intraclastとは 意味・読み方・使い方

名詞

intraclast (plural intraclasts)

1. (geology) A sediment formed by the redeposition of material erodes from an original deposit.
   • 1971, Journal of Sedimentary Petrology, page 716:

     In thin section the rock is composed of intraclasts (180/i modal diameter) and foraminifera (180/i modal diameter), in a matrix of microspar (4/i to 8/i diameter; mode 7fi.).

   • 2000, Philip Martin Bethke, Ancient Lake Creede: Its Volcano-tectonic Setting, History of Sedimentation, and Relation to Mineralization in the Creede Mining District‎:

     The bodies of these beds typically show coarse-tail reverse grading of pumice and sedimentary intraclasts or coarse-tail normal grading of all clasts, although grading is absent in some of the intraclast-rich breccia beds.

   • 2007, Bernhard Hubmann, Fossil Corals and Sponges: Proceedings of the 9th International Symposium on Fossil Cnidaria and Porifera, Graz 2003:

     They are regarded as distal turbidites and are interbedded with bioclastic limestones and massive breccioid limestones containing blocks of coral colonies and intraclasts that are regarded as proximal turbidites.