A Manual for Tephrochronology: Collection, Preparation, Petrographic Description and Approximate Dating of Tephra (volcanic Ash)Steen-McIntyre, 1977 - 167 Seiten |
Inhalt
INTRODUCTION | 1 |
SAMPLING TEPHRA IN THE FIELD | 8 |
Sampling the Outcrop | 16 |
Urheberrecht | |
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Häufige Begriffe und Wortgruppen
acetone airfall deposits airfall tephra America Bull amphibole analysis apatite approximately blebs bromoform cent chemical clasts cleaning coarse ash collected composition contamination correlation crystal curve dacitic dacitic tephra detailed petrographic examination eruption etched filter fine-grained fraction Fryxell funnel Geology Glacier Peak glass shards grains heavy liquid heavy mineral phenocrysts Hueyatlaco hypersthene inclusions index oil Izett Jour La Malinche lapilli magma magnetic Malinche material Mazama mesh microlites microphenocryst microscope mounts outcrop particles petrographic Petrology phenocrysts plagioclase Pleistocene preparation procedure Puebla pumiceous pyroclastic flow Quaternary reference slide refractive index refractive index histogram relatively remove rocks Roedder sanidine sedimentary separation sieve Smith sodium soil solution source vent specific gravity spindle stage Steen-McIntyre superhydration surface tephra blanket tephra components tephra deposit tephra fragments tephra horizon tephra hydration dating tephra layers tephra samples tephra unit tephrochronology THICK THIN tion vesicles volcanic ash volcanic glass volume weathering Wilcox zircon