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

该项目旨在用多种方法表征古近纪迪纳里期复理岩(DF)的物源，从而详细了解DF盆地及其邻近物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、高级重矿物分析、全岩地球化学、单颗粒矿物和熔体包裹体化学，以及单颗粒裂变径迹和40Ar/39Ar年代学。迪纳里德山脉构成了整个欧洲阿尔卑斯山和希腊山脉之间的高山山脉的中心部分，并呈现出相当复杂的结构。与邻近造山带相比，对其演化的认识水平要低得多。在阿尔卑斯山系内，同构造沉积主要发生在早白垩世晚期至新近纪。很大一部分DF沉积于东阿尔卑斯山-海伦尼德山脉两个主要造山活动时期之间的时间跨度：(A)晚白垩世(早阿尔卑斯造山作用)和(B)晚渐新世以来现代阿尔卑斯链的建立。复理石沉积的这一古近纪时间间隔与鲜为人知的阿尔卑斯山演化时期相吻合。作为一个不同寻常的特征，迪纳里德山脉由三条主要的复理石带组成。外部带代表了前陆盆地充填的基础，但内部复理石单元在中生代晚期的大地构造位置仍是推测的。此外，在阿尔卑斯山链的这一部分是否存在一两个海洋领域也是一个有争议的问题。大多数在古近纪被剥离和侵蚀的岩浆和变质源岩单元今天已不再暴露。因此，应用先进的物源分析方法对东方岩的硅质碎屑岩进行物源分析，是建立迪纳里德现代地球动力学认识的最有希望的方法。

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.