48 In the Field or in the Lab: Revealing Hidden Signals from Minerals (Posters)

Tuesday, 16 April 2024
1:30 PM - 5:30 PM
Grand Ballroom

VARIATIONS IN THE MAGNETIC MINERALOGY CHARACTERISTICS OF BASALTS IN THE NORTH ATLANTIC OCEAN RIDGE THROUGH IODP EXPEDITION 395/395C

Paper number: 48-1
Program: Theme Sessions
Time: 1:30 PM – 5:30 PM

Authors

Abstract

Describing the nature, amount, timing, and duration of hydrothermal alteration in the Reykjanes Ridge basalts, a crucial area for comprehending mid-ocean ridge processes and is one objective of the International Ocean Discovery Program(IODP) Expeditions 395/395C. This research connects the objective of this expedition with the magnetic properties of the basalts using records from various holes at three distinct sites (U1555 (holes F, G and I), U1563, and U1564F) through a west-to- east transect on the flank of the Mid-Atlantic Ridge.

From these sites, basalt cores spanning 2.8-13.9 Ma in age were successfully recovered by Expedition 395C, providing an extensive dataset for studying hydrothermal alteration processes.

The historical framework provided by basalt ages from Sites U1555 (2.8 Ma), U1563 (5.2 Ma), and U1564 (32.4 Ma) will help to characterize the nature, timing, and progression of hydrothermal alteration during several geological periods. These sites geological settings, which are defined by plume-ridge interaction-generated V-shaped ridges (VSRs, Site U1563) and V-shaped troughs (VSTs, Site U1555), in comparison with Site U1564 off the VSR/VST zone, offers a rare chance to investigate the dynamic interactions between climate, oceanic gateways, and mantle processes. Our research on rock magnetic properties of basaltic materials from these sites intends to constrain relationships between magnetic characteristics, crustal ages and alteration processes. By investigating variations in anisotropy of magnetic susceptibility (AMS), we hope to improve our comprehension of the sea floor basalts thermal history and alteration processes. This research will give an insightful look into the interrelated systems of the processes governing the formation of the North Atlantic Ocean Ridge from a rock magnetic perspective.

Geological Society of America Abstracts with Programs. Vol. 56, No. 2

doi: 10.1130/abs/2024SE-398658

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