Without compressional forces to support them, mountains gradually collapse under their own weight. The result is crustal _____, with the crust reaching thicknesses of more than ___ miles. Rather than subduct, the upper crustal layers of these thickened zones are peeled from the descending plate and ____ in relatively thin sheets on the adjacent continental block. The Bighorn Basin is a structural low, with the Absaroka Range to the west, the Bighorn Mountains to the … Wyoming More information liesegangpoisoning: Sheep Mountain anticline - Wyoming All kindsa goodies up in there: Belemnites, pentacrinus, gastroliths, “devil’s toenails”… geologist/ paleontologist heaven. Because these newly formed basaltic magmas are less dense than the rocks from which they originated, they will ____ rise. In addition, the upward migration of buried salt deposits can produce salt domes like those surrounding Gulf of ____. The trend of the anticline parallels that … Throughout history, portions of the Great Valley lay below sea level. This doubly-plunging asymmetrical anticline is deeply dissected and exposes strata ranging in age from the Mississippian (Madison Formation) to the Paleocene (Ft. Union Formation). Periodic volcanic activity, the emplacement of igneous plutons at depth, and the accumulation of sediment that is scraped from the subducting plate gradually increase the volume of crustal material ___________ the upper plate. Diagenetic characteristics and alteration associated with fluid migration within the fracture network were examined using strontium and stable isotopes in conjunction with petrography. Some outcrops have a sequence of interbedded weak and strong rock layers that have been moderately deformed by folding. In this setting, it is highly likely that island arcs or small crustal fragments will be carried along until they collide with an active ____ ____. California's Sierra Nevada, Coast Ranges, and Great Valley are excellent examples of tectonic structures that are typically generated along an _____ type subduction zone. Whenever the stresses acting on a rock body exceed its strength, the rock will deform by: when stress is applied unequally in different directions. As Pangaea fragmented, ___ moved rapidly geologically speaking, a few thousand kilometers in a northward direction. Research suggests that prior to their _________to a continental block, some of these fragments may have been ______ similar to the modern-day island of Madagascar, located east of Africa in the Indian Ocean. The field data gathered then form the basis for a paper titled: "Geologic History of the Sheep Mountain Region". This region, which is composed of relatively undeformed layers of sediment and sedimentary rocks, is called a ____ basin. Some features of this site may not work without it. The monocline consists of bent sedimentary beds that were deformed by faulting in the bedrock below. Folding of a basement involved, fault-cored anticline: an example from Sheep Mountain Anticline, Wyoming : Nicolas Bellahsen, Patricia E. Fiore, David D. Pollard : 2005 International Conference on Theory and Application of Fault-Related Folding in Foreland Basins, Beijing, China The zone may be up to several kilometers wide. A few structural basins may have resulted from _____ _____ impacts. Sheep Mountain Anticline is a basement cored, doubly-plunging, asymmetric fold on the east limb of the Bighorn structural basin. If this occurred, the added crustal thickness would account for the lofty landscape of southern ____, which has an average elevation higher than Mount ____, the highest point in the contiguous United States. In addition, mountain belts of similar origin formed during the same period and were once ______ are found in the British Isles, Scandanavia, northwestern Africa, and Greenland. Anticlines in the basin provide subsurface structural traps for oil and natural gas, several of which produce from the Mississippian Madison Formation, a world-class fractured carbonate reservoir. Geologists have determined that one or perhaps more small crustal fragments were positioned on the _____ plate somewhere between _____ and ___. The _____ Mountains provide great scenic beauty near the eastern margin of North America, from Alabama to Newfoundland. Thrust faults, on the other hand, exist at all scales, with some ____ thrust faults having displacements ranging from tens to hundreds of kilometers. The results are compared to previously published … Northwest. The most recent movement is often along a strand only a few meters wide, which may offset features such as stream channels. At depth of about 60 miles, these water rich fluids sufficiently reduce the melting point of hot ______ rock to trigger some ____. Much of the remaining penetration into Asia caused lateral displacement of large blocks of the Asian crust by a mechanism described as _____ ____. Additional materials are derived from an adjacent continent