University of Tasmania
Browse

File(s) not publicly available

Source component display and potential field interpretation

journal contribution
posted on 2023-05-16, 10:24 authored by Leaman, DE
2D or 3D gravity and magnetic modelling procedures usually involve comparison of the response from a few, or simple, sources with an observed profile. Common software may also allow complex source distributions typical of a complete geological section. When several sources are involved the observed profile may be the result of complex interference and individual contributions may not be obvious. Gradients may be transformed by such interference. Much trial and error may be required to resolve or understand the source and effect interactions. This is not a simple process if only the resultant calculated from all sources is compared with the reference profile. A source component profile represents the response due to a specific source within a model. Assessment of critical geometry or contrast changes, crucial source segments and curve fitting parameters - and hence model revision, can be greatly accelerated if the actual responses from each part of the model are viewed in addition to the resultant of their effects. Review of the source contributions in a model leads to more satisfactory interpretations since it reveals how the observed profile may, or may not, be composed. Component profiles also demonstrate how observed and resultant gradients may be modified by interference and thus provide some salutory cautions about the use and reliability of simple procedures. Software should be modified to allow this more complex display and a declaration of how the resultant and observed curves were fitted. Most currently available modelling software either generates, stores or requests the required information. The paper includes examples from the Mount Isa Inlier of NW Queensland to illustrate the use of source components. © ASEG 1995.

History

Publication title

Exploration Geophysics

Volume

26

Pagination

221-226

ISSN

0812-3985

Department/School

School of Natural Sciences

Publisher

CSIRO

Place of publication

Melbourne, Australia

Repository Status

  • Restricted

Socio-economic Objectives

Other mineral resources (excl. energy resources) not elsewhere classified

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC