当前位置: X-MOL 学术Geological Mag. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Deciphering the geodynamic evolution of the Dinaric orogen through the study of the ‘overstepping’ Cretaceous successions
Geological Magazine ( IF 2.3 ) Pub Date : 2020-06-15 , DOI: 10.1017/s001675682000045x
Giuseppe Nirta , Martin Aberhan , Valerio Bortolotti , Nicolaos Carras , Francesco Menna , Milvio Fazzuoli

Along the Dinaric–Hellenic orogen, the Late Jurassic – Early Cretaceous ophiolite obduction over the Adria continental margin was sealed by sedimentation of clastic terrestrial deposits rapidly followed by a widespread carbonate platform system since the Early Cretaceous period. These Cretaceous sediments presently crop out over areas of varying extension, from several hundred kilometre wide undeformed continuous covers to small-scale tectonic slivers involved in the tectonic stack following the latest Cretaceous–Palaeogene collision. These deposits are unconformably sedimented above the units formed by the Late Jurassic to Early Cretaceous nappe stacking above the eastern Adria continental margin. We studied these deposits in a large area between western Serbia and eastern Bosnia. In the studied area, these deposits are divided into three lithostratigraphic groups according to their age, depositional environment and type of underlying basement. The Mokra Gora Group sediments (upper Aptian–Maastrichtian) were deposited on top of previously obducted and weathered ophiolites, the Kosjerić Group (Cenomanian–Campanian) overlies composite tectonic units comprising obducted ophiolites and their underlying continental basement portions, while the Guča Group (Campanian–Maastrichtian) exclusively rests on top of continental basement. The reconstructed sedimentary evolution of these groups, together with the comparison with the syn- and post-obduction deposits at the front of the ophiolitic nappe(s) in a wider area of the internal Dinarides (e.g. Pogari Group and Bosnian flysch), allowed us to clarify the obduction mechanisms, including their tectonic context, the changes in depositional environments and the timing of depositional and tectonic events, and, in a wider view, shed light on the geodynamic evolution of the Dinaric belt.

中文翻译:

通过“越界”白垩纪演替研究破译迪纳里克造山带的地球动力学演化

沿着迪纳里克-希腊造山带,阿德里亚大陆边缘的晚侏罗世-早白垩世蛇绿岩俯冲被碎屑陆相沉积物迅速封闭,随后自早白垩世以来出现了广泛的碳酸盐台地系统。这些白垩纪沉积物目前出现在不同延伸的区域,从几百公里宽的未变形连续覆盖层到最近的白垩纪-古近纪碰撞后构造叠层中涉及的小规模构造碎片。这些沉积物不整合地沉积在由晚侏罗世至早白垩世推覆叠置在东阿德里亚大陆边缘上方形成的单元之上。我们在塞尔维亚西部和波斯尼亚东部之间的大片地区研究了这些矿床。在研究区域内,这些矿床根据其年龄、沉积环境和下伏基底类型分为三个岩石地层组。Mokra Gora 群沉积物(上 Aptian-Maastrichtian)沉积在先前被内收和风化的蛇绿岩顶部,Kosjerić 群(Cenomanian-Campanian)覆盖由外收蛇绿岩及其下伏大陆基底部分组成的复合构造单元,而 Guča 群(Campanian –Maastrichtian)仅位于大陆基底顶部。这些组的重建沉积演化,以及与内部 Dinarides(例如 Pogari 组和波斯尼亚复理石)更广泛区域的蛇绿推覆前部的同俯冲和俯冲后沉积物的比较,使我们能够阐明诱导机制,
更新日期:2020-06-15
down
wechat
bug