By Kenneth P. Kodama
This publication describes the paleomagnetism of sediments and sedimentary rocks, how sediments and sedimentary rocks develop into magnetized, and the way the actual and chemical tactics concerned can have an effect on the accuracy of paleomagnetism.
Topics lined comprise depositional and post-depositional remanence acquisition, the detection and correction of compaction-caused inclination shallowing, aid diagenesis of magnetic minerals, chemical remagnetization, and rotation of remanence through grain-scale rock pressure. The publication additionally has a bankruptcy on environmental paleomagnetism, together with examples of the hot means of high-resolution rock magnetic cyclostratigraphy and its software to sedimentary sequences.
By emphasising the accuracy of sedimentary paleomagnetism and the value of post-depositional tactics which may have an effect on it, the ebook may be precious within the geologic interpretation of sedimentary paleomagnetic data.
Paleomagnetism of Sedimentary Rocks could be welcomed by way of paleomagnetists, scholars of paleomagnetism and all Earth scientists who use sedimentary paleomagnetic information of their research.
Additional assets for this ebook are available at: www.wiley.com/go/kodama/paleomagnetism.
Chapter 1 The Paleomagnetism of Sediments and Sedimentary Rocks: significance and Reliability (pages 1–15):
Chapter 2 The Magnetization Mechanism of Sediments and Sedimentary Rocks: Depositional Remanent Magnetization (pages 16–25):
Chapter three Post?Depositional Remanent Magnetization (pages 26–33):
Chapter four Inclination Shallowing in Sedimentary Rocks: facts, Mechanism and reason (pages 34–45):
Chapter five find out how to notice and proper a Compaction?Shallowed Inclination (pages 46–65):
Chapter 6 Post?Depositional Diagenesis and Chemical Remanent Magnetization (pages 66–80):
Chapter 7 Tectonic pressure results on Remanence: Rotation of Remanence and Remagnetization in Orogenic Belts (pages 81–93):
Chapter eight Magnetization of Sediments and the surroundings (pages 94–123):
Chapter nine The Magnetization of Sedimentary Rocks: strategies and their Interpretation (pages 124–135):
Read or Download Paleomagnetism of Sedimentary Rocks: Process and Interpretation PDF
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Additional info for Paleomagnetism of Sedimentary Rocks: Process and Interpretation
Coarse-grained sediments are less likely 24 Chapter 2 to have this ability, particularly if the sediment accumulation rate is high. Fine-grained sediments can more easily acquire an accurate post-depositional remanence, but they are particularly susceptible to compaction-caused inclination shallowing while coarse sediments are not. It turns out that both coarsegrained and ﬁne-grained hematite-bearing sedimentary rocks will likely have inclination shallowing, but they will acquire the shallowing at different times (either at or after deposition).
Therefore, accurate red bed directions will probably not have their age well known, and accurately dated red bed magnetization ages will probably not be an accurate record of the Earth’s ﬁeld direction at the time of deposition. POST-DEPOSITIONAL PROCESSES THAT AFFECT THE MAGNETIZATION OF SEDIMENTS AND SEDIMENTARY ROCKS Even though it’s quite clear that the DRM acquired by recent sediments is reproducible when multiple coeval records are compared, this still begs the question of how accurately the DRM records the Earth’s magnetic ﬁeld.
Other evidence used to argue for a DRM in red beds came during the heyday of the red bed controversy from the measurement of red bed paleomagnetism on the topset, bottomset and foreset beds of crossbedding (Steiner 1983). A difference in the inclination carried by the ﬂat-lying bottomset or topset beds and the initially dipping foreset beds would suggest a DRM affected by an initial bedding slope by magnetic grains rolling down the slope. Another powerful argument that the magnetization of red beds is primary (and therefore a DRM) comes from the observation that many red beds record a magnetostratigraphy, in which geomagnetic ﬁeld polarities are constrained to stratigraphic horizons.