拉帕戈斯西部及南部岛屿相近的高3He/4He比值。最显著的特征为3He/4He梯度：在西经89°至93°区间内，该比值自8.4 RA向西逐渐降低至7.0 RA，此区域为加拉帕戈斯扩张中心最浅处，且呈现“轴部高地”（axial high）地貌形态。

其他说明：Graham, D. W.、B. B. Hanan、J. E. Lupton、K. Hoernle、R. Werner、D. M. Christie与J. M. Sinton（2014）的论文《加拉帕戈斯扩张中心的氦同位素变化与地幔柱-扩张脊相互作用》，收录于《地球物理专论》（Geophysical Monograph）第204卷《加拉帕戈斯：地球科学的天然实验室》，由K. S. Harpp、E. Mittelstaedt、N. d’Ozouville及D. W. Graham主编，页码范围391-412。