俄罗斯阿穆尔河东部上泽亚坳陷始新统孢粉

报道一个产于上泽亚(UupperZeya)坳陷(东经129-130°,北纬54-55°)东南部,保存良好的化石孢粉植物群.孢粉组合中裸子植物花粉居统治地位,占总数的53.4%,其中Taxodiaceae占36.3%,松科仅占5%.被子植物花粉占39.9%,多为葇荑花序类,如胡桃科、桦木科、山毛榉科等;同时还有不少反映温暖气候的分子,如Liquidambar,Balsaminaceae,Magnoliaceae,Nyssaceae等.孢子植物占21%.这样的孢粉植物群代表了潮湿温暖的温带气候.孢粉学至今在坳陷区内仍是人们用以确定地层时代的唯一依据.Pistillipollenitesmacgregorii,Anacolosiditessuplingensis,Ulmoideipites tricostatus及U. crempii等的出现可以确定含孢粉地层的地质时代属于中-晚始新世.斯涅日诺戈斯克产煤区中晚始新世沉积中的孢粉层位与普里阿姆尔耶,雅库提亚和亚洲东北部的同期沉积相当.

POLLEN AND SPORES FROM THE EOCENE STRATA OF THE UPPER ZEYA DEPRESSION, EAST TO RIVER AMUR, RUSSIA

A well-preserved fossil pollen flora was reported from the southeastern part of the Upper-Zeya depression(long. 129-130° E, lat. 54-55° N). In the palynoflora gymnosperm pollen consists up to 53.4% of the total tally, of whichTaxodiaceae makes up to 36.3% of the total. There are a few of Pinaceae pollen (5%). Angiosperm pollen occupies 39.9%, andis characterized by the great diversity (38 taxa). Most of the Angiosperm are amentaceous families: Juglandaceae (5%),Myricaceae, Fagaceae (4.5%). Representatives of thermoboreal broad-leaved families of Fagaceae, Hamamelidaceae, Rutaceae,Tiliaceae, Araliaceae, Moraceae and subtropical families Balsaminaceae, Magnoliaceae, Nyssaceae are constantly found insmall amounts. Spores comprise 21% of the total pollen tally. In the depression area spores and pollen grains are still the onlybiostratigraphic tool in the age determination for the deposits. Such a palynoflora probably suggests a humid and warmclimate. Existence of Eocene taxa: Pistillipollenites macgregorii Rouse (＞ 5%), Anacolosidites suplingensis Rouse, andTricolpites plectosus And., is important in the determination of Middle to Late Eocene age for the palynoflora which iscorrelative with those in Priamurye, Yakutia and northeastern Asia.