Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic

doi:10.1016/j.precamres.2018.11.004

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic
	Will, T. M.1; Gaucher, C.2; Ling, X-X 3; Li, X-H 3; Li, Q-L 3; Frimmel, H. E.1,4
刊名	PRECAMBRIAN RESEARCH
	2019
卷号	320 页码:303-322
关键词	Rodinia Gondwana Cuchilla Dionisio Terrane Cerro Olivo Complex U-Pb geochronology Ar-Ar geochronology Lu-Hf-O zircon isotope data
ISSN号	0301-9268
DOI	10.1016/j.precamres.2018.11.004
英文摘要	The Cuchilla Dionisio (or Punta del Este) Terrane of the southern Dom Feliciano Belt, eastern Uruguay, experienced a prolonged Neoproterozoic to Cambrian tectonothermal evolution. Zircon and monazite age data from orthogneisses of the basement of the terrane (Cerro Olivo Complex) provide evidence of widespread magmatism at c. 780 Ma and high-grade, up to granulite-facies metamorphism between 655 and 632 Ma. Isotope data imply that the orthogneiss protolithic melts formed in a within-plate, rift-related setting by Neoproterozoic (re-) melting of lower crustal material that was extracted from the mantle during the Palaeoproterozoic. We show that the terrane extends further north than previously thought. The presence of inherited Meso- and Palaeoproterozoic zircon grains indicates the existence of older crustal components in the terrane. The ages of the detrital zircon grains and their Hf isotope signatures cannot be explained by a Rio de la Plata Craton provenance but are consistent with a southern African Kalahari Craton origin. Ar-Ar ages of 628 and 625 Ma were obtained on magnesiohomblende in amphibolite from the northern Cuchilla Dionisio Terrane, whose protolith formed in an Ediacaran back-arc basin. These ages are interpreted as the time of amphibolite-facies metamorphism. Thus, crustal convergence between the Kalahari (or Congo?) and the Rio de la Plata Craton and subduction of the intervening oceanic basin must have been underway between 655 and 625 Ma. The early Neoproterozoic basement of the Cuchilla Dionisio Terrane is part of the southern African Namaqua Province that was separated from the Kalahari Craton during Rodinia break-up and opening of the southern Adamastor Ocean in the Tonian. Closure of this ocean in the late Cryogenian to early Ediacaran was associated with arc magmatism and high-temperature metamorphism of the Cuchilla Dionisio Terrane basement. A back arc basin formed and was closed between this arc and the western African margin. Relics of this basin were obducted onto the Cuchilla Dionisio Terrane at c. 625 Ma. Late Neoproterozoic intrusive igneous rocks from the Cuchilla Dionisio and the Coastal terranes were emplaced in a supra-subduction setting (at least in Uruguay) and have the same Hf isotope signature.
资助项目	Deutsche Forschungsgemeinschaft[Wi 1225/8] ; Chinese State Key Research and Development Program[2016YFE0203000]
WOS关键词	DE-LA-PLATA ; DOM FELICIANO BELT ; NATURAL REFERENCE MATERIAL ; AFRICAN KAOKO BELT ; U-PB AGE ; WESTERN GONDWANA ; DAMARA OROGEN ; GEOCHRONOLOGICAL CONSTRAINTS ; MANTIQUEIRA PROVINCE ; GEODYNAMIC EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000456899600018
资助机构	Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; Chinese State Key Research and Development Program ; Chinese State Key Research and Development Program
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90508]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Will, T. M.
作者单位	1.Univ Wurzburg, Inst Geog & Geol, D-97074 Wurzburg, Germany 2.Univ Republica, Fac Ciencias, Inst Ciencias Geol, Igua 4225, Montevideo 11400, Uruguay 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Univ Cape Town, Dept Geol Sci, ZA-7701 Rondebosch, South Africa
推荐引用方式 GB/T 7714	Will, T. M.,Gaucher, C.,Ling, X-X,et al. Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic[J]. PRECAMBRIAN RESEARCH,2019,320:303-322.
APA	Will, T. M.,Gaucher, C.,Ling, X-X,Li, X-H,Li, Q-L,&Frimmel, H. E..(2019).Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic.PRECAMBRIAN RESEARCH,320,303-322.
MLA	Will, T. M.,et al."Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic".PRECAMBRIAN RESEARCH 320(2019):303-322.