|Table of Contents|

Paleo-Pacific Subduction in Early Jurassic: Geochronological and Geochemical Evidences of Gabbros in Helong Area of Yanbian, Jilin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第06期
Page:
819-832
Research Field:
非主题来稿
Publishing date:

Info

Title:
Paleo-Pacific Subduction in Early Jurassic: Geochronological and Geochemical Evidences of Gabbros in Helong Area of Yanbian, Jilin, China
Author(s):
ZHANG Chao1; 2;  WANG Lu-yuan1;  GENG Rui3;  LIU Zheng-hong2; 4;  ZHANG Le-tong5
1. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255000, Shandong, China; 2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130026, Jilin, China; 3. Shandong Gold Group Co. Ltd., Jinan 250101, Shandong, China; 4. College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China; 5. Heilongjiang Institute of Geophysical and Geochemical Exploration, Harbin 150036, Heilongjiang, China
Keywords:
gabbro;  zircon U-Pb age;  Hf isotope;  Early Jurassic;  active continental margin;  paleo-Pacific plate;  the southern Xing-Meng orogenic belt;  Jilin
PACS:
P581; P597
DOI:
10.19814/j.jese.2020.08019
Abstract:
Yanbian area in Jilin, located at the eastern segment of the southern Xing-Meng orogenic belt, is an overlapped and transformed area between the paleo-Asian ocean and paleo-Pacific ocean tectonic domains. In order to confirm the emplaced age and discuss the petrogenesis and tectonic setting of Shasongdizi gabbros in Helong area of Yanbian, Jilin, the petrography, zircon U-Pb geochronology, Hf isotopic data and geochemistry of the gabbros were analyzed. The results show that the emplaced age of Shasongdingzi gabbro is in late Early Jurassic with the weighted mean age of(175.6±1.1)Ma; gabbros are characterized by the low SiO2 contents and high Al2O3 contents, while the samples have high Cr, Ni, V, Co, Sc contents and Mg# values; meanwhile, the ratios of Zr/Hf and Ba/Rb are similar to the ones of mantle igneous rocks, the ratios of Nb/U are similar to the ones of continental crust, indicating that the continental contamination occurs during evolution; gabbros have low total REE contents and positive Eu anomaly; all the samples are slightly enriched in LREE and enriched in LILE such as Cs, K, Sr, and depleted in HFSE such as Nb and Ta. The geochemical features suggest that the gabbros have subduction-reformed lithospheric mantle-derived primary magma contaminated by upper crustal materials during evolution. The gabbros have depleted Hf isotopic compositions with εHf(t)of 2.5-7.0. In summary, the primary magma of gabbros may be from the depleted mantle, which is metasomatized by fluids from subducted oceanic slab and is contaminated by the crustal materials. Furthermore, the Shasongdingzi gabbros form in an active continental margin during the subduction of paleo-Pacific.

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