新疆塔里木盆地早白垩世孢粉组合  

EARLY CRETACEOUS PALYNOFLORAS FROM TARIM BASIN,XINJIANG

作　　者：江德昕[1] 何卓生[2] 董凯林[2] 

机构地区：[1]中国科学院兰州地质研究所 [2]地质矿产部西北石油地质局

出　　处：《Acta Botanica Sinica》1988年第4期430-440,共11页Acta Botanica Sinica（植物学报：英文版）

摘　　要：本文记述了新疆塔里木盆地下白垩统卡普沙良群孢子花粉55属108种包括6新种,建立了本区早白垩世孢粉组合序列,并根据孢粉组合讨论了地质时代和古气候特征。亚格列木组孢粉组合以裸子植物松柏类为主,缺乏被子植物花粉,其时代相当于贝利亚斯期至凡兰吟期;舒善河组孢粉组合仍以裸子植物为主,但出现原始被子植物花粉,时代应属豪特里维期至巴列姆期;巴西盖组孢粉组合的海金沙科孢子和被子植物花粉都有显著增加,时代应属阿普第期至阿尔必期。本区早白垩世古气候应属亚热带干燥或半干燥型,但在巴列姆期至阿尔必期相对潮湿。One hundred and eight species of fossil spores and pollen referred to 55 genera found from the Lower Cretaceous Kapushaliang (Kizilsu) Group in the Tarim Basin of Xinjiang have been studied in this paper.The Kapushaliang Group may be divided into the Yagelie- mu Formation,the Shushanhe Formation and Baxigai Formation in ascending order. The Yageliemu palynoflora is characterized by the predominance of gymnospermous pollen,the relative abundance of pteridophytic spores and the absence of angiospermous pol- len.Coniferae is dominant,while Lygodiaceae and Schizaeaceae are important in the flora. The most common species of palynomorphs are Todisporites minor,Cieatricosisporites doro- gensis,C.australiensis,Lygodiumsporites subsimplex,Schizaeoisporites cretacius,S.zizyphinus, S.certus Cibotiumspora paradoxa,Cyathidites australis,C.minor,Biretisporites potoniaet, Cycadopites minimus,Pseudowalchia biangulina,Parvisaccites radiatus,Podocarpidites multe- simus,P.canadensis,Alisporites bilateralis,Cedripites cretaceus,C.canadensis,Abietineaepol- lenites microalatus,Classopollis classoides,C.annulatus,C.xinjiangensis (sp.nov.),Ephe- dripites muhicostatus,E.mrimensis (sp.nov,),etc......The palynoflora is comparable with those of the lower part of the Lower Xinminbu Formation in northwestern China and the lo- wer part of the Lower Mannville Formation in western Canada,which is considered corre- sponding from Berriasian to Valanginian in age. The Shushanhe palynoflora is also characterized by dominance of gymnosperms and sub- dominance of pteridophyta.Some primitive angiospermous pollen grains are found in the upper part of the formation.In addition to the most common species of the above mentioned palynoflora,the important species in the present palynoflora comprise Cicatricosisporites po- tomacensis,C.orbiculatus,C.subrotundus,Concavissimisporites punctatus,C.verrucosus,C. globosus,lmpardecispora apiverrucata,Trilobosporites crassus,T.trioreticulosus,Pilosisporites verus,P.trichopapillosus,Klukisporites pseudoretivulatus,Ver

关 键 词：早白垩世 贝利亚斯期-阿尔必期 孢粉组合 古气候 塔里木盆地 

分 类 号：P532[天文地球—古生物学与地层学] Q913.84[天文地球—地质学]