DOI: 10.1016/j.earscirev.2020.103089
论文题名: The Rio Apa Terrane reviewed: U[sbnd]Pb zircon geochronology and provenance studies provide paleotectonic links with a growing Proterozoic Amazonia
作者: Teixeira W. ; Cordani U.G. ; Faleiros F.M. ; Sato K. ; Maurer V.C. ; Ruiz A.S. ; Azevedo E.J.P.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 202 语种: 英语
中文关键词: Amazonian Craton
; LIP
; Paleo- to Mesoproterozoic evolution
; Rio Apa Terrane
; U-Pb zircon ages and sedimentary provenance
英文关键词: accretion
; argon-argon dating
; collision
; crustal structure
; geochronology
; granitoid
; orogeny
; provenance
; tectonics
; terrain
; uranium-lead dating
; zircon
; Apa River
; Brazil
; Brazilian Shield
英文摘要: New and compiled data of zircon U-Pb ages and geochemical-isotopic constraints provide new insights into the orogenic evolution of the Rio Apa Terrane (RAT) and its close affinity with the Amazonia throughout the Proterozoic. Two terranes with distinct evolutionary histories built the RAT. The Porto Murtinho (2070–1940 Ma) and Amoguijá (1870–1820 Ma) magmatic arcs generated the Western Terrane which is mainly composed of short-lived crustal components. Granitoid rocks (1870 Ma) in the distal Corumbá Window indicate that the RAT is much larger in extent. The Caracol accretionary arc (1800–1740 Ma) and the associated Alto Tererê back-arc basin formed away from the Amoguijá belt, being roughly coeval with the adjoining Baía das Garças suite (1776 Ma) and Paso Bravo granitoid rocks (1774–1752 Ma). These tectonic units constitute the Eastern Terrane, whilst the Nd[sbnd]Hf isotopic constraints indicate derivation from a predominantly juvenile magma source with the minor input of crustal-derived contaminants. The youngest detrital zircon grains from the Alto Tererê samples gave 1740–1790 Ma ages and unimodal age spectra were mainly present. The basin infill was, therefore, most likely concomitant with the exhumation of the Caracol belt. Alto Tererê provenance study also included detritus from passive to active margin settings. The RAT underwent regional cooling between 1.35 and 1.27 Ga, documented mainly by 40Ar[sbnd]39Ar and K[sbnd]Ar ages. This age pattern matches a collisional episode that formed the accretionary margin of Amazonia, suggesting that the RAT was a close neighbor at Ectasian times. The geodynamic interplay between them lasted until 1.1 Ga ago, highlighted by some shared-components of a LIP event. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166271
Appears in Collections: 气候变化与战略
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作者单位: Institute of Geosciences, University of São Paulo, Brazil; Department of Geology, School of Mines, Federal University of Ouro Preto, Brazil; Faculty of Geosciences, Federal University of Mato Grosso, Brazil; Brazilian Geologic Survey, CPRM, Brazil
Recommended Citation:
Teixeira W.,Cordani U.G.,Faleiros F.M.,et al. The Rio Apa Terrane reviewed: U[sbnd]Pb zircon geochronology and provenance studies provide paleotectonic links with a growing Proterozoic Amazonia[J]. Earth Science Reviews,2020-01-01,202