地质科学2018，Vol.53Issue(2)：765-773,9.DOI:10.12017/dzkx.2018.043
新疆阿克苏寒武系吾松格尔组造迹行为的单调性
Monotony of the trace-making behavior from the Cambrian Wusonger Formation in Aksu, southern Xinjiang
摘要
Abstract
It is a common sense that most of benthic metazoan fauna,except some cyanomicrobes,unlikely survive in dolomitic flats.The Cambrian (Stage 2) Wusonger Formation is dolostonedominated with less limestone beds at the Xiaoerbulak section,Aksu of northern Tarim block in Xinjiang,NW China.Dolostones were largely formed in a wide shallow and strong evaporate tidal belt where was unfavorable for inhabitation of metazoan fauna including both benthic and nektonic communities.A low diverse ichnofauna is reported here for the first time,of which the taxa are all yielded from thin-bedded micritic limestones and identified as Chondrites,Helminthopsis,Skolithos,Stelloglyphu,Taenidium,Thalassinoides with descending order in abundance.Their morphological features are small burrows with simple structures and commonly occurred from shallow marine settings in Paleozoic time.Sparse trilobites and hyolithes shelly concentrations are also specially yielded from thin-bedded limestones.Therefore,palaeosalinity condition played an essential role in constraining of metazoan fauna.Both trace-makers without mineralization bodies and shelly fauna could migrated herein instantly once resurgences of normal salinity and turbulence environments coinciding to the deposition of thin-bedded limestones.The present case illustrates an evolutionary pattern that dolomitic flat hasn't been idealized setting for metazoan fauna thriving since their Early Cambrian Explosion of the Phanerozoic.关键词
遗迹/吾松格尔组/寒武系/塔里木板块/中国西北Key words
Ichnofossils/Wusonger Formation/Cambrian/Tarim block/NW China分类
天文与地球科学引用本文复制引用
于深洋,刘丽静,杨芝林,丁奕,李越..新疆阿克苏寒武系吾松格尔组造迹行为的单调性[J].地质科学,2018,53(2):765-773,9.基金项目
国家自然科学基金项目(编号:4137022,41221001)、现代古生物学和地层学国家重点实验室项目(编号:B052)和中国科学院B类先导专项培育项目(编号:XDPB05)资助. （编号:4137022,41221001）
