Ultrarapid exhumation of ultrahigh-pressure diamond-bearing metasedimentary rocks of the Kokchetav Massif, Kazakhstan?
Ultrarapid exhumation of ultrahigh-pressure diamond-bearing metasedimentary rocks of the Kokchetav Massif, Kazakhstan?
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DOI：
10.1016/s0024-4937(03)00092-6
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发表时间：
2003-10
期刊：
影响因子：
3.5
通讯作者：
B. Hacker;A. Calvert;R. Zhang;W. Ernst;J. Liou
中科院分区：
文献类型：
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作者：
B. Hacker;A. Calvert;R. Zhang;W. Ernst;J. Liou
含金刚石的超高压Kokchetav地块在地幔深处180公里处535±3 Ma的榴辉岩相条件下重结晶，但新的40ar /39Ar年龄表明，它可能已经被挖掘到地壳深处（云母对Ar损失的封闭）~ 529 Ma。这些数据表明，可能的挖掘速度为每百万年几十公里，也就是说，这一速度与水平板块运动和俯冲的速度相当。
The diamond-bearing, ultrahigh-pressure Kokchetav Massif recrystallized at eclogite-facies conditions deep in the mantle at 180-km depth at 535±3 Ma, and yet new40Ar/39Ar ages suggest that it may have been exhumed to crustal depths (as indicated by closure of mica to Ar loss) by ∼529 Ma. These data indicate a possible exhumation rate of tens of kilometers per million years, i.e., a rate that is comparable to rates of horizontal plate motion and subduction.