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The origin of metamorphic core complexes and detachment faults
The origin of metamorphic core complexes and detachment faults

... (domino-style) to allow extension to proceed. At the deepest levels, the crust is subject to ductile stretching, approximating bulk pure shear. In the transition zone, ductilely stretching rocks are cut periodically by faults when large earthquakes take place. When such a catastrophic event occurs, ...
Synthesis of Existing Structural Data for the Auckland Volcanic Field
Synthesis of Existing Structural Data for the Auckland Volcanic Field

... fields. Many geophysical studies have been conducted in the area, enabling the identification of many large faults, which probably have equivalents within the AVF. ...
Field Guide to the Punchbowl Fault Zone at Devil`s Punchbowl Los
Field Guide to the Punchbowl Fault Zone at Devil`s Punchbowl Los

... sandstone as a function of distance from the Punchbowl fault. Linear density determined from the total number of fracture intercepts with two perpendicular line segments along four different traverses. Fracture density decreases with distance from the fault except locally near large subsidiary fault ...
secondary planar structural elements
secondary planar structural elements

... In high-grade rocks, differentiated layering is customarily described as gneissic layering, also commonly defined by alternating mafic (dark-coloured) and felsic (light-coloured) layers. The resulting lithological banding may be more or less modified bedding, and thus reflects initial sedimentary co ...
Mesozoic tectonics of the Maria fold and thrust belt and McCoy basin
Mesozoic tectonics of the Maria fold and thrust belt and McCoy basin

... MFTB and assessing synorogenic response in the McCoy Basin using established and new methods of structural geology and geochronology will resolve these questions and illuminate fundamental geologic processes related to orogenesis. This dissertation is divided into three chapters, with the goal of as ...
Tectonic Setting and Regional Geology of the KSZ
Tectonic Setting and Regional Geology of the KSZ

... low-grade metasediments which intercalate with sills of meta-basalt and microdiorite, ophiolitic nappes, molasse-type sediments and post-tectonic granitoids. Mineral assemblages from the metasediments in the southern sector of the shear zone indicate metamorphic conditions of c. 700° C and 20 km cru ...
Tijeras-Canoncito fault system - New Mexico Geological Society
Tijeras-Canoncito fault system - New Mexico Geological Society

... to the northwest and offset increases noticeably along strike, the area of overlap is structurally high. This produces an anti cline (figs. 1, 3) which extends west for at least 5 km to a small Tertiary (Oligocene?) igneous body, probably a lacco lithic tongue from the Ortiz intrusive center. The an ...
Structural Analysis of Ernst Tinaja Canyon Focusing on Strike
Structural Analysis of Ernst Tinaja Canyon Focusing on Strike

... Bend of the Rio Grande” and a more recent publication by the USGS (2011), include geologic maps of Big Bend, but the scale of the maps are less detailed than what this study has produced. Greater detail allows for accurate mapping of a study area and ability to identify smaller structures not identi ...
Crustal thickening in Gansu-Qinghai, lithospheric mantle subduction
Crustal thickening in Gansu-Qinghai, lithospheric mantle subduction

... adjacent ranges, a result of tectonically forced internal drainage, have thus been essential relief-smoothing factors, yielding the outstandingly flat topography that makes Tibet a plateau. Using Late-Mesozoic and Neogene horizons as markers, the retrodeformation of sections across the West Qilian R ...
granites of the lachlan fold belt
granites of the lachlan fold belt

... melt lies at the felsic end of these trends, or its extrapolation, while the composition of the original source rock is located near the mafic end of the trends. These variations could be accounted for by magma mixing or mingling, but such a process cannot account for the correlation in abundances a ...
bureau of geology - Department of Geosciences
bureau of geology - Department of Geosciences

... This thesis has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permissio ...
Mechanisms for folding of high-grade rocks in extensional tectonic
Mechanisms for folding of high-grade rocks in extensional tectonic

