Plagioclase Ultraphyric Basalts (PUB) from the Northeastern (NE) Pacific Ridge System: Mineral Textures and Geochemical Characteristics
Abstract:
Plagioclase crystals in plagioclase ultraphyric basalts (PUB) record changes in the major, trace, and isotopic compositions of evolving magmas. Those changes represent the record of specific processes in the crust and upper mantle that impart distinct crystal textures onto which chemical signatures are written. We report on the textural and compositional characteristics of PUB lavas from the Northeastern (NE) Pacific Ridge System (Juan de Fuca Ridge, Blanco Fracture Zone, and Gorda Ridge). The distribution of textural and compositional characteristics (e.g., single mode, bimodal, or trimodal distribution) are consistent with the presence of more than one parental magma in some samples. Specifically, we found that the populations of different textural types of plagioclase megacrysts are not compositionally distinct. We interpret the disconnect between texture and composition to be indicative of a system characterized by mixing of similar batches of magma resulting in populations of plagioclase megacrysts dominated by homogeneity or small degrees of normal/reverse zoning in most but not all cases.
How to cite this dataset:
Hewitt, J. B., Ustunisik, G. K., Nielsen, R. L., 2025. Plagioclase Ultraphyric Basalts (PUB) from the Northeastern (NE) Pacific Ridge System: Mineral Textures and Geochemical Characteristics, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA).
https://doi.org/10.60520/IEDA/113669. Accessed 2025-02-22.
DOI Creation Date:
2025-01-23
License:
Creative Commons Attribution 4.0 International [CC-BY-4.0]
Funding source(s):
National Science Foundation:
1634206 National Science Foundation:
1634211 South Dakota Board of Reagents grant: 441946
Geological Society of America student grant
Keyword(s):
Coverage Scope: Regional (Continents, Oceans)
Geographic Location: Juan de Fuca Ridge, Blanco Fracture Zone, and Gorda Ridge
User Contributed Keyword(s):
plagioclase ultraphyric basalts, pacific ridge, mineral texture
Data Available On:
2025-01-24