Download Tectonics, Magmatism and Metallogeny of Mongolia by A. B. Dergunov PDF

By A. B. Dergunov

This quantity offers the 1st systematic description of crucial geological buildings of Mongolia and discusses the most positive factors of those constructions and their interactions. the most features of magmatism are defined for every level of tectonic improvement and the evolution of magmatism is taken into account just about lithosphere improvement. Mongolia is a key zone of the realm and this quantity presents a prime resource of reference for postgraduates and researchers.

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Tectonics, Magmatism, and Metallogeny of Mongolia 36 The Dzhidin Zone This (Fig. 1- ) occupies the eastern part of Prikhubsugulye, in North Mongolia. Its western boundary with the Tuvin-Mongolian Massif has been reliably established. It runs along the eastern bank of Lake Khubsugul. The northern continuation of the Dzhidin Zone is inferred from the Palaeozoic age of the Khamar-Daban Ridge metamorphic rocks (Belichenko and Boos, 1990). The vast fields of Palaeozoic granitoids and Upper Palaeozoic volcanics form the southern boundary of the Dzhidin Zone.

It is the most obvious example of a palaeo-oceanic basin in Central Mongolia. High-angle faults trending NW–SE currently bound the ophiolitic band to the north-east. To the north of the Bayan-Khongor Zone they separate the ophiolitic zone from the rift zone of the Dzabkhan microcontinental margin and, to the south—from the Caledonian turbidite zone. In the same way, the north-eastern boundary of the ophiolites cuts the structuralformational zonation of the Bayan-Khongor Zone at a low angle. , 1997).

On the western and eastern margins, the layers are much more steeply dipping, and the southern and northern terminations are characterized by imbricate thrusts and nappe systems forming zones of crustal thickening as, for example, in the Khan-Khuhei Zone, on the southern slope of the ridge of the same name. The key section of the Vendian-Lower Cambrian formations of the Ozernaya Zone is exposed in the middle part of the Ser Ridge, which bounds some large lakes to the north: Lakes Khara-Us-Nur, Dayan-Nur and Khara-Nur.

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