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Book Fault Zone Architecture of the San Jacinto Fault Zone in Horse Canyon Southern California

Download or read book Fault Zone Architecture of the San Jacinto Fault Zone in Horse Canyon Southern California written by and published by . This book was released on 2010 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stream cuts in Horse Canyon southwest of Anza, California have exposed the fault core, adjacent damage zone, and wall rocks of the San Jacinto fault at an approximate depth of 0.4 km. Here the juxtaposition of tonalitic plutons provides a unique opportunity to assess the formation of fault zone rocks with similar host-rock lithologies. We present results on the physical properties, chemistry and mineralogy of distinct zones identified within the fault zone. Samples from these zones were analyzed using bulk and grain density measurements, geochemical data, clay mineralogy, and textural and modal mineralogy. Progressive mechanical deformation is characterized by initial mode I cracking in quartz and plagioclase and subsequent shearing of fractured rock. These processes produce anastomosing seams of microbreccia and gouge that increase in frequency, thickness, and degree of grain communition towards a strongly indurated cataclasite fault core. Damage progression towards the fault core is accompanied by decreased bulk and grain density and increased porosity and dilational volumetric strain. A-CN-K plots indicate that fault zone rocks are altered along a trend from unweathered tonalitic wall rocks towards an end member that includes illite-mica. Such a trend is different from that expected from normal surface weathering. Chemical alteration along this trend is reflected in elemental mass changes that are most pronounced in the fault core where dissolution of plagioclase has resulted in a core that is highly enriched in quartz. Moreover, the illite/smectite to illite conversion is preserved in the cataclasite core, suggesting elevated temperatures that may have approached ~150°C. The above relationships are consistent with higher water /rock ratios within the fault core than in the surrounding damage zones of gouge and microbreccia. These results, in conjunction with published data on the permeability behavior of cataclasite during deformation events, indicate that hot pore fluids likely circulate upward via a narrow conduit within the San Jacinto fault zone during and after dynamic shearing episodes. Given the ~0.4 km maximum depth of rocks studied in this investigation, such fluids must have reached very shallow levels. Though difficult to constrain, the site studied during this investigation may represent the top of a series of narrow hydrothermal circulation cells that dissipate heat generated from rupture events at deeper levels (> 4 km).

Book The San Andreas Fault System in the Vicinity of the Central Transverse Ranges Province Southern California

Download or read book The San Andreas Fault System in the Vicinity of the Central Transverse Ranges Province Southern California written by Jonathan C. Matti and published by . This book was released on 1992 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The San Andreas Fault System California

Download or read book The San Andreas Fault System California written by and published by . This book was released on 1990 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the history, geology, geomorphology, geophysics, and seismology of the most well known plate tectonic boundary in the world.

Book Quaternary Geologic Evolution of the Northern San Jacinto Fault Zone

Download or read book Quaternary Geologic Evolution of the Northern San Jacinto Fault Zone written by Katherine Jean Kendrick and published by . This book was released on 1999 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fault Zone Dynamic Processes

Download or read book Fault Zone Dynamic Processes written by Marion Y. Thomas and published by John Wiley & Sons. This book was released on 2017-07-12 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquakes are some of the most dynamic features of the Earth. This multidisciplinary volume presents an overview of earthquake processes and properties including the physics of dynamic faulting, fault fabric and mechanics, physical and chemical properties of fault zones, dynamic rupture processes, and numerical modeling of fault zones during seismic rupture. This volume examines questions such as: • What are the dynamic processes recorded in fault gouge? • What can we learn about rupture dynamics from laboratory experiments? • How do on-fault and off-fault properties affect seismic ruptures? • How do fault zones evolve over time? Fault Zone Dynamic Processes: Evolution of Fault Properties During Seismic Rupture is a valuable resource for scientists, researchers and students from across the geosciences interested in the earthquakes processes.

Book Proceedings

Download or read book Proceedings written by Robert Louis Kovach and published by . This book was released on 1973 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Shallow Seismic Reflection Profiling Across the San Jacinto Fault Zone in the San Jacinto Valley California

Download or read book Shallow Seismic Reflection Profiling Across the San Jacinto Fault Zone in the San Jacinto Valley California written by Darin Michael Pendergraft and published by . This book was released on 1993 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Heat Flow Through the San Jacinto Fault Zone Southern California

Download or read book Heat Flow Through the San Jacinto Fault Zone Southern California written by Tien-Chang Lee and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Incipient Pulverization at Shallow Burial Depths Along the San Jacinto Fault Southern California

Download or read book Incipient Pulverization at Shallow Burial Depths Along the San Jacinto Fault Southern California written by and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: We studied the fault zone architecture and searched for evidence of shallow damage production in sandstones along the Clark strand of the San Jacinto Fault in Rock House Canyon, western Salton Trough, California. Here, the fault juxtaposes tonalite on the northeast against the Bautista sandstone on the southwest. The fault core and associated damage zone is visible at two separate fault exposures that have experienced total burial depths of ~70 m and ~120m, respectively. Physical damage in the lower exposure resembles incipient pulverization in the sandstone “wallrock”, and exhibits a preferred crack orientation that is perpendicular to the fault, which in turn suggests the occurrence of significant in situ brittle deformation at this very shallow burial depth. The upper exposure at 70 m burial depth displays very little evidence of fragmentation of sand grains outside of the fault core; together, these observations suggest that the onset of pulverization occurs between about 70 and 120 m depth. Elemental and bulk mass redistributions, along with changes in observed clay mineralogy, indicate the occurrence of chemical changes resulting from fluid flow at both locations. Based on our observations and analysis of the data, we conclude that the observed physical damage and fluid related alterations are likely the result of stresses produced by dynamic rupture.

Book Final Report on Investigation of Structures of the San Jacinto Fault Near Anza California Using Fault zone Trapped Waves

Download or read book Final Report on Investigation of Structures of the San Jacinto Fault Near Anza California Using Fault zone Trapped Waves written by Yung-kang Li and published by . This book was released on 1995* with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Rose Canyon Fault Zone Southern California

Download or read book The Rose Canyon Fault Zone Southern California written by Jerome A Treiman and published by . This book was released on 1993 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: