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

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

doi:10.1007/BF02850434

Your Location：

Home >

Browse articles >

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

OriginalPaper | Updated：2023-05-16

- A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench
- A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench
- 海洋湖沼学报（英文） 1986年4卷第2期页码：183-195
- Affiliations：
  
  1. Shandong College of Oceanology
  2. Department of Geology
- Author bio：
- Funds：
- DOI：10.1007/BF02850434
  中图分类号：
- 纸质出版：1986
- Accepted：
Scan QR Code
A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench[J]. 海洋湖沼学报（英文）, 1986,4(2):183-195.

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
A magnetic survey of Explorer Seamount— Recent spreading at the Explorer trench[J]. 海洋湖沼学报（英文）, 1986,4(2):183-195. DOI： 10.1007/BF02850434.

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.

关键词

Keywords

references

Barr, S.M. and Chase, R.L., 1974. Geology of the nothern end of Juan de Fuca Ridge and sea-flooor spreadingCan. J. Earth Sci. 11: 1384–1406.

Chase, R.L., Johnson, H.P. and Ryall, P.J.C., 1982. Geology of Explorer Seamount, N.E. Pacific.EOS (Trans. Am Geophys. Un.) 63: 1154.

Irving, E., 1970. The Mid-Atlantic Ridge at 45°N. XIV. Oxidation and magnetic, properties of basalt; review and discussion.Can. J. Earth Sci. 7: 1528–1538.

Johnson, H.P., 1978. Paleomagnetism of igneous rock samples—DSDP Leg 45.In Melsom, W.G., Rabinovitz, P.D., et al. Initial Reports of the Deep Sea Drilling Project, XLV, Washington (U.S. Govt. Ptg. Off.).

Hyndman, R.D., Riddihough, R.P. and Zerger, R., 1979. The Nootka Fault Zone—a boundary off western Canada.Geophys. J. Roy. Astron. Soc. 58: 667–683.

Keen, C.E. and Hyndman, R.D., 1979. Geophysical review of the continental margins of eastern and western Canada.Can. J. Earth Sci. 16: 712–747.

Malecek, S.J. and Clowes, R.M., 1978. Crustal structure near Explorer Ridge from a marine deep seismic sounding surveyJ. Geophys. Res. 83: 5899–5912.

Marshall, M. and Cox, A., 1972. Magnetic changes in pillow basalt due to seafloor weathering.J. Geophys. Res. 77: 6459–6469.

McManus, D.A., Holmes, M.L., Carson, B. and Bass, S.M., 1972. Late Quaternary tectonics, northern end of Juan de Fuca Ridge (northeast Pacific).Mar. Geol. 12: 141–164.

Milne, W.G., Rogers, G.C., Riddihough, R.P., McMechan, G.A. and Hyndman, R.D. 1978. Seismicity of western Canada.Can. J. Earth Sci. 15: 1170–1193.

Morgan, W.J. and Loomis, T.P., 1971. Correlation coefficients and sea-floor spreading and automated analysis of magnetic profiles.Mar. Geol. Res. 1: 248–260.

Pavoni, N., 1966. Tectonic interpretation of the magnetic anomalies southwest of Vancouver Island.Pure Appl. Geophys. 63: 172–177.

Raff, A.D. and Mason, R.G., 1961. Magnetic survey off the west coast of North America, 40°N to 52°N.Geol. Soc. Amer. Bull. 72: 1267–1270.

Riddihough, R.P., 1977. A model for recent plate interactions off Canada’s west coast.Can. J. Earth Sci. 14: 384–396.

Ryall, P.J.C. and Ade-Hall, J.M., 1975. Radical variation of magnetic properties in submarine pillow basalt.Can. J. Earth Sci 12: 1959–1969.

Ryall, P.J.C., Hall, J.M., Clark, J. and Milligan, T., 1977. Magnetization of oceanic crustal layer 2—results and throughts after DSDP Leg 37.Can. J. Earth Sci. 14: 684–706.

Van Wagoner, N.A. and Johnson, H.P., 1983. Magnetic properties of three segments of the Mid-Atlantic Ridge at 37° N famous, Narrowgate and Amar: Amar 2.Jour., Geophys. Res. 88: 5065–5082.

Vine, F.J., 1966. Spreading of the ocean floor: new evidence.Science. 154: 1405–1415.

Vine, F.J. and McNab, R., 1967. A program for fitting the magnetic effect of a three dimensional structure to an observed anomaly by calculating the required magnetization vector. BIO Computer Note 67-7-C. Dartmouth, Can.

Telford, W.M., Geldart, L.P., Sheriff, R.E. and Keys, D.A., 1976. Applied Geophysics. Cambridge University Press, Cambridge, 860 pp.

Wu, M. and Ryall, P.J.C., 1982. A magnetic study of Explorer Seamount.EOS (Trans. Am. Geophys. Un.) 63: 1154.

浏览量

Downloads

CSCD

文章被引用时，请邮件提醒。

Submit

工具集

关联资源

The study of magnetic anomalies over Davis Strait

An application of marine geomagnetic survey to shallow sea engineering geology

Characteristics of magnetic anomalies over transform faults and interpretation of magnetic anomalies in the Davis Strait

基于最大似然估计的点火概率曲线计算模型取点方法

基于半经验模型的霍尔推力器壁面腐蚀形貌预测方法研究