Zircon Hf isotope perspective on the origin of granitic rocks from eastern Bavaria, SW Bohemian Massif

doi:10.1007/s00531-009-0442-4

	Zircon Hf isotope perspective on the origin of granitic rocks from eastern Bavaria, SW Bohemian Massif
	Siebel, Wolfgang 1; Chen, Fukun 2
刊名	INTERNATIONAL JOURNAL OF EARTH SCIENCES
	2010-07-01
卷号	99 期号:5 页码:993-1005
关键词	Bohemian Massif Granitoid Hafnium Isotopes Laser Ablation Icp-ms Variscan Zircon
ISSN号	1437-3254
DOI	10.1007/s00531-009-0442-4
文献子类	Article
英文摘要	The petrogenetic potential of in situ laser ablation Hf isotope data from melt precipitated zircons was explored through the analyses of about 700 individual crystals derived from about 20 different granitic intrusions covering the Variscan basement segment of eastern Bavaria, SE Germany. In combination with geochemical features, four major suites of granitic rocks can be distinguished: (1) NE Bavarian redwitzites (52-57 wt% SiO2, intrusion ages around 323 Ma) have chondritic epsilon Hf(t) values (+0.8 to -0.4). The redwitzites are hybrid rocks and the Hf data are permissive of mixing of a mantle progenitor and crustal melts. (2) Various intermediate rock types (dioritic dyke, granodiorite, palite, 59-63 wt% SiO2, 334-320 Ma) from the Bavarian Forest yield negative epsilon Hf(t) values between -3.4 and -5.1. These values which apparently contradict a mantle contribution fingerprint an enriched (metasomatized) mantle component that was mixed with crustal material. (3) Voluminous, major crust forming granites sensu stricto (67-75 wt% SiO2, 328-298 Ma) are characterized by a range in epsilon Hf(t) values from -0.5 to -5.6. Different crustal sources and/or modification of crustal melts by various input of juvenile material can explain this variation. (4) Post-plutonic (c. 299 Ma) porphyritic dykes of dacitic composition (64-67 wt% SiO2) from the southern Bavarian Forest have chondritic epsilon Hf(t) values (+0.6 to -1.1) and display large intergrain Hf isotope variation. The dykes form a separate petrogenetic group and the Hf data suggest that the zircons crystallized when a pristine mantle-derived parental melt was modified by infiltration of crustal material. The zircon Hf data form a largely coherent positive array with the whole-rock Nd data and both systems yield similar two-stage depleted mantle model ages (1.1-1.7 Ga).
WOS关键词	COMBINED U-PB ; NE BAVARIA ; LU-HF ; DETRITAL ZIRCONS ; RB-SR ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; HAFNIUM ISOTOPE ; RATIO ANALYSIS ; ND
WOS研究方向	Geology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000278621700003
资助机构	Robert-Bosch Stiftung ; Robert-Bosch Stiftung ; Robert-Bosch Stiftung ; Robert-Bosch Stiftung ; Robert-Bosch Stiftung ; Robert-Bosch Stiftung ; Robert-Bosch Stiftung ; Robert-Bosch Stiftung
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/73261]
专题	中国科学院地质与地球物理研究所
通讯作者	Siebel, Wolfgang
作者单位	1.Univ Tubingen, Inst Geowissensch, D-72074 Tubingen, Germany 2.Chinese Acad Sci, Lab Radiogen Isotope Geochem, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Siebel, Wolfgang,Chen, Fukun. Zircon Hf isotope perspective on the origin of granitic rocks from eastern Bavaria, SW Bohemian Massif[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2010,99(5):993-1005.
APA	Siebel, Wolfgang,&Chen, Fukun.(2010).Zircon Hf isotope perspective on the origin of granitic rocks from eastern Bavaria, SW Bohemian Massif.INTERNATIONAL JOURNAL OF EARTH SCIENCES,99(5),993-1005.
MLA	Siebel, Wolfgang,et al."Zircon Hf isotope perspective on the origin of granitic rocks from eastern Bavaria, SW Bohemian Massif".INTERNATIONAL JOURNAL OF EARTH SCIENCES 99.5(2010):993-1005.