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首页> 外文期刊>South African journal of geology >Characteristics of jointing in the Malmesbury Group, Harbour area, Cape Town
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Characteristics of jointing in the Malmesbury Group, Harbour area, Cape Town

机译：开普敦海港区马姆斯伯里组的接合特征

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摘要

A survey of joints in greywackes of the Malmesbury Group, Tygerberg Formation was carried out in connection with redevelopment of the old oil storage quarry site, Cape Town Harbour. Five distinct sets of joints were identified by differences in characteristics and orientations; Jp parallel to the steeply dipping bedding/cleavage, Jh sub-horizontal stress relief joints, J2 extensional vertical cross joints, and J1 and J3 oblique shear joints. J1 and J3 are developed locally in proximity to strike-slip and thrust faults and vary at different localities. Comparison with joints in other Tygerberg Formation lithologies, at Bloubergstrand and other published studies, suggests that Jp, Jh, and J2 type joint sets are ubiquitous in the Malmesbury Group throughout the Cape Peninsula area. Jp joints are generally planar with 6-15 m continuity, whereas the J2 cross joints have low continuity and stepped surfaces. Jh 'sheeted' joints are irregular with wider openings. A seepage of water and oil was investigated and average opening widths, spacing, and proportions of oil stained joints for each set were used to estimate average void volumes and the total volume of oil contamination remaining in the rock mass.
机译：与旧石油存储采石场开普敦海港的重建有关，对马姆斯伯里集团泰格伯格组的灰w关节进行了调查。通过特征和方向的不同可以识别出五组不同的关节。 Jp平行于陡倾层理/解理，Jh副水平应力消除接头，J2延伸垂直交叉接头以及J1和J3斜剪力接头。 J1和J3在走滑和逆冲断层附近局部发育，并在不同位置变化。在Bloubergstrand和其他已发表的研究中，与其他Tygerberg地层岩性的关节相比较，表明Jp，Jh和J2型关节组在整个开普半岛地区的Malmesbury组中普遍存在。 Jp接头通常是平面的，具有6-15 m的连续性，而J2十字接头的连续性低且具有阶梯状表面。 Jh“片状”接头是不规则的，具有较大的开口。研究了水和油的渗漏，并使用每组的平均开口宽度，间距和沾油接头的比例来估计平均孔隙体积和残留在岩体中的油污染总量。

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  • 来源
    《South African journal of geology》 |1995年第2期|p.224-231|共8页
  • 作者

    C.W. Stowe;

  • 作者单位

    Department of Geological Sciences, University of Cape Town, Rondebosch, 7700 Republic of South Africa;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
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