DOI: 10.1007/s00531-013-0912-6
Scopus记录号: 2-s2.0-84885907974
论文题名: Zircon U-Pb ages and O-Nd isotopic composition of basement rocks in the North Qinling Terrain, central China: Evidence for provenance and evolution
作者: Liu B.-X. ; Qi Y. ; Wang W. ; Siebel W. ; Zhu X.-Y. ; Nie H. ; He J.-F. ; Chen F.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 8 起始页码: 2153
结束页码: 2173
语种: 英语
英文关键词: North Qinling
; O-Sr-Nd isotopes
; Precambrian
; Provenance
; Zircon
Scopus关键词: age determination
; amphibolite
; basement rock
; crustal evolution
; gneiss
; island arc
; isotopic composition
; metamorphism
; neodymium isotope
; oxygen isotope
; Precambrian
; provenance
; strontium isotope
; tectonic evolution
; uranium-lead dating
; zircon
; China
; North China Block
; Qinling Mountains
; South China Block
英文摘要: The Qinling Group was previously interpreted as the oldest Precambrian basement unit of the North Qinling Terrain, recording its formation and early crustal evolution. The Qinling Group consists predominantly of gneisses, amphibolites, and marbles, which underwent multi-phase deformation and metamorphism. In order to better constrain the provenance and tectonic setting of this group and the evolution of the North Qinling orogenic belt, in situ U-Pb dating and oxygen isotopic analysis of zircons in combination with whole-rock geochemistry and Sr-Nd isotope analysis was performed on the two dominant rock types, amphibolite and felsic gneiss. Felsic gneisses exhibit enrichment of LREEs and LILEs (Rb, Ba, Th, K, Pb), negative Eu anomalies and depletion of HFSEs (Nb, Ta, P, Ti). The rocks have slightly elevated δ18O values (6.5-9.3 ‰) and initial ε Nd values of -4.6 corresponding to two-stage Nd model age of 1.99 Ga. Amphibolites are also enriched in LILEs and LREEs and depleted in Nb and Ta and have homogeneous δ18O values (5.0-6.0 ‰), but higher initial ε Nd values (2.8-3.3) and younger two-stage Nd model ages (1.29-1.24 Ga) compared to the gneisses. The zircon age record indicates that the gneisses and amphibolites were formed in a ~960 Ma volcanic arc environment rather than in a rift setting as previously suggested. A major metamorphic event took place during the Early Paleozoic. Based on the age spectrum of detrital zircons, the Qinling Group is interpreted as an autonomous geological unit, which was mainly derived mostly from 1,000 to 900 Ma old granitoid rocks. The North Qinling Terrain can be regarded as a remnant of the Grenville orogenic belt with an early Neoproterozoic evolution different from that of the North and South China blocks. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885907974&doi=10.1007%2fs00531-013-0912-6&partnerID=40&md5=56881f7d21af667e5a467f8ac0478aab
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70494
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, 710069, China; Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China; Department of Geosciences, University of Tübingen, 72074 Tübingen, Germany; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
Recommended Citation:
Liu B.-X.,Qi Y.,Wang W.,et al. Zircon U-Pb ages and O-Nd isotopic composition of basement rocks in the North Qinling Terrain, central China: Evidence for provenance and evolution[J]. International Journal of Earth Sciences,2013-01-01,102(8)