吉林省龙井市葆园屯田营组孢粉化石的发现及其意义  

DISCOVERY OF PALYNOMORPHS AND THEIR SIGNIFICANCE IN THE TUNTIANYING FORMATION OF BAOYUAN,LONGJING CITY,JILIN PROVINCE

作　　者：尚玉珂[1,2] 程金辉[3] SHANG Yu-ke;CHENG Jin-hui(Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;College of Palaeontology, Shenyang Normal University, Shenyang 110034, China;Key Laboratory of Economic Stratigraphic and Palaeogeograph y , Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment , Chinese Academy of Sciences, Nanjing 210008, China)

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]沈阳师范大学古生物学院,沈阳110034 [3]中国科学院南京地质古生物研究所和生物演化与环境卓越创新中心资源地层学与古地理学重点实验室,南京210008

出　　处：《古生物学报》2018年第1期105-118,共14页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(41102019;91114201);UNESCO-IUGS IGCP Project 632;中国科学院B类先导专项培育项目(XDPB05)联合资助

摘　　要：屯田营组为延吉盆地一套中性火山岩夹火山碎屑沉积岩,地质时代长期归于晚侏罗世或中侏罗世,前人对安图县明月镇该组孢粉分析,认为属早白垩世Berriasian期。本文经对龙井市葆园该组孢粉研究,认为以Cicatricosisporites-Pilosisporites-Aequitriradites为代表的孢粉组合时代为Berriasian期—Valanginian期。从而提出葆园屯田营组应为上部,安图县明月镇该组应为下部的意见。孢粉组合指示龙井县葆园地区这一时期有着繁盛的植被,包括真蕨纲、石松纲的蕨类植物,松柏纲、苏铁纲的裸子植物及少数苔藓类的藓纲植物,推测属温暖湿润的亚热带气候。The Tuntianying Formation,named in 1959,is a series of volcanic rocks intercalated with volcaniclastic rocks under neath the Changcai Formation in the Yanji Basin.It distributes mainly in Mingyue Town of Antu County, Laotougou, Tianbaoshan, Shilipu and Wangqing areas in Longjing City.Because of the insufficiency of study on volcanic movements and deficiency of biostratigraphic data,the definition,geological age and subdivision of the Tuntianying Formation remain debatable.The geological age of the Tuntianying Formation has been regarded as the Middle or Late Jurassic for a long period before Li（2001） assigned it to Berriasian of the Early Cretaceous based on palynomorphs in the Tuntianying Formation of Mingyue Town, Antu County. We studied palynomorphs in the Tuntianying Formation of Baoyuan,Longjing City to discuss the geological age and subdivision of the Tuntianying Formation further,and to provide more evidence for subdivision and correlation of Mesozoic volcanic strata inside and outside the Yanji Basin.The 2 samples were collected from Bed 4 in the section from Baoyuan railway station to the Laotougou coal mine which was first measured by Zhang Chuan-bo in 1980.There are 31 genera and 51 species in the palynomorph assemblage,including 16 genera and26 species of spores of Pteridophyta and 15 genera and 25 species of pollens of Gymnospermae.Pollens of Gynmospermae are more than spores of Pteridophyta in proportion,the former accounting for 58.64% and the latter 41.36%.The main components of pollens of Gymnospermae are dissacate pollens of conifers accounting for 32.81%of the total number,among which developed bisaccate pollens of Pinaceae and Podocarpaceae are more than undeveloped bisaccate pollens of Coniferales. There are a certain amount of monocolpate pollens of Ginkgoaceae or Cycadaceae（5%） and ring-grooved pollens of Cheirolepidiaceae（2.61%）.Among the pollens of Gymnospermae incertae sedis, monosaccate Callialasporitesaccounts for 2.59%.The rest palynomorphs account for less than 2% except

关 键 词：孢粉组合 屯田营组 Berriasian期—Valanginian期 早白垩世 葆园 龙井 吉林 

分 类 号：Q914.2[天文地球—古生物学与地层学]