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Lithic fragment (geology)

January 01, 1970

Lithic fragments, or lithics, are pieces of other rocks that have been eroded down to sand size and now are sand grains in a sedimentary rock. They were first described and named (in their modern definitions) by Bill Dickinson in 1970.[1] Lithic fragments can be derived from sedimentary, igneous or metamorphic rocks. A lithic fragment is defined using the Gazzi-Dickinson point-counting method and being in the sand-size fraction. Sand grains in sedimentary rocks that are fragments of larger rocks that are not identified using the Gazzi-Dickinson method are usually called rock fragments instead of lithic fragments. Sandstones rich in lithic fragments are called lithic sandstones.

Types edit

Igneous (Lv) edit

These can include granular (~rhyolitic), microlitic (~andesitic), lathwork (~basaltic), and vitric (glassy). These correlations between composition and volcanic lithic fragment type are approximate, at best.[2][3] By definition, intrusive igneous rock fragments can not be considered lithic fragments.

Sedimentary (Ls) edit

These can include shale siltstone fragments, and (at times) chert.

Metamorphic (Lm) edit

These can include fine-grained schist and phyllite fragments, among others.


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    Granular volcanic lithic fragment, scale in millimeters Top picture in plane-polarized light, bottom picture in cross-polarized light.
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    Microlitic volcanic lithic fragment, scale in millimeters. Top picture in plane-polarized light, bottom picture in cross-polarized light.
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    Lathwork volcanic lithic fragment, scale in millimeters. Top picture in plane-polarized light, bottom picture in cross-polarized light.
  •  
    Vitric volcanic lithic fragment, scale in millimeters. Top picture in plane-polarized light, bottom picture in cross-polarized light.

References edit

  1. ^ Dickinson, W. R. (1970). "Interpreting detrital modes of graywacke and arkose". Journal of Sedimentary Petrology. 40: 695–707.
  2. ^ Affolter, M.D. and Hendrix, M. S., 2004, Correlations between volcanic lithic fragments and volcanic rock, Geological Society of America Abstracts with Programs, Vol. 36, No. 5, p. 370
  3. ^ Mathew D. Affolter, Raymond V. Ingersoll; Quantitative Analysis of Volcanic Lithic Fragments. Journal of Sedimentary Research ; 89 (6): 479–486. doi: https://doi.org/10.2110/jsr.2019.30
 

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January 01, 1970
lithic, fragment, geology, lithic, fragments, lithics, pieces, other, rocks, that, have, been, eroded, down, sand, size, sand, grains, sedimentary, rock, they, were, first, described, named, their, modern, definitions, bill, dickinson, 1970, lithic, fragments,. Lithic fragments or lithics are pieces of other rocks that have been eroded down to sand size and now are sand grains in a sedimentary rock They were first described and named in their modern definitions by Bill Dickinson in 1970 1 Lithic fragments can be derived from sedimentary igneous or metamorphic rocks A lithic fragment is defined using the Gazzi Dickinson point counting method and being in the sand size fraction Sand grains in sedimentary rocks that are fragments of larger rocks that are not identified using the Gazzi Dickinson method are usually called rock fragments instead of lithic fragments Sandstones rich in lithic fragments are called lithic sandstones Contents 1 Types 1 1 Igneous Lv 1 2 Sedimentary Ls 1 3 Metamorphic Lm 2 ReferencesTypes editIgneous Lv edit These can include granular rhyolitic microlitic andesitic lathwork basaltic and vitric glassy These correlations between composition and volcanic lithic fragment type are approximate at best 2 3 By definition intrusive igneous rock fragments can not be considered lithic fragments Sedimentary Ls edit These can include shale siltstone fragments and at times chert Metamorphic Lm edit These can include fine grained schist and phyllite fragments among others nbsp Granular volcanic lithic fragment scale in millimeters Top picture in plane polarized light bottom picture in cross polarized light nbsp Microlitic volcanic lithic fragment scale in millimeters Top picture in plane polarized light bottom picture in cross polarized light nbsp Lathwork volcanic lithic fragment scale in millimeters Top picture in plane polarized light bottom picture in cross polarized light nbsp Vitric volcanic lithic fragment scale in millimeters Top picture in plane polarized light bottom picture in cross polarized light References edit Dickinson W R 1970 Interpreting detrital modes of graywacke and arkose Journal of Sedimentary Petrology 40 695 707 Affolter M D and Hendrix M S 2004 Correlations between volcanic lithic fragments and volcanic rock Geological Society of America Abstracts with Programs Vol 36 No 5 p 370 Mathew D Affolter Raymond V Ingersoll Quantitative Analysis of Volcanic Lithic Fragments Journal of Sedimentary Research 89 6 479 486 doi https doi org 10 2110 jsr 2019 30 nbsp This article related to petrology is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Lithic fragment geology amp oldid 1146575426, wikipedia, wiki, book, books, library,

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