Peralkaline granitoid magmatism in the Mongolian–Transbaikalian Belt: Evolution, petrogenesis and tectonic significance

Melting Conditions of Granitoid Xenoliths in Contact With Alkaline Mafic Magma (Gusinoozerskaya Dyke, Western Transbaikalia): To the Problem of the Origin of Ultrapotassic Acid Melts

“…Геолого-петрологические доказатель-ства подобной модели базируются на свидетель-ствах пространственно-временной ассоциации кис-лых и основных магматических пород и изотопно-геохимических признаках участия мантийного ве-щества в формировании некоторых гранитоидов [Yarmolyuk, Kovalenko, 1991;Jahn et al, 2009;Litvinovsky et al, 2011]. Использование изотопно-геохими-ческого подхода предопределено тем, что в боль-шинстве случаев гранитоиды кристаллизовались из магм, удаленных на значительное расстояние от места их выплавления.…”

An early Paleozoic tectonothermal event in western Mongolia: Implications for regional extension of the Cambrian orogenic belt

“…The Central Asian Orogenic Belt (CAOB) is well known as the largest Phanerozoic orogenic belt on the Earth (Jahn et al, 2009). The CAOB is geologically situated among four cratons (the Baltica, Siberia, North China, and Tarim cratons, Fig.…”

“…1A), and consists mainly of fragments of Precambrian shields, island -arcs, accretionary complexes and ophiolites (Sengör et al, 1993). Many researchers have proposed various tectonic models to explain the formation of this belt (Sengör et al, 1993;Buchan et al, 2002;Jahn et al, 2004Jahn et al, , 2009Kovalenko et al, 2004;Windley et al, 2007;Kröner et al, 2010), but these models are limited by the lack of comprehensive datasets regarding metamorphic P -T -t paths, characteristics of igneous activities, and metamorphic and magmatic ages.…”

Geochemistry of Miocene trachytes in Bugasi, Lhasa block, Tibetan Plateau: Mixing products between mantle- and crust-derived melts?

“…However, the petrogenesis of post-collisional potassic rocks, and in particular the origin of trachytes, remains the subject of considerable debate due to large variations in their radiogenic isotopic composition and degree of enrichment in incompatible elements. Four models are commonly invoked to explain the genesis of trachytes: the partial melting of an enriched lithospheric mantle (e.g., Turner et al, 1996;Miller et al, 1999;Williams et al, 2004;Chung et al, 2005;Rios et al, 2007;Peng et al, 2008;Jahn et al, 2009;Zhao et al, 2009a,b;Huang et al, 2010); fractionation of mantle-derived alkali basalts (e.g., Novak and Mahood, 1986;Yang et al, 2005;Holbig and Grove, 2008); partial melting of lower crust (e.g., Huang and Wyllie, 1981;Litvinovsky et al, 2000;Tchameni et al, 2001;Chen et al, 2010); and mixing between mantleand crust-derived melts (e.g., Zhao et al, 1995;Wickham et al, 1996;Aydin et al, 2008;Yang et al, 2008).…”