Geomagnetic Field Variations in the Past: New Data, Applications and Recent Advances
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In the last decades, palaeomagnetic research has provided important information about the past variation of the Earth's magnetic field (EMF) from its origin to the present day. However, questions regarding the origin and evolution of the EMF as well as the frequency and spatial distribution of its variations still remain open to debate. This Special Publication provides new insights into the study of the temporal and spatial evolution of the EMF presenting new data from palaeomagnetic and rock magnetic studies of archaeological materials, sediments and lavas. The papers presented cover a wide range of topics related to archaeology, stratigraphy and climate, including new data from several parts of the world, such as Europe, Africa, Australia, New Zealand, India and the Baltic Sea. This Special Publication aims to present an overview of the most recent secular variation studies and their use to disclose fundamental properties of the EMF evolution.
Integrated high-resolution PSV, RPI and 14C study of IODP-347 Site M0060 (Anholt Loch, Baltic Sea) for the last c. 14 ka
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Published:September 23, 2020
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CiteCitation
Emilio Herrero-Bervera, Ian Snowball, 2020. "Integrated high-resolution PSV, RPI and 14C study of IODP-347 Site M0060 (Anholt Loch, Baltic Sea) for the last c. 14 ka", Geomagnetic Field Variations in the Past: New Data, Applications and Recent Advances, E. Tema, A. Di Chiara, E. Herrero-Bervera
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Abstract
We have studied the rock and palaeomagnetic properties and 14C dating of a c. 205 m core from Site M0060 (Anholt Loch, BSB1 at Kattegat), recovering clays, (silty) sands and sandy clays. We took 297 8 cc samples at c. 50 cm intervals down-core. χ was measured along with AF demagnetization of the NRM up to 80 mT. ChRM was isolated between 0 and 25 mT. A weak VRM was removed at 5 mT. The intensity shows a positive relationship with χ. At Site M0060 the upper lithologic units (i.e. 0–100 mcd) show inclinations that vary within 10° on either side of the GAD prediction (i.e. +72°). Curie points indicate minerals with temperatures of 360–400, 520, 575 and 610°C. We obtained calibrated 14C determinations for 15 levels, with the oldest age from 78.87 mbsf to c. 17 940 cal BP. The J, inclination, χ, ARM, SIRM, SIRM/χ and ARM/χ palaeomagnetic (i.e. inclination) wave forms results from the top c. 100 mcd correlate well to the deglacial inclination wave forms master curve for Fennoscandia. The best correlation to this curve shows four oscillations of the inclination record of Site M0060 from 11 to 14 ka BP. Shallow negative inclinations are characteristic of the deeper coarse-grained sediments deposited during the rapid wasting of the Fennoscandian ice-sheet.
- absolute age
- Atlantic Ocean
- Baltic Sea
- C-14
- carbon
- Cenozoic
- Curie point
- demagnetization
- electron microscopy data
- Europe
- Expedition 347
- experimental studies
- Fennoscandia
- glacial geology
- high-resolution methods
- ice sheets
- induced magnetization
- Integrated Ocean Drilling Program
- IODP Site M0060
- isotopes
- Kattegat
- magnetic inclination
- magnetic intensity
- magnetic properties
- magnetic susceptibility
- magnetization
- magnetostratigraphy
- natural remanent magnetization
- North Atlantic
- North Sea
- paleomagnetism
- Quaternary
- radioactive isotopes
- remanent magnetization
- secular variations
- sedimentation
- sedimentation rates
- TEM data
- viscous remanent magnetization
- Anholt Loch