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Changing patterns of shortening and lateral extension, Exhumation of the Eastern Alpine orogenic core, Strain partitioning during orogenic indentation

缩短和侧向延伸的变化模式、东部高山造山核的折返、造山压痕期间的应变分配

基本信息

批准号：
150447119
负责人：
Professor Dr. Mark R. Handy
金额：
--
依托单位：
Institut für Geologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/150447119?language=en
关键词：
Changing patterns shortening lateral extension

项目摘要

We seek to understand how folding and extensional faulting accommodated lateral motion of orogenic crust at the eastern end of the Tauern Window in the Eastern Alps. This is key to determining how Alpine-type mountain belts grow, both vertically and laterally, during plate indentation. We will test the idea that eastward lateral motion of this part of the Alps in response to Miocene-to-present indentation of the Adriatic microplate involved increasing amounts of extensional exhumation from N to S (towards the Adriatic indenter) and that this extensional exhumation was diachronous: Initial activity of the Katschberg mylonite belt during or possibly even before km-scale folding (Hochalm dome) yielded to brittle, high-angle normal faulting (possibly still active?) as folding migrated northwards to the sinistral transpressive SEMP fault that bounds the northeastern part of the Tauern Window. To determine the age, rates and amounts of extensional exhumation, we will lay a series of structural-geochronological transects across and along the Austroalpine-Penninic contact. This will involve Rb/Sr microsampling, Ar/Ar in-situ laser dating and zircon and apatite fission-track campaigns to constrain the entire thermal and kinematic history of doming and orogen-parallel extension. The project requires one research assistant (BATIIa/2) to be employed by the DFG, and funds to support the activites of a second research assistant (Dipl.-Min. Andreas Scharf) already employed by the FU Berlin .

我们试图了解褶皱和伸展断裂如何适应东阿尔卑斯山陶尔窗东端造山壳的横向运动。这是决定阿尔卑斯型山脉带在板块压痕过程中如何垂直和横向生长的关键。我们将检验这样一种观点，即这部分阿尔卑斯山响应于中新世至今的亚得里亚海微板块压痕而向东侧向运动，涉及从北到S(朝向亚得里亚海凹陷)的伸展折返增加的量，并且这种伸展折返是历时的：在公里级褶皱(霍查尔姆穹隆)期间甚至可能之前，卡施伯格糜棱岩带的初始活动屈服于脆性的高角度正断层(可能仍然活动？)随着褶皱向北迁移到环绕陶恩窗口东北部的左旋转进式塞姆普断层。为了确定伸展折返的年龄、速率和数量，我们将在奥斯特罗阿尔卑斯山-宾宁接触上铺设一系列构造-年代学断面。这将包括Rb/Sr显微取样、Ar/Ar原位激光定年以及锆石和磷灰石裂变径迹运动，以限制穹隆和造山带平行伸展的整个热历史和运动学历史。该项目需要一名研究助理(BATIIa/2)受雇于DFG，并需要资金支持第二名研究助理(DPL.-MIN)的活动。安德烈亚斯·沙尔夫)已经受雇于福柏林。