Experimental constraints on the magnetic mineralogy of Fe-Ti oxides in basalts from HSDP-2 bore hole

夏威夷科学钻探项目(HSDP)提供了一个极好的机会来研究岩石磁性的演化与屏蔽火山的生长历史和岩浆演化的关系。HSDP-2钻孔中玄武岩的主要岩浆载体是钛磁铁矿和钛铁矿两种铁钛氧化物矿物。本项目的目的是改善高温(岩浆)下这些氧化物的磁性和化学结构特征之间的相关性，重点是钛磁铁矿。新的数据将有助于更好地了解主要构成夏威夷屏蔽层的地下和海底玄武岩的岩石磁性。在第一阶段，我们计划确定高温(1000-1150°C)、成分明确的合成Fe-Ti氧化物的特征磁性参数(例如居里或奈尔温度、磁化率的低温行为、室温和低温磁滞参数)。空位密度)与夏威夷岩石中的空位密度相似。这些新数据将特别适用于从HSDP-2深部发现的海底样本，这些样本没有显示出后期氧化特征。

The Hawaiian Scientific Drilling Project (HSDP) provides an excellent opportunity to study the evolution of rock magnetism in relation to the growth history and magmatic evolution of a shield volcano. The main magmatic carriers in the basaltic rocks drilled from the HSDP-2 bore hole are the two Fe-Ti oxide minerals, titanomagnetite and ilmenite. The aim of the present project is to improve the correlations between magnetic properties and chemical-structural characteristics of these oxides at high (magmatic) temperatures, with an emphasis on titanomagnetite. The new data will contribute to a better understanding of rock magnetic properties of subaerial and submarine basaltic rocks that mainly build up the Hawaiian shield In a first stage we plan to determine characteristic magnetic parameters (e.g. Curie or Néel temperature, low-temperature behavior of the magnetic susceptibility, hysteresis parameters at room and low temperature) of synthetic Fe-Ti oxides equilibrated at high temperatures (1000-1150°C), with well-defined compositions (incl. vacancy concentrations) analogous to those in Hawaiian rocks. These new data will be applied especially to submarine samples recovered from the deep part of HSDP-2 that do not show late oxidation features.