The major aims of this paper are to: (i) characterise the rock types that constitute the Gruf complex, their field relations and the relations with the adjacent Chiavenna ophiolite and the Bergell pluton; (ii) perform a coherent structural analysis; (iii) investigate the field characteristics ...
The intensity of Alpine strain varies, either from one unit to the next, or even within similar rock types and/or within the same unit. In the EMC, small volumes of rocks (about 0.01 9 0.01 9 0.1 km) that were left undeformed by the Alpine orogeny have been found, e.g. in the ...
Rb Sr whole rock analyses from metagranites and gneisses of the Palaeozoic suite of the Mulhacen Complex of the Betic Cordilleras, southern Spain, yield errorchrons of between 275 and 191 Ma. Several K Ar tourmaline ages of these rock units are higher than the corresponding whole-rock ages, ...
Nevertheless, an Alpine origin in both rock types is considered likely because (i) evidence for Variscan garnet growth has previously only been found in high-grade gneisses not studied herein, (ii) inclusion trails of garnets in samples from cover and basement rocks have similar orientations as...
Two fresh types of eclogites,namely the massive eclogite and foliated eclogite,are discernible in large eclogite bodies surrounded by country rock gneisses from the Dabie (大别)-Sulu (苏鲁) UHP metamorphic zone.They are different in mineral assemblage,texture and structure at various scales.The ...
Here we describe the structure, the high-pressure, low-temperature (HP-LT) metamorphism and tectonic evolution of the Briançonnais distal margin units from the south Western Alps. The studied area extends southwest of the Dora-Maira (U)HP basement uni
Grouping of rock units and associated boreholes The resulting geological map (Figure 4) covering the Montagnes District comprises 26 rock units. Only 15 of these 26 rock units are intersected by the 445 boreholes in the ONEP database used in this work, as described in Section 3.2. In or...