Formation of granitic magmas during repeated orogenic events: an example from the Baltic Shield

Lindh, Anders; Holme, Kirsten

doi:10.1016/0301-9268(89)90033-8

Cited by 4 publications

(7 citation statements)

References 31 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.…”

Section: Introductionmentioning

confidence: 93%

“…The very low content of P is striking. Also in this plot, the anomalous behaviour of sample 8 790 is evident a 1.6 Ga granitoid used for modelling purposes (Lindh and Holme 1989). This 'standard' granitoid is a fairly siliceous and potassium-rich member of the suite.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…In this context I-type granite refers to a dominantly igneous source rock. The source of the granite is a continental rock, possibly the approximately 350 Ma older calcalkaline granitoid (Lindh and Holme 1989). The 1.25 Ga suite could also be described as A-type granites.…”

Section: Geological Settingmentioning

confidence: 99%

“…No chemical analyses of the G6sta granite have been published previously, but a few major element analyses performed to support a mapping project were briefly discussed by Lindh and Holme (1989). Persson and Hansen (1982) published 11 analyses of the Sundsta granite, together with an isotope dating of this granite with the Rb-Sr whole rock method.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…This 'standard' granitoid is a fairly siliceous and potassium-rich member of the suite. Lindh and Holme (1989) used it as a model protolith for the second generation (approximately 1.25 Ga) of microcline granitoids, which occur in the same terrane as the G6sta granite and its associates. A few features are striking in …”

Section: Chemical Compositionmentioning

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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