June 15, 2021

Download Ebook Free Mass Transport, Gravity Flows, And Bottom Currents

Mass Transport, Gravity Flows, and Bottom Currents

Mass Transport, Gravity Flows, and Bottom Currents
Author : G. Shanmugam
Publisher : Elsevier
Release Date : 2020-11-02
Category : Science
Total pages :608
GET BOOK

Mass Transport, Gravity Flows, and Bottom Currents: Downslope and Alongslope Processes and Deposits focuses solely on important downslope and alongslope processes. The book provides clear definitions and characteristics based on soil mechanics, fluid mechanics and sediment concentration by volume. It addresses Slides, Slumps, and Debris Flows, Grain Flows, Liquefied/Fluidized Flows, and Turbidity Currents, Density plumes, Hyperpycnal Flows, the Triggering Mechanisms of Downslope Processes, Bottom Currents, and Soft-Sediment Deformation Structures. The mechanics of each process are described in detail and used to provide empirically-driven categories to help recognize these deposits it the rock record. Case studies clearly illustrate of the problems inherent in recognizing these processes in the rock record, and potential solutions are provided alongside future avenues of research. An appendix also provides step-by-step guidance in describing and interpreting sediments. Comprehensively addresses modern downslope and alongslope processes, including definitions and mechanisms Provides key criteria for the recognition of depositional facies in the rock record Includes case studies to illustrate each downslope and alongslope process Identifies key problems and potential solutions for future research Uses pragmatic, empirical, data-driven interpretations to revise conventional facies models

Encyclopedia of Geology

Encyclopedia of Geology
Author : Anonim
Publisher : Academic Press
Release Date : 2020-12-16
Category : Science
Total pages :5622
GET BOOK

Encyclopedia of Geology, Second Edition presents in six volumes state-of-the-art reviews on the various aspects of geologic research, all of which have moved on considerably since the writing of the first edition. New areas of discussion include extinctions, origins of life, plate tectonics and its influence on faunal provinces, new types of mineral and hydrocarbon deposits, new methods of dating rocks, and geological processes. Users will find this to be a fundamental resource for teachers and students of geology, as well as researchers and non-geology professionals seeking up-to-date reviews of geologic research. Provides a comprehensive and accessible one-stop shop for information on the subject of geology, explaining methodologies and technical jargon used in the field Highlights connections between geology and other physical and biological sciences, tackling research problems that span multiple fields Fills a critical gap of information in a field that has seen significant progress in past years Presents an ideal reference for a wide range of scientists in earth and environmental areas of study

Aquatic Sciences and Fisheries Abstracts

Aquatic Sciences and Fisheries Abstracts
Author : Anonim
Publisher : Unknown
Release Date : 1992
Category : Aquatic biology
Total pages :129
GET BOOK

Sedimentation in Submarine Canyons, Fans, and Trenches

Sedimentation in Submarine Canyons, Fans, and Trenches
Author : Daniel J. Stanley,Gilbert Kelling
Publisher : Unknown
Release Date : 1978
Category : Arcs insulaires
Total pages :395
GET BOOK

The Influence of Bottom Currents on the Sedimentary Evolution of the Alboran Sea During the Pliocene and Quaternary

The Influence of Bottom Currents on the Sedimentary Evolution of the Alboran Sea During the Pliocene and Quaternary
Author : Carmen Juan Valenzuela
Publisher : Unknown
Release Date : 2016
Category :
Total pages :351
GET BOOK

