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Geochemistry and Genesis of the Sodium-Charnockitic Gneisses, eastern hebei province, China

Acta Geologica Sinica(English Edition) 1992年第3期66卷 239-258页

作者： Wang Anjian Changchun University of Earth Sciences, Changchun, Jilin Changchun University of Earth Sciences Changchun Jilin

High in sodium and low in potassium (Na_2O/ K_2O>1), the charnockitic gneiss series in theSantunying- Taipingzhai area, eastern hebei province, consists of hypersthene- quartz- diorite,hypersthene-granodiorite and hypersthene-plagioclase-granite. Geological, petrological and large ion lithophileelement(LILE), high field strength element (HFSE) and REE geochemical studies suggest that themedium-coarse-grained hypersthene-granodiorite is the product of crystallization of anatectic magmas of thesame composition. Under granulite facies conditions, the equilibrium crystallization differentiation of themagmas yielded the early crystallization phase-high-SiO_2, LILE-depleted, low-∑REE, positive Eu anomalyand REE- saturated hypersthene- plagioclase- granite. The residual phase, coarse- grained to pegmatitichypersthene- granodiorite, is marked by low SiO_2, LILE-enrichment, high ∑REE and *** rocks and hypersthene-quartz-diorite enclaves constitute the sodium-charnockitic gneiss series in easternhebei province. Model calculation for trace elements in the granitoids was applied. On the basis of a systematicgeological study, the equation for calculation was chosen, the source magma was determined and the partitioncoefficients were obtained. The resulting curves are entirely consistent with those observed in the patterns of ac-tual rocks. The study indicates that whole-rock REE patterns can not be used directly in the comparison of thesources and genesis of granitoids.

关键词： sodium-charnockitic gneisses geochemistry genesis eastern hebei province

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Magmatic Event at the End of the Archean in eastern hebei province and Its Geological Implication

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Acta Geologica Sinica(English Edition) 2006年第6期80卷 819-833页

作者： GENG Yuansheng LIU Fulai YANG Chonghui Institute of Geology Chinese Academy of Geological Sciences Beijing 100037

By using the SHRIMP U-Pb and single zircon stepwise evaporation methods, the authors have obtained some results for granitoids from eastern hebei province. The Yuhuzhai hyperthene tonalitic granite was formed 2550 Ma ago, the Qingyangshu gabbroic gneiss 2536 Ma, the Yinmahe granodioritic gneiss near Lücao, Lulong County, 2533 Ma, the gabbro-dioritic gneiss near Longwan, Qianxi County, 2518-2515 Ma, the Qiuhuayu trondjemitic gneiss at Zunhua 2515 Ma, the Xiaoguanzhuang tonalitic gneiss at Zunhua 2495 Ma, and the Cuizhangzi gneiss in Qianxi County 2492 Ma. These geochronilogical data demonstrate that, though diverse in composition, type and origin, the granitic gneisses in eastern hebei province were emplaced and crystallized in a rather short period of magmatic activity. The formation of such a great amount of gneisses in this small time gap suggests that it was a critical crust accretion stage at the end of Neoarchean. The fact that granitoids of various types occurred at the same time implies a large-scale underplating （mantle plume） activity, which was then responsible for the crust accretion.

关键词： orthogneiss magmatic event Neoarchean zircon age eastern hebei province

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Occurrence and Integrated Control of Psylla chinensis in eastern hebei province

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Plant Diseases and Pests 2023年第1期14卷 14-16页

作者： Lijuan GAO Longfei LI Minghui JI Jintao XU Baofeng HAO Changli Institute of Pomology Hebei Academy of Agriculture and Forestry SciencesChangli 066600China

The paper introduces the damage characteristics and occurrence regularity of Psylla chinensis in pear orchards in eastern hebei province,and summarizes the integrated prevention and control techniques of ***,in order ... 详细信息

关键词： eastern hebei province Psylla chinensis Occurrence Control

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