摘要
对首次发现于黑龙江虎林县东北部Ｈ８７３孔龙爪沟群的海相沟鞭藻类进行了初步研究，沟鞭藻组合包括１２属２０余种，其中描述和照相９属１７种，包含４新种：Ａｒｅｏｓｐｈａｅｒｉｄｉｕｍａｓｔｅｒｉｐｈｏｒｕｍｓｐ．ｎｏｖ．，Ｃａｎｎｉｎｇｉａｈｕｌｉｎｅｎｓｉｓｓｐ．ｎｏｖ．，Ｃｉｒｃｕｌｏｄｉｎｉｕｍｃｉｎｇｕｌａｔｕｍｓｐ．ｎｏｖ．和Ｌｅｐｔｏｄｉｎｉｕｍｈｕｌｉｎｅｎｓｅｓｐ．ｎｏｖ．。根据全球分布的一些重要种的地质历程，认为以Ｏｌｉｇｏｓｐｈａｅｒｉｄｉｕｍ属占优势和以丰富或较丰富的Ｏｄｏｎｔｏｃｈｉｔｉｎａｏｐｅｒｃｕｌａｔａ，Ｇａｒｄｏｄｉｎｉｕｍｔｒａｂｅｃｕｌｏｓｕｍ，Ｃｉｒｃｕｌｏｄｉｎｉｕｍａｔｔａｄａｌｉｃｕｍ，Ｐａｌａｅｏｐｅｒｉｄｉｎｉｕｍｃｒｅｔａｃｅｕｍ为代表的沟鞭藻组合的地质时代应为Ｈａｕｔｅｒｉｖｉａｎ－Ｂａｒｅｍｉａｎ期，很可能为Ｈａｕｔｅｒｉｖｉａｎ晚期－Ｂａｒｒｅｍｉａｎ期。在地层上可能相当于龙爪沟群的七虎林组上部。据此推论，龙爪沟群的地质时代很可能为早白垩世。
The Longzhaogou Group is distributed in the eastern Heilongjiang Province, NE Ch ina. It is subdivided into four formations in ascending order: the Peide, Qihuli n, Yunshan and Zhushan formations. Marine dinoflagellate cysts discovered from c ore samples of 703.57m deep H87 3 well drilled in the Northeastern Hulin county , eastern Heilongjiang Province, NE China are relatively diverse and well preser ved. The dinoflagellate bearing strata of the bore hole with a depth of 616.6- 703.0m consist of gray, grayish dark mudstone and may be assigned to the Qihuli n Formation of the Longzhaogou Group. A total of 20 dinoflagellate cyst taxa hav e been recorded, of which 17 species are described and illustrated in this paper , including 4 new species, Areosphaeridium asteriphoru m sp.nov., Canningia hulinensis sp.nov., Circulodinium cingulatum sp.n ov. and Leptodinium hulinense sp.nov. The dinoflagellate assemblage is chara cterized by:(1) the dominance of genera Oligosphaeridium, Circulodinium and Canningia belonging to the gonyaulacaceans, particularly Oligosphaeridium is very high in divesity and abundance; (2) the abundant Odontochitina operc ulata, Gardodinium trabeculosum and the more abundant Palaeoperidinium creta ceum. Based on characters of the dinoflagellate assemblage, correlation with t he Hauterivian-Barremian dinoflagellate cyst assemblage reported from Palar Bas in, southern India (Khowaja Ateequzzaman and Jain, 1992), and the global strati graphic ranges of some important species (Table Ⅱ), this assemblage is consider ed to be of Hauterivian-Barremian, probably Late Hauterivian-Barremian in age.
出处
《古生物学报》
CAS
CSCD
北大核心
1999年第2期183-202,共20页
Acta Palaeontologica Sinica
基金
中国科学院古生物与古人类学科基础研究特别支持费资助项目
关键词
沟鞭藻类
龙爪沟群
虎林盆地
黑龙江
dinoflagellates, Hauterivian-Barremian, Longz haogou Group, Hulin Basin
