摘要
笔者等在海南岛兰洋地区发现了丰富的石炭系孢子,计38属64种.其中,产于青天峡组上部的孢子组合,与G.Clayton等人所建立的“PU”带相当,属韦宪期早期。产于石岭组下部的孢子组合,则具有韦宪期中晚期的色彩。这些孢子的发现,为该区石炭系的划分与对比提供了重要依据,同时也有助于探讨海南岛大地构造的某些问题。作者依据孢子组合及其伴生的植物化石,对石炭纪广东大陆与海南岛分属两个地体的看法提出了质疑,而且还提出了“海南岛华力西褶皱带”形成于纳缪尔期之后的新认识.
Abundant spores (38 genera and 64 species) have been discovered in theLanyang area, Hainan Island. Among those spores, the spore assemblage occurringin the upper Qingtianxia Formation is characterized by the presence of Lycosporapusilla, and is equivatent to the 'PU' zone established by G. Clayton etc. It canessentially correlate with contemporaneous spore zones in Western Europe, NorthAmerica, the former U. S. S. R. and Guizhou, Gansu and Tibet of Ghina. The ageis early Visean. The spores occurring in the Lower Shiling Formation, besidessome spores that continue from the Qingtianxia Formation, also include some newelements, e. g.: Tholisporites of scoticus,Convolutispora floridia, C. venusta, Disce-rnisporites micromammillatus, Densosporites anulatus,Triquites sp., Verrucosisporitesverucosus etc. Most of these elements are common ones of the NM zone and VF zone established in the Upper Visean in Jingyuan, Gansu, by Gao Lianda. Theyrepresent Middle--Upper Visean. The discovery of these spores is of importantgeological significance. 1) The ages of various Carboniferous Formations aredefined through an analyse of the spore assemblage, i. e.: the Nanhao Formationis not later than Tournaisian, the Qingtianxia: Formation is Tournaisian--earlyVisean, the Shiling Formation is middle--late Visean--Namurran. 2) they havecreated conditions for the stratigraphic correlation of the Carboniferous inside andoutside an island; 3) according to the plant aspects reflected by the spore asse-mblage, combined with the plant fossils discovered in the area, the authors querythe validity of the arguments of the view that in the Carboniferous the Guang-dong continent and Hainan Island belonged to two composite terranes;4) a newidea has been raised that the Variscan fold belt of Hainan Island was formedafter the Namurian.
出处
《地质论评》
CAS
CSCD
北大核心
1993年第6期548-556,T001,3,共11页
Geological Review
关键词
孢子
石炭化
海南岛
spore
Carboniferous, Lanyang area
Hainan Island
