Bare Bedrock Erosion Rates in the Central Appalachians, Virginia
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Sedimentological Constraints on the Initial Uplift of the West Bogda Mountains in Mid-Permian
www.nature.com/scientificreports OPEN Sedimentological constraints on the initial uplift of the West Bogda Mountains in Mid-Permian Received: 14 August 2017 Jian Wang1,2, Ying-chang Cao1,2, Xin-tong Wang1, Ke-yu Liu1,3, Zhu-kun Wang1 & Qi-song Xu1 Accepted: 9 January 2018 The Late Paleozoic is considered to be an important stage in the evolution of the Central Asian Orogenic Published: xx xx xxxx Belt (CAOB). The Bogda Mountains, a northeastern branch of the Tianshan Mountains, record the complete Paleozoic history of the Tianshan orogenic belt. The tectonic and sedimentary evolution of the west Bogda area and the timing of initial uplift of the West Bogda Mountains were investigated based on detailed sedimentological study of outcrops, including lithology, sedimentary structures, rock and isotopic compositions and paleocurrent directions. At the end of the Early Permian, the West Bogda Trough was closed and an island arc was formed. The sedimentary and subsidence center of the Middle Permian inherited that of the Early Permian. The west Bogda area became an inherited catchment area, and developed a widespread shallow, deep and then shallow lacustrine succession during the Mid- Permian. At the end of the Mid-Permian, strong intracontinental collision caused the initial uplift of the West Bogda Mountains. Sedimentological evidence further confrmed that the West Bogda Mountains was a rift basin in the Carboniferous-Early Permian, and subsequently entered the Late Paleozoic large- scale intracontinental orogeny in the region. The Central Asia Orogenic Belt (CAOB) is the largest accretionary orogen on Earth, which was formed by the amalgamation of multiple micro-continents, island arcs and accretionary wedges1–5. -
A Geomorphic Classification System
A Geomorphic Classification System U.S.D.A. Forest Service Geomorphology Working Group Haskins, Donald M.1, Correll, Cynthia S.2, Foster, Richard A.3, Chatoian, John M.4, Fincher, James M.5, Strenger, Steven 6, Keys, James E. Jr.7, Maxwell, James R.8 and King, Thomas 9 February 1998 Version 1.4 1 Forest Geologist, Shasta-Trinity National Forests, Pacific Southwest Region, Redding, CA; 2 Soil Scientist, Range Staff, Washington Office, Prineville, OR; 3 Area Soil Scientist, Chatham Area, Tongass National Forest, Alaska Region, Sitka, AK; 4 Regional Geologist, Pacific Southwest Region, San Francisco, CA; 5 Integrated Resource Inventory Program Manager, Alaska Region, Juneau, AK; 6 Supervisory Soil Scientist, Southwest Region, Albuquerque, NM; 7 Interagency Liaison for Washington Office ECOMAP Group, Southern Region, Atlanta, GA; 8 Water Program Leader, Rocky Mountain Region, Golden, CO; and 9 Geology Program Manager, Washington Office, Washington, DC. A Geomorphic Classification System 1 Table of Contents Abstract .......................................................................................................................................... 5 I. INTRODUCTION................................................................................................................. 6 History of Classification Efforts in the Forest Service ............................................................... 6 History of Development .............................................................................................................. 7 Goals -
Geologic Systems
© Jones & Bartlett Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OR DISTRIBUTION NOT FOR SALE OR DISTRIBUTION © Jones & Bartlett Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OR DISTRIBUTION NOT FOR SALE OR DISTRIBUTION © Jones & Bartlett Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OR DISTRIBUTION NOT FOR SALE OR DISTRIBUTION © Jones & Bartlett Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OR DISTRIBUTION NOT FOR SALE OR DISTRIBUTION © Jones & Bartlett Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OR DISTRIBUTION NOT FOR SALE OR DISTRIBUTION © Jones & Bartlett Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OR DISTRIBUTION NOT FOR SALE OR DISTRIBUTION Geologic Systems © Jones & Bartlett2 Learning, LLC © Jones & Bartlett Learning, LLC NOT FOR SALE OREarth DISTRIBUTION is a dynamic planet because the materialsNOT of its various FOR SALElayers are OR in motion. DISTRIBUTION The effects of both the hydrologic and the tectonic systems are dramatically expressed in this space photograph of eastern North America. The most obvious motion is that of the surface fluids: air and water. The complex cycle by which water moves from the oceans into the atmosphere, to the land, and back to the oceans again is the fundamental movement within the hydrologic system. The energy source that drives© Jones this system & Bartlett is the Sun. Learning, Its energy evaporates LLC water from the oceans© andJones causes & Bartlett Learning, LLC the atmosphereNOT to circulate,FOR SALE as shown OR above DISTRIBUTION by the swirling clouds of hurricane Dennis.NOT Water FOR SALE OR DISTRIBUTION vapor is carried by the circulating atmosphere and eventually condenses to fall as rain or snow, which gravity pulls back to Earth’s surface. -
