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peperite
A Peperite is a sedimentary rock that contains fragments of igneous material and is formed when magma comes into contact with wet sediments.〔(Skilling, I.P., White, J.D.L/ & McPhie, J. 2002. Peperite: a review of magma-sediment mingling, Journal of Volcanology and Geothermal Research, 114, 1-17 )〕 The term was originally used to describe rocks from the Limagne region of France,〔( de Goer de Herve, A. 2008. Chapter 5, Peperites from the Limagne Trench (Auvergne, French Massif Central), a distinctive feature of phreatomagmatic pyroclastics. History of semantic drift. In: Leyrit, H. & Montenat, C. (Eds.) Volcaniclastic rocks, from magmas to sediments, Taylor & Francis, 270pp. )〕 from the similarity in appearance of the granules of dark basalt in the light-coloured limestone to black pepper. Typically the igneous fragments are glassy and show chilled-margins to the sedimentary matrix, distinguishing them from clasts with a sedimentary origin.
==Terminology==
The term has been used to describe a wide variety of rocks that are interpreted to have formed by the interaction between magma and sediments. This usage has led to overlap with other terms such as hyaloclastite.〔 In the most recent edition of 'Igneous rocks' by Le Maître et al. 〔(Le Maître, R. W. et al. (Eds.) 2002. Igneous Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks )〕 the definition is given as "A local term for a tuff or breccia, formed by the intrusion of magma into wet sediments. Usually consists of glassy fragments of igneous rock and some sedimentary rock", while White (2000) defines peperite as "a genetic term applied to a rock formed essentially in situ by disintegration of magma intruding and mingling with unconsolidated or poorly consolidated, typically wet sediments. The term also refers to similar mixtures generated by the same processes operating at the contacts of lavas and other hot volcaniclastic deposits with such sediments".〔
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