四川龙门山地区早中泥盆世孢子化石研究  

Lower and Middle Devonian Spore Assemblages from Longmen Mountains,Sichuan Province

作　　者：黄敏[1] 朱怀诚[2] 刘锋[2] 彭辉平 

机构地区：[1]中国地质科学院,北京100037 [2]中国科学院南京地质古生物研究所,现代古生物学和地层学国家重点实验室,南京210008

出　　处：《地质论评》2016年第6期1533-1548,共16页Geological Review

基　　金：中国地质科学院基本科研业务费资助项目(编号:YWF201608);中国科学院南京地质与古生物研究所资助项目(编号:421060105)的成果~~

摘　　要：本文系统研究了四川龙门山地区下泥盆统桂溪组、木耳厂组、观音庙组、关山坡组以及中泥盆统金宝石组的孢子化石,共鉴定孢子41属81种,建立了三个孢子组合带,由下至上分别是:Retusotriletes rotundus—Calamospora panucea(RP)孢子组合、Synorisporites downtoensis—Verrucosisporites scurrus(DS)孢子组合、Densosporites inaequus—Grandispora inculta(Ⅱ)孢子组合。通过与研究较为详细的西欧、北美地区的经典资料,包括老红砂岩大陆、北欧、加拿大等地区,以及国内相关资料的对比,结合特征种的地层分布、重要属种的含量、孢子大小等组合特征,确定RP组合时代为Lochkovian,DS组合时代为Pragian至早Emsian,Ⅱ组合时代为Eifelian中晚期—Givetian早期。这也是首次在金宝石组中发现孢子化石并对其进行研究。另外,通过对孢子直径的统计分析从另一个角度探讨了古植物的演化历程。Objectives：The Devonian strata of Longmen Mountains in Sichuan Province are so well-developed that it is the ideal place for Devonian stratigraphy and biostratigraphy research.The present paper is dealing with miospores from Guixi,Muerchang,Guanyinmiao,Guanshanpo Formations of Lower Devonian and Jinbaoshi Formation of Middle Devonian in Longmen Mountains. Methods：From these formations 29 samples were collected and processed with standard palynological analysis, abundant but not well-preserved miospores were macerated more or less in 27 samples,while 2 samples were barren. Results：There are 81 species assigned into 41 genera having been recognized.Three assemblages have been proposed in ascending order,namely,Retusotriletes rotundus—Calamspora panucea（RP）assemblage from Guixi Formation and the lower part of Muerchang Formation,Synorisporites downtoensis—Verrucosisporites scurrus （DS ） assemblage from the upper part of Muerchang,Guanyinmiao and Guanshanpo Formations,Densosporites inaequus—Grandispora inculta（II）assemblage from Jinbaoshi Formation. Conclusions：After comparing with the relevant palynological zones of China,Europe,America and other areas,the RP assemblage is considered to belong to Lochkovian,the DS assemblage is from Pragian to early Emsian,and the II assemblage is from late—middle Eifelian to early Givetian.And,according to statistics of the size of spores,some comments on the evolution events of plants are also included in the paper.

关 键 词：下泥盆统 中泥盆统 孢子组合 龙门山 四川 

分 类 号：Q911.2[天文地球—古生物学与地层学]