Data · collection
Geochemical analyses of volcanic bombs erupted from Mount Erebus
Listed in NASA Earthdata CMR
This data set consists of geochemical analyses of volcanic bombs erupted from Mount Erebus between 1972 and 2004 and selected older lava samples from the summit area.
Description
Detailed electron microprobe analyses of minerals in the volcanic bombs are given in Appendix. Mount Erebus, Ross Island, Antarctica, is a large (3794 m) alkaline open-conduit stratovolcano that hosts a persistently convecting and degassing lake of anorthoclase-phyric phonolite magma.
The composition of the lava (magma) lake over the last 31 years was investigated by examining glass and mineral compositions in lava bombs erupted between December 1972 and January 2004. Olivine, clinopyroxene, titanomagnetite, fluor-apatite, and matrix glass compositions are invariant and show that the magmatic temperature (~1000°C) and oxygen fugacity (ΔlogFMQ = -0.9) have been constant. Anorthoclase phenocrysts up to 10 cm in length show complex textural and compositional zoning that reflects growth during convection in a PH2O gradient under isothermal conditions.
Read the rest (3 more)
Bomb textures and anorthoclase compositions suggest that crystallization occurs at low degrees of effective undercooling and is controlled by shallow degassing of water in the conduit. Minor variations in eruptive activity in the last 31 years are decoupled from magma compositions. The variations probably relate to changes in conduit geometry within the volcano and/or variable input of CO<sub>2</sub>-rich volatiles into the upper-level magma chamber from deeper in the system.
Eleven bulk samples of phonolite lava from the summit plateau that range in age from 0 ± 4 ka to 17 ± 8 ka were analyzed for major and trace elements. Small compositional variations are controlled by anorthoclase content. The lavas are indistinguishable from modern bulk tephra compositions and demonstrate that Mt.
Erebus has been erupting lava and tephra from the summit region with the same bulk composition for ~17 ka.
Links
Get the data
- ees.nmt.edu /Geop/mevo/geochem/geochem.html ↗
Representative analyses of volcanic rocks from Mt. Erebus
download · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214622349-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214622349-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Biogeochemical Processes · Magma Composition/Texture · Not provided
- Inferred from text
- Geochemistry 70%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214622349-SCIOPS | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3703 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (70%) |
| concepts[measured_variable].gcmd:earth-science/solid-earth/geochemistry/biogeochemical-processes | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/tectonics/volcanic-activity/eruption-dynamics/magma-composition-texture | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |