Use this URL to cite or link to this record in EThOS: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.470579 |
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Title: | Geophysical investigation into the evolution of bransfield strait. | ||||
Author: | Roach, P. J. |
ISNI:
0000 0001 3520 4853
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Awarding Body: | University of Birmingham | ||||
Current Institution: | University of Birmingham | ||||
Date of Award: | 1978 | ||||
Availability of Full Text: |
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Abstract: | |||||
The results of an extensive literature survey of previous geological and
geophysical research into the south-vest Scotia Sea are presented. Techniques
used in the data processing of over 80 marine magnetic traverses
steamed between 1964 and the present day in the Bransfield Strait area are
described. Qualitative interpretations of the bathymetry, the regional
magnetic field and two seismic reflection profiles are presented. Fourteen
magnetic anomaly profiles have been modelled in order to determine
the nature of the evolution of this area, while two graYity models are
presented as confirmation of the crustal structure of Bransfield Strait.
The results from the magnetic modelling indicate that stripes of normal
and reversed polarity cruet exist in Bransfield Trough. It is likely that
this crust has been generated by a process of sea-floor spreading during
normal and reversed epochs of the Earth's magnetic field. Although the
width of generated crust in the trough varies, an average of 32 km has
been produced over the last 1.3 m.y. at a mean spreading rate of
24 mm yr -1. A line of seamounts represent a spreading centre which may be
offset by five transform faults. Sea-floor spreading here appears to be
disordered, and intermittent ridge activity during extension reflects the
immaturity of the system. Volcanic and earthquake evidence indicate that
Bransfield Strait is still actively undergoing extension at the present
day.
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Supervisor: | Not available | Sponsor: | Not available | ||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||
EThOS ID: | uk.bl.ethos.470579 | DOI: | Not available | ||
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