Encyclopedia of Geobiology

2011 Edition
| Editors: Joachim Reitner, Volker Thiel

Shales

  • Jürgen Schieber
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-9212-1_182

Definition

Historically, the term shale has been used to describe fine-grained sedimentary rocks of largely terrigenous derivation, dominated by mud-size particles (0.06 mm and smaller) and containing appreciable quantities (several 10%) of clay minerals . The definition of the term has been a subject of debate (Potter et al., 2005) because of the closely allied terms mud and clay for which competing definitions may emphasize grain size, mineralogy (clay dominated), or physical properties (plasticity ). In place of shale, the term mudstone is also used widely and describes the same compositional spectrum of sedimentary rocks. Because shales span the clay–silt boundary, a good many rocks that are identified as siltstones in the literature also qualify as shales (and vice versa). Although the term shale traditionally had a “terrigenous” connotation, shales that accumulated in sediment starved settings may to more than 50% consist of microbially induced early diagenetic cements...

Keywords

Black Shale Iron Sulfide Organic Geochemistry Internal Surface Area Iron Sulfide Formation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Jürgen Schieber
    • 1
  1. 1.Department of Geological SciencesIndiana UniversityBloomingtonUSA