Sequence stratigraphy of Jurassic-Cretaceous boundary strata in Luanping, Northern Hebei, China

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• 作者：Shugang Tian (1)
  Yongqing Liu (1)
  Peixian Li (1)
  Qiqing Pang (2)
  Shaowu Niu (3)
  
• 关键词：sequence ; stratigraphy ; terrestrial stratotype ; Jurassic ; Cretaceous bound DOI ; 10.1360/03yd0451
• 刊名：Science China Earth Sciences
• 出版年：2004
• 出版时间：July 2004
• 年：2004
• 卷：47
• 期：7
• 页码：607-617
• 全文大小：599KB
• 参考文献：1. Liu Y., Tian S., Li P. et al., The stratigraphic framework of the Dabeigou-Dadianzi Formations in Luanping basin, northern Hebei and its stratotype significance, Acta Geoscientia Sinica (in Chinese), 2001, 22(5): 391鈥?96.
  2. Pang, Q., Li, P., Tian, S. et al., Discovery of ostracods in the Dabeigou and Dadianzi Formations at Zhangjiagou, Luanping County, northern Hebei Province of China and new progress in the biostragraphic boundary study, Geological Bulletin of China (in Chinese), 2002, 21(6): 329鈥?38.
  3. Niu, S., Li, P., Tian, S. et al., New progress in the study of conchostracon fossils from the Dabeigou Formation in the Luanping basin, northern Hebei Province of China, Geological Bulletin of China (in Chinese), 2002, 21(6): 322鈥?28.
  4. Niu, S., Li, P., Tian, S. et al., Discovery of conchostracan genus Clithrograpta and its significance in the Dadianzi Formation, Luanping basin, northern Hebei, Geological Bulletin of China (in Chinese), 2003, 22(2): 95鈥?04.
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• 作者单位：Shugang Tian (1)
  Yongqing Liu (1)
  Peixian Li (1)
  Qiqing Pang (2)
  Shaowu Niu (3)
  
  1. Institute of Geology, Chinese Academy of Geological Sciences, 100037, Beijing, China
  2. Shijiazhuang Economic College, 065000, Shijiazhuang, China
  3. Tianjin Institute of Geology and Mineral Resources, 300170, Tianjin, China
  
• ISSN：1869-1897

文摘

A sediment-continuous section of Jurassic-Cretaceous (J-K) boundary strata was found in Zhangjiagou of Luanping, northern Hebei Province, China. The boundary strata were systematically divided into 5 sequences, 13 subsequences and 139 parasequences by sedimentary cyclicities and facies analysis. According to stable time-ranges of subsequences and parasequences, some boundary ages can be marked as 142.90 Ma of the SQ I (Dabeigou Fm) basal bound, 141.16 Ma of the SQ II basal bound, 140.00 Ma of the SQ III (Dadianzi Fm) basal bound, 138.24 Ma of the SQ VI (Zhangjiagou Fm) basal bound and 135.34 Ma of the SQ V (Zhangjiagou Fm) top-bound. A sequence-stratigraphic framework of the Dabeigou-Zhangjiagou Fms has been constructed by tracing sequence-bounds, marker-beds and fossil zones. The basin-development and tectonic activities are studied based on sequence-stratigraphic evidence. 5 sequences represent 5 tectonic cycles and all the 6 sequence-bounds reflect tectonic activities. Tectonic activities clearly influence the basin-development that can be divided into 3 stages in the J-K transitional period. Each stage consists of a down-faulting-rising process, i.e. from strongly rising of basin-bottom, then violently faulting down (with volcanic eruptions) and to gently rising. The development shows a pattern of bottom down-faulting with basin narrowing and rising with spreading.