In geology tectonostratigraphy refers either to rock sequences in which large-scale layering is caused by the stacking of thrust sheets or nappes in areas of thrust tectonics or the effects of tectonics on lithostratigraphy.

Tectonically formed stratigraphy

One example of such a tectonostratigraphy is the Scandinavian Caledonides [Roberts,D. & Gee,D. 1985. An introduction to the structure of the Scandinavian Caledonides. In Gee, D. G., and Sturt, B. A., eds. The Caledonide Orogen - Scandinavia and related areas.John Wiley and Sons, Chichester, 55-68.] . Within the entire exposed 1800 km length of this orogenic belt the following sequence is recognised from the base upwards:
* Autochthon - undisturbed foreland of the Baltic plate
* Parautochthon - thrust sheets that have moved only a short distance (up to 10s of km) from their original position
* Lower Allochthon - far travelled thrust sheets derived from the Baltic plate passive margin, mainly sediments associated with the break-up of Rodinia
* Middle Allochthon - also derived from the margin of the Baltic plate, Proterozoic basement and its psammitic cover
* Upper Allochthon - thrust sheets including island arc and ophiolitic sequences
* Uppermost Allochthon - thrust sheets containing sediments with fossil assemblages indicating an origin on the margin of the Laurentian plate

This vertically stacked sequence thus represents the passive margins of Baltica and Laurentia and intervening island arcs and back-arc basins telescoped together and emplaced on top of the Baltic Shield, involving 100s of km of shortening.

Within this overall stratigraphy the individual layers have their own tectonostratigraphy of stacked thrust sheets.

Effects of active tectonics on lithostratigraphy

Tectonic events are typically recorded in sediments being deposited at the same time. In the case of a rift, for instance, the sedimentary sequence is normally broken down into three [ [http://findarticles.com/p/articles/mi_qa3721/is_200601/ai_n17171015/pg_1 Jackson, C A L ,Gawthorpe, R L, Leppard, C W , Sharp, I R 2006. Rift-initiation development of normal fault blocks: insights from the Hammam Faraun fault block, Suez Rift, Egypt. Journal of the Geological Society, 163, 165-183] .] :
* Pre-rift - a sequence deposited before the onset of rifting, recognised by the lack of thickness and sedimentary facies changes across the rift faults
* Syn-rift - a sequence deposited during active rifting, typically showing facies and thickness changes across the active faults, unconformities on the fault footwalls may pass laterally into continuous conformable sequences in the hanging walls
* Post-rift - a sequence deposited after the rifting has finished, it may still show thickness and facies changes around the rift faults due to the effects of differential compaction and remnant rift topography, particularly in the earliest part of the sequence

This relatively straightforward nomenclature may become difficult to use, however, in the case of multiphase rifting with the post-rift from one event being the pre-rift to a later event.


ee also

* Chronostratigraphy
* Biostratigraphy

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • tectonostratigraphy — noun The stratigraphy of large scale strata caused by tectonic activity See Also: tectonostratigraphic …   Wiktionary

  • Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century …   Wikipedia

  • Biostratigraphy — is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them. Usually the aim is correlation, demonstrating that a particular horizon in one geological …   Wikipedia

  • Chronostratigraphy — is the branch of stratigraphy that studies the age of rock strata in relation to time. The ultimate aim of chronostratigraphy is to arrange the sequence of deposition and the time of deposition of all rocks within a geological region, and… …   Wikipedia

  • Magnetostratigraphy — is a geophysical correlation technique used to date sedimentary and volcanic sequences. The method works by collecting oriented samples at measured intervals throughout the section. The samples are analyzed to determine their characteristic… …   Wikipedia

  • Dabie Shan — Das Dabie Gebirge bzw. Dabie Shan (大别山; Pinyin: Dàbié Shān) ist ein Mittelgebirge in China, im Grenzgebiet der drei Provinzen Hubei, Henan und Anhui. Inhaltsverzeichnis 1 Lage 2 Geologie 3 Literatur …   Deutsch Wikipedia

  • tectonostratigraphic — adjective Of or pertaining to tectonostratigraphy …   Wiktionary

  • Moldanubian Zone — Most important structures and zones of the Variscan or Hercynian Orogeny in Europe.[1] The Moldanubian Zone is in the regional geology of Europe a tectonic zone formed during the Variscan or Hercynian Orogeny (400 to 300 million ye …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”