| 1 | The age of the Gaojiacun mafic-ultramafic intrusive complex in the Yanbian area,Sichuan Province: Geochronological constraints by U-Pb dating of single zircon grains and ^(40)Ar/^(39)Ar dating of hornblende显示文摘The Gaojiacun mafic-uitramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticaccumulating cycles. Systematic U-Pb dating of single zircongrains and ^40Ar/^39Ar dating of hornblende were conducted,and the results showed that the age of hornblende gabbro,which was formed at the main phase of intrusion of the Gao-jiacun intrusive complex, is 840±5 Ma, casting doubt on theconcept of 'Yanbian Ophiolite'. It is believed that the for-mation of the Gaojiacun intrusive complex seems to be re-lated to a super-mantle plume underneath the su-per-continent Rodinia. The above research results are helpfulfor us to get a better understanding of the characteristics ofNeoproterozoic tectonic evolution of the Yanbian area inSichuan Province. | ZHUWeiguang DENGHailin LIUBingguang LIChaoyang QINYu LUOYaonan LIZhide PIDaohui | 2004 | Chinese Science Bulletin2004，49，10： | 18 |
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