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

海德堡盆地被认为是上莱茵地堑北部新近纪和第四纪的主要沉积圈闭。因此，它被认为是一项沉积成就，对了解中欧的构造、古地理和古气候演化具有关键作用。在过去的项目期间，对海德堡盆地钻探岩心进行了详细的古地磁和岩石磁调查，深度可达500 m。由此产生的普遍河流沉积物的一致磁极性地层学为更新世和更年轻的上新世序列提供了第一个独立的年代地层时间框架（Scheidt et al. 2015）。正在进行的岩石磁性分析证明了一个复杂的磁矿物学变化，从硫化铁主导到铁氢氧化物控制的共生。根据我们的工作假设，硫化铁是在早期成岩作用中形成的。同沉积含水饱和引发的还原性间隙环境是其根本原因。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第三系沉积物的深度二次氧化。在这种条件下，成岩硫化物定量地转化为氧化物，碎屑成分发生变化。然而，在更新世期间，与改变的水文制度相关的更凉爽和更潮湿的环境条件导致了不断减少的成岩环境。因此，与化学缓冲碳酸盐含量一起，成岩形成的硫化物的保存是可能的。这项更新建议的重点是对磁矿物清单的描述，对所描述的成因模型的验证，以及对作为气候和环境演化代理的岩石磁性特性的解释。此外，我们设想在彻底的磁矿物学调查的基础上，对温带河流沉积物的岩石磁调查进行参考研究。总的来说，我们的目标是对位于全大陆对比关键位置的上新世/更新世沉积序列进行全面详细的岩石磁分析。

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.