单词	volcaniclastic
释义	volcaniclastic /vɒlˌkanɪˈklastɪk / adjective Geology Relating to or denoting a clastic rock which contains volcanic material: volcaniclastic sediments... Late Devonian to Carboniferous rocks consist of interbedded mudrocks, sandstones and volcaniclastic strata, whereas the Permian rocks are crystalline limestone with subordinate clastic and volcaniclastic sediments. The sediments are partly clastic and partly volcaniclastic because volcanism is active along such margins. Well-rounded clasts include lava, volcaniclastic sandstones and bioclastic limestones with nummulites, bryozoa, microbial carbonate and bivalve material.
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