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Guandishan Granitoids of the paleoproterozoic Lüliang Metamorphic complex in the Trans-North China Orogen:SHRIMP Zircon Ages,Petrogenesis and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 580-602页

作者： LIU Shuwen LI Qiugen LIU Chaohui LU Yongjun ZHANG Fan The Key Laboratory of Orogenic Belts and Crustal Evolution MOE School of Earth and Space Sciences Peking University Beijing 100871 China

The paleoproterozoic Liiliang Metamorphic complex （PLMC） is situated in the middle segment of the western margin of the Trans-North China Orogen （TNCO）, North China Craton （NCC）. As the most important lithological assemblages in the southern part of the PLMC, Guandishan granitoids consist of early gneissic tonalities, granodiorites and gneissic monzogranites, and younger gneissic to massive monzogranites. Petrochemical features reveal that the early gneissic tonalities and granodiorites belong to the medium-K calc-alkaline series; the early gneissic monzogranites are transitional from high-K calc-alkaline to the shoshonite series; the younger gneissic to massive monzogranites belong to the high-k calc-alkaline series, and all rocks are characterized by right- declined REE patterns and negative Nb, Ta, Sr, P, and Ti anomalies in the primitive mantle normalized spidergrams. SHRIMP zircon U-Pb isotopic dating reveals that the early gneissic tonalities and granodiorites formed at -2.17 Ga, the early gneissic monzogranites at -2.06 Ga, and the younger gneissic to massive monzogranites at -1.84 Ga. Sm-Nd isotopic data show that the early gneissic tonalities and granodiorites have eNd（t） values of ＋0.48 to -3.19 with Nd-depleted mantle model ages （TDM） of 2.76--2.47 Ga, and early gneissic monzogranites have eNd（t） values of -0.53 to -2.51 with TDM of 2.61--2.43 Ga, and the younger gneissic monzogranites have eNd（t） values of -6.41 to -2.78 with a TDM of 2.69--2.52 *** geochemical and isotopic data indicate that the early gneissic tonalities, granodiorites, and monzogranites were derived from the partial melting of metamorphosed basaltic and pelitic rocks, respectively, in a continental arc setting. The younger gneissic to massive monzogranites were derived by partial melting of metamorphosed greywackes within the continental crust. Combined with previously regional data, we suggest that the paleoproterozoic granitoid magmatism in the Guandishan granitoids of the PLMC

关键词： Guandishan granitoid petrogenesis SHRIMP zircon geochronology geochemistry Ndisotopes paleoproterozoic liiliangshan complex Trans-North China Orogen North China craton.

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