气候变化领域集成服务门户(CCPortal): The rise of the Brunovistulicum: age; geological; petrological and geochemical character of the Neoproterozoic magmatic rocks of the Central Basic Belt of the Brno Massif

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DOI	10.1007/s00531-019-01700-2
	The rise of the Brunovistulicum: age; geological; petrological and geochemical character of the Neoproterozoic magmatic rocks of the Central Basic Belt of the Brno Massif
	Hanžl P.; Janoušek V.; Soejono I.; Buriánek D.; Svojtka M.; Hrdličková K.; Erban V.; Pin C.
发表日期	2019
ISSN	14373254
起始页码	1165
结束页码	1199
卷号	108 期号:4
英文摘要	The Brno Massif is the largest exposed part of the Brunovistulicum (eastern Bohemian Massif) representing Precambrian basement incorporated into the Central European Variscan Belt. Two well-known Cadomian granodiorite complexes of magmatic-arc origin are separated by N–S-trending belt of mafic rocks previously compared to ophiolite. This so-called Central Basic Belt is formed by a slightly metamorphosed volcanic part (Metabasite Zone) in the east and dominantly plutonic Diorite Zone in the west. Our new geological, geochemical and isotopic data including U–Pb zircon dating reveal two distinct Precambrian magmatic events within the Central Basic Belt preceding the Cadomian arc. The geochemical signatures of the dominant late Tonian (c. 730 Ma) tholeiitic basalts (εNd725 = + 7.8 to + 6.7) in the Metabasite Zone suggest a direct derivation from a mantle source in an extensional setting. Also, the associated sporadic rhyolitic lavas and tuffs are primitive, showing a short mean crustal residence (εNd725 = + 6.0 and + 5.7; TDMNd.2stg ~ 0.9 Ga). By contrast, the Cryogenian (c. 650 Ma) magmatism of the Diorite Zone clearly demonstrates features of a magmatic-arc origin. Rather primitive whole-rock geochemistry and radiogenic Nd isotopic signature (εNd655 values typically falling between + 7 and + 6) show that this arc was either intraoceanic, or developed on recently accreted, immature mafic crust. Based on all the available data, three successive tectono-magmatic stages have been identified in the Brno Massif in the Neoproterozoic times (c. 730–600 Ma), as products of a single long-lived, multi-stage subduction system spanning nearly full Neoproterozoic supercontinent cycle from the break-up of Rodinia to the assembly of Pannotia. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Brno Massif; Geochemistry; Neoproterozoic magmatic arc; Pannotia; Rodinia; U–Pb zircon dating
语种	英语
scopus关键词	continental breakup; geochemistry; magmatism; mantle source; metabasite; petrology; Proterozoic; Rodinia; subduction; tectonics; uranium-lead dating; zircon; Brno; Czech Republic; Jihomoravsky
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147845
作者单位	Czech Geological Survey, Klárov 3, Prague 1, 118 21, Czech Republic; Institute of Petrology and Structural Geology, Charles University, Albertov 6, Prague 2, 128 43, Czech Republic; Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, Prague 6, 165 00, Czech Republic; Département de Géologie, CNRS, Université Blaise Pascal, Campus Universitaire des Cezeaux, 6 Avenue Blaise Pascal, Aubiere Cedex, 63178, France
推荐引用方式 GB/T 7714	Hanžl P.,Janoušek V.,Soejono I.,et al. The rise of the Brunovistulicum: age; geological; petrological and geochemical character of the Neoproterozoic magmatic rocks of the Central Basic Belt of the Brno Massif[J],2019,108(4).
APA	Hanžl P..,Janoušek V..,Soejono I..,Buriánek D..,Svojtka M..,...&Pin C..(2019).The rise of the Brunovistulicum: age; geological; petrological and geochemical character of the Neoproterozoic magmatic rocks of the Central Basic Belt of the Brno Massif.International Journal of Earth Sciences,108(4).
MLA	Hanžl P.,et al."The rise of the Brunovistulicum: age; geological; petrological and geochemical character of the Neoproterozoic magmatic rocks of the Central Basic Belt of the Brno Massif".International Journal of Earth Sciences 108.4(2019).