A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench

Wu Mingxian; Patrick J. C. Ryall; Joanne Bryan

doi:10.1007/BF02850434

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A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench

Updated：2023-05-16

- A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench
- Journal of Oceanology and Limnology Vol. 4, Issue 2, Pages: 183-195(1986)
- Affiliations：
  
  1. Shandong College of Oceanology
  2. Department of Geology
- Author bio：
- Funds：
- DOI：10.1007/BF02850434
  CLC：
- Published：1986
- Accepted：
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Mingxian, W., Ryall, P.J.C. & Bryan, J. A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench., Chin. J. Ocean. Limnol. 4, 183–195 (1986). https://doi.org/10.1007/BF02850434
DOI：

Mingxian, W., Ryall, P.J.C. & Bryan, J. A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench., Chin. J. Ocean. Limnol. 4, 183–195 (1986). https://doi.org/10.1007/BF02850434 DOI：

摘要

Abstract

In 1981 a magnetic and bathymetric survey was carried out over Explorer Seamount located approximately between 48°50′ and 49°30′N and 130°40′ and 131°30′W. During the cruise four pillow fragments were dredged from peaks in this area. Based on the observed magnetic data

it was identified that the main peak of Explorer Seamount should be of the Bruhnes age while the magnetic high in the NW of study area would be Gauss. This would yield a spreading rate of about 2 cm per year for the Matuyama epoch. The results of intensities of remanence measured from the pillow fragments indicate that the ages are less than 106 years. Similarly the Curie temperature is consistent with ages of around 106 years. An attempt was made to model the observed magnetic field using a series of uniformly magnetized NE-SW trending blocks of alternating polarity. Agreement between the model and observed results is satisfied. Oxidation ratios calculated from measured samples suggest that the main peak of Explorer Seamount is not far from the present day ridge axis

which agrees with the younger interpretation from the magnetic profiles. The results mentioned above strongly

but not conclusively

favour an interpretation in which the southeastern peak of Explorer Seamount is of the Bruhnes age and the recent spreading is at Explorer trench

then the Sovanco Fracture Zone should be thought of as a complex triangular area between the northern end of Juan de Fuca Ridge and Explorer Seamount rather than as a simple transform fault as defined conventionally.

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references

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Related Author

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