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Opposing shear senses in a subdetachment mylonite zone: Implications for core complex mechanics
[1] Global studies of metamorphic core complexes and lowâangle detachment faults have highlighted a fundamental problem: Since detachments excise crustal section, the relationship between the mylonitic rocks in their footwalls and the brittle deformation in their hanging walls is commonly unclear. Mylonites could either reflect ductile deformation related to exhumation along the detachment fault, or they could be a more general feature of the extending middle crust that has been âcaptured â by the detachment. In the first case we would expect the kinematics of the mylonite zone to mirror the sense of movement on the detachment; in the second case both the direction and sense of shear in the mylonites could be different. The northern Snake Range dĂ©collement (NSRD) is a classic Basin and Range detachment fault with a wellâdocumented topâeast of displacement. We present structural, paleo-magnetic, geochronological, and geothermometric evidence to suggest that the mylonite zone below the NSRD locally experienced phases of both east â and westâdirected shear, inconsistent with movement along a single detachment fault. We therefore propose that the footwall mylonites represent a predetachment dis-continuity in the middle crust that separated localized deformation above from distributed crustal flow below (localizedâdistributed transition (LDT)). The mylonites were subsequently captured by a moderately dipping brittle detachment that soled down to the middle crust and exhumed them around a rolling hinge into a subhorizontal orientation at the surface, produc-ing the presentâday NSRD. In this interpretation the brittle hanging wall represents a series of rotated upper crustal normal faults, whereas the mylonitic footwall represents one or more exhumed middl
Sandra Walker, Floyd Walker v. Mary Hansen, Jeffery Potkins, RT Systems : Brief of Appellant
Appeal from a Judgment of Third Judieial District Court of Salt Fake County, Stale of Utah Honorable William W. Bolhin
Melvyn Bircoll and Janine Bircoll, individuals v. Southwest Marble & Granite, Inc., a Utah corporation, et. al. : Reply Brief
RESPONSE BRIEF OF THE APPELLANT APPEAL FROM THE TRIAL COURT, JUDGE LUDLOW and MOTION TO BE EXCUSED FROM COMPLIANCE WITH STANDING ORDER
Melvyn Bircoll and Janine Bircoll, individuals v. Southwest Marble & Granite, Inc., a Utah corporation, et. al. : Reply Brief
RESPONSE BRIEF OF THE APPELLANT APPEAL FROM THE TRIAL COURT, JUDGE LUDLOW and MOTION TO BE EXCUSED FROM COMPLIANCE WITH STANDING ORDER
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