Environmental magnetism and magnetostratigraphy of plio-/peistocene sediments of the Heidelberger Becken.

海德堡盆地被认为是新近纪和第四纪北方上莱茵河地堑的主要沉积圈闭。因此，它被认为是一个沉积成就与了解中欧的构造，古地理和古气候演变的关键作用。在过去的项目期间，对海德堡盆地钻取的岩心进行了详细的古地磁和岩石磁学调查，深度达500米。由此产生的普遍河流沉积物一致的磁极性地层为更新世和更年轻的上新世层序提供了第一个独立的年代地层时间框架（Scheidt等人，2015年）。正在进行的岩石磁性分析证明了一个复杂的磁性矿物学变化从铁硫化物为主的铁氢氧化物控制共生。根据我们的工作假设，铁硫化物是在早期成岩过程中形成于主要的河流沉积物中。由同沉积水饱和度触发的减少的间隙环境是根本原因。这些条件从更新世开始一直持续到近代。相反，在干燥条件下的周期性干燥导致了第三纪沉积物的深度二次氧化。在这些条件下，成岩硫化物大量转化为氧化物，碎屑成分发生变化。然而，在更新世，更冷，更潮湿的环境条件与修改水文制度导致不断减少成岩环境。因此，沿着化学缓冲的碳酸盐含量，成岩形成的硫化物的保存是可能的。这一更新建议的重点是描述磁性矿物学清单，验证所述成因模型，并解释岩石磁性作为气候和环境演变的代理。此外，我们设想了一个参考研究的基础上，从温带河流沉积物的岩石磁性调查彻底的磁性矿物学调查。总的来说，我们的目标是全面和详细的岩石磁性分析Plio-/更新世沉积序列位于大陆广泛的相关性的关键位置。

The Heidelberg Basin is considered to be in Neogene and Quaternary times the dominant sediment trap of the northern Upper Rhine Graben. Thus, it is regarded as a sedimentary achieve with a key role for the understanding of the tectonic, palaeogeographic and palaeoclimatic evolution of central Europe. During the past project duration detailed palaeomagnetic and rock magnetic investigations on drill cores from the Heidelberg Basin reaching up to 500 m depth were performed. The resultant consistent magnetic polarity stratigraphy of prevalent fluvial sediments provides the first independent chronostratigraphic time frame for those Pleistocene and younger Pliocene sequences (Scheidt et al. 2015). The ongoing rock magnetic analyses prove a complex magneto-mineralogy varying from iron sulphides dominated to iron-hydroxides controlled paragenesis. According to our working hypothesis iron sulphides are formed in the prevalent fluvial sediments during early diagenetic processes. A reducing interstitial environment triggered by synsedimentary water saturation was the underlying cause. These conditions prevailed from the beginning of the Pleistocene up to recent times. In contrast, periodical desiccation under dryer conditions led to a profound secondary oxidation of the Tertiary deposits. Under these conditions, diagenetic sulphides convert quantitatively to oxides and detrital components alter. During the Pleistocene, however, cooler and more humid environmental conditions associated with a modified hydrologic regime lead to a constant reducing diagenetic milieu. Thus, along with chemically buffering carbonate content a preservation of the diagenetically formed sulphides was possible. The focus of this renewal proposal is on the description of the magneto-mineralogical inventory, on the verification of the described genesis model and on the interpretation of the rock magnetic properties as a proxy for the climatic and environmental evolution. Furthermore, we envisage a reference study for rock magnetic investigations in fluvial sediments from temperate zones based on thorough magneto-mineralogical investigations. On the whole, we aim to a comprehensive and detailed rock magnetic analysis of Plio-/Pleistocene sedimentary successions situated in a key position for continent wide correlations.