The Ocean Drilling Program Leg 158 drill holes from the Trans-Atlantic Geotraverse hydrothermal field are investigated to understand rock magnetic signatures of mineralization. A composite columnar section has been constructed through hole correlation stratigraphic variation magnetomineralogy within stockwork. Isothermal remanent magnetization components unmixing, first-order reversal curve dia...

The Aurora volcanic field, located along the northeastern margin of Mono Lake in the Western Great Basin, has erupted a diverse suite of high-K and shoshonitic lava types, with 48 to 76 wt% SiO2, over the last 3.6 million years. There is no correlation between the age and composition of the lavas. Three-quarters of the volcanic field consists of evolved (,4 wt% MgO) basaltic andesite and andesi...

S U M M A R Y Our study of lake sediments from Grandfather Lake in SW Alaska (N59.8181◦, W158.5597◦) yields the first geomagnetic inclination record for Alaska that spans the entire Holocene. The record is based on three overlapping sets of piston cores and is well dated by seven AMS radiocarbon dates. Its magnetic component consists of PSD (5–15μm) magnetite that occurs in concentrations rangi...

Volume-dependent magnetic susceptibility (κ) is commonly used for paleoenvironmental reconstructions in both terrestrial and marine sedimentary environments where it reflects a mixed signal between primary deposition secondary diagenesis. In the environment, κ strongly influenced by abundance of ferrimagnetic minerals regulated sediment transport processes. Post-depositional alteration H2S, how...