摘要
An international cooperative study of the Late Cretaceous biota and non-marine strata including the Cretaceous-Paleogene(K--Pg) boundary in Jiayin near the Heilongjiang River,China during 2002-2010,is summarized in this paper. The strata includes the Upper Cretaceous Yong'ancun-,Taipinglinchang-,Yuliang-zi-,and Furao formations,and the Paleocence Wuyun Formation consisting of Baoshantou Member and a Coalbearing Member. Seven palynological assemblages from Santonian to Paleocene are recognized,which is used for definition of the K--Pg boundary. Through the palynological analysis of three drilled boreholes (XHY-2005,2006,2008) in Xiaoheyan of western Jiayin,the K--Pg boundary is defined within 20. 00-20. 05 m in the borehole XHY-2006 (as a standard boundary) which is just between the top of Furao Formation (late Maasterichtian) and the base of Baishantou Member (early Danian) . These new research results are supported by paleo- magnetic,geochemical and other analyses,also. On the other hand,the presence of eight taxa of Maasterichtian dinosaurs (mostly hadrosaurids) have been recognized by the authors; and two mega-plant assemblages from the Yong'ancun Fm (Santonian) to Taipinglinchang Fm (Campanian) are confirmed. These research a-chievements indicate that the Upper Cretaceous-Paleocene in Jiayin can be well correlated to the strata in the neighboring Zeya-Bureja basin,Russia. The K--Pg boundary definited in Jiayin is the first well documented non-marine K--Pg boundary in China. Also the related paleoclimate,paleoenvironment and the mass extinctions in this area during the Cretaceous-Paleocene transition are also discussed.
An international cooperative study of the Late Cretaceous biota and non-marine strata including the Cretaceous-Paleogene （K-Pg） boundary in Jiayin near the Heilongjiang River, China during 2002-2010, is summarized in this paper. The strata includes the Upper Cretaceous Yong＇ancun-, Taipinglinchang-, Yuliang- zi-, and Furao formations, and the Paleocence Wuyun Formation consisting of Baoshantou Member and a Coal- bearing Member. Seven palynological assemblages from Santonian to Paleocene are recognized, which is used for definition of the K-Pg boundary. Through the palynological analysis of three drilled boreholes （XHY-2005, 2006, 2008） in Xiaoheyan of western Jiayin, the K-Pg boundary is defined within 20. 00-20. 05 m in the bore- hole XHY-2006 （ as a standard boundary） which is just between the top of Furao Formation （ late Maasterich- tian） and the base of Baishantou Member （early Danian）. These new research results are supported by paleo- magnetic, geochemical and other analyses, also. On the other hand, the presence of eight taxa of Maasterichtian dinosaurs （mostly hadrosaurids） have been recognized by the authors; and two mega-plant assemblages from the Yong＇ancun Fm （Santonian） to Taipinglinchang Fm （Campanian） are confirmed. These research achievements indicate that the Upper Cretaceous- Paleocene in Jiayin can be well correlated to the strata in the neighboring Zeya-Bureja basin, Russia. The K-Pg boundary definited in Jiayin is the first well documented non-marine K-Pg boundary in China. Also the related paleoclimate, paleoenvironment and the mass extinctions in this area during the Cretaceous-Paleocene transition are also discussed.
基金
the Projects NSFC 30220130698 40842002
Project"111"of China
the Project of the Bureau of Land&Resources of Heilongjiang,China for their financial supports to this research work
the financial supports of Russian Projects RFFI No.04-04-49522
the President Grantfor State Support of Leading Scientific Scholars in Russian Federation SS-1615 of Russia
