干旱区生态环境知识资源中心(Arid): Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes

Arid

DOI	10.1007/s00445-020-1373-y
	Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes
	Bosio, Giulia 1,2; Gioncada, Anna 1; Di Celma, Claudio 3; Villa, Gor Maria 2,4,5; Pichavant, Michel 6; Urbina, Mario 7; Bianucci, Giovanni 1
通讯作者	Bosio, Giulia
来源期刊	BULLETIN OF VOLCANOLOGY
ISSN	0258-8900
EISSN	1432-0819
出版年	2020
卷号	82 期号:6
英文摘要	Two-mica-biotite and muscovite-volcanics are particularly rare in the geological record. One of the several dozen volcanic ash layers from Central Andes volcanoes found in the upper Miocene marine succession of the Pisco Formation (Ica Desert, Peru) contains juvenile biotite and muscovite, sillimanite/andalusite, feldspars, and rhyolitic glass. Ar-39-Ar-40 dating on biotite and muscovite concordantly constrain an age of 7.96 Ma for this two-mica ash layer. A second tephra in the Pisco Formation has a similar biotite composition and an age between 7.45 and 6.93 Ma. The peculiar mineral assemblage and the chemical composition of biotite indicate a strongly peraluminous composition of the erupted magmas and, together with the Ar-39-Ar-40 ages, suggest to consider a correlation of these ash layers to the eruptions of the Miocene Macusani (Peru) or Morococala (Bolivia) volcanic complexes in the Eastern Cordillera of Central Andes. The major and trace element composition of glass supports the correlation with Macusani. A provenance from Morococala seems less likely given the large distances involved. These results provide new data on the volcanic activity of the Eastern Cordillera revealing ash that dispersed to over 500 km to the west, in the forearc marine basins. This finding highlights that the exhumed forearc East Pisco Basin is highly promising as an archive of distal ash for the reconstruction of the volcanic activity of Central Andes during the Miocene silicic flare-ups.
英文关键词	Strongly peraluminous tephra Ar-39-Ar-40 ages Miocene Central Andes Macusani Morococala
类型	Article
语种	英语
国家	Italy ; Switzerland ; France ; Peru
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000533910700001
WOS关键词	PLIOCENE MACUSANI VOLCANICS ; FOSSIL MARINE VERTEBRATES ; SE PERU ; CALC-ALKALINE ; SOUTHERN PERU ; MIOCENE ; ROCKS ; FIELD ; GEOCHRONOLOGY ; STRATIGRAPHY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319080
作者单位	1.Univ Pisa, Dipartimento Sci Terra, I-56126 Pisa, Italy; 2.Univ Milano Bicocca, Dipartimento Sci Ambiente & Terra, I-20126 Milan, Italy; 3.Univ Camerino, Scuola Sci & Tecnol, I-62032 Camerino, Italy; 4.Univ Bern, Inst Geol, CH-3012 Bern, Switzerland; 5.Univ Milano Bicocca, Ctr Univ Dataz & Archeometria, I-20126 Milan, Italy; 6.Univ Orleans, CNRS, ISTO, BRGM,UMR 7327, 1A Rue Ferollerie, F-45100 Orleans, France; 7.Univ Nacl Mayor San Marcos, Museo Hist Nat, Dept Paleontol Vertebrados, Lima 1, Peru
推荐引用方式 GB/T 7714	Bosio, Giulia,Gioncada, Anna,Di Celma, Claudio,et al. Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes[J],2020,82(6).
APA	Bosio, Giulia.,Gioncada, Anna.,Di Celma, Claudio.,Villa, Gor Maria.,Pichavant, Michel.,...&Bianucci, Giovanni.(2020).Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes.BULLETIN OF VOLCANOLOGY,82(6).
MLA	Bosio, Giulia,et al."Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes".BULLETIN OF VOLCANOLOGY 82.6(2020).