摘要
传统观念认为GSPD组合始于中二叠世孔谷期,据新疆等地资料证实此类组合的出现要早得多。准噶尔盆地在Profosulinella-Pseudostaffella带之下和相当层位的晚石炭世早期地层中存在两个孢粉组合,即(1)早巴什基尔期巴塔玛依内山组的Remysporitesvaricus-Striatolebachiitesjunggarensis组合(Pro-GSPD)和(2)中晚巴什基尔期-早莫斯科期车排子组的Protohaploxypinusverrucosus-Hamiapolleniteschepaiziensis组合(GSPD)。结合以往在乌拉尔东、西坡,加拿大北极群岛和育空地区的记载,论述了这些大体同时代GSPD组合在植物地理、古生态和生物地层对比上突破传统观念的重大意义,指出亚安加拉区起源很早,随着欧亚大陆的北移和半干旱气候带的扩张,某些亚安加拉植物成分可能发生过向南的迁移。
In palaeobotanic textbooks (e. g. Gothan and Weyland. 1974), the Mesophytic (a period dominated by gymnosperms, particularly conifers) is considered to begin from earlyLate Permian (roughly corresponding to the base of Zechstein in Europe). In classic palynological monographs (e. g. Hart, 1965: Traverse, 1988), on the other hand, assemblages ofgymnospermous, especially striate pollen dominance (called GSPD assemblage for short inthis paper) are generally thought to start from early Middle Permian (Kungurian). Thesetwo traditional concepts, both related to and different from each other, are widely acceptedamong palynological circles and often used as clues to age--determination of unknown strata. However, more and more palynological data indicated that GSPD assemblages occurredmuch earlier than they were traditionally thought. The present study aims at demonstrating with some examples the appearance of GSPD assemblages, under specific ecologicalconditions, as early as the early Late Carboniferous, i. e., Bashkirian--Moscovian. Description of the relevant taxa will be published in the monograph A Systematic Study on Carboniferous--Permian Spores and Pollen from N. Xinjiang.
出处
《古生物学报》
CSCD
北大核心
1994年第1期24-47,共24页
Acta Palaeontologica Sinica
关键词
孢粉
晚石炭世
孢粉组合
花粉
Palynological GSPD assemblage
Bashkirian-Moscovian
N. Xinjinag.