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Zeolite Facies Metamorphism, Geochemistry and Some Aspects of Trace Element Redistribution in Altered Basalts of DSDP, Leg 37
| Content Provider | Semantic Scholar |
|---|---|
| Author | Andrews, A. R. J. Barnett, Robert L. Clement, B. A. E. Mac Fyfe, William Sefton Morrison, Glenn Macrae, Nancy Starkey, John |
| Copyright Year | 1977 |
| Abstract | Oxidation and hydration of DSDP Leg 37 basalts occur within, and immediately adjacent to channelways such as cracks, vesicles, and breccias and are a consequence of the movement of fluids, most likely seawater, through such permeable areas. There is no evidence to suggest an increase in grade with depth. Alteration is uniform, never exceeds zeolite grade, and has involved the generation of clay minerals, mainly potassium-rich saponite and zeolites, mainly phillipsite. Prehnite occurs in one sample of gabbro breccia which has experienced rather intense hydrothermal alteration. Electron microprobe analysis of zoned saponite in vesicles reveals a gradual transition from green Fe rich-Mg poor saponite in the rim to colorless or black Mg rich-Fe poor saponite in the core. Oxidation halos are commonly 10-15 times and up to 20 times the width of associated cracks and veins. Veins characteristically contain clastic carbonate and foraminiferal tests sluiced in from the ocean floor, and highly altered fragments of wall rock, which in one specimen, contain native copper. Spark source mass spectrometric analysis of fresh basalt and oxidized material from adjacent to veins suggests that, with the possible exception of Mn, the distributions of Ti, Ni, Co, Cu, Zn, and Sr are not much affected by interaction with low temperature, permeating seawater. |
| File Format | PDF HTM / HTML |
| DOI | 10.2973/dsdp.proc.37.162.1977 |
| Alternate Webpage(s) | http://deepseadrilling.org/37/Volume/dsdp37_62.pdf |
| Alternate Webpage(s) | https://doi.org/10.2973/dsdp.proc.37.162.1977 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
