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Sample ID:Y-86
Station ID:Y-86
Date Sampled:2000-00-00
Sample Type 1:pyroclastic density current
Text Description:
Kaguyak Ignimbrite. medium brown-grey, mostly massive and unstratified but for one 2-m thick PCZ + 1-m-thick LCZ in upper 1/3 of cliff. Lithic-rich (10-15vol %); pumice-rich (30vol%); well-indurated, not quite sintered. Exposed thickness 20 m. PCZ: 2 m thick. LCZ: 1.5 m thick. See text for MP and ML. Pumice clasts: most pumices are 1-5 cm; hard to find big pumice clasts; grey to white dacite; some banded grey/white pumice clasts; many dacite pumices are full of large (to 0.5 cm) pxn-clot blebs. Lithic clasts: dominantly pl-rich dacite lava with minor Jn (all <4 cm); scarcer crystal-poor, green lava

Kaguyak dome field and its Holocene caldera, Alaska Peninsula


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