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Ophiolite Tectonics, Rock Magnetism and Palaeomagnetism, Cyprus

机译:蛇绿岩构造,岩石磁性和古磁性,塞浦路斯

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摘要

Magnetic properties of minerals may be sensitive indicators of provenance. Remanence-bearing minerals (RBM) such as iron-titanium oxides, and matrix-forming minerals such as paramagnetic phyllosilicate or diamagnetic calcite yield different clues to provenance, strain history and tectonics, and are essential supplements for the full interpretation of palaeomagnetic data. Moreover, mineral magnetic properties provide magnetic-petrofabric indicators of tectonic strain, determine the suitability of sites for palaeomagnetism, and permit the restoration of palaeomagnetic vectors in some strained rocks. In the Cretaceous Troodos ophiolite (similar to 88 Ma) magnetic properties are dictated by the relative importance of mafic silicates and largely primary, ophiolite-derived RBM. In its cover of deformed pelagic sedimentary rock, magnetic properties are dictated by the balance of clastic RBM versus matrix calcite and in some cases clay.
机译:矿物的磁性可能是物源的敏感指标。含铁钛氧化物等含稀土矿物(RBM)和顺磁性层状硅酸盐或抗磁性方解石等基质形成矿物对物源,应变历史和构造产生了不同的线索,是全面解释古磁性数据的重要补充。此外,矿物磁特性提供了构造应变的磁石质指示,确定了古磁性位点的适用性,并允许在某些应变岩石中恢复古磁矢量。在白垩纪Troodos蛇绿岩(类似于88 Ma)中,磁性是由镁铁质硅酸盐和主要由蛇绿岩衍生的RBM的相对重要性所决定的。在变形的上层沉积岩覆盖层中,磁特性是由碎屑RBM与基质方解石以及某些情况下的粘土之间的平衡决定的。

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