Deformation structures associated with the Trachyte Mesa intrusion, Henry Mountains, Utah: Implications for sill and laccolith emplacement mechanisms
نویسندگان
چکیده
منابع مشابه
Emplacement and Assembly of Shallow Intrusions, Henry Mountains, Southern Utah
Exceptional exposures of igneous intrusions of the Henry Mountains of southern Utah allow for the detailed study of three-dimensional pluton geometries as well as igneous emplacement and assembly processes. Examination of the geometry, fabric, and wallrock structures of relatively small intrusions (<3 km map-view diameter) suggests that several plutons in the region (Maiden Creek sill, Trachyte...
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Numerous geological observations evidence that inelastic deformation occurs during sills and laccoliths emplacement. However, most models of sill and laccolith emplacement neglect inelastic processes by assuming purely elastic deformation of the host rock. This assumption has never been tested so that the role of inelastic deformation on the growth dynamics of magma intrusions remains poorly un...
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Felsic magma commonly pools within shallow mushroom-shaped magmatic intrusions, so-called laccoliths or cryptodomes, which can cause both explosive eruptions and collapse of the volcanic edifice. Deformation during laccolith emplacement is primarily considered to occur in the host rock. However, shallowly emplaced laccoliths (cryptodomes) show extensive internal deformation. While deformation o...
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[1] Field data from channels in the Henry Mountains of Utah demonstrate that abundant coarse sediment can inhibit fluvial incision into bedrock by armoring channel beds (the cover effect). We compare several small channels that share tributary junctions and have incised into the same sedimentary bedrock unit (Navajo Sandstone) but contain differing amounts of coarse diorite clasts owing to the ...
متن کاملAnalytical model of surface uplift above axisymmetric flat-lying magma intrusions: Implications for sill emplacement and geodesy
In this paper, we develop a new axisymmetric analytic model of surface uplift upon sills and laccoliths, based on the formulation of a thin bending plate lying on an elastic foundation. In contrast to most former models also based on thin bending plate formulation, our model accounts for (i) axi-symmetrical uplift, (ii) both upon and outside the intrusion. The model accounts for shallow intrusi...
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ژورنال
عنوان ژورنال: Journal of Structural Geology
سال: 2016
ISSN: 0191-8141
DOI: 10.1016/j.jsg.2016.04.001