or or ___ ___ and consists of volcanic debris and products of weathering and erosion. An open syncline. Beginning about 30 million years ago, ______ gradually ceased along much of th margin of North America, as the spreading center that produced the _____ plate entered the California trench. of Geological and Environmental Sciences, Stanford University, Stanford, CA We use fracture data and mechanical models to constrain the fold kinematics at Sheep Mountain Anticline, a Laramide fold on the eastern flank of the Bighorn Basin, Wyoming. More model information This model shows the northern end of Sheep Mountain in central Wyoming. The anticline trends NW-SE and verges to the NE, a product of the high angle Laramide basement thrusting that uplifted the Bighorn Mountains. dip-slip faults in which the hanging wall block moves up relative to the footwall block. @article{osti_6084236, title = {Surface and subsurface analysis of Sheep Mountain anticline, Wyoming}, author = {Abercrombie, S}, abstractNote = {The Sheep Mountain area, in the southwest Wind River Basin, is the up plunge closure of the Derby Dome-Winkleman Dome producing trend of an echelon folds which comprise the first line of folding down the northeast flank of the Wind River Mountains. Sheep Mountain Anticline is a basement‐cored, doubly plunging, asymmetric fold (Figures 1 and 3). The basic geologic features that form as a result of the forces generated by the interactions of tectonic plates are called ____ ____ or ____ _____. As a result of their unique structure, these pieces of ______ lithosphere help identify the collision boundary. Today, these folded and thrust-faulted sandstones, limestones, and _____ make up the largely unmetamorphosed rocks of the valley and Ridge Province. Sheep Mountain is in the Gros Ventre Wilderness of Bridger-Teton National Forest. The ___ ____ of the United States provides a modern example of a passive continental margin where sedimentation has produced a thick platform of shallow-water sandstones, limestones, and shales. came into existence 100 million years ago. An outcrop-scale investigation of fracture geometry and geochemical analysis of breccia bodies in the anticline provides insight into the history of fluid migration and structurally-controlled diagenesis within the anticline. STructural domes can also form by the intrusion of magma ____. On June 5, 1976, the Teton Dam in Idaho failed, taking 14 lives and causing nearly 1 billion in property damage. The limb of an anticline is also a limb of the adjacent _____. This thick, cold slab of crustal material has been intact for more than 2 billion years and is mechanically strong as a _____. Geologists use the term ____ to describe the forces that deform rocks. however, the axial plane often leans to one side so that one limb is ____ and _____ than the other. It is 15 miles long and the involved rock formations, which were originally horizontal, have been bent and uplifted over 1000 feet. The Sheep Mountain anticline (Wyoming, USA) is a well-exposed asymmetric, basement-cored anticline that formed during the Laramide orogeny in the early Tertiary. Numerous transform faults cut the oceanic lithosphere and link spreading oceanic ridges. Alpine-type orogenies, named after the ______ that have been studied intensely for more than 200 years, occur where two continental masses collide. At some point, the forces that drive plate motions change, and a subduction zone develops along the margin of the _____. Some large volcanic island arcs, such as _____, owe their size to having been built on fragments of continental crust that have rifted from a large landmass or the joining of multiple island arcs over time. The theory of ______ _____ provides a model for orogenesis with excellent explanatory power and accounts for the origin of virtually all the present mountain belts and most of the ancient ones. The _______ that generated this extensive mountain system lasted a few hundred million years and was one of the stages in assembling the supercontinent of ______. Movements along these faults produced alternating uplifted fault blocks called __, are tilted fault blocks, also contribute to the alternating topographic highs and lows in the Basin and Range Province. Because this new zone of rifting occurred east of the ____ that formed when Africa and North America collided, remnants of Africa remain ___to the the ____ ____ plate. This type of orogeny may also involve the _____ of continental fragments or island arcs that occupied the ocean basin that once separated the two continental blocks. In order to unravel the history of strain during folding, we carried out combined anisotropy of magnetic susceptibility (AMS), anisotropy of P-wave velocity (APWV) and Fry strain analyses. Extensive joint patterns often develop in response to relatively subtle and often barely perceptible regional upwarping and _____ of the crust. The zone where two continents collide are ________ together is called a ______. The Sheep Mountain Anticline is situated between the towns of Lovell and Greybull in the northwest part of Wyoming; its long, narrow, and perfectly straight crest is an easily recognizable sight from many areas around the Big Horn Basin. A cross-section at a right angle to the axis of a plunging anticline looks the same as an anticline. The shortening and thickening of the crust elevated great quantities of crustal material thereby generating the spectacular ______ Mountains. Hydrothermal breccia bodies represent discrete vertical fluid conduits controlled by fracture geometry through which hydrothermal fluids migrated. An open anticline. 