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Monocline

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Monocline

block diagram of a monocline

The Grandview-Phantom Monocline in the Grand Canyon, Arizona

Monocline formed at tip of small thrust fault, Brims Ness, Caithness, Scotland

A monocline (or, rarely, a monoform) is a step-like fold in rock strata consisting of a zone of steeper dip within an otherwise horizontal or gently-dipping sequence.

Formation

Possible modes of formation of monoclines

Monoclines may be formed in several different ways (see diagram)

  • By differential compaction over an underlying structure, particularly a large fault at the edge of a basin due to the greater compactibility of the basin fill, the amplitude of the fold will die out gradually upwards.[1]
  • By mild reactivation of an earlier extensional fault during a phase of inversion causing folding in the overlying sequence.[2]
  • As a form of fault propagation fold during upward propagation of an extensional fault in basement into an overlying cover sequence.[3]
  • As a form of fault propagation fold during upward propagation of a reverse fault in basement into an overlying cover sequence.[4]

Examples

See also

References

  1. ^ Skuce, A.G. (1996). "Forward modelling of compaction above normal faults: an example from the Sirte Basin, Libya". In Buchanan,P.G. and Nieuwland,D.A.. Modern Developments in Structural Interpretation, Validation and Modelling. Special Publications. 99. London: Geological Society. pp. 135–146. ISBN 9781897799437. http://s-s-consulting.com/pdf_articles/geol%20soc%201996.pdf.
  2. ^ Chadwick, R.A. (1993). "Aspects of basin inversion in southern Britain". Journal of the Geological Society 150: 311-322. doi:10.1144/gsjgs.150.2.0311. http://jgs.lyellcollection.org/cgi/content/abstract/150/2/311?ijkey=075ea7d0d92cd14125f610d8bc8feed0be8fb091&keytype2=tf_ipsecsha.
  3. ^ Willsey, S.P.; Umhoefer,P.J. and Hilley,G.E. (2002). "Early evolution of an extensional monocline by a propagating normal fault: 3D analysis from combined field study and numerical modeling". Journal of Structural Geology 24: 651-669. doi:10.1016/S0191-8141(01)00120-1. http://earthsciences.stanford.edu/research/geomech/Software/publications/Willsey_JSG_2002.pdf.
  4. ^ Finch, E.; Hardy,S. and Gawthorpe,R. (2003). "Discrete element modelling of contractional fault-propagation folding above rigid basement fault blocks". Journal of Structural Geology 25: 515-528.. doi:10.1016/S0191-8141(02)00053-6. http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V9D-45XR8BC-4&_user=10&_coverDate=04%2F30%2F2003&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1601106920&_rerunOrigin=scholar.google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=bdbd1bcb3c66f603cb8a41c0771bd602&searchtype=a.

External links

http://bio-geo-terms.blogspot.com/2006_12_01_bio-geo-terms_archive.html

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Look at other dictionaries:

  • Monocline — Mon o*cline, n. (Geol.) A monoclinal fold. [1913 Webster] …   The Collaborative International Dictionary of English

  • monocline — [män′ō klīn΄, män′əklīn΄] n. [< MONO + Gr klinein, to incline: see LEAN1] a monoclinal rock fold or structure …   English World dictionary

  • monocline — (mo no kli n ) adj. Terme de botanique. Plante monocline, dite aussi hermaphrodite, plante qui est pourvue des deux sexes dans une même fleur. ÉTYMOLOGIE    Mono..., et terme grec signifiant lit …   Dictionnaire de la Langue Française d'Émile Littré

  • monocline — noun Date: 1879 an oblique geologic fold …   New Collegiate Dictionary

  • monocline — /mon euh kluyn /, n. Geol. a monoclinal structure or fold. [1875 80; back formation from MONOCLINAL] * * * …   Universalium

  • monocline — noun a) A unidirectional dip in strata that is not a part of an anticline or syncline b) A single flexure in otherwise flat lying strata …   Wiktionary

  • monocline —     a) [ landform ]    A unit of folded strata that dips from the horizontal in one direction only, is not part of an anticline or syncline, and occurs at the earth’s surface. This structure is typically present in plateau areas where nearly flat …   Glossary of landform and geologic terms

  • monocline — n. (Geology) rock formation in which the strata slopes in only one direction …   English contemporary dictionary

  • monocline — [ mɒnə(ʊ)klʌɪn] noun Geology a bend in rock strata that are otherwise uniformly dipping or horizontal. Derivatives monoclinal adjective Origin C19: from mono + Gk klinein to lean …   English new terms dictionary

  • monocline — mono·cline …   English syllables