The study of magnetic anomalies over Davis Strait

Wu Mingxian

doi:10.1007/BF02850397

Your Location：

Home >

Browse articles >

The study of magnetic anomalies over Davis Strait

OriginalPaper | Updated：2023-05-16

- The study of magnetic anomalies over Davis Strait
- The study of magnetic anomalies over Davis Strait
- 海洋湖沼学报（英文） 1986年4卷第1期页码：56-67
- Affiliations：
  
  Department of Marine Geology Shandong College of Oceanology
- Author bio：
- Funds：
  
  This work was carried out at Department of Geology and Centre for Marine Geology, Dalhousie University, Halifax, N. S. Canada.
- DOI：10.1007/BF02850397
  中图分类号：
- 纸质出版：1986
- Accepted：
Scan QR Code
The study of magnetic anomalies over Davis Strait[J]. 海洋湖沼学报（英文）, 1986,4(1):56-67.

Mingxian, W. The study of magnetic anomalies over Davis Strait., Chin. J. Ocean. Limnol. 4, 56–67 (1986). https://doi.org/10.1007/BF02850397
The study of magnetic anomalies over Davis Strait[J]. 海洋湖沼学报（英文）, 1986,4(1):56-67. DOI： 10.1007/BF02850397.

Mingxian, W. The study of magnetic anomalies over Davis Strait., Chin. J. Ocean. Limnol. 4, 56–67 (1986). https://doi.org/10.1007/BF02850397 DOI：

摘要

Abstract

Magnetic data collected during several cruises in Davis Strait show north-south lineations over most of the area. The central positive magnetic zone coincides well with a major gravity low. These results suggest that the magnetic anomalies were produced by seafloor spreading and that the gravity low marks an extinct spreading center in Davis Strait. Comparison between the geomagnetic polarity time-scale and dated anomalies in Labrador Sea suggests identification of anomalies 13–27 (37 to 62 MY). In southern Davis Strait (63°N)

the spreading rates are 8.4 mm/y. east of the spreading center

and 2.7 mm/y to the west. In northern Davis Strait (66°N)

the spreading rates are 4.5 mm/y east of the spreading center

and 2.1 mm/y to the west. Seafloor spreading in Davis Strait was there-fore very asymmetrical

with decreasing rates from south to north. Spreading is interpreted as having begun at 61–63 M and ending at 37 MY. Three fracture zones have been delineated

suggesting oblique spreading about the ridge axis in the Davis Strait. A distinct northeast-southwest anomaly zone is interpreted as the

expression of faults caused by volcanically-induced vertical crustal movements

and not by spreading-related horizontal crustal movement. Faulting along this northeast-southwest anomaly zone is inferred to have occurred after the spreading and before 30 MY. The magnetic anomalies off Cape Dyer are proposed to be different from the anomalies striking in northeast-southwest direction. The Cape Dyer anomaly is interpreted as being formed at 58 MY while the northeast-southwest anomaly zone formed more recently.

关键词

Keywords

references

Clarke, D. B and Upton, B. G. 1971. Tertiary basalts of Baffin Island: field relations and tectonic setting.Can. J. Earth Sci. 8: 248–258.

Drake, C., Campbell, N. J., Sander, G. and Nafe, J. E. 1963. A mid-Labrador Sea Ridge.Nature 200: 1085.

Godby, E. A., Baker, R. C., Bower, M. E. and Hood, P. J. 1966. Aeromagnetic reconnaissance of the Labrador Sea.Journal of Geophysical Research 71: 511–517.

Grant, A. C. 1975a. Structural modes of the western margin of the Labrador Sea.In: Offshore Geology of Eastern Canaca. Edited by W. J. M. van der Linden and J. A. Wade. Geological Survey of Canada, Paper. 74 30. pp. 217–232.

Grant, A. C. 1975b. Geophysical Results from the continental margin off southern Baffin Island.In: Canada's continental margins and offshore petroleum exploration. Edited by C. J. Yorath, E. R. Parker, and D. J. Glass.Canadian Society of Petroleum Geologists, Memoir 4: 411–431.

Grant, A. C. 1980. Problems with Plate Tectonics: Labrador Sea.Bulletin of Canadian Petroleum Geology 28: 252–278.

Grant, A. C. 1982. Problems with plate tectonic models for Baffin Bay-Nares Strait: evidence from the Labrador Sea.Geoscience 8: 313–326.

Harland, W. B., Cox, A. V., Llewellyn, P. G., Pickton, C. A. G., Smith, A. G., and Walters, R. 1982. A geologic time scale. Cambridge Earth Science Series. Cambridge University Press. pp. 63–84.

Holtedahl, O. 1950. Supposed marginal fault lines in the shelf areas off some high northern lands.Geological Society of America Bulletin 61: 493–500.

Hood, P. J. and Bower, M. E. 1970. Aeromagnetic profile from Cape Cargenholm, Baffin Island to Red Head, West Greenland. Geological Survey of Canada, Paper 70-1, pt. B, pp. 37–39.

Jackson, H. R., Keen, C. E., Falconer, R. K. H. and Appleton, K. P. 1979. New geophysical evidence for sea-floor spreading in central Baffin Bay.Canadian Journal of Earth Sciences 11: 2122–2135.

Johnson, G. L., Closuit, A. W. and Pew, J. A. 1969. Geologic and geophysical observations in the northern Labrador Sea.Arctic 22: 56–68.

