Paleogene geology and exhumation history of the Dinarides as reflected by provenance signatures of synorogenic siliciclastic sediments

本项目旨在通过多方法表征古近系diaridic Flysch （DF）的物源特征，从而详细了解DF盆地及其邻近源区的地球动力学背景和演化。应用的方法包括砂岩岩石学、先进重矿物分析、全岩地球化学、单粒矿物和熔融包裹体化学、单粒裂变径迹和40Ar/39Ar年代学。迪纳里德斯山脉是整个欧洲阿尔卑斯山脉的中心部分，位于阿尔卑斯山脉和希腊勒尼德山脉之间，构造相当复杂。与相邻的造山带相比，对其演化的认识水平要低得多。在阿尔卑斯链内，同构造沉积主要发生在早白垩世晚期至新近纪。DF的大部分沉积时间介于东阿尔卑斯-希腊尼德斯造山活动的两个主要时期(A)晚白垩世（始阿尔卑斯造山运动）和(b)晚渐新世以来现今阿尔卑斯链的建立之间。古近纪复理石沉积的时间间隔与鲜为人知的阿尔卑斯演化时期相吻合。作为一个不寻常的特征，迪纳里德斯包括三个主要的复理石带。外带为前陆盆地填充物的基底，而内复理石单元在晚中生代-陆统时期的大地构造位置仍有待推测。此外，在阿尔卑斯链的这一部分是否存在一个或两个海洋领域也是一个有争议的问题。在古近纪被挖掘和侵蚀的岩浆岩和变质岩源岩单元，今天大多不再暴露。因此，将先进的物源分析方法应用到DF的硅质碎屑岩中，对建立diarides的现代地球动力学认识是最有希望的。

This project aims at a multi-method characterization of the provenance of the Paleogene Dinaridic Flysch (DF), leading to a detailed understanding of the geodynamic setting and evolution of the DF basins and its adjacent source areas. The methods to be applied involve sandstone petrography, advanced heavy mineral analysis, whole-rock geochemistry, single-grain mineral and melt inclusion chemistry, as well as single-grain fission track and 40Ar/39Ar geochronology. The Dinarides form a central part of the entire European Alpine mountain chain between the Alps and the Hellenides and exhibit a rather complicated structure. The level of knowledge on its evolution is much lower compared to the adjacent orogenic belts. Within the Alpine chain, syntectonic sedimentation occurred mainly between late Early Cretaceous and Neogene time. A significant part of DF deposited in the time span between the two major periods of orogenic activities of Eastern Alps-Hellenides (a) Late Cretaceous (Eoalpine orogeny) and (b) the building of the present Alpine chain since Late Oligocene. This Paleogene time interval of flysch deposition coincides with the less known period of Alpine evolution. As an unusual feature, the Dinarides comprise three major flysch belts. The external belt represents the base of a foreland basin fill but the geotectonic osition of the internal flysch units during the Late Mesozoic-Teritary is still speculative. Also, the existence of one or two oceanic realms in this sector of the Alpine chain is a matter of debate. Most of the magmatic and metamorphic source rock units exhumed and eroded in the Paleogene are no more exposed today. Therefore, the application of the advanced methods of provenance analysis to the siliciclastic rocks of the DF are most promising in establishing a modern geodynamic understandig of the Dinarides.