European Lithosphere Dynamics (Geological Society Memoirs by D. G. Gee and R. A. Stephenson, Editors

By D. G. Gee and R. A. Stephenson, Editors

Europe presents an excellent box laboratory for learning lithospheric procedures via time, for tracing the tectonic evolution of crust and mantle from the current some distance again into the early Precambrian. issues are fairly notable: the significance of plate tectonics throughout the Phanerozoic and during the Proterozic into the Archeaen, and the importance of tectonic inheritance, older buildings and rheologies guiding the more youthful evolution. 'European Lithosphere Dynamics' grew out of an important ecu technology beginning programme, EUROPROBE, with participation of many enormous quantities of Earth scientists from in every single place Europe. the most examine actions all in favour of particular aim components and concerned integration of geological, geophysical and geochemical tools. Defining surface-depth relationships was once a prerequisite for interpretation of the procedures, current and earlier, chargeable for the formation of the lithosphere. This Memoir addresses the main positive factors of the ecu lithosphere and is geared toward giving the reader an outline in their improvement and development in the course of 3 billion years of Earth historical past.

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4). The MONA LISA Working Group (1997) detected subhorizontal seismic reflections at a depth of c. 80 km in the North Sea area, which can be interpreted as being close to the lithospheric base. In one case such reflectors are observed on two crossing profiles, thus ruling out side-swipes and other artefacts. g. Fig. 2d). Little is known about the structure of the subcrustal lithosphere of the British and Irish Caledonides; most upper mantle studies are restricted to the Iapetus Suture separating the Laurentian and Avalonian continents.

Similar linear velocity anomalies are seen beneath other Cenozoic subduction systems (the Alps, the Hellenic arc; see Fig. 4a and d, and discussion below); but surprisingly, there is no seismic sign of a subducting slab beneath the Caucasus, despite the presence of a strong positive gravity anomaly (Fig. 5). Thermal models. Surface heat flow in the Variscides is high, c. 7 0 - 100 mW m - 2 (Fig. 3), and locally it significantly exceeds these values (Cermak 1995). Strong negative isostatic gravity anomalies ( - 4 0 to - 6 0 reGal; Fig.

Rhenish Massif(RM). The intensive volcanism of the RM began in the Eocene with an eruption of nephelinitic magma (Wilson et al. 2004), which implies a lithospheric thickness of at least 80-100 km. At c. 25 Ma the composition of magmas changed to basalts and trachytes with a depth of generation < 6 0 - 8 0 km. The youngest volcanic areas in the western part of the RM have an age of c. 700 ka (Lippolt 1983). Uplift of the RM began in the late Oligocene and still continues. The upper mantle structure beneath the RM is asymmetric according to different geophysical data.

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