However, the significant thinning of the chloritic breccia zone to the southwest of the Whipple Mountains may have caused the poor image of the WDF on the CALCRUST profiles. Download Free PDF. B. die Whipple Mountain Detachment Fault. Oxygen isotope compositions of epidote and quartz from chloritic breccias that underlie the detachment fault in the metamorphic core complex of the Whipple Mountains yielded quartz-epidote fractionations that range from 4.1 to 6.4 per mil and increase systematically toward the fault. As first described by Greg Davis (circa, 1982) for the Whipple Mountains; a listric normal fault Detachment Fault Model Detachment faulting is thought to have played an important role in the Tertiary evolution of the Sacramento Mountains, so it is necessary to expand upon a simple reference to the process. Rapid upward transport of mid-crustal mylonitic gneisses in the footwall of a Miocene detachment fault, Whipple Mountains, southeastern California. Il précise alors comment certaines épreuves ont été modifiées, d’autres ajoutées ou retirées. Geology, 1994. The footwall was exhumed from below the brittle–ductile transition and has a ∼3.5 km thick mylonite zone with the same shear sense as the brittle slip on the detachment surface and that is … Crystalline rocks of the lower plate are exposed in the core of a complex dome, and are separated into two structural domains by the Whipple mylonitic front. Below the fault is a chlorite breccia zone, up to 400 feet thick, whose rocks have been altered, faulted, and brecciat ed. the Whipple Mountain Detachment Fault. Estimation du changement de règle (9000 hab) Estimation élaborée le 17 Janvier 2020, la règle a subi plusieurs modifications depuis mais donne idée de l'impact du changement En attendant les publications des données sur les élections municipales, je vous propose de découvrir l'impact du changement des règles pour les élections municipales 2020. Mylonitic gneisses of upper greenschist to middle amphibolite facies grade are exposed below the Whipple detachment fault in the Whipple Mountains metamorphic core complex. en The latter is underlain by blind reverse faults probably merging into a detachment fault … These fractionations give mean temperatures that decrease from approximately 432 … Meaning of Detachment fault. The present-day landform of the Whipple Mountains is a series of sub-parallel ridges trending northwest to southeast, cut at right angles by a large wash, (Whipple Wash), which bisects the entire range.These linear ridges mark the tops of tilted crustal blocks lying in the hanging wall of an extensive detachment fault, and the range as a whole comprises one of the best exposed … Compared to the main detachment, MDs … WikiMatrix. The mylonitic front is a gradational SW-dipping contact between Tertiary mylonitic gneisses and structurally higher, … We conclude that a large rollover growth structure formed in the hanging wall of the Whipple detachment fault shortly prior to emplacement of the voluminous War Eagle landslide (megabreccia). The footwall of this fault exhibits a range of mid-crustal rocks deformed near the brittle-ductile transition, including mylonites, cataclasites, and pseudotachylites, which provide insight into mid-crustal … OSTI.GOV Conference: Evidence for late movement on the Whipple detachment fault, southeastern California The low-angle Whipple Mountains detachment fault divides the crust into upper and lower plates. These axes coincide with the major or long axes of fault corrugations (Figure 2c). Whipple Mtn. ↑ Davis GA. (1988). ↑Fossen H. (1992). Jane Selverstone. dipping Whipple detachment fault of southeastern California, and western Arizona, for example (Fig. Dorsey, R.J., and Roberts, Patricia, 1996, Evolution of the Miocene north Whipple basin in the Aubrey Hills, western Arizona, upper plate of the Whipple detachment fault, in Beratan, K.K., ed., Reconstructing the history of Basin and Range extension using sedimentology and stratigraphy: Geological Society of America Special Paper 303, p. 127-146. Journal of Structural Geology, 14:1033–1046. Whipple detachment fault). About me ¡Hola! Davis and Lister [1989] attributed this discordance to multiple … en Detachment fault related shear zones can be found in southeastern California, e.g. Journal of Structural Geology, 14:1033–1046. Fabric and microstructural analyses of the thick (>3.5 km) mylonitic sequence indicate that it represents an intracrustal zone of non-coaxial laminar flow with a predominant sense of northeastward shear. My name is Claudia. Samples from the main Whipple detachment fault were collected at WA, BW1, BWSK, and BWNL. cataclastic and ultracataclastic rocks (including pseudo- Whipple Mountains metamorphic core complex (Figure 1 tachylyte), and (4) chlorite-epidote alteration of the mylo- and Table S1 of the auxiliary material), with most attention nites. Rapid upward transport of mid-crustal mylonitic gneisses in the footwall of a Miocene detachment fault, Whipple Mountains, southeastern California. These fractionations give mean temperatures that decrease from ∼432°C at 50 meters below the fault … Oxygen isotope compositions of epidote and quartz from chloritic breccias that underlie the detachment fault in the metamorphic core complex of the Whipple Mountains yielded quartz-epidote fractionations that range from 4.1 to 6.4 per mil and increase systematically toward the fault. Download