Evidence for soft-sediment deformation—the Duwaysah Slide of the Gargaf Arch, central Libya

Remote sensing and field analysis of the Palaeozoic structural style in NW Libya: The Qarqaf arch a paleo-transfer fault zone between the Ghadamis and Murzuq basins

“…Our observation of fold related to normal fault and generalized Palaeozoic extension linked to strike-slip regime contradicts the description by Glover et al (2000) of compressive folds in Devonian outcrops and our mapping of other folds in the Carboniferous immediately northwest of the arch (Fig. 16).…”

“…Our model of distribution and age of fault systems is a key issue for geometric basinal analysis of traps distribution in the Ghadamis and Murzuq basins. Faults related to syn-depositional extension in rift basins generally control local variations in sediment facies and thickness, as demonstrated by Adamson et al (2000) in the Murzuq basin. Our model should help finding these variations along major normal faults.…”

“…We did not find any associate strike-slip fault. Glover et al (2000) have described in the western end of the arch closure Devonian layers affected by extensional listric growth faults and associated compressional leading edge folds including sheath folds. They deduced that soft deposits slid at the end of their deposition over the uplifting and tilting monoclinal Devonian layers.…”

Subglacial deformation and water-pressure cycles as a key for understanding ice stream dynamics: evidence from the Late Ordovician succession of the Djado Basin (Niger)

“…Such features would have been oriented normal to the displacement direction for both synthetic and antithetic faults, as suggested by Deynoux and Ghienne (2004). Thin sections made by Glover et al (2000) across extensional microfaults in similar material show that they result from frictional grain boundary sliding and repacking without cataclasis; this demonstrates the early character of the type of deformation affecting both lithified and soft sediments. The contrast between the brittle deformation structures of SSZ 1 (Fig.…”

Late Ordovician glaciogenic reservoir heterogeneity: An example from the Murzuq Basin, Libya

“…7, for summary). Glover et al (2000) interpreted the broad, open antiforms in this western sector to result from compression at the toe of a gravity slide, with upslope extension having formed the half-graben. Ghienne et al (2003) attributed extension to glacioisostatic rebound.…”