Lithologic Controls on Knickpoint Formation in Sierra Nevada Bedrock Channels PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Lithologic Controls on Knickpoint Formation in Sierra Nevada Bedrock Channels PDF full book. Access full book title Lithologic Controls on Knickpoint Formation in Sierra Nevada Bedrock Channels by Brittany Danielle Johnson. Download full books in PDF and EPUB format.
Author: Brittany Danielle Johnson Publisher: ISBN: Category : Granite Languages : en Pages : 71
Book Description
In the Sierra Nevada Mountains, the distribution of knickpoints in bedrock channels is often used as evidence to argue that the mountain range has been recently uplifted. The assumption that bedrock channel knickpoints are transient features responding to a recent pulse of uplift contributes to the ongoing debate about the range’s geomorphic and tectonic evolution. Determining how knickpoints form in heterogeneous granitic landscapes remains fundamental in understanding the lithologic, tectonic, and climatic controls on bedrock incision. Defining the controls on knickpoint formation may limit how knickpoints are used to infer the tectonic history of the Sierra Nevada. In this study, tributaries of the North Fork Feather and Merced Rivers are examined because they are underlain by a variety of rock types, thereby providing an opportunity to investigate the relationship between lithologic diversity and knickpoint formation. In these tributaries, bedrock above knickpoints is often finer grained with a higher percentage of quartz than bedrock below the knickpoint. The differences in bedrock grain size and quartz content are found to be statistically significant. This study argues that variations in rock hardness predispose lithologically heterogeneous bedrock channels to express transitions in a channel’s resistance to erosion as knickpoints. Thus, knickpoints in Sierra Nevada bedrock channels may have formed by differential erosion rather than uplift-driven incision, and using Sierra Nevada bedrock channel knickpoints as a tool to interpret tectonic activity is arguably inappropriate.
Author: Brittany Danielle Johnson Publisher: ISBN: Category : Granite Languages : en Pages : 71
Book Description
In the Sierra Nevada Mountains, the distribution of knickpoints in bedrock channels is often used as evidence to argue that the mountain range has been recently uplifted. The assumption that bedrock channel knickpoints are transient features responding to a recent pulse of uplift contributes to the ongoing debate about the range’s geomorphic and tectonic evolution. Determining how knickpoints form in heterogeneous granitic landscapes remains fundamental in understanding the lithologic, tectonic, and climatic controls on bedrock incision. Defining the controls on knickpoint formation may limit how knickpoints are used to infer the tectonic history of the Sierra Nevada. In this study, tributaries of the North Fork Feather and Merced Rivers are examined because they are underlain by a variety of rock types, thereby providing an opportunity to investigate the relationship between lithologic diversity and knickpoint formation. In these tributaries, bedrock above knickpoints is often finer grained with a higher percentage of quartz than bedrock below the knickpoint. The differences in bedrock grain size and quartz content are found to be statistically significant. This study argues that variations in rock hardness predispose lithologically heterogeneous bedrock channels to express transitions in a channel’s resistance to erosion as knickpoints. Thus, knickpoints in Sierra Nevada bedrock channels may have formed by differential erosion rather than uplift-driven incision, and using Sierra Nevada bedrock channel knickpoints as a tool to interpret tectonic activity is arguably inappropriate.
Author: Douglas W. Burbank Publisher: John Wiley & Sons ISBN: 1444345044 Category : Science Languages : en Pages : 494
Book Description
Tectonic geomorphology is the study of the interplay between tectonic and surface processes that shape the landscape in regions of active deformation and at time scales ranging from days to millions of years. Over the past decade, recent advances in the quantification of both rates and the physical basis of tectonic and surface processes have underpinned an explosion of new research in the field of tectonic geomorphology. Modern tectonic geomorphology is an exceptionally integrative field that utilizes techniques and data derived from studies of geomorphology, seismology, geochronology, structure, geodesy, stratigraphy, meteorology and Quaternary science. While integrating new insights and highlighting controversies from the ten years of research since the 1st edition, this 2nd edition of Tectonic Geomorphology reviews the fundamentals of the subject, including the nature of faulting and folding, the creation and use of geomorphic markers for tracing deformation, chronological techniques that are used to date events and quantify rates, geodetic techniques for defining recent deformation, and paleoseismologic approaches to calibrate past deformation. Overall, this book focuses on the current understanding of the dynamic interplay between surface processes and active tectonics. As it ranges from the timescales of individual earthquakes to the growth and decay of mountain belts, this book provides a timely synthesis of modern research for upper-level undergraduate and graduate earth science students and for practicing geologists. Additional resources for this book can be found at: www.wiley.com/go/burbank/geomorphology.
