| one publication added to basket [77263] | Ultramafic and mafic rocks from the Garret Transform Fault near 13°30′S on the East Pacific Rise: igneous petrology
Hébert, R.; Bideau, D.; Hekinian, R. (1983). Ultramafic and mafic rocks from the Garret Transform Fault near 13°30′S on the East Pacific Rise: igneous petrology. Earth Planet. Sci. Lett. 65(1): 107-125. https://dx.doi.org/10.1016/0012-821X(83)90193-0
In: Earth and Planetary Science Letters. Elsevier: Amsterdam. ISSN 0012-821X; e-ISSN 1385-013X, more
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| Keywords |
Earth sciences > Geology > Petrology
Rocks > Igneous rocks
ISE, East Pacific Rise [Marine Regions]
Marine/Coastal |
| Authors | | Top |
- Hébert, R.
- Bideau, D.
- Hekinian, R.
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| Abstract |
Serpertinized peridotites, metagabbros and fresh basaltic rocks were dredged from the Garret Transform Fault near 13 degree S on the East Pacific Rise. Two dredge hauls taken on the northern wall (from about 3100-3600 m) consisted of aphyric and picritic basalts; while peridotites, gabbros and moderately phyric basalts were recovered in a single dredge located near the deepest part (4616-4820 m) of the transform valley. Well preserved igneous textures and mineralogical assemblages enabled differentiation between tectonites (including harzburgites and clinopyrozene-bearing harzburgites) and cumulates (consisting of plagioclase-dunite, troctolies, olivine-gabbros and ilmenite-gabbros). The harzburgites are likely to represent deep-seated peridoties left after extraction of basaltic melt during upper mantle partial melting of a lherzolite. The ultramafic cumulates underwent some deformation and show textural and mineralogical evidences which suggest formation at a minimum depth corresponding to the very lower crust. |
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