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| 1 | Zircon U-Pb SHRIMP dating for the volcanic rocks of the Xiong’er Group: Constraints on the initial formation age of the cover of the North China Craton显示文摘The volcanic rocks of the Xiong'er Group occur widely in the southern part of the North China Craton, which mark the beginning of the cover in the southern part of the North China Craton. The age of the volcanic rocks is thus crucial to understand the tectonic regime and evolutionary history of the North China Craton in the Proterozoic age. Zircons from five volcanic rocks and intrusions were dated by U-Pb SHRIMP method. The results indicate that the Xiong'er Group formed in 1.80--1.75 Ga of Paleo-Proterozoic. Since the Xiong'er Group formed earlier than the Changcheng System, the earliest rocks in the Changcheng System is therefore assumed to be formed in 1.75 Ga. A thermal-tectonic event of ca. 1.84 Ga is indicated by new zircon U-Pb SHRIMP ages in the southern part of the North China Craton. The volcanic rocks of the Xiong'er Group thus represent the initial magmatism of the Paleo-Proterozoic breakup of the North China Craton. Numerous inherited zircons in the volcanic rocks mainly formed in ~2.20 Ga, indicating that the source magma of the volcanic rocks may be derived from the ~2.20 Ga crust, or from a mantle magma with significant contamination of the ~2.20 Ga crust. | ZHAOTaiping ZHAIMingguo XIABin LIHuimin ZHANGYixing WANYusheng | 2004 | Chinese Science Bulletin2004，49，23： | 84 |
| 2 | Mineralizing age of the Rushan lode gold deposit in the Jiaodong Peninsula:SHRIMP U-Pb dating on hydrothermal zircon显示文摘Zircons from the auriferous quartz vein in the Rushan gold deposit, Jiaodong Peninsula, have high common Pb contents (206Pbc = 2.00%—15.88%) and Th/U ratios (0.31—1.35), and trap primary CO2-H2O fluid inclusion similar to ore-forming fluids, indicating that they grew from high Th/U ratio ore-forming fluids responsible for gold min- eralization. SHRIMP U-Pb analyses of these zircons gave an age of 117±3 Ma comparable with the ages reported by the former researches in the other areas in the Jiaodong Penin- sula, which is interpreted as the age of gold mineralization at Rushan. The age of SHRIMP zircon U-Pb dating with 160±3 Ma from host rock Kunyushan monzogranite is different from that of the gold mineralization, indicating that there is no genetic relationship between gold mineralization and the granitic magmatism. SHRIMP U-Pb dating on hydrothermal zircons from auriferous quartz veins could be used to con- strain the timing of lode gold mineralization and the rela- tionship to relevant hydrothermal event. | HUFangfang FANHonarui YANGJinhui WANYusheng LIUDunyi ZHAIMingguo JINChengwei | 2004 | Chinese Science Bulletin2004，49，15： | 79 |
| 3 | Discovery of Late Paleozoic retrograded eclogites from the middle part of the northern margin of North China Craton显示文摘The retrograded eclogites have been discovered in the middle part of the northern margin of the North China Craton, which occur as lens or boudin within bio-tite-plagioclase gneisses in Paleoproterozoic Hongqiyingzi Group. The peak eclogite facies (P > 1.40—1.50 GPa, T = 680—730℃) mineral assemblage is composed of garnet, ompha-cite and rutile (±quartz), which was overprinted by the granulite facies mineral assemblage of vermicular symplec-tite of sodic clinopyroxene and plagioclase which replaced the precursory omphacite, and then amphibolite facies ret-rograded minerals with characterization of Amp+Pl ke-lyphitic rim and symplectite, and amphibole replaced clino-pyroxene. The protolith of retrograded eclogites is oceanic basalt formed at 438±11 Ma.The peak eclogite facies meta-morphic age of the retrograded eclogite is 325±4 Ma. These relict eclogites may be formed by the subduction of Pa-leo-Asian oceanic crust beneath the North China Craton during Late Paleozoic. The discovery of relict eclogite in this paper provides a new insight into farther understanding of tectonic evolution of the northern margin of the North China Craton, and the relationship between the Paleo-Asian Ocean and the North China Craton. | NIZhiyao ZHAIMingguo WANGRenmin TONGYing SHUGuiming HAIXiuling | 2004 | Chinese Science Bulletin2004，49，6： | 20 |
| 4 | Identification of Five Stages of Dike Swarms in the Shanxi-Hebei-Inner Mongolia Border Area and Its Tectonic Implications显示文摘Dike swarms are generally ascribed to intrusion of mantle-source magma result from extension. Basic dike swarms around the Shanxi-Hebei-Inner Mogolia borders in the northern peripheral area of the North China Craton can be divided into five age groups according to isotopic dating: 1800-1700 Ma, 800-700 Ma, 230 Ma, 140-120 Ma, and 50-40 Ma. Geological, petrological and isotope geochemical features of the five groups is investigated in order to explore the variation of the mantle material composition in the concerned area with time. And the various extensional activities reflected by the five groups of dike swarms are compared with some important tectonic events within the North China Craton as well as around the world during the same period. | SHAOJi'an ZHAIMingguo ZHANGLüqiao LIDaming | 2004 | Acta Geologica Sinica(English Edition)2004，78，1： | 9 |
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