贵州罗甸分水岭地区石炭─二叠系小浪风关组牙形石的发现及其地质意义  

Discovery of the Carboniferous-Permian Conodonts in Xiaolangfengguan Formation at Fenshuiling, Luodian County,Guizhou, and Its Significance

作　　者：王宁[1] 

机构地区：[1]贵州省地矿局区域地质调查研究院

出　　处：《贵州地质》1995年第4期283-289,共7页Guizhou Geology

摘　　要：本文首次报导了贵州省罗甸县分水岭地区石炭－二叠系小浪风关组中的牙形石，计有１０属，１３种。并将其分为７个带：Ｇｎａｔｈｏｄｕｓｂｉｌｉｎｅａｔｕｓｂｉｌｉｎｅａｔｕｓ—Ｇ．ｃｏｍｍｕｔａｔｕｓ，Ｄｅ－ｃｌｉｎｏｇｎａｔｈｏｄｕｓｎｏｄｕｌｉｆｅｒｕｓｎｏｄｕｌｉｆｅｒｕｓ，Ｇｏｎｄｏｌｅｌｌａｑｌａｎｎａｎｅｎｓｉｓ，Ｉｄｉｏｇｎａｔｈｏｄｕｓｄｅｌｉｃａｔｕｓ，Ｓｔｒｏｐ－ｔｏｇｎａｔｈｏｄｕｓｅｌｅｇａｎｔｕｌｕｓ，ＳｔｒｅｐｔｏｇｎａｔｈｏｄｕｓＷａｂａｕｎｅｎｓｉｓ－Ｓｔｒｅｐｔｏｇｎａｔｈｏｄｕｓｅｌｉｎｇａｔｕｓ，Ｓｗｅｅｔｏｇ－ｎａｔｈｕｓｗｈｉｔｅｉ．根据牙形石特征，确定小浪风关组为一跨下石炭统一早二叠统的岩石地层单位。据牙形石颜色，确定其变色指标为３．５～４级，经受过的古地温为１９１～２３６℃。It is first reported that the Carboniferous-Permian conodonts are well preserved in Xiaolangfengguan formaton at Fenshuiling. Luodian county of Guizhou. There are conodonts of 10 genera and 13 species identified as the following zones: Gnathodus bilineatus bilineatus-Gnathodus commutatus, Declinognathodus noduliferus noduliferus, Gondolella qiannanensis, Idiognathodus delicatus, Streptognathodus elegantules, Streptognathodus wasbanuensis-Streptognathodus elongatus, and Sweetognathous whitei. According to the conodonts features, the Xiaolangfengguan formation may be determined as a dischronous rock stratigraphic unit of the Carboniferous to Permian, which experienced a thermal event at the temperature of 191to 236° indicated by the conodonts coloralternation index (CAI)of 3. 5-4.

关 键 词：小浪风关组 牙形石 变色指标 分水岭地区 石炭纪 

分 类 号：Q915.645[天文地球—古生物学与地层学]