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A Cambrian intra-oceanic subduction system in the Bozshakol area,Kazakhstan

A Cambrian intra-oceanic subduction system in the Bozshakol ...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Ping Shen Hongdi Pan Eleonora Seitmuratova Feng Yuan Sholpan Jakupova Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth Sciences Chang'an University

The Bozshakol area is one of the most important copper resource concentrations in Central *** report in situ zircon U–Pb age and hf isotope data,whole rock geochemical and sr–nd isotopic data for the volcanics and intrusions from the Bozshakol *** ion mass spectrometry(SIMS) zircon U–Pb dating indicates that the volcanics erupted at 501.8 ±3.2 Ma and the intrusions emplaced at 489.5 ± 3.3 *** volcanics are subdivided into two *** I are tholeiitic to calc-alkaline basalt and calc-alkaline andesite and dacite,which are enriched in light rare earth elements(LREE) with a marked negative Nb anomaly and Th/*** also have low initialsr/ sr ratios(0.7026–0.7048),high zircon εhf(t) and whole-rock εnd(t) values(+ 9.7 to + 17.0 and + 5.4to + 6.7,respectively).Type II are Nb-enriched basalts(NEBs,Nb = 6–7 ppm),which are sodium-rich(NaO/K O = 3–10) and differ from the vast majority of arc basalts in their higher Nb,Zr,and Ti O contents and Nb/U *** also have low whole-rock initialsr/ sr ratios(0.7040) and high εnd(t) values(+5.6).Therefore Bozshakol volcanics were formed by partial melting of the mantle wedge and subducted *** Bozshakol ore-bearing intrusive rocks include the fine-and medium-grained tonalite *** belong to the medium-K calc-alkaline series and are strongly enriched in LREE with a marked negative Nb anomaly and Th/*** fine-grained tonalite porphyries exhibit element characteristics similar to normal arc *** have low initialsr/ sr ratios(0.7036–0.7039),high zircon εhf(t) values(+10.7 to + 17.2)and whole-rock εnd(t) values(+ 4.9 to + 5.7).Compared with the fine-grained tonalite porphyries,the medium-grained tonalite porphyries have high AlO and sr contents(16–17 wt.% and 565–569 ppm,respectively)and low Yb and Y concentrations(0.9–1.1 ppm and 9.3–12.1 ppm,respectively),showing a geochemical affinity to ***,Bozshakol intrusive rocks were also derived from the m

关键词： Zircon U–Pb age sr–nd–hf isotopes Nb-enriched basalt Adakitic rocks Bozshakol Kazakhstan

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