Melt production rates in mantle plumes
Melt production rates in mantle plumes
复制标题
地幔柱的熔体生产率
DOI：
10.1098/rsta.1993.0010
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
R. White
中科院分区：
文献类型：
--
作者：
R. White
我根据地震学测量的地壳增厚和上覆山脊的体积计算了位于大洋岩石圈之下的地幔热柱的熔体产生率。观测到的熔体产生率在岩石圈较薄的地方较高，这与对流羽流中减压熔融过程的理论预测一致。地幔热柱的生产力，特别是夏威夷热柱的生产力，在几千万年的时间尺度上是不同的。这可以用羽流的温度和流量的变化来解释。留尼汪岛羽流的踪迹表明，在德干溢流玄武岩产生后的30 Ma内，熔体产量显著下降，这反映了与羽流形成相关的瞬时异常热条件导致的羽流温度的下降。
I calculate the melt production rates for mantle plumes lying beneath oceanic lithosphere from the crustal thickening measured by using seismics and from the volume of the overlying ridge. Observed melt production rates are higher where the lithosphere is thinner, in accord with theoretical predictions of the processes of decompression melting in convective plumes. The productivity of mantle plumes, and in particular that of the Hawaiian plume, is shown to vary on timescales of a few tens of millions of years. This can be explained by variations in the temperature and flow rate of the plumes. The trace of the Reunion plume shows a marked drop in melt production over the 30 Ma following generation of the Deccan flood basalts, which reflects a decrease in the plume temperature from the transient abnormally hot conditions associated with initiation of the plume.