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 ...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.展开更多
In 1995, the Hebei Provincial Institute of Cultural Relics carried out the first excavation at the Jiangjialiang site. The work covered l, 600 sq m and resulted in the discovery of nine house-foundations and 78 tombs....In 1995, the Hebei Provincial Institute of Cultural Relics carried out the first excavation at the Jiangjialiang site. The work covered l, 600 sq m and resulted in the discovery of nine house-foundations and 78 tombs. The house-foundations are square semi-subterraneans arranged in four rows numbered from north to south. The tombs are divided into two types: rectangular earth shafts and earth caves. The funeral objects are mainly grouped in pen basin and dou stemmed vessel combinations.Most of the dead lie singly in an extended supine position. The house-foundations are largely intruded by tombs. ^14C-dating of the foundation F1 shows a date of 6850 ± 80 BP (uncalibrated). The tombs go back to the late Yangshao culture, closing to the Xueshan I period.展开更多
基金The paper is supported by the National Natural Science Foundation of China （Grant Nos. 40420120135 and 40072060）.
文摘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.
文摘In 1995, the Hebei Provincial Institute of Cultural Relics carried out the first excavation at the Jiangjialiang site. The work covered l, 600 sq m and resulted in the discovery of nine house-foundations and 78 tombs. The house-foundations are square semi-subterraneans arranged in four rows numbered from north to south. The tombs are divided into two types: rectangular earth shafts and earth caves. The funeral objects are mainly grouped in pen basin and dou stemmed vessel combinations.Most of the dead lie singly in an extended supine position. The house-foundations are largely intruded by tombs. ^14C-dating of the foundation F1 shows a date of 6850 ± 80 BP (uncalibrated). The tombs go back to the late Yangshao culture, closing to the Xueshan I period.
