U–Pb SHRIMP zircon dating of Grenvillian metamorphism in Western Sierras Pampeanas (Argentina): Correlation with the Arequipa-Antofalla craton and constraints on the extent of the Precordillera
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- 作者：Cesar Casquet ; Robert J. Pankhurst ; C. Mark Fanning ; Edgardo Baldo ; Carmen Galindo ; Carlos W. Rapela ; Jose M. Gonzá ; lez-Casado ; Juan A. Dahlquist
- 关键词：Sierras Pampeanas ; Argentina ; Metamorphism ; U– ; Pb SHRIMP zircon dating ; Grenville
- 刊名：Gondwana Research
- 出版年：2006
- 出版时间：June 2006
- 年：2006
- 卷：9
- 期：4
- 页码：524-529
- 全文大小：1225 K
文摘
Metamorphism of Grenvillian age (ca. 1.2 Ga; U–Pb zircon dating) is recognized for the first time in the Western Sierras Pampeanas (Sierra de Maz). Conditions reached granulite facies (ca. 780 °C and ca. 780 MPa). Comparing geochronological and petrological characteristics with other outcrops of Mesoproterozoic basement, particularly in the northern and central Arequipa-Antofalla craton, we suggest that these regions were part of a single continental crustal block from Mesoproterozoic times, and thus autochthonous or parautochthonous to Gondwana.