北京十三陵雾迷山组微体植物群落  

MICROALGAL COMMUNITIES OF WUMISHAN FORMATION,JIXIAN SYSTEM IN THE MING TOMBS DISTRICT,BEIJING

作　　者：周小平[1] 

机构地区：[1]南京大学地球科学系

出　　处：《江苏地质》1990年第3期27-32,共6页Jiangsu Geology

摘　　要：作者研究了北京十三陵雾迷山组微体植物化石,认为这些微体植物均具各自不同的生活习性以适应不同的微环境,构成不同的生物群落,包括藻席群落和非藻席群落。两种群落的份子保存为化石时有时相互混合,共同构成一个微化石组合。识别和区分同一组合不同群落份子对恢复其生活环境有着重要意义。Abundant and well-preserved microfossils have been detected from the black stromatolithic and non-stromatolithic cherts dating from 1200-1400 Ma in the Wumishan formation of Jixian system in Ming tombs,Beijing.The Wumishan microflora is mainly composed of spheroidal, ellipsoidal and filamentous microfossils which mostly three-dimensionally preserved in the cherts. During life,these algal microorganisms,according to their own habits,adapt to different micro environments and non-mat community.The mat community is dominated by filamentous cyanophyte or coccoidal cyanophyte which are mat-builders.It belongt to benthic communit in the marine intertidal and upper tidal zones.The nonmat cnmmunity consists of spheroidal, ellipsoidal and rare filamentous microorganisms.These planktonic or intermittent palnktonic microorganisms may boom in bionnasses in a suitable condition and from water blooms' wichh occur frequently in mordern algae.They inhabit in shallow water or water surface.Due to the change of environment,water blooms'may decline abruptly and sink to the ocean floor.As a result,ther were buried rapidly and preserved as microfossils gathered abundently along the band in cherts.

关 键 词：微体植物 群落 澡席 迷山组 十三陵 

分 类 号：Q914.82[天文地球—古生物学与地层学]