Zou Haibo, Zindler Alan, Niu Yaoling
Department of Earth and Space Sciences, University of California at Los Angeles, Los Angeles, CA 90095, USA.
Science. 2002 Jan 4;295(5552):107-10. doi: 10.1126/science.1064295.
We report 230Th-238U disequilibrium data on mid-ocean ridge basalts recovered 5 to 40 kilometers off the ridge axis near 9 degrees 30'N of the East Pacific Rise. These data indicate near-symmetrical eruptions of normal mid-ocean ridge basalts (NMORBs) and incompatible element-enriched mid-ocean ridge basalts (EMORBs) as far as 20 kilometers off axis. Our results suggest large-scale subsurface lateral transport of NMORB melt at 19 to 21 centimeters per year and also provide constraints on the petrogenesis of EMORBs of off-axis origin.
我们报告了在东太平洋海隆北纬9度30分附近、距离洋中脊轴5至40公里处采集的大洋中脊玄武岩的钍-230 - 铀-238不平衡数据。这些数据表明，正常大洋中脊玄武岩（NMORB）和不相容元素富集的大洋中脊玄武岩（EMORB）在距离轴20公里处呈近对称喷发。我们的结果表明，NMORB熔体以每年19至21厘米的速度进行大规模的地下横向运移，同时也对轴外起源的EMORB的岩石成因提供了限制。
