The origin of some New Zealand metamorphic rocks as shown by their major and trace element composition
Identifieur interne : 001E31 ( Main/Merge ); précédent : 001E30; suivant : 001E32The origin of some New Zealand metamorphic rocks as shown by their major and trace element composition
Auteurs : S. R. Taylor [États-Unis]Source :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1955.
Abstract
In a study of a portion of the regionally metamorphosed Alpine Schist Belt, South Island, New Zealand, where thin beds of green schists are interbedded with quartz-albite-biotite schists, the redistribution of the chemical elements by metamorphism is shown to have been slight, so that chemical data can be used to indicate the nature of the parent rock.Ten analyses are reported for the quartz-albite-biotite-(calcite)-(clinozoisite) schists (Arahura series). The distribution of the elements, in particular, F, V, Mn, Na, Ca, Sr, K, and Ba, indicates that the parent rocks were of greywacke type composed of essentially unweathered minerals, while the source rocks were high in alkali feldspar.Seven analyses are given for the green schists (Pounamu Series). They show significantly higher amounts of Cr, Mg, Ni, Co, and Cu and lower amounts of P, Ti, Sr, Ba, and K compared with the enclosing Arahura schists. One group of three ten-foot beds is interpreted as being derived from sills of basaltic composition. A thicker unit is of more basic (olivine or picrite basalt) composition, and the distribution of Cr, Fe, Mg, Ti, Ni, Co, Cu, V, Sc, Na, and Ca indicates gravitational differentiation in the original sill. It is also concluded that the intrusion took place prior to deformation as well as metamorphism.
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DOI: 10.1016/0016-7037(55)90052-1
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