Download e-book for iPad: A Practical Approach to Sedimentology by Roy Lindholm

By Roy Lindholm

ISBN-10: 9401176833

ISBN-13: 9789401176835

ISBN-10: 940117685X

ISBN-13: 9789401176859

This ebook is designed for a one-semester direction in sedimentology taken via complex undergraduate or graduate scholars. It supplies designated descriptions of sedimentary positive aspects and the analytical equipment used to judge them and is meant to help and make stronger ideas awarded in lectures. dialogue of rules and techniques is located in complimentary texts, resembling Leeder's (1982) Sedimentology: strategy and product and chosen readings in expert journals. This publication isn't really an exhaustive treatise of laboratory innovations and concept. the subject material comprises issues commonly coated in classes entitled "Sedimentology" or "Sedimentation". Sandstone and carbonate petrography is usually given in a separate path. moreover, this subject is roofed in different present texts. For those purposes i've got passed over petrographic tools, except for these making use of to heavy minerals. i've got incorporated a slightly wide dialogue of heavies simply because this subject is usually missing in most recent texts. each path in sedimentology is extremely individualistic and fabric lined varies with the pursuits, historical past, and viewpoint of the teacher. For those purposes a few subject matters awarded during this ebook will not be inevitably lined in all classes. equally a few teachers may well locate that their favourite subject is lacking. i will merely desire that this challenge is minimum. numerous chapters include special routines to be accomplished by way of the coed. a few needs to be performed within the school room, the place specimens can be found for research. Others will be performed open air of the study room.

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34 Convolute lamination: A, Brahmaputra River sediments (modified from Reineck & Singh 1975: Fig. 131). B, Precambrian fluvial sandstone (modified from Selley 1976: Fig. 83). -, ' . ~"Q,, ' . " ' ...... 35 Dish-and-pillar structures in sandstone. Pillars are more strongly developed in (b) than in (a). Both these samples are from the Jackfork Group, Pennsylvanian, Oklahoma. 5 m) sandstone beds is shown in (c). ) 34 STRUCTURES FROM SOFT-SEDIMENT DEFORMATION (b) Dish-and-pillar structure This structure is produced in rapidly deposited clay-rich sand and silt by the upward escape of water (dewatering) during consolidation.

This manifestation of load casts is called a flame structure, from the appearance of the curved and pointed tongues of shale (Fig. 31b). 31 Load casts: (a) on sole of bed; (b) flame structure in section normal to bedding (modified from Potter & Pettijohn 1963: Fig. 2). cases (Allen 1982b: 357). Irregularities on a muddy substrate may localize loading, as in the case of load-casted flutes, but this is not necessary for the development of load casts. When loading completely disrupts a sand bed, elliptical or kidneyshaped sand bodies are formed by collapse into the underlying mud.

Reverse grading also occurs in backwash laminae formed on beaches, and in coarse volcanoclastic deposits. The latter may result from increased volcanic activity or from the tendency for larger pumice particles to become waterlogged more slowly than smaller ones. g. g. deltaic and some shoreline deposits). This phenomenon results from the lateral migration of environments and is fundamentally different from the graded beds described in (a) and (b) above. g. g. changes in sea level). 5 Massive bedding (also called homogeneous bedding) Some beds that show no obvious sedimentary structures are in fact laminated or cross bedded as revealed when rock slabs are X-rayed (Hamblin 1962).

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A Practical Approach to Sedimentology by Roy Lindholm

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