Download or read book Tectonic Reconstruction of the Southern San Andreas Fault System Using Segments of the Chocolate Mountains Anticlinorium in the San Gabriel Mountains Southern California U S A written by Kevin Thomas Coffey and published by . This book was released on 2019 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: The San Gabriel Mountains of southern California contain anticlinoria of schist thought to correlate with one another, and with the Chocolate Mountains anticlinorium to the east. These correlations provide cumulative-slip estimates for the Punchbowl and southern San Andreas faults, respectively; however, the validity of these correlations, as well as the original orientations of these anticlinoria, is debated. This dissertation presents four related studies, each addressing a different aspect of this problem. Chapter 1 presents sedimentologic and structural data verifying that the two anticlinoria of the San Gabriel Mountains were continuous prior to 40-50 km of dextral slip on the Punchbowl fault, and casting doubt on the 80-110 km of dextral slip on the San Francisquito-Fenner-Clemens Well fault suggested by some prior studies. Chapter 2 presents structural data from the schist of the larger anticlinorium of the San Gabriel Mountains, which supports its correlation with the Chocolate Mountains anticlinorium, and thus estimates of approximately 240 km of dextral slip on the southern San Andreas fault. New data are combined with previously published structural and paleomagnetic data, which have been interpreted as implying different architectures for the anticlinorium, suggesting a model reconciling the datasets, and implying an originally linear, approximately northeast/southwest trend of the anticlinorium. Chapter 3 proposes a strain-partitioning model for the anomalously oriented Mojave segment of the southern San Andreas fault, in which slip south of this segment is partitioned within this segment into a strike-slip component along the San Andreas fault itself, and a shortening component beside it. This model, together with a previous study's insight, brings otherwise contradictory cumulative-slip estimates of approximately 240 km and 160 km for the southern San Andreas fault into agreement. Chapter 4 presents new fault-kinematic data, and sequential reconstructions of the San Gabriel block as maps and cross sections, suggesting that the anticlinorium is in the hanging wall of a detachment fault, rather than the exhumed footwall as previously suggested. New geochronologic and geochemical data support correlation of the anticlinoria and constrain the onset of extension to ca. 26-25 Ma.
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:
Download or read book The San Andreas Fault System written by Robert E. Powell and published by Geological Society of America. This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors of the ten chapters in this volume critically examine the geologic evidence that constrains timing and magnitude of movement on various faults of the San Andreas system, and they develop and discuss paleogeologic reconstructions based on these constraints. The volume offers new insight into the evolution of the San Andreas fault system,
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.
Download or read book Proceedings of the Conference on Tectonic Problems of the San Andreas Fault System written by and published by . This book was released on 1973 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southern San Andreas Fault written by and published by . This book was released on 1997 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Geologic Slip Rates Since Early Pleistocene Initiation of the San Jacinto and San Felipe Fault Zones in the San Andreas Fault System Southern California USA written by and published by Geological Society of America. This book was released on 2010-01-01 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The San Jacinto right-lateral strike-slip fault zone is crucial for understanding plate-boundary dynamics, regional slip partitioning, and seismic hazards within the San Andreas fault system of southern California, yet its age of initiation and long-term average slip rate are controversial. This synthesis of prior and new detailed studies in the western Salton Trough documents initiation of structural segments of the San Jacinto fault zone at or slightly before the 1.07 Ma base of the Jaramillo subchron. In Special Paper 475, five new estimates of displacement are developed using offset successions of crystalline rocks; distinctive marker beds in the late Cenozoic basin fill; analysis of strike-slip-related fault-bend folds; quantification of strain in folds at the tips of dextral faults; and gravity, magnetic, and geomorphic data sets."--Publisher's website.
