Emplacement of the Aya Variscan granitic pluton (Basque Pyrenees) in a dextral transcurrent regime inferred from a combined magneto-structural and gravimetric study

Autor:	F. Vadeboin, Philippe Olivier, H. Richen, L. Améglio
Rok vydání:	1999
Předmět:	Igneous rock Lineation Sinistral and dextral Pluton Tectonic phase Geology Petrology Gravity anomaly Seismology Diorite Mylonite
Zdroj:	Journal of the Geological Society. 156:991-1002
ISSN:	2041-479X 0016-7649
DOI:	10.1144/gsjgs.156.5.0991
Popis:	Magmatic structure, three-dimensional shape and emplacement mode of the Aya pluton, Variscan Pyrenees, have been studied by combining magneto-structural and gravimetric studies. The Aya pluton displays a fabric, acquired using the anisotropy of magnetic susceptibility technique, comparable to that of several other plutons in the Pyrenees, with shallow-plunging lineations and steep foliations trending E-W and NE-SW, forming an S pattern in map view. Gravity modelling was used to determine the probable root of the pluton, directly below the most basic (gabbro-dioritic) facies. This has a funnel shape, with an E-W-trending elliptical horizontal section and a maximum depth of 3.5 km. These different data demonstrate that this pluton was synorogenically emplaced during the main D2 Variscan tectonic phase, in a dextral transcurrent regime.
Databáze:	OpenAIRE
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