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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Breccia formation during intrusion of a dolerite sill: an example from Sheffield Beach, KwaZulu-Natal North Coast, South Africa
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Breccia formation during intrusion of a dolerite sill: an example from Sheffield Beach, KwaZulu-Natal North Coast, South Africa

机译：在Dolerite Sill侵入期间的Breccia形成：来自南非夸祖鲁 - 北海岸谢菲尔德海滩的示例

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摘要

The breccia documented here is the first recorded occurrence of a sub-volcanic dolerite breccia developing due to the intrusion of overlapping dolerite sill segments in the Karoo Igneous Province (KIP) along the KwaZulu-Natal North Coast, South Africa. Recognising these breccias can assist in indicating the crustal level at which the dolerite sills intruded, as fragmentation of the country rocks will not occur beyond a certain depth. The breccia developed when two overlapping sill segments intruded into water-saturated Permian country rocks creating a laterally extending dolerite-hosted breccia. The characteristics of the breccia, such as clast angularity and size, have been used to identify the fragmentation process of the rocks and infer the environment where it formed. Fragmentation of the lithified country rock is considered to be a consequence of heating between the sills causing vapourisation of the pore fluids, resulting in a dramatic increase of pressure beyond the yield strength of the rock and lateral propagation of the fragmentation. This brecciation process indicates that the dolerites intruded at a high crustal level and were thus intruded into a thin or thinning crust, possibly related to the rifling phase of the breakup of the supercontinent Gondwana.
机译：这里记录的Breccia是第一个录制发生的次火山Dolerite Breccia，这是由于Karoo Igneous Province（Kip）沿南非南非夸祖鲁北部海岸的重叠Dolerite Sill段的侵扰。识别这些Breccias可以有助于指示侵入的潮流谱系的地壳水平，因为国家岩石的碎片不会发生在一定的深度之外。当两种重叠的比赛段侵入水饱和的二叠纪乡村岩石时，布雷西亚开发了一种横向延伸的Dolerite主持的Breccia。已经使用了Breccia的特性，例如夹紧角度和尺寸，用于识别岩石的碎片过程，并推断出形成的环境。岩石化的乡村岩石的碎片被认为是在引起孔隙流体蒸发的岩石之间加热的结果，导致压力的显着增加，超过岩石的屈服强度和碎裂的横向繁殖。这种布发过程表明Dolerites在高地壳水平处侵入，因此侵入到薄或稀薄的地壳中，可能与超大阴道的分解的束缚阶段有关。

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