Petrogenesis of Quartz Diorite in the Datian Complex, Western Yangtze Block: Evidence from U-Pb Geochronology, Geochemistry, and Sr-Nd-Hf Isotopes
Source abstract
Abstract
This study presents integrated zircon U-Pb geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopic investigations of quartz diorite and gneissic quartz diorite from the Datian Complex along the western Yangtze Block, elucidating their petrogenesis and tectonic implications. Key findings reveal: (1) The crystallization ages of the Datian Complex (~770–755 Ma) record episodic magmatic activity over a ~16 Ma period, indicating a multi-stage tectonic evolution; (2) Both rock types exhibit intermediate SiO2 (57–64.58 wt.%), high Al2O3 (15.44–17.80 wt.%), and MgO (2.18–3.67 wt.%; Mg# = 47.41–52.65) with calc-alkaline signatures (Na2O/K2O = 1.14–2.65), coupled with adakitic traits including pronounced LREE/HREE fractionation (LaN/YbN = 3.83–26.4), negative Eu anomalies (δEu = 0.61–1.05), elevated Sr (372–701 ppm), and Sr/Y ratios (24.6–56.2), collectively classifying the complex as high-Si adakite; (3) The isotopic homogeneity (whole-rock Sr-Nd: 87Sr/86Sr(i) = 0.7038–0.7048, εNd(t) = −1.5 to–3.8; zircon Hf: εHf(t) = 1.24–6.88) supports a two-stage petrogenetic model involving partial melting of subducted oceanic slab, followed by mantle wedge metasomatism during magma ascent. These results position the Datian Complex as a Neoproterozoic arc-related adakitic magmatic system within the active continental margin of the Yangtze Block.
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Research context
OpenAlex topics: Geological and Geochemical Analysis · Nuclear materials and radiation effects · Mineralogy and Gemology Studies
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Affiliations
College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, China
No. 280 Research Institute of Nuclear Industry, Guanghan 618300, China
Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province, Chengdu University of Technology, Chengdu 610059, China
Beijing Institute of Geology of Nuclear Industry, Beijing 100029, China
Land and Resources Research Center, Mianyang Normal University, Mianyang 621000, China
Funding
National Natural Science Foundation of China · Sichuan Science and Technology Program · Scientific Research Project of Mianyang Normal University · Opening Fund of Provincial Key Lab of Applied Nuclear Techniques in Geosciences
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