Sedimentary structures and textures of Río Orinoco channel sands, Venezuela and Colombia

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Sedimentation and deposition -- Orinoco River (Venezuela and Colo

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Orinoco River (Venezuela and Colo

Statementby Edwin D. McKee.
SeriesWaters and sediments of the Río Orinoco and its major tributaries, Venezuela and Colombia ;, ch. B, U.S. Geological Survey water-supply paper ;, 2326-B
ContributionsVenezuela. Ministerio del Ambiente y de los Recursos Naturales Renovables.
Classifications
LC ClassificationsGB719.V4 W37 1989 ch.B, QE571 W37 1989 ch.B
The Physical Object
Paginationviii, 23 p. :
ID Numbers
Open LibraryOL2147932M
LC Control Number88600423

Get this from a library. Sedimentary structures and textures of Río Orinoco channel sands, Venezuela and Colombia. [Edwin D McKee; Venezuela. Ministerio del Ambiente y Venezuela and Colombia book los Recursos Naturales Renovables.].

Sedimentary Structures and Textures of Rfo Orinoco Channel Sands, Venezuela and Colombia By EDWIN D. McKEE Prepared in cooperation with the Venezuelan Ministerio del Ambiente y de los Recursos Naturales Renovables U.S.

GEOLOGICAL SURVEY WATER-SUPPLY PAPER THE WATERS AND SEDIMENTS OF THE RIO ORINOCO ANDCited by: 3. Most sedimentary structures represented in sand bodies of the Rio Orinoco are tabular-planar cross-strata which, together with some wedge-planar cross-strata, are the products of sand-wave deposition.

Locally, in areas of river meander where point bars characteristically form, trough structures forming festoon patterns are numerous.

At a few localities, sets of nearly horizontal strata occur. Sedimentary structures and textures of Río Orinoco channel sands, Venezuela and Colombia by Edwin D. McKee (Waters and sediments of the Río Orinoco and its major tributaries, Venezuela and Colombia, ch.

B) (U.S. Geological Survey water-supply paper, B) U.S. G.P.O.: For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Cited by: 3. Sedimentary structures and textures of Rio Orinoco channel sands, Venezuela and Colombia. The majority of the sedimentary structures in the channel sands of the Orinoco.

Major river, South America. It rises on the western slopes of the Parima Mountains along the border between Venezuela and Brazil. It flows in a giant arc through Venezuela for about 1, mi (2, km) and enters the Atlantic Ocean near the.

Book; Commercial Publisher: Darwin, C., Sedimentary Structures and Textures of Río Orinoco Channel Sands, Venezuela and Colombia. U.S. Chapter 3 SEDIMENTARY STRUCTURES 1.

INTRODUCTION You might have heard us define structure in rocks as rock geometry on a scale much larger than is a singularly unilluminating definition, be-cause it doesn't conjure up in the mind of the uninitiated any of the great variety of interesting and significant geometries that get produced by the physical, chemical.

Sedimentary rock - Sedimentary rock - Classification of sandstones: There are many different systems of classifying sandstones, but the most commonly used schemes incorporate both texture (the presence and amount of either interstitial matrix—i.e., clasts with diameters finer than millimetre—or chemical cement) and mineralogy (the relative amount of quartz and the relative abundance.

Sand waves, bars, and wind- blown sands of the Rio Orinoco, Venezuela and Colombia. United States Geological Survey, Watea'-Supply Paper A, Petr61eos de Venezuela, S.A. () Evaluaei6n exploratoria de la Faja Petrolffera del Orinoco.

The Sedimentary Rock Textures Chart on the following illustrates the major sedimentary rock textures. Below, we define a few of the terms geologists use to describe these textures. ♦ Clastic texture: grains or clasts do not interlock but rather are piled together and cemented.

Sedimentary Sequences A sequence is a vertical succession of sedimentary structures that represents a change in depositional conditions over a period of time. Virtually every depositional environment can be distinguished by its characteristic sequence of deposition and sedimentary structures.

Sedimentary rock - Sedimentary rock - Sedimentary structures: Sedimentary structures are the larger, generally three-dimensional physical features of sedimentary rocks; they are best seen in outcrop or in large hand specimens rather than through a microscope. Sedimentary structures include features like bedding, ripple marks, fossil tracks and trails, and mud cracks.

Sedimentary Structures. Sedimentary structures are visible features within sedimentary rocks that formed at the time of deposition and represent manifestations of the physical and biological processes that operated in depositional environments. The most commonly observed sedimentary structure is.

Sedimentary rock - Sedimentary rock - Fabric: The fabric of a sedimentary rock controls the rock’s porosity and permeability and therefore its ability to hold and/or transmit fluids such as oil and water. The orientation, or lack thereof, of the crystals or grains that make up a sedimentary rock constitutes one aspect of fabric.

Genetically, there are two principal varieties of oriented. Sedimentary rock - Sedimentary rock - Classification systems: In general, geologists have attempted to classify sedimentary rocks on a natural basis, but some schemes have genetic implications (i.e.,knowledge of origin of a particular rock type is assumed), and many classifications reflect the philosophy, training, and experience of those who propound them.

topics covered introduction formation classification textures structures important sedimentary rocks engineering importance 3.

