High-precision late Aptian Pb/U age for the Punta del Barco Formation (Baquero Group), Santa Cruz Province, Argentina

被引：45

作者：

Cesari, Silvia N. ^{[1
]}

Limarino, Carlos O. ^{[2
]}

Llorens, Magdalena ^{[3
]}

Passalia, Mauro G. ^{[4
]}

Perez Loinaze, Valeria ^{[1
]}

Vera, Ezequiel I. ^{[1
,2
]}

机构：

[1] Museo Argentino Ciencias Nat Bernardino Rivadavia, Buenos Aires, DF, Argentina

[2] Univ Buenos Aires, Dept Geol, RA-1428 Buenos Aires, DF, Argentina

[3] Comis Nacl Energia Atom, RA-9100 Trelew, Chubut, Argentina

[4] CONICET UNCo, Inst Invest Biodiversidad & Medioambiente, San Carlos De Bariloche, Argentina

来源：

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES | 2011年 / 31卷 / 04期

关键词：

Cretaceous; Aptian; Paleobotany; Geochronology; Patagonia; SOUTH SHETLAND ISLANDS; U-PB; CRETACEOUS FLORA; BYERS PENINSULA; PATAGONIA; GEOCHRONOLOGY; STRATIGRAPHY;

D O I：

10.1016/j.jsames.2011.03.012

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Baquero Group holds a rich fossil flora including macrofloristic and palynological remains that characterize the Early Cretaceous vegetation of Argentina. The age of the upper part of the Group, known as Punta del Barco Formation, has been a topic of several discussions in the past. The type locality of this stratigraphic unit exposes fossiliferous tuffs together with muddy tuffs and tuffaceous sandstones beds. However, there have been no reliable age constraints for the fossil assemblages. Pb-206/U-238 analyses of zircon crystals yielded an age of 114.67 +/- 0.18 Ma. This age control makes possible an improved analysis and comparison of the floras in the southern region. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：426 / 431

页数：6

共 53 条

[1] CUTICULAR CHARACTERS ADAPTED TO VOLCANIC STRESS IN A NEW CRETACEOUS CYCAD LEAF FROM PATAGONIA, ARGENTINA - CONSIDERATIONS ON THE STRATIGRAPHY AND DEPOSITIONAL HISTORY OF THE BAQUERO FORMATION [J].

ARCHANGELSKY, A ;

ANDREIS, RR ;

ARCHANGELSKY, S ;

ARTABE, A .

REVIEW OF PALAEOBOTANY AND PALYNOLOGY, 1995, 89 (3-4) :213-233

[2]

Archangelsky S., 2003, MONOGRAFIAS MUSEO AR, P14

[3]

Archangelsky S., 2001, PUBLICACION ASOCIACI, V7, P15

[4]

Archangelsky S., 1967, REV MUSEO PLANTA NUE, V7, P185

[5]

Archangelsky S., 2004, ACT 5 S ARG 1 LAT IN

[6]

Archangelsky S., 1984, AMEGHINIANA, V21, P5

[7] Early angiosperm diversification: evidence from southern South America [J].

Archangelsky, Sergio ;

Barreda, Viviana ;

Passalia, Mauro G. ;

Gandolfo, Maria ;

Pramparo, Mercedes ;

Romero, Edgardo ;

Cuneo, Ruben ;

Zamuner, Alba ;

Iglesias, Ari ;

Llorens, Magdalena ;

Puebla, Gabriela G. ;

Quattrocchio, Mirta ;

Volkheimer, Wolfgang .

CRETACEOUS RESEARCH, 2009, 30 (05) :1073-1082

[8]

Askin RA., 1983, Antarctic Earth Science, P295

[9] POLEWARD MIGRATION OF EARLY ANGIOSPERM FLORA [J].

AXELROD, DI .

SCIENCE, 1959, 130 (3369) :203-207

[10]

Berry EW, 1924, AM J SCI, V7, P473

← 1 2 3 4 5 6 →