Graduate Thesis Or Dissertation

 

A paleomagnetic study of Recent Cascade lavas Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h128nh99x

Descriptions

Attribute NameValues
Creator
Abstract
  • Ninety-five oriented samples were obtained from nine Recent Cascade lava flows in Oregon. Directions and intensities of remanent magnetization were measured on a spinner magnetometer which measures directions of magnetization to within 1.2° s.d. Angle measurements were plotted graphically using an equal area projection. Mean directions and statistics were calculated by digital computer. Samples were demagnetized in alternating magnetic fields while being rotated in a two axis tumbling device. All flow means, except one, calculated from the original magnetization vectors are distinct from the present geomagnetic field direction. A correspondence is found between scatter observed in a flow and the type of outcrop sampled (whether natural or man-made). This is believed to be a consequence of excessive blockiness and aa characteristics of the lavas. Results of demagnetization tests indicate low secondary magnetizations. Stability is indicated by lack of anisotropy, lack of isothermal and chemical remanent magnetizations, low viscous magnetization, and divergence of flow means from the present field direction. Flow mean directions for five dated flows are used to trace the secular variation of the paleomagnetic field back to 3000 B.P. This secular variation curve agrees with data taken in southwestern United States for the same period of time. It has generally been found that Recent mean pole positions are coincident with the geographical pole within the limits of error of the data. This study yielded a mean direction distinct from an axial dipole direction. However, the age span is limited as eight of the nine flows have ages between 300 and 3850 years.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-03-12T20:38:56Z (GMT) No. of bitstreams: 1 McKnightWilliamRoss1968.pdf: 525031 bytes, checksum: 489d58fd9ff031ac061e16d23133e8f5 (MD5)
  • description.provenance : Made available in DSpace on 2012-03-12T20:41:36Z (GMT). No. of bitstreams: 1 McKnightWilliamRoss1968.pdf: 525031 bytes, checksum: 489d58fd9ff031ac061e16d23133e8f5 (MD5) Previous issue date: 1967-07-24
  • description.provenance : Submitted by Joe Nguyen (jnscanner@gmail.com) on 2012-03-10T02:01:59Z No. of bitstreams: 1 McKnightWilliamRoss1968.pdf: 525031 bytes, checksum: 489d58fd9ff031ac061e16d23133e8f5 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-03-12T20:41:36Z (GMT) No. of bitstreams: 1 McKnightWilliamRoss1968.pdf: 525031 bytes, checksum: 489d58fd9ff031ac061e16d23133e8f5 (MD5)

Relationships

Parents:

This work has no parents.

In Collection:

Items