The Mid-Atlantic Ridge Near 45 °N. XVI. Serpentinized Ultramafic Intrusions
The Mid-Atlantic Ridge Near 45 °N. XVI. Serpentinized Ultramafic Intrusions
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北纬 45° 附近的大西洋中脊 XVI。
DOI：
10.1139/e71-062
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发表时间：
1971
影响因子：
1.4
通讯作者：
H. Loubat
中科院分区：
文献类型：
--
作者：
F. Aumento;H. Loubat
对从北纬45°大西洋中脊挖掘出的蛇纹石化超镁铁岩的矿物学、岩相学、地球化学和物理性质的详细描述，支持了对这些岩石在最初结晶后受到影响的事件的解释。结晶作用显然发生在地壳/上地幔界面的山脊轴下的条件下，安静到足以允许重力晶体分化和分层的lopoliths侵位。然后，在高静水压力下，岩石破裂无水化，具有微弱的方向分量，可能是在有利于间隙矿物固态重结晶的条件下。水化作用（角闪岩化作用）开始于紧密机械变形的最后阶段和杆晶交代作用的开始。进一步的水化作用导致了多个重叠的蛇纹化时期，这取决于不同的物理条件。水化液可能来自幼年水...
Detailed descriptions of the mineralogy, petrography, geochemistry, and physical properties of serpentinized ultramafic rocks dredged from the Mid-Atlantic Ridge at 45° N support an interpretation of the events which affected these rocks after their original crystallization. Crystallization apparently took place in lopoliths emplaced at the Crust/Upper Mantle interface beneath the axis of the ridge under conditions quiet enough to permit gravity crystal differentiation and layering. The rocks were then fractured without hydration under high hydrostatic pressure, with a feeble directional component, possibly under conditions favoring solid-state recrystallization of interstitial minerals. Hydration (amphibolization) began during the last phases of intimate mechanical deformation and the commencement of rodingitic metasomatism. Further hydration resulted in multiple overlapping periods of serpentinization dependent on varying physical conditions. Hydrating fluids may have been derived both from juvenile wat...