Internal fabric and strike-slip emplacement of the Pan-African granite of Solli Hills, northern Nigeria

Article Abstract:

The Pan-African granite of Solli Hills, northern Nigeria, is ferromagnetic and has significant amounts of magmatic microstructures. Asymmetrical zoning of petrographic types, susceptibility magnitudes and planar linear magnetic fabrics are other significant features of the pluton. Constant magnetic foliations and lineations exist in the pluton at about N 20 deg E and N 205 deg E, respectively. A dextral strike-slip synplutonic event could have caused deformations in the pluton and adjoining country-rock envelope.

Nigeria, Geology, Structural, Structural geology, Granite, Intrusions (Geology)

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Structural evolution of the northern Los Angeles basin, California, based on growth strata

Article Abstract:

A growth strata analysis shows that the formation of the south facing monocline of the Los Angeles basin, California, involved extension during the Miocene. This produced a large amount of volcanic and volcaniclastic rocks. Contractions during Pliocene reactivated the normal faults, produced during Miocene, in the opposite direction, and formed monocline and secondary compressive structures. During the Pliocene-Pleistocene progressive limb rotation took place as the dip increased with age.

Geology, Stratigraphic, Stratigraphy, Los Angeles Metropolitan Area

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Magma emplacement during arc-perpendicular shortening: an example from the Cascades crystalline core, Washington

Article Abstract:

Geophysical data derived from the Mount Stuart batholith, Cascades crystalline core in Washington provides evidence on how host rocks are displaced during magma emplacement in shortening and thickening orogens. Rock material transfer processes revealed characteristics such as ductile downward flow, stoping, regional folding, thrusting and subhorizontal arc-parallel extension. It can be concluded that these attributes are typical in all active arcs.

Stress-strain curves, Cascade Range

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