Description Sedimentary structures and textures of Río Orinoco channel sands, Venezuela and Colombia PDF

Sedimentary rocks are the type of rocks that are formed by the deposition of material at earth's surface and within the bodies of rocks. Contributes about 8% of total volume of crust. According to the criteria developed by Miall (), preceding core description findings for the Eastern Venezuela Basin (Labourdette et al., ; Martinius et al., ), and sedimentary texture and structure, we achieved lithofacies classification for the Morichal and Yabo members in the cored Wells D and E.

The lithofacies identified. Sediment and Sedimentary Rocks Sedimentary Rocks Rivers, oceans, winds, and rain runoff all have the ability to carry the particles washed off of eroding rocks. Such material, called detritus, consists of fragments of rocks and minerals.

Download Sedimentary structures and textures of Río Orinoco channel sands, Venezuela and Colombia FB2

When the energy of the transporting current is not strong enough to carry these particles, the. Chemical sedimentary rocks are crystalline, that is made of crystals interlocked with each other. Conceptually, that is the same texture we see in igneous and metamorphic rocks, but NOT in clastic sedimentary rocks.

Chemical sedimentary rocks form because of the precipitation of crystals from aqueous (water) solutions and from chemical residues. Exercise Interpretation of Past Environments. Sedimentary rocks can tell us a great deal about the environmental conditions that existed during the time of their formation.

Make some inferences about the source rock, weathering, sediment transportation, and deposition conditions that existed during the formation of the following rocks. Sedimentary rock - Sedimentary rock - Sandstones: Sandstones are siliciclastic sedimentary rocks that consist mainly of sand-size grains (clast diameters from 2 to millimetre) either bonded together by interstitial chemical cement or lithified into a cohesive rock by the compaction of the sand-size framework component together with any interstitial primary (detrital) and secondary.

INTERNAL BEDDING STRUCTURES These are sedimentary structures which are best seen looking at a side view of a sedimentary rock or sequence of sedimentary rocks.

Stratification (or layering) is the most obvious feature of sedimentary rocks. The layers (or strata) are visible because of differences in the color or texture of adjacent beds. SEDIMENTARY STRUCTURES: large, outcrop-scale features that develop during deposition of a sedimentary layer.

TYPES 1. Stratification--layering is most common 2. Raindrop imprints, ripple marks, cross-bedding--useful in determining direction and vigor of sediment transport.

graded bedding--typical of undersea avalanches called turbidity currents. sedimentary bed that might tell you something about depositional environment: grain size grain shape grain surface texture grain fabric sedimentary structures composition (siliciclastic; carbonate, evaporite, coal, chert) fossils (body fossils, trace fossils) stratification sequence sediment-body geometry/architecture.

Sedimentary Structures and Textures of Río Orinoco Channel Sands, Venezuela and Colombia. U.S. Geological Survey Water-Supply Paper WB, pp. B1-B Mehta, A.J. and Montague, C.L., A Brief Review of Flow Circulation in The Vicinity of Natural and Jettied Inlets: Tentative Observations on Implications for.

What is a delta. A delta is a region characterized by an arid climate, little vegetation, and a lack of water bodies.

A delta is a triangular landform created where a stream enters a body of water and deposits sediment. Geol. Soc. Amer. Mem.McKee E. () The Waters and Sediments of the Rio Orinoco and its Major Tributaries, Venezuela and Colombia, Chapter B, Sedimentary structures and textures of Rio Orinoco channel sands, Venezuela and Colombia.

U.S.G.S. Water Supply PaperBI-B   Many different physical sedimentary structures form as a result of sedimentary particles interacting with their surrounding environment. One simple example is a modern lake that has dried up, so that the mud on the bottom of the lake has lost its water by evaporation and has desiccated and developed a pattern of polygonal cracks (Fig.

Details Sedimentary structures and textures of Río Orinoco channel sands, Venezuela and Colombia EPUB

Sediment and water discharge in Rio Orinoco, Venezuela and Colombia. In: Proceedings of the Second International Symposium on River Sedimentation, OctoberNanjing, China, pp. Water Resources and Electric Power Press, Beijing. Sedimentary rocks are types of rock that are formed by the accumulation or deposition of small particles and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth's surface.

Sedimentation is the collective name for processes that cause these particles to settle in place. The particles that form a sedimentary rock are called sediment.Sedimentary Structures! Bed Surface Markings!

Mud Cracks - drying out of the top of a bed. The cracks later become filled with sediment and the structure is preserved.! Load (Lode) Casts - These are bulbous protrusions that are formed when compaction causes sediment to be pushed downward into softer sediment Fossils.!

33 Sedimentary Structures!Crystalline and skeletal textures are subdivided as with clastic textures into coarse (greater than 2 mm), medium (1/16 to 2 mm) and fine (less than 1/16 mm). Sedimentary Environments of Deposition. Following is a brief guide to the properties of sedimentary rocks deposited within various sedimentary .