干旱区生态环境知识资源中心(Arid): Tephrochronology and chronostratigraphy of the Miocene Chilcatay and Pisco formations (East Pisco Basin, Peru)

Arid

DOI	10.1127/nos/2019/0525
	Tephrochronology and chronostratigraphy of the Miocene Chilcatay and Pisco formations (East Pisco Basin, Peru)
	Bosio, Giulia 1; Malinverno, Elisa 1; Villa, Igor Maria 1,2; Di Celma, Claudio 3; Gariboldi, Karen 4; Gioncada, Anna 4; Barberini, Valentina 1; Urbina, Mario 5; Bianucci, Giovanni 4
通讯作者	Bosio, Giulia
来源期刊	NEWSLETTERS ON STRATIGRAPHY
ISSN	0078-0421
出版年	2020
卷号	53 期号:2 页码:213-247
英文摘要	Strata of Chilcatay and Pisco formations exposed in the Ica Desert (East Pisco Basin, southern Peru) preserve one of the most complete and rich records of Miocene marine vertebrates of the world. Despite its exceptional importance, the chronostratigraphy of these fossil-bearing deposits has been only sporadically studied in the literature until recently. This work presents a detailed reconstruction of the chronostratigraphic framework, achieved by mapping and logging of seven sections of the Miocene Chilcatay and Pisco formations along the western side of the Ica River. The Chilcatay Formation consists of two allomembers, namely Ct1 and Ct2, bounded at the base by unconformities CE0.1 and CE0.2, respectively. Similarly, the immediately overlying Pisco Formation is divided into allomembers P0, P1, and P2, bounded at the base by unconformities PE0.0, PE0.1 and PE0.2, respectively. The new Ar-39-Ar-4(0) results presented here, combined with ages of previous work, provide precise constraints on the age of several stratigraphically referenced volcanic ash layers intercalated in the studied fossil-bearing succession, placing its vertebrate fossil fauna within a refined temporal framework and laying the solid ground for its detailed regional and global comparison. The ages of the allomembers, and thus their associated faunas, can be reliably estimated by the combination of Ar-39-Ar-40 dating on tephra layers with diatom biostratigraphy. In the study area, the two methods are mutually consistent and constrain the deposition of the Chilcatay Formation between 19.2 and 18.0 Ma, that of P1 between 9.5 and 8.6 Ma, and that of P2 between 8.4 and 6.7 Ma. In the absence of direct dating of the P0 allomember, which lacks both preserved tephra suitable for Ar-39-Ar-40 dating and microfossils, its age can be constrained to the temporal gap between the youngest age available from the underlying Chilcatay strata (18.0 Ma) and the oldest age available from the overlying P1 strata (9.5 Ma).
英文关键词	tephrochronology tephrostratigraphy Ar-39-Ar-40 dating biostratigraphy Miocene Pisco Basin
类型	Article
语种	英语
国家	Italy ; Peru
收录类别	SCI-E
WOS记录号	WOS:000541129400004
WOS关键词	FOSSIL MARINE VERTEBRATES ; AR-40/AR-39 GEOCHRONOLOGY ; CERRO COLORADO ; FORE-ARC ; NEOGENE ; STRATIGRAPHY ; RECORD ; PALEONTOLOGY ; PRESERVATION ; ODONTOCETI
WOS类目	Geology
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/2XILL650/319714
作者单位	1.Univ Milano Bicocca, Dipartimento Sci Ambiente & Terra, I-20126 Milan, Italy; 2.Univ Milano Bicocca, Ctr Univ Dataz & Archeometria, I-20126 Milan, Italy; 3.Univ Camerino, Scuola Sci & Tecnol, I-62032 Camerino, Italy; 4.Univ Pisa, Dipartimento Sci Terra, I-56126 Pisa, Italy; 5.Univ Nacl Mayor San Marcos, Museo Hist Nat, UNMSM, Dept Paleontol Vertebrados, Lima 1, Peru
推荐引用方式 GB/T 7714	Bosio, Giulia,Malinverno, Elisa,Villa, Igor Maria,et al. Tephrochronology and chronostratigraphy of the Miocene Chilcatay and Pisco formations (East Pisco Basin, Peru)[J],2020,53(2):213-247.
APA	Bosio, Giulia.,Malinverno, Elisa.,Villa, Igor Maria.,Di Celma, Claudio.,Gariboldi, Karen.,...&Bianucci, Giovanni.(2020).Tephrochronology and chronostratigraphy of the Miocene Chilcatay and Pisco formations (East Pisco Basin, Peru).NEWSLETTERS ON STRATIGRAPHY,53(2),213-247.
MLA	Bosio, Giulia,et al."Tephrochronology and chronostratigraphy of the Miocene Chilcatay and Pisco formations (East Pisco Basin, Peru)".NEWSLETTERS ON STRATIGRAPHY 53.2(2020):213-247.