Author: Keith J. Tinkler Publisher: American Geophysical Union ISBN: 0875900909 Category : Science Languages : en Pages : 325
Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 107. Bedrock river channels are sites of primary erosion in the landscape, fixing the baselevel for all points upstream. This volume provides for the first time an integrated view of the characteristics and operation of this important, though hitherto neglected, class of channels. Examples are provided from several continents and cover a wide range of spatial scales from the large river basins (such as the Colorado River in the United States and the Indus River in Pakistan) down to reach scales and individual sites. Likewise the geologic timescales considered range from erosion and transportation during individual flows to accumulated effects over periods of tens of millions of years.
Author: Richard John Huggett Publisher: Routledge ISBN: 1135281130 Category : Science Languages : en Pages : 909
Book Description
This extensively revised, restructured, and updated edition continues to present an engaging and comprehensive introduction to the subject, exploring the world’s landforms from a broad systems perspective. It covers the basics of Earth surface forms and processes, while reflecting on the latest developments in the field. Fundamentals of Geomorphology begins with a consideration of the nature of geomorphology, process and form, history, and geomorphic systems, and moves on to discuss: structure: structural landforms associated with plate tectonics and those associated with volcanoes, impact craters, and folds, faults, and joints process and form: landforms resulting from, or influenced by, the exogenic agencies of weathering, running water, flowing ice and meltwater, ground ice and frost, the wind, and the sea; landforms developed on limestone; and landscape evolution, a discussion of ancient landforms, including palaeosurfaces, stagnant landscape features, and evolutionary aspects of landscape change. This third edition has been fully updated to include a clearer initial explanation of the nature of geomorphology, of land surface process and form, and of land-surface change over different timescales. The text has been restructured to incorporate information on geomorphic materials and processes at more suitable points in the book. Finally, historical geomorphology has been integrated throughout the text to reflect the importance of history in all aspects of geomorphology. Fundamentals of Geomorphology provides a stimulating and innovative perspective on the key topics and debates within the field of geomorphology. Written in an accessible and lively manner, it includes guides to further reading, chapter summaries, and an extensive glossary of key terms. The book is also illustrated throughout with over 200 informative diagrams and attractive photographs, all in colour.
Author: A. D. Abrahams Publisher: Springer Science & Business Media ISBN: 9401582548 Category : Science Languages : en Pages : 1021
Book Description
Over the last twenty years there has been a major expansion of knowledge in the field of landforms and landforming processes of deserts. This advanced-level book provides a benchmark for the current state of science, and is written by an international team of authors who are acknowledged experts in their fields.
Author: Steven J. Whitmeyer Publisher: Geological Society of America ISBN: 0813724929 Category : Science Languages : en Pages : 492
Book Description
GSA Special Paper 492 consists of 35 papers that collectively synthesize the development and current uses of Google Earth and associated visualization media in geoscience education and research. Chapters focus on Google Earth and related tools, such as SketchUp, Google Fusion Tables, GigaPan, and LiDAR. Many of these papers include digital media that illustrate and highlight important themes of the texts. This volume is intended to document the state of the art for geoscience applications of geobrowsers, such as Google Earth, along with providing provocative examples of where this technology is headed in the future.
Author: Brittany Danielle Johnson
Author: Brittany Danielle Johnson
Author: Geological Survey (U.S.)
Author: Douglas W. Burbank
Author: Keith J. Tinkler
Author: Richard John Huggett
Author: Bill Bonnichsen
Author: Stuart J. Jones
Author: Edward A. Keller
Author: A. D. Abrahams
Author: Steven J. Whitmeyer