DOI: 10.1007/s00531-013-0908-2
Scopus记录号: 2-s2.0-84881610294
论文题名: Age and magnetic fabric of the Três Córregos granite batholith: Evidence for Ediacaran transtension in the Ribeira Belt (SE Brazil)
作者: Salazar C.A. ; Archanjo C.J. ; Rodrigues S.W.D.O. ; Hollanda M.H.B.M. ; Liu D.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 6 起始页码: 1563
结束页码: 1581
语种: 英语
英文关键词: Anisotropy of magnetic susceptibility
; Granite
; Ribeira belt
; SE Brazil
; U-Pb zircon geochronology
Scopus关键词: batholith
; continental arc
; Ediacaran
; emplacement
; fluorite
; geochronology
; host rock
; magnetic anisotropy
; magnetic fabric
; metasedimentary rock
; pluton
; SHRIMP dating
; strain rate
; strike-slip fault
; upper crust
; uranium-lead dating
; zircon
; Brazil
; Ribeira Belt
英文摘要: Anisotropy of magnetic susceptibility (AMS) and U-Pb (SHRIMP) zircon ages in the eastern part of the Três Córregos batholith (Ribeira belt, SE Brazil) indicate a well-defined fabric pattern acquired between 600 and 595 Ma. The batholith consists mostly of porphyritic granites distributed in the Ribeirão Branco, Barra do Chapéu and Itaóca plutons. Late fluorite-bearing alkaline granites, some containing Sn-polymetallic greisen-type deposits, intruded the Ribeirão Branco pluton and the low-grade metasedimentary host rocks. The magnetic fabric of the Ribeirão Branco granite is dominantly oblate and oblique to the pluton elongation while that in Barra do Chapéu is mostly concentric. On both plutons, AMS records the preferred orientation of coarse, homogeneous Ti-poor magnetite grains. Such fabric patterns indicate a partitioned strain field dominated by strike-slip left-lateral shear deformation in the Ribeirão Branco and extension in the Barra do Chapéu pluton. The zircon ages of these plutons are 600 ± 6 Ma and 595 ± 4 Ma. Likewise, the ages of alkaline plutons were in the range of 597 and 595 Ma, registering a fast transition between the typical syntectonic batholithic magmatism to the late, highly evolved and specialized magmas. These results indicate that the Ribeira belt was deformed by transtension in the Middle Ediacaran. The geological setting is consistent with a continental arc with the Três Córregos batholith emplacing at the middle-upper crust. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881610294&doi=10.1007%2fs00531-013-0908-2&partnerID=40&md5=e80daa21e3772cedb59af2597fbc5dff
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70520
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, São Paulo, SP, 05508-080, Brazil; Universidade Federal do Amazonas, ICE, Manaus, AM, 69077-000, Brazil; Faculdade de Geologia, Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, 20550-900, Brazil; Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing, 10037, China
Recommended Citation:
Salazar C.A.,Archanjo C.J.,Rodrigues S.W.D.O.,et al. Age and magnetic fabric of the Três Córregos granite batholith: Evidence for Ediacaran transtension in the Ribeira Belt (SE Brazil)[J]. International Journal of Earth Sciences,2013-01-01,102(6)