Late Mesozoic magmatism from the Daye region, eastern China: U-Pb ages, petrogenesis, and geodynamic implications

Li, Jian-Wei, Zhao, Xin-Fu, Zhou, Mei-Fu, Ma, Chang-Qian, de Souza, Zorano Sérgio and Vasconcelos, Paulo (2009) Late Mesozoic magmatism from the Daye region, eastern China: U-Pb ages, petrogenesis, and geodynamic implications. Contributions To Mineralogy And Petrology, 157 3: 383-409. doi:10.1007/s00410-008-0341-x


Author Li, Jian-Wei
Zhao, Xin-Fu
Zhou, Mei-Fu
Ma, Chang-Qian
de Souza, Zorano Sérgio
Vasconcelos, Paulo
Title Late Mesozoic magmatism from the Daye region, eastern China: U-Pb ages, petrogenesis, and geodynamic implications
Journal name Contributions To Mineralogy And Petrology   Check publisher's open access policy
ISSN 0010-7999
Publication date 2009-03
Year available 2008
Sub-type Article (original research)
DOI 10.1007/s00410-008-0341-x
Volume 157
Issue 3
Start page 383
End page 409
Total pages 27
Editor T.L. Grove
J. Hoefs
Place of publication Germany
Publisher Springer
Collection year 2009
Language eng
Subject 040303 Geochronology
970104 Expanding Knowledge in the Earth Sciences
C1
Abstract Late Mesozoic dioritic and quartz dioritic plutons are widespread in the Daye region, eastern Yangtze craton, eastern China. Detailed geochronological, geochemical, and Sr–Nd isotopic studies have been undertaken for most of these plutons, in an attempt to provide a comprehensive understanding in the age, genesis and geodynamical control of the extensive magmatism. SHRIMP and LA-ICP-MS zircon U–Pb dating indicate that the plutons were emplaced in the range of latest Jurassic (ca. 152 Ma) to early Cretaceous (ca. 132 Ma), which was followed by dyke emplacement between 127 and 121 Ma and volcanism during the 130–113 Ma interval. Both diorites and quartz diorites are sodic, metaluminous, high-K calc-alkaline, and characterized by strongly fractionated, sub-parallel REE patterns without obvious Eu anomalies. The rocks are enriched in highly incompatible elements and large ion lithophile elements, but depleted in high field strength elements. Samples of diorite and quartz diorite have similar Sr–Nd isotopic compositions that are consistent with the early Cretaceous basalts and mafic intrusions throughout the eastern Yangtze craton. The geochemical and isotopic data, together with results of geochemical modeling, indicate an enriched mantle source for the plutonic rocks. The quartz diorites have geochemical signatures resembling adakites, such as high Al2O3 (15–19 wt.%), Sr (630–2,080 ppm), Na2O (>3.5 wt.%), negative Nb–Ta anomalies, low Y (7–19 ppm), Yb (0.5–1.8 ppm), Sc (5–15 ppm), and resultant high Sr/Y (45–200) and La/Yb (31–63) ratios. Genesis of the adakitic quartz diorites is best explained in terms of low-pressure intracrustal fractional crystallization of cumulates consisting of hornblende, plagioclase, K-feldspar, magnetite, and apatite from mantle-derived dioritic magmas. Mantle-derived magmatism broadly coeval with that of the Daye region also is widespread in other regions of the eastern Yangtze craton, reflecting large-scale melting of the lithospheric mantle during the Late Mesozoic. The large-scale magmatism was most likely driven by lithospheric extension associated with thinning of lithospheric mantle beneath the eastern China continent.
Keyword Adakite
Fractional Crystallization
Partial melting
Lithospheric extension
Yangtze craton
Eastern China
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Published online: 20 September 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Earth Sciences Publications
 
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Created: Fri, 17 Apr 2009, 17:34:28 EST by Ms Christine Sinclair on behalf of School of Earth Sciences