Did the Dinaric Alps force an arid climate and speciation during Miocene Climatic Optimum?

迪纳里克阿尔卑斯山是否在中新世气候最适宜时期造成了干旱气候和物种形成？

• 批准号: 517032148
• 负责人: Professorin Dr. Nevena Tomasevic
• 金额: --
• 依托单位: Institut für Angewandte Geowissenschaften (AGW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/517032148?language=en
• 关键词: Did; Dinaric; Alps; force; arid

Causal links between the rise of large mountain ranges such as the Andes and Himalayas and climate have been demonstrated. There, a significant uplift provokes climate change lead-ing to contrasting depositional environments and fauna speciation across the range. Consider-ing the sedimentary and paleontological records we test the hypothesis that this relationship exists and affects deposition and speciation to a similar degree in the lower mountain ranges such as the Dinaric Alps (Dinarides) in SE Europe. Sedimentological and paleontological data suggest that the topographic uplift of the Dinarides played an important role in the development of the regional contrasting, i.e. arid vs humid conditions and fauna distribution across the Dinarides during the Miocene Climatic Optimum (MCO). However, the analysis of causal relations is greatly hampered by the uncertainty about whether the basins across the mountain range were coeval or not. This uncertainty lies in very poor age constraints of the sedimentary successions in the internal part of the Dinarides. In this study, we will test the hypothesis that the growth of the Dinarides influenced contrasting climatic conditions leading to contrasting depositional environments and fauna speciation in the basins across the Dinarides during the MCO. This hypothesis will be tested by a systematic dating of the basins located in the internal part of the Dinarides using U-Pb dating of tuff layers and carbonate sediments. Furthermore, this will be supported by the revision of the temporal and spatial distribution of fauna across the range. Finally, integration of the new numerical age constraints provided by this work with the existing numerical ages (mostly constrained to the external part of the Dinarides) will allow us an orogen-wide correlation of sedimentary and faunal successions in the isolated basins. The resulting data framework will enable us to precisely assess causal links between the growth of the “small” mountain ranges, such as the Dinarides, the regional climate change, and the adaptive radiation of its biota.

安第斯山脉和喜马拉雅山脉等大型山脉的崛起与气候之间的因果关系已被证明。在那里，显着的抬升引发了气候变化，导致该地区沉积环境和动物物种形成形成鲜明对比。考虑到沉积和古生物学记录，我们检验了这样的假设：这种关系存在，并且在欧洲东南部的迪纳里克阿尔卑斯山（Dinaride）等较低山脉中以类似程度影响沉积和物种形成。沉积学和古生物学数据表明，迪纳里德山脉的地形隆起在中新世气候最适宜期（MCO）期间迪纳里德山脉的干旱与潮湿条件以及动物群分布等区域对比的发展中发挥了重要作用。然而，由于山脉上的盆地是否同时存在的不确定性，极大地阻碍了因果关系的分析。这种不确定性在于迪纳里德斯内部沉积层序的年龄限制非常差。在这项研究中，我们将检验以下假设：迪纳里德斯的生长影响了不同的气候条件，从而导致了 MCO 期间迪纳里德斯盆地中不同的沉积环境和动物物种形成。这一假说将通过使用凝灰岩层和碳酸盐沉积物的 U-Pb 测年法对位于 Dinarides 内部的盆地进行系统测年来检验。此外，该范围内动物群的时间和空间分布的修订也将支持这一点。最后，将这项工作提供的新的数值年龄限制与现有的数值年龄（主要限于迪纳里德斯的外部部分）相结合，将使我们能够在造山带范围内建立孤立盆地沉积和动物群演替的相关性。由此产生的数据框架将使我们能够精确评估“小”山脉（例如迪纳里德山脉）的增长、区域气候变化及其生物群的适应性辐射之间的因果关系。