【摘要】 依据东基三井1 226. 0～1 538. 0 m井段的孢粉鉴定结果,结合前人资料,首次将该井段孢粉组合命名为Cyathidites-Taxodiaceaepolleni-Aquilapollenites组合。其组合特征为:裸子植物花粉占48. 10%～78. 58%,蕨类孢子占2. 44%～34. 18%,被子植物花粉占0%～28. 26%;蕨类孢子中Cyathidites百分含量最高(0. 79%～37. 50%),其次是Cicatricosisporites (0%～12. 50%)和Leiotriletes (0%～10. 00%),重要分子有Appendicisporites、Schizaeoisporites、Lygodiumsporites和Lygodioisporites;裸子植物花粉中Inaperturopllenites的百分含量最高(11. 29%～38. 83%),其次是Taxodiaceaepollenites (12. 66%～28. 57%),重要分子有Tsugaepollenites、Parcisporites、Parvisaccites、Ephedripites和Classopollis等;被子植物花粉中Tricolpites的百分含量最高(0%～16. 46%),其次是Betulaepollenites (0%～15. 22%),含量较高的还有Momipites和Tricolporopollenites,重要分子有Aquilapollenites、Fibulapollis和Proteacidites等。该组合可以与松辽盆地嫩江组孢粉组合对比,地质时代为晚白垩世Santonian-Campanian期。鉴于宁安市南团子山、高家等露头区海浪组所产Estherites mitsuishii、E. liuxinensis、Tylestheria cf. shanhoensis、Halysestheria yui、Calestherites sp.和Brachygrapta? sp.等叶肢介化石群,系松辽盆地嫩江组常见分子,故将东基三井1 226. 0～1 538. 0 m井段划归为海浪组,废弃"七星河组"一名。更多还原

【Abstract】 Based on the palynological data from 1 226. 0 ～ 1 538. 0 m of Dongji 3 borehole,the Cyathidites-Taxodiaceaepolleni-Aquilapollenites assemblage is established for the Upper Cretaceous in Sanjiang Basin,eastern Heilongjiang. The assemblage is characterized by abundant gymnosperm pollen( 48. 10% ～ 78. 58%),fern spores( 2. 44% ～ 34. 18%) and angiosperm pollen( 0% ～ 28. 26%). Fern spores mainly consist of Cyathidites( 0. 79%～ 37. 50%),Cicatricosisporites( 0% ～ 12. 50%) and Leiotriletes( 0% ～ 10. 00%). Important spores are Appendicisporites,Schizaeoisporites,Lygodiumsporites and Lygodioisporites. Among the gymnosperm pollen,Inaperturopllenites( 11. 29% ～ 38. 83%) and Taxodiaceaepollenites( 12. 66% ～ 28. 57%) are dominant,followed by Tsugaepollenites,Parcisporites,Parvisaccites,Ephedripites and Classopollis. The angiosperm pollen is characterized by high content of Tricolpites( 0% ～ 16. 46%) and Betulaepollenites( 0% ～ 15. 22%),followed by Momipites and Tricolporopollenites,with Aquilapollenites,Fibulapollis and Proteacidites as important components. The assemblage can be closely correlated to the palynological assemblage from Nenjiang Formation in Songliao Basin,with an age of Santonian-Campanian. In view of the conchostracan fauna represented by Estherites mitsuishii,E. liuxinensis,Tylestheria cf. shanhoensis,Halysestheria yui,Calestherites sp. and Brachygrapta? sp. was found in the Hailang Formation in the outcrops at Nantuanshanzi and Gaojia villages in Ning’an City,eastern Heilongjiang,and the fauna is also common in the Nenjiang Formation in Songliao Basin,the strata at depth 1 226. 0 ～ 1 538. 0 m in Dongji 3 borehole should be assigned to Hailang Formation. Therefore,the former Qixinghe Formation should be abandoned.更多还原