books for free. Free PDF. The Whipple detachment fault in E. California is a classic example of a large-displacement (~40 km), low-angle normal fault formed during Miocene Basin and Range extension. The role of extensional tectonics in the Caledonides of South Norway. PDF. They are younger than or coeval with chloride brecciation, and those that record shear typically are either moderately northeast-dipping normal structures or steep, northwest-striking, southwest-down structures … However, the my- lonitic foliation generally dips 5 o to 25 o more steeply than the fault [Davis, 1988]. Rapid upward transport of mid-crustal mylonitic gneisses in the footwall of a Miocene detachment fault, Whipple Mountains, southeastern California. The Whipple detachment fault (WDF) is a low-angle normal fault (LANF) that accommodated 40–50 km of top-NE extension from ∼25 to 16 Ma (Davis et al., 1980). The absence of a detachment … Information and translations of Detachment fault in the most comprehensive dictionary definitions resource on the web. ↑ Davis, G.A. To link to the entire object, paste this link in email, IM or document To embed the entire object, paste this HTML in website To link to this page, paste this link in email, IM or Definition of Detachment fault in the Definitions.net dictionary. Continued extensional evolution of the Whipple detachment fault caused tilting of the upper‐plate strata and the formation of numerous half and full grabens as well as roll‐over structures. A short summary of this paper. Photo by C.Roig. Chloritic breccias beneath the Whipple detachment fault (WDF) have much lower seismic impedance than that of rocks occurring both structurally above and below. ↑Haakon Fossen. PDF. PDF. Download PDF Package. Within the Whipple Mountains, the detachment fault often crops out as a ledge of impermeable micro breccia. What does Detachment fault mean? Le client | Grisham John | download | Z-Library. It is along such contacts that the cataclasite appears to be best developed. ^Fossen H. (1992). Brittle structures in the upper 200 m of the footwall of the Whipple detachment fault are used to characterize the state of stress under which the detachment slipped. de Abscherungen des Kernkomplextyps sind sehr häufig im südöstlichen Kalifornien anzutreffen, so z. This paper. The role of extensional tectonics in the Caledonides of South Norway. Journal of Structural Geology, 14, 1033-1046. The detachment faul tis characterized by a typically smooth, planar fault surface which is … Prominent crustal reflections beginning at 3-4 s were recorded on CALCRUST seismic profiles southwest of the Whipple Mountains. By contrast, LANF fault rocks exhumed from the mid-crustal brittle–plastic transition at temperatures of 250 to 420 °C, several LANFs (the Woodlark Basin detachment, Zuccalle Fault, and the Whipple Detachment) exhibit compelling field evidence for overpressure, such as fault-parallel tensile veins (Roller et al., 2001, Collettini et al., 2006, Selverstone et al., 2012) The role of extensional tectonics in the Caledonides of South Norway. Tertiary sedimentation along the Lake Mead fault system, Virgin Mountains, Nevada-Arizona Premium PDF Package. Stress state and fluid-pressure level along the Whipple detachment fault, California. The Whipple detachment fault apparently developed within crystalline rocks, but in some places now separates upper-plate Tertiary sedimentary and volcanic rocks from lower-plate cryste.lline rocks. Download Full PDF Package. I’m a Ph.D student working with Dr. Chloë Bonamici in the fields of metamorphic petrology and stable isotope geochemistry at the University of Wisconsin-Madison. ^ Davis GA. (1988). Find books The rock record of seimic nucleation: a case study from the Whipple Mountains Detachment Fault, eastern California Daniel Ortega-Arroyo, Whitney M. Behr, & Emilie Gentry Submitted August 15, 2017, SCEC Contribution #7686, 2017 SCEC Annual Meeting Poster #114 Despite advances in our understanding of the physics of earthquakes, the mechanisms by which … Rocks from the lower plate were brought to the surface during the later stages of detachment‐fault activity thereby producing sufficient topographic relief for large landslides to … Le résultat de ces … In order to interpret these seismic reflections and to understand why detachment faults are imaged on some profiles but not on others, we collected oriented rock specimens from all major structural units in the Whipple … 1992. Yin, A., and Dunn, J.F., 1992, Structural and stratigraphic development of the Whipple-Chemehuevi detachment fault system, southeastern California: Implications for the geometrical evolution of domal and basinal low-angle normal faults: Geological Society of America Bulletin, v. 104, p. 659-674. plate of the Whipple detachment fault are defined by my- lonitic foliation and sheetlike granitic plutons [Davis et al., 1980, 1982]. PDF. Detachment Fault, CA. Brecciated clasts within this zone have a matrix of chlorite, epidote, silica, and sulfide minerals, especially pyrite; the alteration and mineralization render … In the Whipple Mountains, just the exposed portion of the detachment fault is more than 30 … 1988. 1), has an areal extent in excess of 10,000 km 2, involves a relative displacement of at least 40 km, and juxtaposes rock types with radically different geological histories (Davis & Lister 1988). 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