贵州关岭生物群双壳类化石的古生态特征  

Paleoecological characteristics of fossil bivalves from the Guanling biota in Guizhou

作　　者：李旭兵[1] 孟繁松[1] 王传尚[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《中国地质》2005年第1期41-47,共7页Geology in China

基　　金：中国地质调查局地质大调查项目(200112900072)资助。

摘　　要：笔者描述了采集于贵州关岭生物群中4种双壳类化石,即顾氏海燕蛤HalobiakuiChen,平脊海燕蛤HalobiaplanicostaYinetHsü,斜锉蛤未定种Plagiostomasp.和麻生海扇未定种Asoellasp.。标本保存良好,时代为晚三叠世卡尼期早—中期。依据双壳类化石的古生态特征及沉积环境分析,指出在卡尼期早—中期,由于大量淡水的注入,关岭地区海水发生间歇性缺氧(或贫氧)事件,从而导致浮游或假浮游类型为主的双壳类化石的灭亡。This paper describes fossil bivalves found in the Guanling biota,including four species,i.e. Halobia kui Chen,Halobia planicosta Yin et Hsü,Plagiostoma sp. and Asoella sp. The specimens are well preserved. The age is Late Triassic early-middle Carnian. Based on a study of the paleoecological characteristics and environment,the authors conclude that the planktic and pseudoplanktic bivalves could be eliminated in the Guanling area due to the intermittent anoxic or dysoxic events caused by the input of large amount of fresh water during the early-middle Carnian.

关 键 词：双壳类 贵州关岭 古生态 化石 卡尼期 生物群 海燕 沉积环境 晚三叠世 海水 

分 类 号：Q911.5[天文地球—古生物学与地层学]