(Table 3, 4, and 5 - page 458, 460, 470) Optical spectrographic analyses of samples from AMPHITRITE, supplement to: Bonatti, Enrico (1967): Mechanisms of deep-sea volcanism in the South Pacific. In: Abelson, P (Ed.) Researches in Geochemistry, Wiley, New York, 2, 453-491

It is stressed that the main difference between quiet and hyaloclastic activity is that in the former the interaction between hot lava and seawater during the eruption is minimal, whereas it is very extensive in the latter. This strong interaction is the cause of the processes which accompany hyaloclastic eruptions, processes which, in their turn, influence the chemistry and mineralogy of wide areas of the Pacific Ocean floor. Admittedly they are not well known yet, but their extensive study seems worthwhile. Two suggestions based on data presented here may be pointed out : 1) Deep-sea basaltic rocks showing breccia and/or ash-like features must not necessarily have erupted under shallow water or above sea level, as is commonly believed. 2) The "altered" or "fresh" appearance of submarine basalts is not necessarily to be ascribed to the relative age or youth of the rock. In fact extensive "alteration" of submarine lavas may commonly take place rapidly at high temperature during the eruption, rather than gradually after emplacement as is generally the case in subaerial formations. Deep-sea waters of the Pacific normally have a pH close to 7 and a rather constant low temperature, close to 0°C. Alteration of igneous minerals after emplacement under such conditions must be exceedingly slow, and concepts of "weathering" as learned in surface geology cannot be applied.

Identifier
DOI https://doi.org/10.1594/PANGAEA.849211
PID http://hdl.handle.net/10013/epic.45968.d001
Related Identifier https://doi.org/10.7289/V52Z13FT
Related Identifier https://doi.org/10.7289/V53X84KN
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.849211
Provenance
Creator Bonatti, Enrico; Joensuu, O
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1967
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 64 data points
Discipline Earth System Research
Spatial Coverage (-126.500W, -18.600S, -108.133E, -7.833N); Pacific Ocean
Temporal Coverage Begin 1963-12-20T00:00:00Z
Temporal Coverage End 1963-12-31T00:00:00Z