Download or read book Displacement Along the San Andreas Fault California written by John C. Crowell and published by Geological Society of America. This book was released on 1962 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tectonics of the Juncture Between the San Andreas Fault System and the Salton Trough Southeastern California written by John C. Crowell and published by . This book was released on 1979 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Timing of Extension North south Shortening and Conjugate Strike slip Faulting in the Evolution of the Chocolate Mountains Anticlinorium written by and published by . This book was released on 2010 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gavilan Hills contain a complex record of how North American continental crust responded to the switch from low angle subduction to the embryonic development of the San Andreas fault system. Within this area, major detachment faults relating to exhumation of the Orocopia Schist include the Chocolate Mountains and Gatuna faults. Though published Ar-Ar thermochronology indicates that movement along the Gatuna fault occurred sometime between about 28 and 24 Ma, our field data and published geochronology shows that the hanging wall block of the Gatuna fault includes a thick (~1.2 km) highly faulted and extended section of ~23 Ma volcanic and epiclastic rocks. Though this relationship does not rule out movement between 28 and 24 Ma, it does indicate that final displacement along the Gatuna fault occurred after ~23 Ma. Following movement on the Gatuna fault, the section of ~23 Ma volcanic and epiclastic rocks, along with all older formations and structures, were folded about the Chocolate Mountains anticlinorium. Subsequent to this initial phase of fold growth, three unconformably bounded alluvial sequences of the Bear Canyon conglomerate were deposited and then successively folded about the anticlinorium as it grew episodically. During this interval of fold growth, a conjugate set of dextral and sinistral strike-slip faults and shear zones transected the ~23 Ma unit of volcanic and epiclastic rocks. Some of these faults offset the axis of the anticlinorium or associated second order folds. Because the Indian Pass fault, the western most fault in the set of dextral strike-slip faults, cuts the ~9 to ~13 Ma basalts of Black Mountain, we interpret the conjugate set of faults and shear zones to have fanned after this date, and to represent a period of pronounced north-south shortening. The Eastern California Shear Zone (ECSZ) is a broad zone of dextral strike-slip faults that transect the Mojave Desert and Death Valley regions. It has played a major role in accommodating the dextral shear between the Pacific and North American plates prior to the formation of the San Andreas fault. According to published literature faults of the ECSZ cut and displace ~20 Ma elements of an early Miocene extensional belt and transect and displace a tuff that was deposited about 13.4 ± 0.2 Ma. This history is remarkably similar to that summarized above for the Gavilan Hills. Hence, we argue that the growth of the Chocolate Mountains anticlinorium following eruption of the ~9 – 13 Ma basalts of Black Mountain reflects north-south shortening as the ECSZ extended southward to the latitude of the Gavilan Hills. In short, our work suggests that the Gavilan Hills contains a complete record of the response of continental crust to the transition from low angle subduction of the Farallon plate to the early embryonic stages of the modem San Andreas fault
Download or read book San Andreas Fault in Southern California written by John C. Crowell and published by . This book was released on 1975 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reflections on the San Andreas San Gabriel Faults written by Robert H. Paschall and published by . This book was released on 2007 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The San Andreas Fault Zone written by William A. Szary and published by . This book was released on 2019-10-21 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The San Andreas Fault Zone covers almost the entire length of western California. Some sections are simple while others are more complex extending from the Gulf of California through the Salton Trough into the San Gabriel and San Bernardino Mountains, through the Carrizo Plain into Parkfield, on into the San Francisco Bay, Point Reyes, and ending in the Mendocino Triple Junction. This book attempts to characterize the geologic structure, geophysics, and stratigraphy on both sides of the fault. Chapter 1 presents an overview of the setting of the San Andreas Fault System. Chapter 2 discusses the Salton Sea Trough, the Gulf of California, and the Imperial Valley. Chapter 3 presents the fault zone through the Transverse Ranges, mainly consisting of the San Gabriel and the San Bernardino Mountains. Chapter 4 addresses the creeping segment of the Carrizo Plain, Cholame, and Parkfield. Chapter 5 focuses on the San Andreas-Calaveras Fault junction along the San Benito segment. Chapter 6 discusses the South San Francisco Bay area, mainly in Santa Clara County before addressing the San Francisco Bay in Chapter 7. Chapter 8 focuses on the Point Reyes Peninsula, providing some details on the stratigraphy and structure on the peninsula. Chapter 9 closes out with a seismic review of the Mendocino Triple Junction and its interactions with the Pacific, Gorda, and North American plates.
Download or read book Southern San Andreas Crustal Deformation written by J. Beavan and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Constraining the Miocene Slip History of the Southern San Andreas Fault Through Sedimentary Provenance Analysis written by Jacqueline Giblin and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tectonic reconstructions of the southern San Andreas Fault (SAF) system (California, USA) have produced conflicting estimates of cumulative strike-slip offset from middle Miocene to present. We propose that the sedimentary record can resolve both spatial and temporal development of this system, allowing us to reconstruct the paleogeography of this system in the past 10 Ma. An important, but unresolved consideration is whether the Miocene Coachella Fanglomerate, located on the northwestward migrating Pacific side of the dextral SAF transform plate can be correlated to the Bear Canyon Conglomerate located ~200 km to the southeast in the foothills of the southerly Chocolate and Cargo Muchacho Mountains. We report new sedimentology, geochemistry, and U-Pb detrital zircon provenance data to test the paleogeographic connection of these two units and introduce new fault restorations. New integrated provenance data show both similarities and differences between the units. For example, units contain basaltic andesite clasts with elevated potassium concentrations, a distinctive composition found in basalt flows in the southeastern Chocolate Mountains. Additionally, detrital zircon U-Pb analyses from both formations exhibit a predominantly Jurassic age peak and smaller Paleoproterozoic peak. Although the complete detrital zircon distributions from both formations are statistically different - the Bear Canyon Conglomerate also reports Miocene and Mesoproterozoic age - our results imply that the Coachella Fanglomerate and Bear Canyon Conglomerate may have had multiple shared sources during deposition. These new findings support a southerly source of the Coachella Fanglomerate consistent with ~215 km of offset along the southern SAF in the past 10 Ma.
Download or read book A Land in Motion written by and published by University of California Press. This book was released on 1999 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a beautifully illustrated general-interest book on the most famous fault on Earth. The San Andreas Fault, site of the San Francisco earthquake of 1906 and many others, is the boundary between two of the earth's crustal plates, and it is a major architect of California's diverse landscapes.
Download or read book Earthquake Hazards and Tectonic History of the San Andreas Fault Zone Los Angeles County California written by Allan G. Barrows and published by . This book was released on 1985 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
