Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies

Details Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000natur.408..827g&link_type=abstract

Nature, Volume 408, Issue 6814, pp. 827-832 (2000).

Computer Science

31

Scientific paper

Knowledge of past variations in the intensity of the Earth's magnetic field provides an important constraint on models of the geodynamo. A record of absolute palaeointensity for the past 50kyr has been compiled from archaeomagnetic and volcanic materials, and relative palaeointensities over the past 800kyr have been obtained from sedimentary sequences. But a long-term record of geomagnetic intensity should also be carried by the thermoremanence of the oceanic crust. Here we show that near-seafloor magnetic anomalies recorded over the southern East Pacific Rise are well correlated with independent estimates of geomagnetic intensity during the past 780kyr. Moreover, the pattern of absolute palaeointensity of seafloor glass samples from the same area agrees with the well-documented dipole intensity pattern for the past 50 kyr. A comparison of palaeointensities derived from seafloor glass samples with global intensity variations thus allows us to estimate the ages of surficial lava flows in this region. The record of geomagnetic intensity preserved in the oceanic crust should provide a higher-time-resolution record of crustal accretion processes at mid-ocean ridges than has previously been obtainable.

Affiliated with

Also associated with

No associations

Rating

Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1054874