... extensional tectonic settings. Several mechanisms for folding during crustal extension produce structures that could easily be misinterpreted as implying regional contraction and hence lead to errors in their tectonic interpretation. It is shown that isoclinal recumbent folds refolded by open, uprig ...
Metamorphic Rocks and Cleavage Development Topics Geothermal
Metamorphic Rocks and Cleavage Development Topics Geothermal

... Two kinds of lineation Intersection Lineation S0 = bedding ...
The Tectonostratigraphy and Structural Evolution of the Sitas Area
The Tectonostratigraphy and Structural Evolution of the Sitas Area

... Within the Sitas area, the Middle K61 i Nappe Complex (MKNC) is composed of eleven informal lithotectonic units. Foss ils have not been found in any of these units ; thus, their age is unknown but is assumed to be early Paleozo ic. Primary structures are generally too poorly preserved to determine f ...
Mid-crustal_magmatic.. - Department of Earth Sciences
Mid-crustal_magmatic.. - Department of Earth Sciences

... AbstractÐDiking, diapirism, ascent along faults, and ascent during heterogeneous ductile ¯ow have all been championed as the most important means of magma ascent in the crust. We suggest that these mechanisms are end-members in a complex spectrum of ascent processes. In an attempt to evaluate which ...
Field Trip Guide
Field Trip Guide

... Figure 5. Simplified diagram showing the regional structural trends from west to east. ...
Geochronology and thermochronology of Cretaceous
Geochronology and thermochronology of Cretaceous

... summarize the results of these studies, which provide a geologic and tectonic context for the geochronologic and thermochronologic data presented in this paper. ...
The Armenian earthquake of 1988 December 7: faulting and folding
The Armenian earthquake of 1988 December 7: faulting and folding

... amplitude of 160cm is observed further away towards the northwest, at about 700 m from the road. The corresponding horizontal displacement at the same site is 40cm and the fault runs along the geological contact between Palaeogene volcanic rocks to the north and Cretaceous limestones to the south (F ...
Geological transport directions in Peninsular Malaysia
Geological transport directions in Peninsular Malaysia

... Multiple Deformations. The tectonic history ofPeninsular Malaysia already indicates that multiple deformations can be expected. Many publications, however, have only stated as ev idence "differences in structural complexity, or in metamorphic grade, or strong fo lding, or microfolding and crenulatio ...
Faults - Dr.A.Shah
Faults - Dr.A.Shah

... talked about yet profoundly significant earthquake known as the Hebgen Lake, or Montana-Yellowstone Earthquake. ...
Introduction to Faults
Introduction to Faults

... are rarer than shorter ones. are where the block movement makes a surface. shear of the opposite sense as the distinct change in topography There are  Blind fault—A fault that main fault. This creates rotation also certain structures thatgreater can imply N = Number of faults with length than L doe ...
SXR339 Ancient Mountains ISBN0749258470
SXR339 Ancient Mountains ISBN0749258470

... 100 km west of the proposed suture (Figure 5.2) would be consistent with significant tectonic transport from east to west. Radiometric dating of granite intruded during crystallization of the complex gives an age of c. 492 Ma (Tremadoc) and provides a date for formation of the oceanic crust at a mid ...
Earth,Tests,Ch10
Earth,Tests,Ch10

... side of the fault to determine relative movement. How else might you determine or even infer whether the hanging wall has moved up or down relative to the footwall? (Hint: Think of fossils, tectonic setting, etc.) Diff: 2 ...
I. Normal Faults A. Characteristics 1. Defined a. Inclined dip
I. Normal Faults A. Characteristics 1. Defined a. Inclined dip

... Half-grabens: normal faulting on one side of block, with net downward rotation ...
Structural Geology (Geol 305) Semester (071)
Structural Geology (Geol 305) Semester (071)

... formation of new layering by recrystallization or pressure solution. It is the production of new minerals with new orientation. ...
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3D fold evolution

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