渝东南地区泥盆纪牙形刺及其地层意义  

DEVONIAN CONODONTS IN SE AREA OF CHONGQING CITY AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：龚黎明[1] 王成源[2,3] 王长生[4] 胡云喜[1] 唐用洋[1] 胡平[1] 王庆东[1] 

机构地区：[1]重庆市地质矿产勘查开发局川东南地质大队,重庆400030 [2]沈阳师范大学古生物学院,沈阳110034 [3]中国科学院南京地质古生物研究所,南京200018 [4]重庆工商大学旅游与国土资源学院,重庆400067

出　　处：《微体古生物学报》2012年第3期282-298,共17页Acta Micropalaeontologica Sinica

基　　金：川东南地质大队及国家自然科学基金联合资助基金重点项目(40839910);国家自然科学基金面上项目(41072008)的资助

摘　　要：本文研究了渝东南地区3个泥盆纪剖面的牙形刺,黔江濯水剖面的顶部(第7层)产有Palmatolepis quadrantinodosalobata等牙形刺,时代为法门期早期Middle crepida带至Lower rhomboidea带,是本区泥盆纪海相沉积的最高层位;酉阳兴隆剖面(第51层)发现牙形刺Palmatolepis semichatovae等牙形刺,时代为弗拉斯期晚期Lower rhenana带;濯水剖面的5层和6层、黔江水泥厂剖面的5层至7层以及酉阳兴隆剖面的52层和53层均产有较多的弗拉斯期晚期的牙形刺。本区写经寺组、黄家磴组和云台观组都可能是穿时的,写经寺组在各剖面残留厚度不同。写经寺组的时代为弗拉斯期晚期至法门期早期。本区缺少法门期中、晚期的典型的海相沉积。描述了一个新种Polygnathus chongqingensis Wang sp.nov.。Conodonts from three sections in SE area of Chongqing City are studied. Palmatolepis quadrantinodosalobata and other conodonts have been found at the top (bed 7) of the Xiejingsi Formation at the Zhuoshui section in Qianjiang, and its age should be Early Famennian from Middle crepida Zone to Lower rhomboidea Zone, representing the highest horizon of Devonian marine deposits in this area. Palmatolepis semichatovae and other conodonts have been found in the Xinlong section (bed 51) in Youyang,which should be assigned to late Frasnian Lower rhenana Zone. Many Frasnian conodonts come from the Zhuoshui section(beds 5 and 6), and cement factory section(beds 5 and 7) in Qianjiang and Xinlong section (beds 52 and 53) in Youyang, and the conodont horizons in these three sections can be correlated with each other, which can be assigned to late Frasnian. Some Polygnathus species are found from the Huangjiadeng Formation of the Xinlong section, corresponding to Frasnian. The Xiejingsi, Huangjiadeng and Yuntaiguan formations probably are diachronous in this area, with different thickness in each section. Polygnathus chongqingensis as a new species is described.

关 键 词：牙形刺 写经寺组 法门期早期 弗拉斯期 穿时 渝东南地区 

分 类 号：Q915[天文地球—古生物学与地层学]