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K-Ar Geochronology of Mesozoic Mafic Dikes in Shandong Province, Eastern China: Implications for Crustal Extension

Acta Geologica Sinica(English Edition) 2004年第6期78卷 1207-1213页

作者： LIUShen HURuizhon zhaojunhong FENGCaixia InstituteofGeochemistry ChineseAcademyofSciencesGuiyangGuizhou550002

Based on K-Ar isotope analyses, Mesozoic mafic (and alkali ultramafic) dikes from western and eastern Shandong Province, China, are dated at 88.2±1.70 Ma to 169.5±3.7 Ma with the majority of ages ranging from 90 Ma to 140 Ma. The emplacement of the dikes suggests a major Yanshanian (Cretaceous) crustal extension in Shandong province. Together with other available age data, this study suggests four periods of crustal extension at about 80 Ma, 100 Ma, 120 Ma and 140 Ma, respectively. Besides the effect of collapse of the Yanshanian orogenic belt on the emplacement of the mafic dikes in Shandong in the Cretaceous, the mantle plume and the extensive left-lateral advection and extension of the Tanlu fault also have controlled the crustal extension and the emplacement of the mafic dikes in eastern Shandong and western Shandong, respectively.

关键词： crustal extension mafic dike K-Ar age mantle plume Tanlu fault Shandong eastern China

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Scheelite Sm-Nd dating and quartz Ar-Ar dating for Woxi Au-Sb-W deposit,western Hunan

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Chinese Science Bulletin 2003年第23期48卷 2640-2646页

作者： PENGJiantang HURuizhong zhaojunhong FUYazhou LINYuanxian InstituteofGeochemistry ChineseAcademyofSciencesGuiyang550002China TianjinInstituteofGeology&MineralResources ChineseMinistryofLandandResourcesTianjin300170China

Scheelite Sm-Nd and quartz Ar-Ar dating were accomplished for the Woxi Au-Sb-W deposit in western hu-nan. The results show that the Sm and Nd concentrations of scheelite are relatively high, and Sm/Nd ratios are usually high and variable. In the 147Sm/144Nd vs. 143Nd/144Nd diagram, the disseminated scheelites show a good linear array, which corresponds to an isochron age of 402 6 Ma and an initial 143Nd/144Nd ratio of 0.510544 9 (2s ) with a e Nd(t) value of -30.7. The Ar-Ar age spectra for 2 quartz samples display the saddle shape. The minimum apparent age, plateau age and isochron age of each quartz sample generally overlap within errors; and both the minimum apparent ages of 420 20 and 414 19 Ma coincide well with the scheelite Sm-Nd age. Both Sm-Nd and Ar-Ar dating results reveal that the Au-Sb-W mineralization at Woxi district took place in the Late Caledonian. This is in good agreement with the tectonic evolution of the Xuefengshan district and with some geo-chronological data available for Au, Sb and W deposits in this area. The low initial Nd isotope ratio of scheelites sug-gests that the fluid responsible for Au-Sb-W mineralization at the Woxi is of deep crustal origin and probably originated from the underlying Archaean continental basement rather than the host Proterozoic strata in western Hunan. The con-straints on the mineralization time and on the fluid source provide insight into the genesis of the Woxi deposit.

关键词：白钨矿钐钕石英氩金锑湖南

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