090-09: Sheep Mountain, Bighorn Basin, WY. These folds appear to have resulted from the reactivation of ancient, steep-dipping reverse faults located in basement rocks beneath the plateau. An example of an anticline is shown in the map below. This is an excellent view of the succession from the Triassic Gypsum Springs Formation (The white rim around the valley bottom) through the Permian Phosphoria Formation (The heavily fractured white limestone and dolostone of the hinge). Examples of mountainous belts produced by this type of compressional tectonics include the. These displaced crustal blocks include much of southeast Asia, region between India and China, and sections of ____. The Sheep Mountain area, in the southwest Wind River Basin, is the up plunge closure of the Derby Dome-Winkleman Dome producing trend of an echelon folds which comprise the first line of folding down the northeast flank of the Wind River Mountains. Plunging anticline. These major strike-slip faults are called ___ ____. Island arcs result from the steady _____ of oceanic lithosphere, which may last for 200 million years or more. The weakest naturally occurring solid to exhibit ductile flow is __ ___. Among the most common rock structures are fractures called ___. The vast majority of faults are remnants of past deformation and are ____. These strong brittle rocks tend to fail by ____ when subjected to stresses that exceed their strength. Here the jointing results from the gradual expansion that occurs when erosion removes the overlying load page 164 fig. Sheep Mountain anticline is located on the eastern flank of the Bighorn Basin (Figure 1a), north central Wyoming, north of the town of Greybull. A combination of field techniques and analytical methods were used to characterize the relationship between fracture patterns and subsurface paleofluid migration. An anticline is a geologic formation where the strata slope downward on either side of a crest, and this particular mountain is one of the more famous examples of this kind of formation. The subduction zone that facilitated India's northward ______ was near the southern margin of ____. large transform faults accommodate relative displacements of up to several ___ ____. Pollard Dept. Prior to the breakup of _______, India was located between _____ and _______ in the Southern Hemisphere. Sheep Mountain Anticline, located near Greybull along the east flank of the Bighorn Basin is a well known and typical, northwest-southeast trending, Laramide fold. Anticlines in the basin provide subsurface structural traps for oil and natural gas, several of which produce from the Mississippian Madison Formation, a world-class fractured carbonate reservoir. The town of Jackson, Wyoming is 13 miles (21 km) southwest of the peak. Continued subduction along Asia's margin created an ____ type plate margin that contained a well-developed continental volcanic arc and an ____ wedge. Rather, ridges and valleys result because of ____ ___ and ___. Little Sheep Mountain is a doubly-plunging asymmetric anticline in the northeastern Bighorn Basin, Wyoming. The continued closing of this ancient ocean basin resulted in the collision of a microcontinent with _____ ____. During the closing of the intervening ocean basin, a small crustal fragment, which now forms southern ____, reached the trench. Its NW–SE trend (Figure 1) is similar to that of many folds within the Rocky Mountains, although some others formed at acute angles to the regional compression [ Erslev, 1993 ]. When an oceanic plate contains small seamounts, these structures are generally subducted along with the descending ______ slab. Because large basin contain sedimentary beds sloping at low angles, they are usually identified by the age of the rocks composing them. In addition, volcanic island arcs and other crustal fragments drift across the ocean ____ until they reach a subduction zone, where they collide and become welded to another crustal fragment or a larger continental block. Sierra Nevada, Coast Ranges, and Great Valley. Outcrops of the folded and thrust-faulted structures that characterize collisional mountains are found as far inland as central ____ and ____ ____. 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