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An analysis of the factors that control fault zone architecture and the importance of fault orientation relative to regional stress
Fault reactivation and strain partitioning across the brittle-ductile transition
Volcanic Initiation of the Eocene Heart Mountain Slide, Wyoming, USA
Fault welding by pseudotachylyte formation
Abstract Elucidation of the internal structure of fault zones is paramount for understanding their mechanical, seismological and hydraulic properties. In order to observe representative brittle fault zone structures, it is preferable that the fault be passively exhumed from seismogenic depths and the exposure must be in arid or semi-arid environments where the fragile rocks are not subject to extensive weathering. Field observations of two such faults are used to constrain their likely mechanical properties. One fault is the Carboneras fault in southeastern Spain, where the predominant country rocks are phyllosilicate-rich lithologies, and the other is part of the Atacama fault system in northern Chile, where faults pass through crystalline rocks of acidic to intermediate composition. The Carboneras fault is a left lateral fault with several tens of kilometres offset exhumed from approximately 4 km depth, and displays multiple strands of clay-bearing fault gouge, each several metres wide, that contain variably fractured lenses of protolithic mica schists. The strain is evenly distributed across the gouge layers, in accordance with the measured laboratory mechanical behaviour which shows predominantly strain hardening characteristics. The overall width of the fault zone is several hundred metres. Additionally, there are blocks of dolomitic material that are contained within the fault zones that show extremely localized deformation in the form of faults several centimetres wide. These are typically arranged at an angle of c . 20° to the overall fault plane. These differing types of fault rock products allow for the possibility of ‘mixed mode’ seismicity, with fault creep occurring along the strands of velocity strengthening clay-rich gouge, punctuated by small seismic events that nucleate on the velocity weakening localized faults within the dolomite blocks. The Caleta Coloso fault in northern Chile has a left-lateral offset of at least 5 km and was exhumed from 5–10 km depth. The fault core is represented by a 200–300 m wide zone of hydrothermally altered protocataclasite and ultracataclasite. This is surrounded by a zone of micro and macro-fractures on the order of 150 m thick. The fault core shows a heterogeneous distribution of strain, with alternate layers of ultracataclasite and lower strain material. The strain-weakening behaviour of crystalline rocks might be expected to produce highly localized zones of deformation, and thus the wide core zone must be a result of additional process such as precipitation strengthening or geometric irregularities along the fault plane.
The Memorial Lychgate at St Mary’s Church, Whitkirk, Leeds
Basin-Floor Fans in the North Sea: Sequence Stratigraphic Models vs. Sedimentary Facies
Comment and Reply on "Kink detachment fold in the southwest Montana fold and thrust belt"
Kink detachment fold in the southwest Montana fold and thrust belt
Reservoir Description Applied to Iatan East Howard Field, Mitchell County, Texas: ABSTRACT
Early Tournaisian rocks at Lilleshall, Shropshire
The age of the Dinantian (Lower Carboniferous) rocks proved beneath the Kent Coalfield
Abstract Uranium and silica were leached from volcanic rock of the Mesa Formation and percolated downward to collect along the generally impermeable Cretaceous limestone. Organic matter and pyrite in the limestone furnished the reducing conditions that precipitated the uranium in a hexavalent state.