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| 嫩江阶底界层型剖面研究 | |
| 引用本文： | 李罡,陈丕基,万晓樵,姜剑虹,刘吉才,尹德顺,阎伟.嫩江阶底界层型剖面研究[J].地层学杂志,2004,28(4):297-299,335. |
| 作者姓名： | 李罡 陈丕基 万晓樵 姜剑虹 刘吉才 尹德顺 阎伟 |
| 作者单位： | 1. 中国科学院南京地质古生物研究所,江苏,南京,210008 2. 中国科学院南京地质古生物研究所,江苏,南京,210008;现代古生物学和地层学国家重点实验室江苏,南京,210008 3. 中国地质大学,北京,100083 4. 黑龙江省煤田地质局,黑龙江,哈尔滨,150001 5. 黑龙江省煤田地质物测队,黑龙江,哈尔滨,150001 6. 黑龙江省煤田地质研究院,黑龙江,哈尔滨,150001 |
| 基金项目： | 全国地层委员会研究项目 |
| 摘 要： | 通过对黑龙江省嘉荫县东南永安村东的黑龙江南岸永安村组和太平林场组界线剖面的研究 ,发现两组界线之下是永安村组顶部的灰色厚层状粉砂质泥岩 ,界线之上整合覆盖着太平林场组的黑灰色页岩 ,页岩以产俞氏链叶肢介 H alysestheria yui(Chang)为特征。全国地层委员会 2 0 0 2年指定嫩江阶的层型剖面为黑龙江省肇州县光荣乡郑德福屯的 2 5号钻孔剖面 ,以青岗链叶肢介 H alysestheria qinggangensis Zhang & Chen的首现作为嫩江阶底界的生物标志。古生物学研究表明 ,青岗链叶肢介 H.qinggangensis是俞氏链叶肢介 H.yui的同物异名 ,俞氏链叶肢介 H.yui的首现便是嫩江阶底界的生物标志 ,因此建议将该阶的界线层型剖面由钻井岩心剖面改为嘉荫县永安村东的永安村组和太平林场组界线的地表露头剖面。该层型剖面沿黑龙江边呈陡坎出露 ,界线清楚 ,交通方便 ,化石丰富 ,易于参观和研究对比。 |
| 关 键 词： | 嫩江阶 白垩系 永安村组 太平林场组 嘉荫县 黑龙江省 |
| 文章编号： | 0253-4959(2004)04-0297-03 |
STRATOTYPE OF THE BASAL BOUNDARY OF THE NENJIANGIAN STAGE, CRETACEOUS |
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| LI Gang ,CHEN Pei-ji ,WAN Xiao-qiao ,JIANG Jian-hong ,LIU Ji-cai ,YIN De-shun and YAN Wei.STRATOTYPE OF THE BASAL BOUNDARY OF THE NENJIANGIAN STAGE, CRETACEOUS[J].Journal of Stratigraphy,2004,28(4):297-299,335. | |
| Authors: | LI Gang CHEN Pei-ji WAN Xiao-qiao JIANG Jian-hong LIU Ji-cai YIN De-shun and YAN Wei |
| Institution: | LI Gang 1),CHEN Pei-ji 1)2),WAN Xiao-qiao 3),JIANG Jian-hong 4),LIU Ji-cai 5),YIN De-shun 6) and YAN Wei 6) |
| Abstract: | In China the Cretaceous strata are mainly of continental deposits. It is very difficult to correlate these strata with the international standard stages that were established based on marine fossils. At first, it is necessary to propose a Chinese Standard Stratigraphical Scale for the local use. Then it will be correlated with the International Standard Scale. And now there are 12 Cretaceous stages constructed on the Chinese non-marine strata. The Nenjiangian is the third one, from bottom to top, of the six Upper Cretaceous stages. It is defined based on the Borehole 25 drilled at the Zhengdefu Village (125°15′E, 45°42′N) of Zhaozhou County, Heilongjiang Province. Its basal boundary was defined by the first occurrence of conchostracan Halysestheria qinggangensis Zhang & Chen. But the stratotype is a subsurface drilling core, it is not convinient for visiting and studying. Now a new geological surface section is recognized along the southern bank of the Amur River in the Yong′an Village of Jiayin County, northern Heilongjiang Province. It shows continuous non-marine deposits from the Yaojian Stage (Yongancun Formation) to the lowermost Nenjiangian Stage (Taipinglinchang Formation). The uppermost Yongancun Formation, consisting of grey, greenish grey fine-grained sandstone and grey thick-bedded silt mudstone, is concordantly overlain by the Halysestheria yui (Chang) bearing blackish grey shale of the lowermost Taipinglinchang Formation. Because H. yui is a member of the lowermost H. qinggangensis conchostracan zone of the Nenjiangian, and the latter is the synonym of the former, here the authors propose to use the boundary between the Yongancun and Taipinglinchang Formations along the Amur River near Jiayin County as the new stratotype of the basal boundary of the Nenjiangian Stage. |
| Keywords: | Nenjiangian Cretaceous Jiayin County Heilongjiang Province China |
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