Geology of the Central and Northern Parts of the Western Cascade Range in Oregon
Geology of the Central and Northern Parts of the Western Cascade Range in Oregon GEOLOGICAL SURVEY PROFESSIONAL PAPER 449 Prepared in cooperation with the State of Oregon, Departtnent of Geology and Mineral Industries Geology of the Central and Northern Parts of the Western Cascade Range in Oregon By DALLAS L. PECK, ALLAN B. GRIGGS, HERBERT G: SCHLICKER, FRANCIS G. WELLS, and HOLLIS M. DOLE ·~ GEOLOGICAL SURVEY PROFESSIONAL PAPER 449 Prepared in cooperation with the State of Oregon, Department of Geology and Mineral Industries ,... UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1964 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director . -~ The U.S. Geological Survey Library catalog card for this publication appears after page 56. For sale by the Superintendent of Documents,. U.S. Government Printing Office · · ·. Washington, D.C. 20402 CONTENTS Page Page Stratigraphy-Continued 1 Abstract------------------------------------------- Sardine Formation-Continued Introduction ______ --------------------------------- 2 Lithology and petrography-Continued Scope of investigation ______ - ___ - __ -------------- 2 Location, accessibility, and culture __ -------------- 2 Pyroclastic rocks __________ -- __ ---------'-- 33 Physical features ______ --_---_-_- ___ -----_------- 3 Age and correlation ____ - _--- __ -------------- 34 Climate and vegetation ___ --- ___ - ___ -----_------- 4 Troutdale Formation _____ ------------------------ 35 Fieldwork and reliability of the geologic -
Uplift of Earth's Crust
Standards—7.3.4: Explain how heat flow and movement of material within Earth causes earthquakes and vol- canic eruptions and creates mountains and ocean basins. 7.3.7: Give examples of some changes in Earth’s surface that are abrupt, such as earthquakes and volcanic eruptions, and some changes that happen very slowly, such as uplift and wearing down of mountains and the action of glaciers. Also covers: 7.2.7 (Detailed standards begin on page IN8.) Uplift of Earth’s Crust Building Mountains One popular vacation that people enjoy is a trip to the mountains. Mountains tower over the surrounding land, often providing spectacular views from their summits or from sur- I Describe how Earth’s mountains rounding areas. The highest mountain peak in the world is form and erode. Mount Everest in the Himalaya in Tibet. Its elevation is more I Compare types of mountains. than 8,800 m above sea level. In the United States, the highest I Identify the forces that shape mountains reach an elevation of more than 6,000 m. There are Earth’s mountains. four main types of mountains—fault-block, folded, upwarped, and volcanic. Each type forms in a different way and can pro- The forces inside Earth that cause duce mountains that vary greatly in size. Earth’s plates to move around also are responsible for forming Earth’s Age of a Mountain As you can see in Figure 11, mountains mountains. can be rugged with high, snowcapped peaks, or they can be rounded and forested with gentle valleys and babbling streams. -
Present-Day Surface Deformation of the Alpine Region Inferred from Geodetic Techniques
Discussions Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2018-19 Earth System Manuscript under review for journal Earth Syst. Sci. Data Science Discussion started: 6 March 2018 c Author(s) 2018. CC BY 4.0 License. Open Access Open Data Present-day surface deformation of the Alpine Region inferred from geodetic techniques Laura Sánchez1, Christof Völksen2, Alexandr Sokolov1,2, Herbert Arenz1, Florian Seitz1 5 1Technische Universität München, Deutsches Geodätisches Forschungsinstitut (DGFI-TUM), Arcisstr. 21, 80333 München, Germany 2Bayerische Akademie der Wissenschaften, Erdmessung und Glaziologie, Alfons-Goppel-Str. 11, 80539 München, Germany Correspondence to: Laura Sánchez ([email protected]) 10 Abstract. We provide a present-day surface-kinematics model for the Alpine region and surroundings based on a high-level data analysis of about 300 geodetic stations continuously operating over more than 12 years. This model includes a deformation model, a continuous surface-kinematic (velocity) field, and a strain field consistently assessed for the entire Alpine mountain belt. Special care is given to the use of the newest GNSS processing standards to determine high-precise 3D station coordinates. The coordinate solution refers to the reference frame 15 IGb08, epoch 2010.0. The mean precision of the station positions at the reference epoch is ±1.1 mm in N and E and ±2.3 mm in height. The mean precision of the station velocities is ±0.2 mm/a in N and E and ±0.4 mm/a in the height. The deformation model is derived from the pointwise station velocities using a geodetic least-squares collocation approach with empirically determined covariance functions. -
Alphabetical Glossary of Geomorphology
