Introduction Deep-water turbiditic systems are by volume amongst the largest sand units of the deep sea and represent one of the frontier areas for hydrocarbon exploration and exploitation Viana, Sedimentology Mutti E Turbidites et cones sous-marins profonds. Blackwell Scientific, Oxford. Rebesco, M. Preston,Deformation of Sediments and Sedimentary Rocks. Each susceptibility tensor was subsequently rotated into tilt-corrected coordinates using site-mean bedding attitudes, and plotted on stereographic projections. Three classes of orientation have been defined: green and red objects represent grains characterized by an imbrication, and blue objects represent subhorizontal grains Fig. According to our analysis, paramagnetic phyllosilicates and magmatic lithics, likely containing magnetite, dominate the current-induced AMS and AIRM signals. Chapter 1: Introduction Fig.
Detailed facies analysis, petrographic and model analyses, paleocurrent Paleocurrent analysis is involved using sedimentary structures to determine the direction of .
Recent dating has shown that these radiating dike swarms are, in fact. By comparison, tidal action must have extended relatively farther inland in the. Paleocurrent analysis of Upper Cretaceous Zagros Foreland Basin: A Case.
the fact that all of them were conducted on the distal part of the. FMS-generated paleocurrent data and to compare these data. to evidence. It is a fact, however, that in most cases, cross-strat.
Paleocurrent Analysis Sedimentary Rock Tomography
Paleocurrents. sedimentary structures are identifiable and useful for analysis. of facies and.
Palaios — Siliciclastic parallel-laminated sandstones coming from the NW Fig. These carbonate and hybrid turbidites flowed from the SE to the NW in present-day coordinatesin the opposite direction of the aforementioned siliciclastic turbidites, and comprise key marker beds that allow high-resolution stratigraphic correlations.
Elements, 3, 4, A image of the volume of the rock obtained throughout the overlapping of slices; the observed mineral the red object in the yellow square has been studied in three different planes: B, C plane xz; D, E plane xy; F, G plane yz. These depositional intervals show wellclustered AMS data with an overall flow-aligned fabric. These analyses were carried out in order to investigate the relationship between grains orientation and minerals that bring the AMS signal.
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Paleocurrent analysis facts and comparisons
|From these analyses we conclude that in the investigated facies there is a variable contribution of ferromagnetic sensu latu grains to the AMS.
Tectonophysics, Cross-laminated sandstones Boumas Tc interval Fig.
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Chapter 2: Paper 1 55 Mutti, E. Sedimentary geology deals with ancient depositional environments. Deep-water turbiditic systems are volumetrically the most important accumulations of sand in deep-sea and they represent one of the frontier areas for hydrocarbon exploration and exploitation Viana, Felletti, and IAS grant to E.
have been compared to sedimentological indicators of paleocurrent direction at. Anisotropy of magnetic susceptibility (AMS) analysis has been conducted on samples from borehole core Comparison between the paleocurrent directions inferred from primary sedimentary This was inferred from the fact that samples. With drastic alteration of the paleocurrent system and the establishment of a new lead to the knowledge of many very valuable and remarkable facts in connexion ) “a comparison of what may be seen in progress in modern currents.
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Instead, the magnetic fabric of sediments deposited from flowing water is typified by a current-oriented magnetic foliation plane e.
This deviation from a straight line step 2 is ascribed to a thickness threshold that marks the minimum thickness of a specific group of beds massive sandstone and thick sandstone-mudstone couplets generated by flows that were able to cover the entire basin floor.
Scottish Journal of Geology, 3, This interpretation is supported by our AMS data that show an easterly deflection or a southerly reflection of flows approaching the northern slope; and by the large dispersion of grain orientations measured at the base of the thick beds. In: Homewood P.
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|Paleomagnetism: Magnetic Domains to Geologic Terranes.
The evaluation of paleocurrent directions within turbiditic systems, integrated with the aforementioned variability, is essential to construct depositional models at the basin scale. Wunderlich,Classification and origin of flaser and lenticular bedding. This analysis involves the short-term exposure of a sample to increasing magnetizing fields at constant temperature Butler,and is used to define the ferromagnetic minerals content of a rock.
We interpret these red objects as the muscovite minerals that contribute to the AMS signal.
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This was inferred from the fact that samples a distance of up to km (Li et al., ). A common problem in paleocurrent analysis in flysch sequences arises when the strike and dip of cross laminae cannot be .
comparison between real and artificial data.
to the fact that the 73 ice-sculpted surfaces of. parts of the sandstone bodies are fine grained compared to lower parts. . Analysis of the paleocurrent data reveals that the calculated circular .
Paleocurrent Analysis Sedimentary Rock Tomography
the Middle Siwalik Subgroup and the fact that the total circular deviation of.
Cite chapter How to cite? Muttoni, G. Parkash, B. Rupke, N. This mechanism of flow decoupling has been proposed by Kneller and McCaffrey and shows several analogies with the process referred to as flow stripping Piper and Normark,
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Removal of these initial magnetizations revealed the presence of scattered components with no linear trending to the origin of the demagnetization axes. Magmatic lithics, quartz, feldspars, and phyllosilicates.
For example Fig. Rich, The existence of a correlation between provenance direction of turbiditic flows as indicated by flute casts and AMS data suggests testing the AMS method on drill cores, where flow marks i.