The nature and geological history of the deep crust under the Eifel, Germany

Terra Nova - Tập 4 Số 1 - Trang 53-62 - 1992
H.‐G. Stosch1, A. Schmucker1, Ch. Reys1
1Mineralogisch-Petrographisches Institut der Universität zu Köln Zälpicher Str. 49, W-5000 Köln 1, Germany

Tóm tắt

ABSTRACTThe crust ≈ 10–20 km under the Eifel is composed of amphibolite‐facies metasediments and meta‐igneous rocks of tonalitic to granodioritic composition; mafic granulites occupy the base of the crust down to a Moho depth between about 29 and 34 km. The meta‐granodiorites and meta‐tonalites have I‐type chemical characteristics and appear to have formed approximately 400 Myr ago by partial melting of a lower crustal source. Amphibolite‐facies metamorphism probably followed within the same orogeny. During the Quaternary, many amphibolite‐facies rocks were subjected to contact heating in crustal magma chambers and/or during transport to the earth's surface. Contact heating is also recorded in radiogenic isotope compositions of minerals from one xenolith. A genetic link between meta‐igneous amphibolites and the deeper crustal mafic granulites can neither be proven nor discounted by the isotope data. If there is a genetic relationship, it requires fractionation of a mafic magma in the lower crust and assimilation of metasediments and separation of a highly evolved melt.

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Terra Nova

Tập 4 Số 1

53-62

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