Sample: 96-ARh-59D
Sample ID: | 96-ARh-59D [1] [2] | ||||||||||
Station ID: | 96-ARh-59 | ||||||||||
AT Num: | |||||||||||
Volcano: | Akutan | ||||||||||
Possible source: | |||||||||||
Eruption: | |||||||||||
Collector: | Richter, D. H. | ||||||||||
Date sampled: | 1996-00-00 | ||||||||||
Sample type 1: | Lava | ||||||||||
Color: | |||||||||||
Final unit: | lbc | ||||||||||
Text Description: | Qocd - older caldera wall rocks (Pleistocene). Dome. Small dome or thick flow of banded, mixed magma, of porphyritic high-silica andesite. Dark bands (59.2% SiO2, loc. 9, table 1) are medium dark gray and consist of phenocrysts of plagioclase (5-10%, 2 mm), clinopyroxene (1-3%, 1.5 mm), and orthopyroxene (trace -1%, <1 mm) in a cryptofelsitic groundmass. | ||||||||||
Sample Location: |
Legend ✕
100 km 50 mi |