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首页> 外文期刊>Journal of geodynamics >Geodynamic implications of flattened tabular equigranular textured peridotites from the Bakony-Balaton Highland Volcanic Field (Western Hungary)
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Geodynamic implications of flattened tabular equigranular textured peridotites from the Bakony-Balaton Highland Volcanic Field (Western Hungary)

机译：Bakony-Balaton高地火山场（匈牙利西部）的扁平板状等粒织构橄榄岩的地球动力学意义

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Peridotite xenoliths showing unusual tabular equigranular textures (addressed as flattened tabular equigranular) were found in Neogene alkali basalts from the Bakony-Balaton Highland Volcanic Field (Western Hungary), Carpathian-Pannonian Region. The olivines have a characteristic crystallographic preferred orientation (CPO) with [0 1 0]-axes perpendicular to the foliation and the [100]- and [001]-axes forming a continuous girdle in the foliation plane. Contrarily, the CPO pattern of orthopyroxene is much more scattered, although a single maximum can be observed in [001] axes subparallel to the plane of foliation. In case of olivine, the activation of (0 1 0)[1 00] and also probably (0 1 0) [00 1] is suggested. The deformation micro-mechanisms of orthopyroxenes are suggested to be a combination of intracrystalline glide on the (1 0 0) [0 0 1 ] system and some kind of other mechanism resulting in quite scattered patterns. We suggest that the unusual orientation patterns of olivines and orthopyroxenes are the result of the complex tectonic evolution of the region. The flattened tabular equigranular xenoliths represent a structural domain within the subcontinental lithospheric mantle beneath the volcanic field with particular seismic characteristics. The occurrence of flattened domains in the upper mantle may considerably influence the percolation and residence time of the mantle melts and fluids, which could promote or prevent melt/wall-rock interaction.
机译：在喀尔巴阡-潘农尼地区的巴科尼-巴拉顿高地火山岩田（匈牙利西部）的新近纪碱性玄武岩中发现了橄榄石异岩，它们显示出不规则的板状等粒纹理（称呼为扁平板状等粒度）。橄榄石具有典型的晶体学优选取向（CPO），其中[0 1 0]轴垂直于叶面，而[100]和[001]轴在叶面中形成连续的腰带。相反，尽管在[001]平行于叶面的轴上可以观察到单个最大值，但邻苯二甲醚的CPO图更加分散。对于橄榄石，建议激活（0 1 0）[1 00]，也可能激活（0 1 0）[00 1]。建议邻苯二茂基的变形微观机制是（1 0 0）[0 0 1]系统上的晶内滑移与某种其他机制的结合，这些机制导致图案非常分散。我们认为，橄榄石和邻苯二酚的异常定向模式是该地区复杂构造演化的结果。扁平的片状等粒异种岩体代表了具有特殊地震特征的火山岩下的亚大陆岩石圈地幔内部的结构域。上地幔平坦区域的出现可能会极大地影响地幔熔体和流体的渗透和停留时间，这可能会促进或阻止熔体/壁岩相互作用。

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