International Association of Geomorphologists Association Internationale des Géomorphologues ALPHABETICAL GLOSSARY OF GEOMORPHOLOGY Version 1.0 Prepared for the IAG by Andrew Goudie, July 2014 Suggestions for corrections and additions should be sent to [email protected] Abime A vertical shaft in karstic (limestone) areas Ablation The wasting and removal of material from a rock surface by weathering and erosion, or more specifically from a glacier surface by melting, erosion or calving Ablation till Glacial debris deposited when a glacier melts away Abrasion The mechanical wearing down, scraping, or grinding away of a rock surface by friction, ensuing from collision between particles during their transport in wind, ice, running water, waves or gravity. It is sometimes termed corrosion Abrasion notch An elongated cliff-base hollow (typically 1-2 m high and up to 3m recessed) cut out by abrasion, usually where breaking waves are armed with rock fragments Abrasion platform A smooth, seaward-sloping surface formed by abrasion, extending across a rocky shore and often continuing below low tide level as a broad, very gently sloping surface (plain of marine erosion) formed by long-continued abrasion Abrasion ramp A smooth, seaward-sloping segment formed by abrasion on a rocky shore, usually a few meters wide, close to the cliff base Abyss Either a deep part of the ocean or a ravine or deep gorge Abyssal hill A small hill that rises from the floor of an abyssal plain. They are the most abundant geomorphic structures on the planet Earth, covering more than 30% of the ocean floors Abyssal plain An underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. -
Chapter 10 Plate Tectonics
Chapter 10 Plate Tectonics Learning Objectives After carefully reading this chapter, completing the exercises within it, and answering the questions at the end, you should be able to: • Discuss some of the early evidence for continental drift and Alfred Wegener’s role in promoting this theory. • Explain some of the other models that were used early in the 20th century to understand global geological features. • Describe the numerous geological advances made in the middle part of the 20th century that provided the basis for understanding the mechanisms of plate tectonics and the evidence that plates have moved and lithosphere is created and destroyed. • List the seven major plates, their extents, and their general directions of motion, and identify the types of boundaries between them. • Describe the geological processes that take place at divergent and convergent plate boundaries, and explain the existence of transform faults. • Explain how super-continents form and how they break apart. • Describe the mechanisms for plate movement. As we discovered in Chapter 1, plate tectonics is the model or theory that we use to understand how our planet works. More specifically it is a model that explains the origins of continents and oceans, folded rocks and mountain ranges, igneous and metamorphic rocks, earthquakes (Figure 10.0.1) and volcanoes, and continental drift. Plate tectonics was first proposed just over 100 years ago, but did not become an accepted part of geology until about 50 years ago. It took 50 years for this theory to be accepted for a few reasons. First, it was a true revolution in thinking about Earth, and that was difficult for many established geologists to accept. -
Landforms in the United States and Conclu Sions About How They Came Into Being Are Among the Basic Studies Conducted by the U.S
.-.- .., ';i% t ^ , 3VI l : CO *- Landforms of the United States The United States contains a great variety of landforms which offer dramatic contrasts to a cross-country traveler. Mountains and desert areas, tropical jungles and areas of permanently frozen subsoil, and deep canyons and broad plains are examples of the Nation's varied surface. The present- day landforms the features that make up the face of the Earth are products of the slow sculpturing actions of streams and geologic processes that have been at work throughout the ages since the Earth's beginning. Landforms may be classified as deposi- tional or erosional. Depositional landforms have the character and shape of the deposits of which they are made. They include beaches, stream terraces, and alluvial fans at the foot of mountains. Erosional landforms are ones that have been created by agents of erosion such as streams, rain, and ice. The most widespread erosional landforms are those made by running water acting over very long periods of time. Rain, accumulating as a sheet of water on the ground, does not travel far before it gathers in channels. These channels, like branches of a tree, extend from a myriad of branchlets to larger and larger branches and finally to main trunk rivers. Stream channels are abundant in a humid climate, and commonly one cannot travel in a straight line for more than a half mile with out encountering one. Stream channels also occur in deserts, but they are farther apart and water runs in them only intermittently. This aerial view of stream-eroded landscape is in the Ozark Plateau, Missouri. -
Geology Teacher Guide
