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Zircon U-Pb geochronology and geochemistry of Gushanzi basic-ultrabasic rocks in eastern Hebei, China
WANG Ye, LI Bi-le, WU Qiong, WANG Guo-zhi
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract:

Based on the study of petrography, zircon U-Pb chronology and geochemical data, the authors determined the formation age, petrogenesis and tectonic setting for the basic-ultrabasic complex from Gushanzi. The complex is mainly composed of pyroxenite and hornblende pyroxenite. The geochemical analysis results show that the complex is enriched in MgO (4.54%~13.25%), low in SiO2 (34.28%~49.22%), and K2O>Na2O, which belong to alkaline series. Chondrite-normalized rare-earth element pattern shows that the rocks are enriched in light rare-earth element, the ratio of (La/Yb)N=8.14��36.19, with light Eu anomalies. These rocks are characterized by enrichment in LILE (Rb, Ba,K)and LREE(La, Ce), relatively depletion in HFSE(Nb, Ta, Ti)and HREE. The ratios of Nb/U, Ce/Pb and La/Sm indicate that the complex experienced limited crustal contamination. LA-ICP-MS U-Pb dating results of zircons from Gushanzi complex can be separated into three groups. The first group is with U-Pb age of(1 392±10)Ma, which is detrital zircons captured during the emplacement of ultrabasic intrusion. The second group is with U-Pb age of (274.5±2.1)Ma, representing the formation age of ultrabasic rocks. The third group is with U-Pb age of (53.02±1.1)Ma, which are typical hydrothermal zircons. These rocks are derived from partial melting of depleted mantle wedge modified by subduction-related fluids from the subduction of Paleo-Asian Ocean crust during Paleozoic and crustal contamination. Combined with the research of regional tectonic evolution, the authors conclude that the complex was formed after the closure of the Paleo-Asian Ocean in a tectonic setting of transition from compression to extension.

Keywords: geochemistry   isotope   chronology   tectonic setting   Gushanzi   Hebei  
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DOI: 10.3969/j.issn.1004-5589.2017.02.011
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