甘肃窑街中侏罗世Coniopteris margaretae的原位孢子与分散孢子的关系  

Relationship Between Spore in Situ and Dispersed Spore of Coniopteris margaretae of the Middle Jurassic from Yaojie,Gansu Province

作　　者：辛存林[1] 陈世伟[1] 都卫东[1] 魏明[1] 

机构地区：[1]西北师范大学地理与环境学院,兰州730070

出　　处：《地质科技情报》2011年第5期36-40,共5页Geological Science and Technology Information

基　　金：甘肃省自然科学基金项目(096RJZA119);西北师范大学地理学重点学科和生态经济基金项目

摘　　要：通过大量的室内实验分析,揭示了甘肃窑街盆地中侏罗世Coniopteris margaretae的原位孢子特征,可以概括为:孢子为四面体形,极面观为圆三角形;赤道面观为半圆形;体积较大,极面观直径为50～70μm,平均约64μm;三射线平直,其长度为半径的2/3～3/4;外壁光滑无纹饰;无周壁;孢子的颜色以黄褐色为主。明确了Cyathidites australis是Coniopteris margaretae的孢子,后者为前者的母体植物,从而为进一步研究Coniopteris margaretae的地理分布、生态特征提供了新的线索。我国侏罗纪的孢粉资料表明,阿连—巴柔期孢粉植物群中,在比较繁盛的蕨类植物和裸子植物中,仍以亚热带、热带气候带的分子为主,而干旱气候带的掌鳞杉科植物极其稀少。因此,可推断窑街盆地中侏罗世阿连—巴柔期的古气候为温暖潮湿的亚热带型气候。This paper studies in situ spore of Coniopteris margaretae from middle Jurassic Yaojie Basin,Gansu Province by laboratory experiments.The study summarizes the basic characteristics of the spores which are shaped tetrahedron,showing a polar view of a round triangle and the equator plane view from the semicircle and are big in volume,with the diameter of polar view varying from 50 to 70μm at an average about 64μm and whose length is 2/3 to 3/4 of the radius.The pores are mainly yellowish brown,with flat 3-rays,and smooth exine without ornamentation,and no perispore.The analysis indicates that the spores of Coniopteris margaretae is Cyathidites austrlis,with the latter as maternal plants of the former.The confirmation of this relationship provides a new clue for further research of the Coniopteris margaretae geographical distribution and ecological characteristics.The Jurassic sporopollen data from China show that prosperous pteridophyte and gymnosperm are dominated in subtropical and tropical,but Hirmerella plants in drought climatic zone in Aalenina-Bajocian palynoflora are scarce.Therefore,it can be deduced that the paleoclimate in Yaojie Basin was warm and humid subtropical climate in Aalenina-Bajocian,Middle Jurassic.

关 键 词：Coniopteris margaretae 原位孢子 中侏罗世 窑街组 甘肃 

分 类 号：Q914.81[天文地球—古生物学与地层学]