Emplacement conditions of pyroclastic deposits inferred from magnetic properties of the Eger maar-diatreme (ICDP-EGER drill site S4) and Eifel volcanoes

不同火山碎屑喷发序列的磁性矿物学大多是复杂的，并提供了一个补充工具，古地磁定向分析的侵位温度估计，并可能有助于火山物质的历史和侵位条件的信息。该项目的目的是调查磁性矿物学是否适合于从中欧第四纪火山区不同分馏的碱性岩浆岩的火山碎屑沉积物中分离不同的喷发序列。我们将研究两个ICDP-埃格裂谷钻探S4 a/S4 b和火山艾弗尔的第四纪喷发火山序列的岩石磁性和特征磁性矿物学，以比较不同的火山结构及其侵位条件。我们将测试，如果居里温度的钛磁铁矿和它的（非）可逆性，使用温度依赖性的同相和异相磁化率是适合解开尚未探索的内在磁性和结构性质的钛磁铁矿，这是新的火山岩的磁性矿物学研究。我们将结合联合收割机岩石磁性，磁性矿物学和古地磁调查与矿物化学，高分辨率透射电子显微镜结合电子能量损失光谱和拉曼光谱，以获得更根本的理解的不可逆性的居里温度在钛磁铁矿。

Magneto-mineralogy from different pyroclastic eruptive sequences is mostly complex and offers a complementary tool to paleomagnetic directional analysis for emplacement temperature estimates and may contribute information on the volcanic material history and their emplacement conditions. The aim of this project is to investigate if magnetic mineralogy is suited to separate different eruptive sequences from pyroclastic deposits of differently fractionated alkaline magmatic rocks in the Quaternary volcanic provinces in Central Europe. We will investigate the rock magnetic properties and characteristic magnetic mineralogy of the two ICDP-Eger Rift Drillings S4a/S4b and well-described Quaternary eruptive volcanic sequences from the Volcano Eifel to compare different volcanic structures and their emplacement conditions. We will test if Curie temperature of titanomagnetite and its (non-) reversibility using the temperature-dependence of in- and out-of-phase magnetic susceptibility is suited to unravel not yet explored intrinsic magnetic and structural properties in titanomagnetite, which is new for magneto-mineralogical studies in volcanic rocks. We will combine rock magnetic, magneto-mineralogical and paleomagnetic investigations with mineral chemical, high-resolution transmission electron microscopy in combination with electron energy-loss spectroscopy and Raman spectroscopy in order to get a more fundamental understanding of the non-reversibility of Curie temperatures in titanomagnetite.