Johnson, G. L., Egloff, J., Campsie, J., Rasmussen, M., Dittmer, F. and Freitag, J. 1973. Sediment distribution and crustal structure of the southern Labrador Sea.Geological Society of Denmark Bulletin 22: 7–24.

Keen, C. E., Barrett, D. L., Manchester, K. S. and Ross, D. I. 1972. Geophysical Studies in Baffin Bay and some tectonic implications.Canadian Journal of Earth Sciences 9: 239–256.

Keen, M. J. and Clarke, D. B. 1974. Tertiary basalts of Baffin Bay: Geochemical evidence for a fossil hot spot.In: Geodynamics of Iceland and the North Atlantic Area. Edited by L. Kristjansson, D. Reidal (Dordrecht-Holland) Publishers, pp. 127–137.

Keen, M. J., Johnson, J. and Park, I. 1972. Geophysical and geological studies in Eastern and northern Baffin Bay and Lancaster Sound.Canadian Journal of Earth Sciences 9: 689–708.

Kerr, J. Wm. 1967. A submerged continental remnant beneath the Labrador Sea.Earth and Planetary Science Letters 2: 283–289.

Kristoffersen, Y. and Talwani, M. 1977. Extinct triple junction south of Greenland and the Tertiary motion of Greenland relative to North America.Geological Society of America Bulletin 88: 1037–1049.

Laughton, A. S. 1971. South Labrador Sea and the evolution of the North Atlantic.Nature 232: 612–617.

Laughton, A. S. 1972. The southern Labrador Sea—key to the Mesozoic and early Tertiary evolution of the north Atlantic.In: Initial Reports of the Deep Sea Drilling Project, Washington (U. S. Government Printing Office),12, pp. 1155–1179.

Le Pichon, X., Hyndman, R., and Pautot, G., 1971. Geophysical study of the opening of the Labrador Sea.Journal of Geophysical Research 76: 4724–4743.

MacLean, B., Falconer, R. K. H. and Clarke, D. B. 1978. Tertiary basalts of western Davis Strait; bedrock core samples and geophysical data.Canadian Journal of Earth Sciences 15: 773–780.

Mayhew, M. A., Drake, C. L. and Nafe, J. E. 1970. Marine geophysical measurements on the continental margins of the Labrador Sea.Canadian Journal of Earth Sciences 7: 199–214.

Meyerhoff, A. A. 1973. Origin of Arctic and North Atlantic Oceans.In: Arctic Geology. Edited by M. G. Pritcher.American Association of Petroleum Geologists, Memoir 19: 562–682.

Shih, K. G., Keen, C. E., Johnson, B. L., jackson, W. R. and Keen, M. J. 1978. Geophysical data collected in the northwestern Atlantic Ocean. Report of cruise 73-011. CSS Hudson. Bedford Institute of Oceanography, Dartmouth, N. S.. Data Series BI-D-78-6.

Shih, K. G., Doherty, F. and Macnab, R. 1983. A fast polynomial approximation of the international geomagnetic reference fields. Scientific and Technical Notes in Current Research, Part A; Geol. Surv-Can., Paper 83-1A.

Srivastava, S. P. 1978. Evolution of the Labrador Sea and its bearing on the early evolution of the North Atlantic Royal Astronomical Society.Geophysical Journal 52: 313–357

Srivastava, S. P., Falconer, R. K. H. and Maclean, B. 1981. Labrador Sea, Davis Strait, Baffin Bay-Geology and Geophysics—a review.In: J. Wm. Kerr and A. J. Ferguson, eds., Geology of the North Atlantic borderlands.Canadian Society of Petroleum Geologists. Memoir 7: 333–398.

Srivastava, S. P., 1983. Davis Strait. Structure, origin and evolution.In: S. Saxov, M. H. P. Bott, and M. Talwani, eds., The structure and development of the Greenland-Scotland Ridge—new methods and concepts. Plenum Publishing Corporation, New York, pp. 159–189.

Srivastava, S. P., MacLean, B., MacNab, R. F. and Jackson, H. R. 1982. Davis Strait: structure and evolution as observed from a systematic geophysical survey. Arctic Geology and Geophysics. Edited by A. F. Embry and H. R. Balkwill.Canadian Society of Petroleum Geologists, Memoir 8: 267–278.

Umpleby, D. C. 1979. Geology of the Labrador Shelf. Geological Survey of Canada. Paper 79-13.

van der Linden, W. J. M. 1975a. Mesozoic and Cainozoic opening of the Labrador Sea, the North Atlantic and the Bay of Biscay.Nature 253: 320–324.

van der Linden, W. J. M. 1975b. Crustal attenuation and sea-floor spreading in the Labrador Sea.Earth and Planetary Science Letters 27: 409–423.

Van der Linden, W. J. M. and Srivastava, S. P. 1975. The crustal structure of the continental margin off central Labrador. Geological Survey of Canada, Paper 74.30,2: 233–241.

Vogt, P. R. and Avery, O. E. 1974. Detailed magnetic surveys in the Northeast Atlantic and Labrados Sea.Journal of Geophysical Research 79: 363–389.

浏览量

Downloads

CSCD

文章被引用时，请邮件提醒。

Submit

工具集

关联资源

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

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

高压涡轮封严流与主流相互作用的机理研究