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Late Paleoproterozoic Geodynamic Transition of the Central Tectonic Zone, North China Craton: Constraints from the geochemistry of granitoids in Lüliangshan Precambrian block

Late Paleoproterozoic Geodynamic Transition of the Central T...

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2004年全国岩石学与地球动力学研讨会

作者： Shuwen Liu Qingning Dang Yueran Wang (Chaohui Liu Qingnig Li Libing Gu and Bin Yang) (School of Earth and Space Sciences, Peking University, Beijing: 100871)

Lüliangshan Paleoproterozoic metamorphic block is situated in the western margin of middle segment of Central Tectonic Zone, North China Craton. A lot of Paleoproterozoic intrusions, comprising monzodioritic to granitic intrusions, are distributed in the Precambrian block. Representative Jiehekou monzodiorite to monzonite intrusion (>2150 Ma), chijianling complex (2152 to 2050Ma) and guandishan complex (2031～1906Ma) are chosen to be used to analyze the late Paleoproterozoic geodynamic evolution. Jiehekou intrusion comprises two major lithologies of monzodiorites and monzonites, and their geochemistry characteristics imply that they could be derived from crust-mantle mixed sources under back-arc tectonic setting. chijianling complex have more complex components of major monzogranites, secondary syenogranites and quartz syenites. They are characterized by KO enrichment, obvious negative Eu, Nb, P, Ti and Sr anomalies, and also relative higher εNd (t)=-1.12～-1.54, suggesting they could be produced by partial melting of back-arc and volcanic arc materials under a tectonic transitional geodynamic process from early extension to late starting compression. The guandishan complex consists of granodiorite to monzogranites with earlier and later magmatic stages, all of these granitoids exhibits higher total REE concentrations, (La/Yb)n, and significant LILEs-enriched and negative Eu, Nb, Sr, P and Ti anomalies, but very low Sr/Y values, lower εNd (t)=-2.58～-5.67. These geochemical features suggest that they could be produced by partial melting of major upper continent crustal materials under <1.2 Gpa thermal conditions and under the syn- or late-orogenic geodynamic processes, representing a typical compression tectonic environment from～2000 to 1900Ma. Integrated with studies in the geochemistry and their petrogenesis, later Paleoproterozoic igneous plutons could well record the tectonic trasitional geodynamic processes from ～2150 Ma tectonic extension, through 2150-2000 Ma tr

关键词： Jiehekou intrusion chijianling and guandishan complexes geochemistry and Nd isotope composition geodynamic transition Lüliangshan Paleoproterozoic metamorphic block Central Tectonic Zone North China Craton

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