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Got glass? Glass from sediment and Foraminifera tests contribute clues to volcanic history

Alice S. Davis and David A. Clague
Got glass? Glass from sediment and Foraminifera tests contribute clues to volcanic history
Geology (Boulder) (February 2003) 31 (2): 103-106

Abstract

Volcanic glass fragments recovered from sediment collected in the Escanaba Trough and on traverses up the west walls at two locations on the Gorda Ridge greatly extend information on the petrologic diversity of the region obtained from outcrops. Compositions of glass grains found loose in sediments or agglutinated in the tests of benthic foraminifers provide information on compositions of unexposed flows that were covered by later eruptions and/or sediment. Many of the glass grains have compositions that closely match those of lava outcrops, indicating that they formed by spalling off pillow rims and quench granulation. Bubble-wall glass shards found only in the sediment give evidence of explosive eruptions that occurred despite great depth. Some of the glass fragments from the walls of the axial valley have unusually high K (sub 2) O (to >0.7%) that is not represented by any sampled outcrop. Such enriched mid-oceanic-ridge basalt compositions have not previously been reported from the Gorda Ridge. Analyzing glass grains from the sediment in addition to rims of lava samples allows a more comprehensive characterization of the volcanic history of the region.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 31
Serial Issue: 2
Title: Got glass? Glass from sediment and Foraminifera tests contribute clues to volcanic history
Affiliation: Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States
Pages: 103-106
Published: 200302
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 2003-018489
Categories: OceanographyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N40°25'00" - N41°10'00", W127°34'60" - W127°10'00"
N41°30'00" - N42°00'00", W127°30'00" - W127°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200306
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