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Chapter 12 Neoproterozoic glaciogenic diamictites of the Katanga Supergroup, Central Africa - Photograph supplement

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Title: Chapter 12 Neoproterozoic glaciogenic diamictites of the Katanga Supergroup, Central Africa - Photograph supplement
Author: Wendorff, Marek
Abstract: Companion photographs to the book chapter Master, Sharad and Wendorff, Marek. 2011. “Neoproterozoic glaciogenic diamictites of the Katanga Supergroup, Central Africa.” In: Arnaud, E., Halverson, G. P. and Shields-Zhou, G. (eds) The Geological Record of Neoproterozoic Glaciations. Geological Society, London, Memoirs, 36, 173-184.
URI: http://hdl.handle.net/10214/9375
Date: 2011
Rights Holder: The copyright of the photos rests with the author(s) of the chapter or, where stated, the person who took the photo.The copyright of the photos rests with the author(s) of the chapter or, where stated, the person who took the photo.


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Ch12_Fig_1_Wendorff.jpg 220.9Kb JPEG image Thumbnail Katanga Supergroup, Grand Conglomerat Fm. Mansa area (Bangweulu Block – N margin of the Roan rift), NE Zambia. Glaciofluvial, large-scale trough cross-bedded, poorly-sorted pebbly sandstone overlain by irregular layer of unsorted debris of pebbles to blocks 1.2 m across, ranging in shape from rounded to angular and derived from pre-Katangan basement (granite, quartzite and porphyry). Outcrop in the Lueba River, a tributary of the Luapula River; coord. S11o21'54.2" E28o30'22". Pencil for scale is 13 cm long. Cross-bedding shows palaeotransport to SWS (Photo credit: Marek Wendorff).
Ch12_Fig_2_Wendorff.jpg 126.5Kb JPEG image Thumbnail Katanga Supergroup, Grand Conglomerat Fm. east of the Kafue Anticline, S part of the Roan rift. Itawa (Zambia), borehole IT28, depth 1161-1182 ft. Massive rain-out diamictite with randomly oriented clasts ranging from cobbles to granules embedded in dark grey mudstone matrix; note vertical position of elongated cobble of white Roan-derived dolomite (left). Preferential orientation of elongated clasts (right) is interpreted as post-depositional modification by debris flow (Photo credit: Marek Wendorff).
Ch12_Fig_3_Wendorff.jpg 152.2Kb JPEG image Thumbnail Katanga Supergroup, Grand Conglomerat Fm. Diamictite facies at Itawa, borehole IT28 (Zambia). Left: Sedimentary breccia containing clasts of grey and black mudstone and silty mudstone, which are identical with the lithologies that occur in the succession below. Matrix ranges from mudstone to muddy sandstone. Some of the mudstone clasts contain angular fine pebbles and granules of Roan dolomite and quartzite. Interpretation: intrabasinal debris flow generated by slumping of rain-out facies. Depth 1309 ft. Centre: Massive rain-out diamictite with randomly oriented clasts ranging in size from pebbles to granules. Depth 1149 ft. Right: Two layers of matrix-supported polymictic diamictite of similar composition and texture, but with contrasting structures, separated by a sharp boundary (indicated by dashed line): preferential orientation of elongated clasts and crude inverse grading of the coarsest clasts in the lower layer suggest a post-depositional modification of rain-out diamictite by remobilisation and transport as debris flow; intact/unmodified massive rain-out diamictite above overlies the modified diamictite. Depth 1133 ft. (Photo credit: Marek Wendorff)
Ch12_Fig_4_Wendorff.jpg 156.4Kb JPEG image Thumbnail Katanga Supergroup, Grand Conglomerat Fm. (Itawa, borehole IT25; Zambia). Left: Synsedimentary deformations – small folds and liquefaction of sand layers (depth 1464 feet). Centre: Small synsedimentary slump fold, which deforms interlaminated mudstone and siltstone and truncates fine-grained, current-ripple laminated sandstone below. The overlying dark grey mudstone interlaminated with siltstone, thickening to the right and away from the fold nose, was deposited after slumping. Depth 1421 ft. Right: Nose of medium-size slump fold deforming a succession composed of: interlaminated mudstone and siltstone (dark grey at the sample base) - fine-grained sandstone (medium grey) - siltstone (whitish, thinly laminated) - sandy mudstone (medium grey, along the upper left margin of the core). Depth 1249 ft.). (Photo credit: Marek Wendorff)
Ch12_Fig_5_Wendorff.jpg 155.8Kb JPEG image Thumbnail Katanga Supergroup, Grand Conglomerat Fm. (Mokambo, borehole Ks17; Zambia). Left: Massive diamictite: mud-rich sandstone (wacke) containing abundant dropstones of granules and rare pebbles of Roan dolomite (white), depth 2050 ft. Centre: Massive diamictite composed of granules embedded in clay matrix; a Roan-derived dropstone (white) is loaded into the base of a silty mudstone interlayer. Depth 2021 ft. Right: Soft sediment deformations of mudstone (black) interbedded with muddy siltstone (grey) containing polymictic dropstones of basement granite, white and light grey Roan dolomite, and fine clasts of black shales of Mwashya. Depth 2027 ft. (Photo credit: Marek Wendorff)
Ch12_Fig_6_Wendorff.jpg 187.5Kb JPEG image Thumbnail Katanga Supergroup, Grand Conglomerat Fm. Laminated silty mudstone with wisps of siltstone (white), lenticles of solitary/starved current ripplemarks of very fine-grained sandstone deposited by weak traction currents and fine rain-out/dropstone pebbles and granules of quartzite. Note deformation by loading of dropstones into the underlying laminae. Chambishi, borehole NN51 (Zambia), depth 232 m. The specimen illustrates a condensed section of the glaciogenic facies deposited at the top of the Kafue Anticline, which already formed a horst during the Grand Conglomerate glaciation. (Photo credit: Marek Wendorff)
Ch12_Fig_7_Wendorff.jpg 235.2Kb JPEG image Thumbnail Katanga Supergroup, Nguba Group conglomerate unit containing interlayers of the Grand Conglomerat glacial diamictite in the Mushishima River area, west of the Kafue Anticline, S part of the Roan rift, Zambia. Close-up of matrix-supported massive debris flow conglomerate; whitish cobble left-of-centre is laminated dolomite of Roan derivation. (Photo credit: Marek Wendorff)
Ch12_Fig_8_Wendorff.jpg 241.1Kb JPEG image Thumbnail Katanga Supergroup, Nguba Group conglomerate unit containing interlayers of the Grand Conglomerat glacial diamictite in the Mushishima River area, west of the Kafue Anticline, S part of the Roan rift, Zambia. Matrix-poor conglomerate with Roan-derived clasts ranging from subangular to subrounded and interpreted as rigid plug in debris flow is overlain at the hammer-head level by very thick, matrix-rich, massive debris flow conglomerate with lower boundary uneven, erosional and deformed by loading. (Photo credit: Marek Wendorff)

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