"An interdisciplinary study of the geomorphology, sedimentology, stratigraphy and physical oceanography of the deep-sea environments of the Alboran Sea (south-western Mediterranean Sea) has been carried out with the purpose of evidencing and understanding the role of bottom currents in the sedimentary evolution of the Spanish and Moroccan continental margins and adjacent basins during the Pliocene and Quaternary. This study was conducted using swath bathymetry data, more than 1900 profiles consisting of parametric, single- and multi-channel seismic records, scientific and commercial wells, sediment cores, and hydrographic data comprising: Conductivity, Temperature and Depth (CTD) profiles, Acoustic Doppler Current (ADCP) profiles, and EK60 echograms. Here, for the first time, a morphosedimentary scenario with a wide spectrum of depositional (plastered, sheeted, channel-related, mounded confined, elongated and separated drifts) and erosional (terraces, escarpments, moats, channels and furrows) contourite features are described in the Alboran Sea, from the shelf break to the basin floor. Hydrographic data offers new insights into the distribution of the Mediterranean water masses, and reveals that the bottom circulation of the Western Intermediate Water (WIW) and the Levantine Intermediate Water (LIW) interact with the Spanish slope, and the Western Mediterranean Deep Water (WMDW) with the Moroccan slope, Spanish base- of-slope and deep basins. The integration of distinct datasets and approaches allow a new sedimentary model to be proposed for the Alboran Sea that underlines the significance of bottom current processes in shaping deep-sea morphology. This model suggests that the bottom circulation of water masses governs physiography that the interface positions of water-masses with contrasting densities sculpt terraces at a regional scale, and that morphological obstacles play an essential role in the local control of processes and water- mass distribution. An analysis of the seismic stratigraphy from the Pliocene and Quaternary sequences has enabled to update and rename the stratigraphic boundaries and establish a new seismic stratigraphy for the Alboran Sea, after relocating the base of the Quaternary from 1.8 to 2.6Ma. Additionally, the seismic analysis involves the presentation and discussion for the first time of the evidence for contourite features reaching the scale of the Alboran Basin. Contourite drifts (plastered, sheeted, elongated separated and confined mounded drifts) and erosive features (terraces, escarpments, moats, channels, furrows) were developed under the continuous influence of Mediterranean water masses after the opening of the Strait of Gibraltar ( -5.33Ma). At least two primary factors have controlled the contourite features in this sea: i) tectonics, which has governed the relocation of the main Mediterranean flow pathways and their circulation patterns; and ii) climate, which has influenced both water-mass conditions (depth and density contrast of the interfaces) and hinterland sediment sources, conditioning the morphoseismic expression and growth pattern of drifts and terrace formation (dimensions). The distribution of contourite features through time and space allows to propose three main scenarios for ocean circulation since the opening of the Strait of Gibraltar: i) Atlantic Zanclean flooding; ii) the Pliocene sea, with two different stages for the dense circulation and characterised by poorly-defined and unstable interfaces for the Atlantic Waters (AW), light and dense Mediterranean waters and the presence of a strong countercurrent in the Western Basin; and iii) the Quaternary sea, characterised by tabular Mediterranean water masses with multiple current dynamics, increasingly important density contrasts, and climate shifts causing major vertical and horizontal displacement of the interfaces. These stages reflect variability in the bottom current regimes and related alongslope efficiency in terms of transport, deposition and erosion. The detailed seismic analysis of the units making up the Pliocene and Quaternary sequences allows for the first time, to make an in-depth analysis of the contourite features, turbidite systems and mass-movement deposits, and map them through time. These maps are enormously helpful when it comes to understanding the sedimentary architecture of the Spanish and Moroccan continental margins and basins, as well as for decoding the palaeoceanographic processes from a geological perspective. Two main contourite depositional systems are defined: the Intermediate Mediterranean Contourite System (IMCS), formed under the action of the Light Mediterranean Waters (LMW) on the Spanish margin, and the Deep Mediterranean Contourite System (DMCS), formed under the action of the Dense Mediterranean Waters (DMW) mainly on the Moroccan margin and basins. The characterisation of the terraces as contourite features that form under the combination of two water masses, has also led to the definition of the Atlantic Contourite System (ACS). The occurrence of several contourite depositional systems has led to the suggestion of a new term, not heretofore considered in the literature: Multiple Contourite Depositional System (MCDS), which refers to the set of different CDSs that occurs in the same area and evolving under the action of multiple water masses. In addition, twenty turbidite systems have been characterised, revealing that they are responsible for the different sedimentary architecture of the Spanish margin, where they coexist with contourites, as on the Moroccan margin the turbidite systems are less well developed. The mass-movement deposits are mainly related to the reworking of the contourites draping the highs. Mainly contourites but also turbidites, allowed to define from a geological perspective the basic oceanographic processes and to determine their occurrence, relative magnitude and energy, and time of action. This PhD thesis also explains the uneven development of the turbidite systems in the Alboran Sea, which is interpreted to be conditioned by the interaction of alongslope with downslope processes. Several morphological and sedimentary signatures produced by the interaction between both processes have been identified in the Pliocene and Quaternary records, as well as on the present-day seafloor of the Alboran Sea. The interaction scenarios move between two-end-members: from bottom currents dominating gravity flows to gravity flows dominating contour currents. In between these extreme cases, the alternation and mutual influence of both processes can occur. Two different conceptual models of interaction are proposed for the Spanish and Moroccan margins. i) On the Spanish margin, the alongslope and downslope interaction is especially complex and varied, with both regional and local effects on the turbidite systems. This is because here the turbidite systems are influenced at different water depths by Atlantic and Mediterranean water masses and their interfaces, with current flows that change across- and downslope. ii) On the Moroccan margin, the vigorous action of the WMDW primarily inhibits the formation of canyons and associated deposits. The findings of this PhD thesis suggest that the relevance of bottom-water processes in deep sea must be reevaluated. It is concluded that understanding the influence of bottom currents is not only essential for reconstructing present and past water mass circulation, but also for recognising sea floor morphologies and decoding the sedimentary stacking pattern and evolution of deposits, as well as global climate and periods of eustatic variation."--TDX.

