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华北克拉通北缘燕辽裂陷槽发育华北大陆克拉通化之后典型的盖层沉积——角度不整合于新太古代片麻岩之上的中—新元古界,通常认为是1800Ma到800Ma的沉积地层。近年来燕辽裂陷槽中—新元古代年代学研究取得了一系列突破,有必要对燕辽裂陷槽中—新元古代年代地层序列进行厘定。主要进展如下:1)获得了河北怀来赵家山、北京西山青白口和平泉双洞刘家沟下马岭组斑脱岩的锆石U-Pb同位素年龄:1380±36Ma、1379±12Ma和1372±18Ma,并测定了侵入下马岭组的基性岩床的锆石和斜锆石U-Pb年龄1320±6Ma,精确厘定了下马
The Neoproterozoic Neoproterozoic over the Neoproterozoic gneiss, typical of caprock-developed after the cratonization of the North China Craton, is generally thought to be 1800 Ma to 800 Ma Sedimentary formations. In recent years, a series of breakthroughs have been made in the mid-Neoproterozoic chronology of the Yanliao rift trough, and it is necessary to determine the sequence of Meso-Neoproterozoic stratigraphic sequences in the Yanliao rift trough. The main progresses are as follows: 1) U-Pb zircon ages of 1330 ± 36Ma, 1379 ± 12Ma and 1372 ± 1 were obtained from Zhaolaishan, Huaihua, Hebei Province, Qingbaikou, Xishan, Beijing, and Xiamaling Formation, 18Ma. The zircon and palaeokite U-Pb age of 1320 ± 6Ma, which intruded into the Xiamaling Formation, was determined precisely