贵州关岭地区法郎组瓦窑段菊石类新材料  

New ammonites in the Wayao Member of the Falang Formation in Guanling area,Guizhou Province

作　　者：马知恒 李世鑫 陈镜文 何犇 张廷山[1] MA Zhiheng;LI Shixin;CHEN Jingwen;HE Ben;ZHANG Tingshan(School of Geoscience and Technology,Southwest Petroleum University,Chengdu610500;Zjin School of Geology and Mining,Fuzhou University,Fuzhou350108;Guizhou Geological Survey,Guiyang550005)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]福州大学紫金地质与矿业学院,福州350108 [3]贵州省地质调查院,贵阳550005

出　　处：《地质论评》2024年第2期769-776,共8页Geological Review

基　　金：国家自然基金资助项目(编号:41972120,42172129);古生物化石的多维数字化及其生态-埋藏学科普研究(编号:黔科合支撑[2022]一般257)的成果

摘　　要：本文对采自于贵州关岭地区上三叠统卡尼阶法郎组瓦窑段上部的齿菊石目化石进行了研究,共识别出3属3种,其中包含一新种Arctosirenites mingqingensissp.nov.。Arctosirenites mingqingensis sp.nov.以具有细密横肋及粗壮腹缘瘤为特征,属Klipsteinia在华南为首次发现。根据Klipsteinia和Arctosirenites组合特征判断贵州关岭地区上三叠统法郎组瓦窑段底部时代为晚三叠世早卡尼期早期(Julian 1),上部时代归属于晚卡尼期早期(Tuvalian 1),并且认为造成法郎组瓦窑段底部的岩性变化是由于构造因素导致,而并非受到卡尼期湿润幕事件(CPE,Carnian Pluvial Episode)的影响。By analyzing the new ammonites from the Wayao Member of the Upper Triassic Falang Formation,this study aims to ascertain the age of deposition and elucidate the underlying factors responsible for lithological changes in the Falang Formation.Methods:A total of five ammonite fossil specimens were collected in this study,all of which were stored in the Geological Museum of Guizhou Province(No.GMG20220705001~GMG20220705005).GMG20220705001 is preserved stereoscopically,while the rest are preserved squashed.GMG20220705002~GMG20220705005 contain 40 ammonites,and nine individuals can be identified.Specimens were repaired using a pneumatic pen and sand blasting machine.Measurements of the specimens were taken using vernier calipers with an accuracy of 0.1 mm.Fossil images were captured using a SONY ILCE-7M3 SLR camera with an FE 24-105 mm f/4 GOSS lens.The post-processing of the images was conducted using CorelDRAW 2018 and Adobe Photoshop CS software tools.The measured shell parameters included shell diameter(D),umbilical diameter(U),and height of the last ring(H).For squish-preserved specimens,the width of the ring was not measured.Results:The specimens GMG20220705001~GMG20220705003 are attributed to the Arctosirenites mingqingensis sp.nov.The A.mingqingensis sp.nov.is characterized by the fine and dense ribs.Some other pointed specimens are attributed to the Klipsteinia cf.radiata and Trachyceras multituberculatum.Conclusion:①Three genera and three species of ammnoid were described,including a new species Arctosirenites mingqingensis sp.nov.,as well as the Klipsteinia cf.radiata and Trachyceras multituberculatum;②based on ammonite biostratigraphy,the lower boundary of the Wayao Member of the Falang Formation in Guanling area of Guizhou is assigned to be Julian 1(early stage of the Early Carneian),while the upper layers is approximately Tuvalian 1(early stage of Late Carneian);③based on regional structure analysis,lithology examination and biostratigraphic data,the lithological variations between the Zhuganpo Memb

关 键 词：Arctosirenites mingqingensis sp.nov. 菊石类 卡尼期湿润幕事件 晚三叠世 贵州关岭 

分 类 号：P534.51[天文地球—古生物学与地层学] Q915.2[天文地球—地质学]