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首页> 外文期刊>Journal of structural geology >Distinguishing syn-cleavage folds from pre-cleavage folds to which cleavage is virtually axial planar: examples from the Cambrian core of the Lower Palaeozoic Anglo-Brabant Deformation Belt (Belgium)
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Distinguishing syn-cleavage folds from pre-cleavage folds to which cleavage is virtually axial planar: examples from the Cambrian core of the Lower Palaeozoic Anglo-Brabant Deformation Belt (Belgium)

机译：将同卵裂褶皱与前卵裂褶皱区分为实际上是轴向平面的：下古生界盎格鲁-布拉班特变形带（比利时）的寒武纪岩心实例

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摘要

Within the Cambrian Jodoigne Formation in the easternmost part of the Anglo-Brabant Deformation Belt, sub-horizontal to gently plunging folds occur within the limbs of steeply plunging folds. The latter folds are cogenetic with cleavage and are attributed to the Brabantian deformation event. In contrast, although cleavage is also (1) virtually axial planar to the sub-horizontal to gently plunging higher-order folds, shows (2) a well-developed divergent fanning across these folds, (3) an opposing sense of cleavage refraction on opposite fold limbs, and (4) only very small cleavage transection angles, an analysis of the cleavage/bedding intersection lineation suggests that these higher-order folds have a pre-cleavage origin. On the basis of a comparison of structural and sedimentological features these higher-order folds are interpreted as slump folds. The seemingly 'normal' cleavage/fold relationship across the slump folds within the limbs of the large steeply plunging folds is due to the very small angle between cleavage and bedding. As such, a 'normal' cleavage/fold relationship is no guarantee for a syn-cleavage fold origin. It is not unlikely that also within undeformed, recumbent slump folds, a well-developed compaction fabric, formed parallel to the axial surface of the slump folds, may show fanning and contrasting senses of cleavage refraction on opposite fold limbs.
机译：在盎格鲁-布拉班特变形带最东部的寒武纪乔杜涅组内，在陡倾褶皱的四肢中出现了亚水平至轻倾褶皱。后者的褶皱与裂隙共生，并归因于布拉班式变形事件。相比之下，尽管劈裂也（1）基本上是在水平以下轴轴向平缓地向高阶褶皱倾斜，但显示（2）这些褶皱上发育良好的发散扇形，（3）劈裂折射的方向相反（4）仅很小的卵裂横切角，对卵裂/层理相交线的分析表明，这些较高阶的褶皱起源于卵裂前。根据结构和沉积学特征的比较，这些高阶褶皱被解释为坍落褶皱。陡峭的大褶皱的四肢内部塌陷褶皱上看似“正常”的劈裂/褶皱关系是由于劈裂和层理之间的夹角很小。因此，“正常”切割/折叠关系不能保证syn-切割折叠起点。在未变形的，倾斜的坍落褶皱内，与塌陷褶皱的轴向表面平行形成的发达的压实织物，也可能在相对的褶皱肢体上显示出扇形和对比的裂隙折射，这也不是不可能。

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