海拉尔盆地海参1井伊敏组孢粉组合的地层意义  

POLLEN AND SPORE ASSEMBLAGES OF THE YIMIN FORMATION OF HAICAN-1 WELL,HAILAER BASIN AND THEIR STRATIGRAPHIC SIGNIFICANCE

作　　者：李春柏[1] 万传彪[2] 乔秀云[2] 单玄龙[3] 王丽岩[3] 邵红君[2] 迟焕远[2] 刘彤彦[2] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]吉林大学地球科学学院,吉林长春130026

出　　处：《地层学杂志》2007年第1期23-34,共12页Journal of Stratigraphy

基　　金：国家自然科学基金(No49894190);大庆油田有限责任公司科技攻关基金(批准号:QR/AO/4-2-01)资助项目

摘　　要：海参1井伊敏组孢粉化石异常丰富,自下而上可以划分出3个孢粉组合:Impardecispora-Cyathidites-Clavatipollenites组合,Stereisporites-Deltoidospora-Asteropollis组合,Appendicisporites-Asteropollis-Tricolpites组合,分别分布于伊敏组一段、二段和三段,组合特征明显,是海拉尔盆地乌尔逊凹陷划分伊敏组与大磨拐河组的重要生物依据之一,更是伊敏组内三段划分和井间对比的生物依据之一。3个孢粉组合中见有属种繁多的海金沙科孢子及其他繁盛于早白垩世中晚期的孢子花粉,结合在绝大多数样品中发现的早期被子植物花粉的情况分析,推测含这3个孢粉组合的伊敏组地质时代为早白垩世巴列姆期—早阿尔必期(Barremian—Early Albian)。Abundant pollen and spores are found in the Yimin Formation of the Hailaer Basin for the first time. They can be divided into three assemblages from bottom to top. The first is the Impardecispora-Cyathidites-Clavatipollenites assemblage, which occurs in lowest part of the Yimin Formation. This assemblage is characterized by abundant fern spores （ranging from 60. 9% to 85. 36%）, followed by gymnosperm pollen（ranging from 13.82% to 38. 4%） and angiosperm pollen（ranging from 0.7% to 0.8%）. Fern spores are dominated by Cicatricosisporites australiensis （11.9-27.2%）, Cyathidites minor （0.81- 11.2 % ）, Cicatricosisporites minutaetriatus （0-9. 80%）, Impardecispora purveruleta （0.7-13.82 % ） and Pilosisporites verus （0-13.82%）, other important fern spores include Impardecispora trioreticulosa （0-0.7%）, Leptolepidites verrucatus （0 1. 4%）, Appendicisporites auriflerus （0-0.7%）, Cicatricosisporites minor（0-1. 4%）, Fixisporites tortus（0-0. 7%）, Foraminisporites wonthaggiensis（0- 1. 62%）, Aequitriradites ornatus（0-1.4）, A. reticulates（0-1. 4%）, A. spinulosus（0- 0.7%）, A. verrucosus（0- 0.81%）, Couperisporites complexus（ 0-0. 7%）, Triporoletes reticulatus（ 0-4. 87 % ）. Gymnosperm pollens are dominated by the genus of Piceaepollenites, including P. altus （0-6.3 %）, P. prologatus （0-0. 7 %）, and P. sp. （0-7. 31%）. Other common gymnosperm pollens include Pseudopicea variabiliformis（0- 13.2%）, Cycadopites nitidus （1. 4-3. 25 %）, Jiaohepollis c f. verus （1.4-0.81% ）, and J. verus （0- 1.4%）. Clavatipollenites hughesii（0. 7-0.81% ） is the only angiosperm pollen, which is numerically rare but has important biostratigraphic significance. The second assemblage is the Stereisporites-Deltoidospora-Asteropollis assemblage, which occurs in middle part of the Yimin Formation. Again, fern spores are the most abundant（44.4-77.8%）, followed by gymnosperm pollens（21. 0-55. 0%） and angiosperm pollens （0. 6-1.5%）. Among reco

关 键 词：海拉尔盆地 内蒙古 孢粉组合 早白垩世 伊敏组 被子植物花粉 

分 类 号：P534.53[天文地球—古生物学与地层学]