National Park Service Rocky Mountain U.S. Department of Interior Rocky Mountain National Park Geology Teacher Guide Table of Contents Rocky Mountain National Park.................................................................................................1 Teacher Guides..............................................................................................................................2 Rocky Mountain National Park Education Program Goals...................................................2 Geology Background Information Introduction.......................................................................................................................4 Setting.................................................................................................................................5 Tectonics of Rocky Mountain National Park..............................................................10 Glaciers of Rocky Mountain National Park................................................................16 Erosion History of Rocky Mountain National Park...................................................20 Foothills outside Rocky Mountain National Park......................................................21 Climate and Ecology of Rocky Mountain National Park..........................................22 Geology Resources Classroom Book List.......................................................................................................26 Glossary.............................................................................................................................28 -
Kennesaw Mountain U.S
National Park Service Kennesaw Mountain U.S. Department of the Interior Kennesaw Mountain National Battlefield Park Geologic Origins of Kennesaw Mountain Kennesaw Mountain National Battlefield Park is nestled in the Piedmont geologic province of north-central Georgia. This geologic province was formed between approximately one billion to 300 million years ago through a series of mountain building events or orogenies. In geologic time this period is know as the late Precambrian to the early Paleozoic. Birth of the Piedmont The surface relief or topography of the Piedmont palachians. At that time North America and Africa is characterized by relatively low, rolling hills with collided to make the Pangaean supercontinent. heights above sea level between 200 feet (50 meters) and 800 feet to 1,000 feet (250 meters Here in the southeast at the heart of the collision, to 300 meters). Its geology is complex with intense transformation and heating deeper in the numerous rock formations of different materials Earth generated the rocks of the Piedmont. These and ages intermingled with one another. rocks were deeply buried in the collision, but erosion of the overlying mountain belts has Essentially, the Piedmont is the remnant of sev subsequently exposed those rocks today. What eral ancient mountain chains that have since been remains are various types of metamorphic rocks eroded away. These mountains, at the time of their such as schists, amphibolites, gneisses and formation, looked like what the western Rocky migmatites, and igneous rocks such as granite. Mountains do today. Isolated granitic domes of cooled magma also rise above the Piedmont The Appalachian mountain-building event, landscape to create prominent features like Stone known as the Alleghanian Orogeny, occurred dur Georgia Geologic Province Map Courtesy of USGS Mountain. -
Geologic History
Geologic History Mountain Building Part I: ○○○○○○○○○○○○○○○ the Grenville Mountains The oldest rocks found on Earth date back 3.9 billion years. An- North America was not always the shape we see today. The continent cient metamorphic gneiss from was formed over billions of years, and geologic processes continue to shape it this time is found in South Africa, Antarctica, Greenland and North- today. The Earth is estimated to be 4.5 billion years old. The oldest rocks west Canada. Sedimentary rocks of the same age have been found in that we know of are nearly 4 billion years old. Although these ancient rocks ○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○ western Australia. are found on almost every continent, none are found at the Earth’s surface in the Northeast. In North America, these most ancient rocks are found exposed How do plates move? at the surface in many parts of Canada. These rocks make up the Precambrian The lithosphere is the outermost layer of the Earth, a rigid crust and shield, a stable continental landmass that is the core of North America. The upper mantle broken up into dynamic plates of the Earth are constantly in motion, made of rigid continental many plates. The heat and pres- sure created by the overlying litho- and oceanic crust overlying the churning, plastically flowing asthenosphere sphere, make the solid rock of the asthenosphere bend and move (Figure 1.2). Plates are pulling apart, colliding into one another, or sliding past like metal when heated. The flow- each other with great force, creating strings of volcanic islands, new ocean ing rock in the asthenosphere floor, earthquakes, and mountains, melting rock and injecting magma into the moves with circular convection currents, rising when hot and fall- overlying crust.