DOI: 10.1007/s00531-012-0852-6
论文题名: Early Carboniferous (Viséan) emplacement of the collisional Kłodzko-Złoty Stok granitoids (Sudetes, SW Poland): Constraints from geochemical data and zircon U-Pb ages
作者: Mikulski S.Z. ; Williams I.S. ; Bagiński B.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期: 4 起始页码: 1007
结束页码: 1027
语种: 英语
英文关键词: SHRIMP geochronology
; Sudetes
; Variscan granitoids
; Zircon
Scopus关键词: Carboniferous
; continental collision
; continental crust
; continental margin
; emplacement
; fractional crystallization
; geochronology
; granitoid
; Hercynian orogeny
; igneous geochemistry
; magmatism
; partial melting
; SHRIMP dating
; uranium-lead dating
; zircon
; Bohemian Massif
; Poland
; Sudetes
英文摘要: Sensitive high-resolution ion microprobe zircon U-Pb dating and geochemical data of igneous rocks from the composite Kłodzko-Złoty Stok (KZS) Granite Pluton, Sudetic Block, indicate that the granitoids represent an Early Carboniferous Viséan phase of Variscan metaluminous, high-K, I-type, syn-collisional granite magmatism within the Saxothuringian Zone of the Central European Variscides. Igneous zircon records hypabyssal magmatism that produced various granitoids and lamprophyre (spessartite) emplaced from ca. 340 to 331 Ma. The KZS granitoids have compositions ranging from granodiorite to monzonite, low A/CNK ratios (<1), and are associated with abundant mafic members. Most of them are alkaline, highly potassic, and moderately evolved. The major and trace element contents of the KZS granitoids suggest geochemical heterogeneity, and the hybrid nature of magmas derived from a range of sources in the middle crust, with a strong input of material from the upper mantle. Mixing of magmas of mantle origin with high-K material from partly melted continental crust was probably a more important factor than fractional crystallization, in controlling the evolution of the magmas. The mean Pb-U ages of the main population of igneous zircon from a quartz monzodiorite (Żelazno) and hornblende monzonite (Droszków) are 340.2 ± 2.5 Ma and 339.5 ± 3.1 Ma, respectively. A slightly younger biotite-hornblende granodiorite from Chwalisław, 336.7 ± 2.5 Ma, was cut by a spessartite dyke at 333.1 ± 3.1 Ma. This indicates that mafic magmas were immediately intruded into fractured, probably incompletely solidified, granodiorites. The lamprophyric dyke also contains igneous zircon of Neoproterozoic age, 566.3 ± 6.4 Ma, typical of the crust in the Saxothuringian Zone. Tonalite from Ptasznik Hill near Droszków is of similar age to the spessartite, 331.5 ± 2.6 Ma. High REE contents in the tonalite and its igneous zircon indicate advanced differentiation of granitic magma, producing a more leucocratic melt associated with post-magmatic activity including abundant late crosscutting pegmatites and quartz veins, and contact metasomatic mineralization. The KZS granitoids have rather similar petrographic and geochemical characteristics to granitoids from other parts of the Central European Variscides, where a thickened orogenic root caused a substantial rise in crustal temperatures, producing granitoid magmas closely correlated with regional tectonic activity between the Saxothuringian and Brunovistulia Terranes at the NE margin of the Bohemian Massif. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878116032&doi=10.1007%2fs00531-012-0852-6&partnerID=40&md5=157a05ef72385292ed205d99bf723ba6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70552
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Polish Geological Institute, National Research Institute, ul. Rakowiecka 4, 00-975 Warszawa, Poland; Research School of Earth Sciences, The Australian National University, ACT, ACT, 0200, Australia; Institute of Geochemistry, Mineralogy and Petrology Warsaw University, al. Zwirki i Wigury 93, 02-089 Warszawa, Poland
Recommended Citation:
Mikulski S.Z.,Williams I.S.,Bagiński B.. Early Carboniferous (Viséan) emplacement of the collisional Kłodzko-Złoty Stok granitoids (Sudetes, SW Poland): Constraints from geochemical data and zircon U-Pb ages[J]. International Journal of Earth Sciences,2013-01-01,102(4)