Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.108...93l&link_type=abstract
Earth and Planetary Science Letters, Volume 108, Issue 1-3, p. 93-107.
Other
1
Scientific paper
The rock magnetic variability of surficial marine sediments from the California continental borderland adjacent to southern California is described. The data were derived from measurement of the natural (NRM), anhysteretic (ARM), and isothermal (IRM) remanent magnetization and magnetic susceptibility of 385 samples from 230 box cores. Magnetic mineralogy studies carried out on selected samples indicate that detrital magnetite predominates throughout the borderland, but there are also locally important contributions from detrital and authigenic hematite, altered glauconite, and biogenic magnetite. Maps of the distributions of various rock magnetic parameters show that: (1) the proportion of magnetic material decreases outward from the coastline through dilution by organic material and carbonate, (2) the magnetic grain size distribution shifts to finer average grain size outward from the coastline, (3) important local contributions to the sediment magnetic material can come from erosion of submerged bank tops or ridges, (4) glauconite-rich zones on bank tops can be altered to remanent magnetic material that is anomalously strong in intensity and coercivity, and (5) that diagenetic processes occur ubiquitously within the deep basins causing large scale dissolution of the magnetic material. Comparisons of ARM, χ, and SIRM (saturation IRM) indicate that ARM/χ is very sensitive to grain-size changes and that both the quantity (ARM2 + χ2)0.5 and SIRM are good indicators of volume of remanent magnetic material in the borderland.
Gorsline Donn S.
Henyey Tom L.
Lund Steve P.
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