Структурная и метаморфическая эволюция синтаксиса Нанга-Парбат, Пакистанские Гималаи, на разрезе ущелья Индус: важность ранних событий

Field relationships are as important as radiometric age data for unravelling the history of polycyclic metamorphic  regions. Field and petrographic data were used to investigate such a region, the Nanga Parbat syntaxis - a major Ntrending transverse structure in the Pakistan Himalayas. Continental rocks of the Indian plate are exposed in the core of  this structure due to uplift relative to the surrounding and structurally higher amphibolites of the overthrust Kohistan Island Arc. In the Indus gorge, the Indian plate gneisses are migmatitic, highly deformed and cut by Himalayan granite sheets. Field relationships show that the migmatization pre-dates the emplacement of a suite of basic intrusive sheets (now amphibolites) which are themselves unlikely to be Himalayan; these amphibolite sheets are cut by the Himalayan granite sheets. There is therefore no genetic link between the granites and the migmatization: the latter might be Precambrian.

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