The chemical composition of the Ursand granite, SW Sweden

Holme, Kirsten; Lindh, Anders

doi:10.1080/11035899109453846

Cited by 2 publications

(4 citation statements)

References 15 publications

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“…This range overlaps the calcic-calc-alkalic transition (Peacock 1931). In this respect, the G6sta granite is similar to the older suite (Lindh 1984), but different from the younger suite of granitoids (Holme 1986(Holme , 1988Holme and Lindh 1991). Like most high silica granitoids this granite is normally slightly corundum-normative; the maximum normative corundum content is 1.5% (mean 0.5%).…”

Section: Chemical Compositionmentioning

confidence: 88%

“…This is another illustration that this type of tectonic classification diagram should be applied with great caution (Roberts and Clemens 1993;Twist and Harmer 1987). Chemically, the G6sta granite is different both from its approximately 1.25 Ga old successors in the SGC (Holme 1986;1988;Holme and Lindh 1991) and the older microcline granites in the TIB (Lindh and Persson 1991). This discussion focuses on the possibility of constraining the physical conditions of melting and the source rock of the magma.…”

Section: Discussionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 93%

“…The geochemical trend of the 1.25 Ga suite ranges from quartz monzonite and syenite to granite. Owing to their chemical composition the rocks are considered as I-type granites (Holme 1986(Holme , 1988Holme and Lindh 1991;Lindh and Persson 1991). In this context I-type granite refers to a dominantly igneous source rock.…”

Section: Geological Settingmentioning

confidence: 99%

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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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