Trace-element variation in a suite of Proterozoic calc-alkaline granitoids, Sweden

Lindh, Anders

doi:10.1080/11035899109453848

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…A calc-alkaline suite is followed by at least three suites of microcline granites. Earlier results from this research have been presented by Lindh and Gorbatschev (1984), Lindh (1984Lindh ( , 1991, Holme (1986Holme ( , 1988, Lindh and Holme (1989), Holme and Lindh (1991) and Lindh and Persson (1991). In the papers referred to, almost no data from the oldest of the three microcline granite suites is discussed.…”

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confidence: 94%

Granitic rocks as a source of granite: The G�sta and Sundsta Granites, south-west Sweden

Lindh

Johansson

1995

Geol Rundsch

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Granites, among them three generations of microline-rich granites, intruded repeatedly between 1 600 and 900 Ma in the South-western Swedish Gneiss Complex. The deformed and metamorphosed G6sta and Sundsta granites are medium-grained, pale greyish red rocks belonging to the oldest generation of microclinerich granites.Biotite dominates over hornblende. Allanite, titanite, apatite and zircon are important accessory minerals. The granites are metaluminous and syeno-to monzogranitic in composition. SiO2 varies between 70.4 and 78.7% and KzO/Na20 between 0.86 and 2.32. Na and K are poorly correlated with the other major elements. The rocks are low in MgO (< 0.9%) and FeO (< 3.6%). They are characterized by high Rb/Sr, Ba/Sr and Ba/Rb ratios. The ratio Nb/Ta is almost constant (,~ 12) and the ratio A1/Ga decreases slightly with increasing SiO2 content. The G6sta granite has small, negative Eu anomalies, differentiated light and almost flat heavy rare earth element patterns. It intruded into continental crust approximately 1560 Ma ago. It is argued that the granites formed from continental rocks by pseudoeutectic partial melting at a fairly shallow depth. The source is older than the dominant country rock.

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