High-precision U-Pb zircon age from the Anfiteatro de Tico Formation: Implications for the timing of the early angiosperm diversification in Patagonia

被引：36

作者：

Perez Loinaze, Valeria S. ^{[1
,5
]}

Vera, Ezequiel I. ^{[1
,2
,5
]}

Passalia, Mauro G. ^{[3
,5
]}

Llorens, Magdalena ^{[4
,5
]}

Friedman, Richard ^{[6
]}

Limarino, Carlos O. ^{[2
,5
]}

Cesari, Silvia N. ^{[1
,5
]}

机构：

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

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

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

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

[5] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

[6] Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Pacific Ctr Isotop & Geochem Res, Vancouver, BC V6T 1Z4, Canada

来源：

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES | 2013年 / 48卷

关键词：

Cretaceous; Aptian; Palynology; Paleobotany; Angiosperms; Geochronology; Baquero Group; Patagonia; SANTA-CRUZ PROVINCE; BAQUERO-GROUP; POLLEN; BASIN; FLORA; GEOCHRONOLOGY;

D O I：

10.1016/j.jsames.2013.08.005

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Baquero Group is one of the most relevant units regarding the study of the early diversification of angiosperms in South America. Whereas the age of the upper part of the Group, namely the Punta del Barco Formation, has been recently dated at 114.67 +/- 0.18 Ma, the rest of the unit still lacks precise dating. In this contribution a CA-TIMS U-Pb zircon age of 118.23 +/- 0.09 Ma for a tuff interlayered with fossiliferous rocks of the Anfiteatro de Tico Formation (lower part of the Baquero Group) is reported. This age constrains the duration of deposition of the Baquero Group to approximately 4 Ma and provides new evidence for the age interpretation of the previously described angiosperm flora and associated pollen assemblages from this unit, until now interpreted as early Aptian or possibly Barremian in age. The Aptian age of the Baquero Group allows a better comparison between the paleofloras from this southernmost region. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：97 / 105

页数：9

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