Alpine Tethys closure as revealed by amphibole-rich mafic and ultramafic rocks from the Adamello and the Bergell intrusions (Central Alps)

doi:10.1144/jgs2013-139

	Alpine Tethys closure as revealed by amphibole-rich mafic and ultramafic rocks from the Adamello and the Bergell intrusions (Central Alps)
	Tiepolo, Masimo 1; Tribuzio, Ricardo 1,2; Ji, Wei-Qiang 3; Wu, Fu-Yuan 3; Lustrino, Michele 4,5
刊名	JOURNAL OF THE GEOLOGICAL SOCIETY
	2014-11-01
卷号	171 期号:6 页码:793-799
ISSN号	0016-7649
DOI	10.1144/jgs2013-139
文献子类	Article
英文摘要	U-Pb ages and Hf isotope data were obtained for zircon from amphibole-rich mafic to ultramafic rocks from the Adamello batholith and the Bergell pluton, the largest Palaeogene intrusions of the Alpine Orogen. The Pb-206/U-238 age pattern of U-Pb concordant dates from the Adamello mafic rock shows a major crystallization event at c. 41 Ma and older age peaks at c. 50 and c. 45 Ma. Hornblendite and amphibole gabbro samples of the Adamello batholith have zircon with initial epsilon Hf of c. +9.0 and c. +7.0, respectively. Amphibole gabbro and diorite samples of the Bergell pluton yield a younger age of c. 31 Ma and have zircon with lower initial epsilon Hf (c. +4.0). We propose that the amphibole-rich rocks from the Adamello batholith originated from a depleted mantle source activated by the subduction of the Ligurian-Piedmontese Basin. The amphibole-rich rocks from the Bergell pluton formed 10-15 Ma later than the Adamello counterparts by melts derived from a mantle sector metasomatized by the subduction of the Valais Basin. The enriched Hf isotopic signature of the amphibole-rich rocks from the Bergell pluton is therefore interpreted to reflect the peculiar lithostratigraphy of the Valais Basin or a primary feature of the newly activated mantle source.
WOS关键词	ND ISOTOPIC COMPOSITION ; WESTERN ALPS ; JURASSIC OPHIOLITES ; MASS-SPECTROMETRY ; PB GEOCHRONOLOGY ; OCEANIC-CRUST ; EASTERN ALPS ; LU-HF ; SUBDUCTION ; ZIRCON
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC PUBL HOUSE
WOS记录号	WOS:000345012800005
资助机构	'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; Ateneo La Sapienza ; Ateneo La Sapienza ; PRIN(20107ESMX9_001) ; PRIN(20107ESMX9_001) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; Ateneo La Sapienza ; Ateneo La Sapienza ; PRIN(20107ESMX9_001) ; PRIN(20107ESMX9_001) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; Ateneo La Sapienza ; Ateneo La Sapienza ; PRIN(20107ESMX9_001) ; PRIN(20107ESMX9_001) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; 'Programma di Ricerca di Interesse Nazionale' of Italian 'Ministero dell'Universita e della Ricerca'(20099SWLYC) ; Ateneo La Sapienza ; Ateneo La Sapienza ; PRIN(20107ESMX9_001) ; PRIN(20107ESMX9_001)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84920]
专题	中国科学院地质与地球物理研究所
通讯作者	Tiepolo, Masimo
作者单位	1.UOS Pavia, CNR, Ist Geosci & Georisorse, Pavia, Italy 2.Univ Pavia, Dipartimento Sci Terra & Ambiente, Pavia, Italy 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 4.Univ Roma La Sapienza, Dipartimento Sci & Terra, I-00185 Rome, Italy 5.CNR, Ist Geol Ambientale & Geoingn, Rome, Italy
推荐引用方式 GB/T 7714	Tiepolo, Masimo,Tribuzio, Ricardo,Ji, Wei-Qiang,et al. Alpine Tethys closure as revealed by amphibole-rich mafic and ultramafic rocks from the Adamello and the Bergell intrusions (Central Alps)[J]. JOURNAL OF THE GEOLOGICAL SOCIETY,2014,171(6):793-799.
APA	Tiepolo, Masimo,Tribuzio, Ricardo,Ji, Wei-Qiang,Wu, Fu-Yuan,&Lustrino, Michele.(2014).Alpine Tethys closure as revealed by amphibole-rich mafic and ultramafic rocks from the Adamello and the Bergell intrusions (Central Alps).JOURNAL OF THE GEOLOGICAL SOCIETY,171(6),793-799.
MLA	Tiepolo, Masimo,et al."Alpine Tethys closure as revealed by amphibole-rich mafic and ultramafic rocks from the Adamello and the Bergell intrusions (Central Alps)".JOURNAL OF THE GEOLOGICAL SOCIETY 171.6(2014):793-799.