Granite Pluton Geometry and Emplacement Mode Inferred from Combined Fabric and Gravity Data

摘要: This review is based on several years of joint structural and geophysical surveys granites. Fabric measurements include lineations foliations, the former being more useful in understanding magma strain pattern a pluton. Through inversion gravity data, which particularly sensitive to density contrasts, shape at depth pluton, its floor, may be derived with good confidence. Vertical lineations, when associated deepening pluton’s are interpreted as feeder zones. Correlation between inner-pluton lineation regional deformation field helps inferring emplacement mode Combined data therefore allow us describe two main types plutons. Flat-floored plutons rather thin (a few kilometres), extend largely every horizontal direction, have They emplaced sills upper crust, or within ductile environments extensionnal tectonic contexts. These contrast thick (more than 10 kilometres) wedge-shaped plutons, extending one direction along root zones appear, V-shaped transverse section, correspond infilling dilatant volumes brittle crust during transcurrent tectonics.