石炭纪有孔虫Globivalvulina moderata的生物地层意义  

THE BIOSTRATIGRAPHIC SIGNIFICANCE OF THE CARBONIFEROUS FORAMINIFERA GLOBIVALVULINA MODERATA

作　　者：盛青怡[1] SHENG Qing Yi(Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008)

机构地区：[1]中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《地层学杂志》2024年第1期100-108,共9页Journal of Stratigraphy

基　　金：国家自然科学基金(42293280、41702016);江苏省自然科学基金(BK20171102);现代古生物学和地层学国家重点实验室(20172109)共同资助。

摘　　要：石炭系巴什基尔阶底界的全球界线层型剖面和点位(俗称“金钉子”)于1996年被确立在美国内华达州的Arrow Canyon剖面,是以牙形刺Declinognathodus noduliferus的首现为标志。该金钉子确立后,发现存在一些问题,如D.noduliferus的演化谱系存在争议,作为浅水相对比标志的有孔虫需要进一步研究,特别是在层型剖面的D.noduliferus首现层位之上约2.5 m出现的有孔虫Globivalvulina moderata能否作为石炭系中间界线的辅助生物标志?另外,Arrow Canyon剖面还存在沉积间断。本文通过研究华南安徽凤凰山剖面和贵州店子上剖面的双列虫和球瓣虫化石材料,梳理了有孔虫Biseriella parva、Globivalvulina moderata和Globivalvulina bulloides的分类学定义,并尝试探讨了Globivalvulina moderata的生物地层学意义。结果表明在密西西比亚纪晚期,G.moderata在古特提斯地区和北美的极地地区就已经出现,之后在宾夕法尼亚亚纪早期该种出现在北美其他地区,因而Globivalvulina moderata的首现是穿时的,不宜作为石炭系中间界线的辅助生物标志。The Global Boundary Stratotype of Section and Point(GSSP)of the Serpukhovian/Bashikirian boundary was placed at the Arrow Canyon section,Nevada,USA in 1996.It was defined by the first appearance of the conodont Declinognathodus noduliferus.However,there are still some problems in this stratotype section,such as the appearance of sedimentary hiatuses in the section and the disagreements over the evolutionary lineage of D.noduliferus,which demand for further study of auxiliary foraminiferal markers in shallow water.Can the foraminifera Globivalvulina moderata that occurred about 2.5 m above the FAD(first appearance datum)of D.noduliferus in the Arrow Canyon section be used as an auxiliary biomarker for the Serpukhovian/Bashikirian boundary?By studying specimens of Biseriella and Globivalvulina from the Fenghuangshan and Dianzishang sections in South China,taxonomic definitions of the foraminifera Biseriella parva,Globivalvulina moderata,and Globivalvulina bulloides were revised.Stratigraphic correlation indicate that G.moderata appeared first in the Late Mississippian throughout the Paleo-tethys and Arctic North America,and then can be found in other areas of North America from early Pennsylvanian,suggesting that the first appearance of G moderata in the world was diachronous.

关 键 词：石炭系 有孔虫 谢尔普霍夫-巴什基尔阶界线 Globivalvulina moderata 

分 类 号：P534.45[天文地球—古生物学与地层学]