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Petrology of Basalt Fragments Recovered with Manganese Nodules in Marquesas Fracture Zone, South Central Pacific

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Title Petrology of Basalt Fragments Recovered with Manganese Nodules in Marquesas Fracture Zone, South Central Pacific
 
Creator Roonwal, G S
 
Description 138-142
A suite of 12basalt samples recovered at 9 sites vary from volcanic glass, vesicular glassy basalt to fine grained basalt, and show gJomeroprophyritic texture. They consist of plagioclase (An68-70) in varying propOrtion, augite (2Vz 53°-56°), palagonite, and opaques. The anorthite content in plagioclase phenocrysts is higher (An73 -75)than that of the tiny phenocryst needles in the groundmass (An60 -70) Glassy groundmass contains several round to sub-round globules, probably representing immiscible liquid drops and devitrified glass. Chemically, the basalts are Fe and Ti enriched tholeiites. There is also a remarkable positive correlation between the oxide pairs TiO2 to P2O5, K2O, MgO, and A12O3. These rocks represent undifferentiated nature and appear to represent the original composition of the magma.
 
Date 2016-12-19T09:39:06Z
2016-12-19T09:39:06Z
1983-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/38878
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.12(3) [September 1983]