Shape and intrusion history of the Late Caledonian Newry Igneous Complex, Northern Ireland
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Abstract:
The Tellus high-resolution airborne magnetic and radiometric maps define previously unmapped zones within the Newry Igneous Complex, County Down.High-precision uranium-lead zircon dating of nine rock samples from different parts of the complex provides a robust set of age constraints (c.414-407 Ma), which confirm that the different plutons of the complex young towards the south-west.Combined, these new data allow an innovative model of intrusion to be developed, with intrusion beginning in the north-east and progressing towards the south-west.Keywords:
Radiometric dating
The geochemical studies are carried out for igneous rocks from Palong Pluton at the border area of Negeri Sembilan and Pahang. The study area is about 250 km2, covering the area of Kemayan, Pasoh and Serting. The purposes of the geochemical study are to classify and determine the chemical characteristic of the granitic rocks, to correlate and interpret the crystallization history of igneous rocks, to determine the rock genesis and to determine the origin of magma. The Palong Pluton is divided into three groups, namely the Kemayan Granite, Serting Granite and Lui Granite. The geochemical data are presented by TAS and Harker Diagrams. The geochemical results show that Kemayan Granite, Serting Granite and Lui Granite are naturally originated from a single magma source. The magma evolution started from Kemayan Granite to Lui Granite and Serting Granite by differentiation proceses.
Igneous differentiation
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Based on the zircon SHRIMP U-Pb dating research of the granodiorite of the Xueshan intrusion in Yishui County of Shandong province,concordant ages of 2 491±5 Ma(MSWD=0.43) composed by 14 points is obtained.It is regarded that this age can represent the formation age of the granodiorite.According to regional geological condition,it is conclued that the Xueshan intrusion is formed in the late stage of Newarchean.
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Geochronology
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Summary As a preliminary to an account of the marscoite suite of the Western Redhills Tertiary igneous centre of Skye, a description is given here of one unit, the ferrodiorite. While accepting Harker's hypothesis of the hybrid origin of marscoite (1904, pp. 175–196) we consider that the ferrodiorite, with which marscoite on Marsco is associated, is not itself a hybrid, but one of the parents from which the hybrids were formed. Among Thulean igneous rocks the ferrodiorite has mineralogical and chemical affinities with Hebridean mugearites, on the one hand, and with the ferrogabbros of the Skaergaard intrusion on the other, but is probably significantly different from both.
Layered intrusion
Affinities
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A group of slightly peraluminous Variscan plutons in Northern Portugal were selected from the study of zircon composition. The selected plutons are: the Vila Pouca de Aguiar and the Lavadores-Madalena plutons with I-type affinities and the Vieira do Minho pluton, an l-S transitional type. Zircon occurs as euhedral to subhedral crystals and exhibit finely concentric oscillatory magmatic zoning mainly related to variations of Hf, Y, U and Th concentrations. Most zircon crystals show the dominant “xenotime” substitution. The zircon crystals have Zr/Hf ratio in the range of 21 to 52, with no significant differences between the different granites. These values are in the same range of other peraluminous granites and are in accordance with a crustal signature of zircon. Moreover, the range of Zr/Hf valu es in zircon crystals overlaps with that of crustal sources and consequently to the potential protoliths proposed in the genesis of the Vieira do Minho and the Vila Pouca de Aguiar plutons, namely meta-igneous crustal sources at different levels. Although zircon from the Lavadores-Madalena pluton has a compositional range similar to the other plutons, an origin by hibridisation has been proposed. However, similar zircon chemistry between this pluton and Vila Pouca de Aguiar and Vieira do Minho plutons could also suggest a similar crustal source.
Protolith
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The high temperatures of igneous intrusives cause localized thermal maturity of sediments far in excess of the regional variation. Previous studies have shown that igneous bodies cool in less than about 1 million years for all but the most exceptional geological conditions. Three case studies are provided which show how the increase in thermal maturity around an igneous body can be used to assess the temperature of the intrusive at emplacement and also the time of intrusion. Corollative implications for localized hydrocarbon generation, migration, and accumulation are also discussed briefly.
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