Turbidites Reworked by Bottom Currents

Turbidites Reworked by Bottom Currents
Author : Daniel J. Stanley
Publisher : Unknown
Release Date : 1988
Category : Geology, Stratigraphic
Total pages :79
GET BOOK

Annales Societatis Geologorum Poloniae

Annales Societatis Geologorum Poloniae
Author : Anonim
Publisher : Unknown
Release Date : 1996
Category : Geology
Total pages :129
GET BOOK

Messinian Events in the Mediterranean

Messinian Events in the Mediterranean
Author : Cornelis Willem Drooger,J. A. Broekman,Koninklijke Nederlandse Akademie van Wetenschappen
Publisher : Elsevier Science & Technology
Release Date : 1973
Category : Geodynamics
Total pages :272
GET BOOK

Smithsonian Contributions to the Marine Sciences

Smithsonian Contributions to the Marine Sciences
Author : Anonim
Publisher : Unknown
Release Date : 1977
Category : Marine biology
Total pages :129
GET BOOK

Depositional Systems of Active Continental Margin Basins

Depositional Systems of Active Continental Margin Basins
Author : Robert G. Douglas,Ivan P. Colburn,Donn S. Gorsline
Publisher : Unknown
Release Date : 1981
Category : Continental margins
Total pages :165
GET BOOK

Parallel Laminated Deep-sea Muds and Coupled Gravity Flow-hemipelagic Settling in the Mediterranean

Parallel Laminated Deep-sea Muds and Coupled Gravity Flow-hemipelagic Settling in the Mediterranean
Author : Daniel J. Stanley,Robert P. Higgins,Stephen J. Culver,Walter H. Adey
Publisher : Unknown
Release Date : 1982
Category : Algae
Total pages :19
GET BOOK

Subaqueous Gravity Flows and Associated Deposits in the Rader Member, Capitan Reef Complex (Permian), Delaware Mountains, West Texas

Subaqueous Gravity Flows and Associated Deposits in the Rader Member, Capitan Reef Complex (Permian), Delaware Mountains, West Texas
Author : Ellen C. Lawson
Publisher : Unknown
Release Date : 1989
Category :
Total pages :320
GET BOOK

Oceanic Abstracts with Indexes

Oceanic Abstracts with Indexes
Author : Anonim
Publisher : Unknown
Release Date : 1985
Category : Marine biology
Total pages :129
GET BOOK

Shelf Sands and Sandstone Reservoirs

Shelf Sands and Sandstone Reservoirs
Author : Donald J. P. Swift,Roderick W. Tillman,Roger G. Walker
Publisher : SEPM (Society for Sedimentary Geology)
Release Date : 1985
Category : Continental shelf
Total pages :708
GET BOOK

Description of Affected Environmental Resources

Description of Affected Environmental Resources
Author : Anonim
Publisher : Unknown
Release Date : 1980
Category : California, Southern
Total pages :137
GET BOOK