thrust sheet


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thrust sheet

[′thrəst ‚shēt]
(geology)
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The frontal part of this thrust sheet extends 20 km to the east of the study area, close to the Millahue fault (Fig.
These nonmarine, time-transgressive molasses facies represent the erosional products of southward advancing Himalayan thrust sheets. Marwat Range lies immediately south of the Bannu Basin and outcropping in the form of broad anticline known as Marwat Anticline.
Thrust variations in structural geometry along strike of the range can be explained in terms of ramping nature and motion along thrust sheet. The mountain front in the west in the vicinity of Pannu is interpreted as a fault bend fold that lacks its frontal limb (Suppe 1983).
Most of the macro- scale anticlines constitute the hanging wall thrust sheet of the emergent and non-emergent thrust faults in both the ranges.
The ophiolite is one of the three major thrust sheets derived from the Neothyteys and emplaced onto the western passive-margin outer shelf of the Indian Plate in Pakistan.
The Waziristan-Kurram Block consists of a tectonic collage of thrust sheets derived from the shelf-oceanic basin transition zone in the Neotethys at the western margin of the Indian Plate and includes 1) Tani Formation, 2) dismembered ophiolite, 3) Triassic-Palaeocene Kurram-Khaisora Group and 4) Cretaceous Kahi Group (Satara-Zakha, Shinkai Post and Khajori Post formations), with Indian Plate passive-margin inner shelf autochthonous sequence exposed in window structures beneath these thrust sheets.
(2) Muscovite from the uppermost Lesser Himalayan thrust sheet commonly preserves pre-Cenozoic 40Ar/39Ar ages revealed as old age steps produced during step heating analyses (summarized by Herman et al., 2010).
The trailing edge of the thrust sheet is imbricated to form oil-field structures comprising fault-related folds, triangle zones, and pop-up structures.
Three thrust sheets were penetrated by the two holes, repeating the transition from Horse Canyon formation to Wenban formation in each.
The northward movement of Indian Plate with respect to stable Asia is still going on at a rate of 42mm/year (Leathers, 1987).Shortening is manifested by stacking of thrust sheets (Figure 4), which progressively shifted from north to south.
It holds three oil fields, including Santa Cruz, where horizontal wells on the shoreline tap deep into a stack of carbonated thrust sheets offshore.
Recent drilling in the Vanuatu forearc of the southwest Pacific (the leading edge of Fiji microplate) unequivocally demonstrates the accretion of sediments and mid-ocean ridge volcanic rocks as discrete thrust sheets that form a frontal accretionary prism.