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1.
The changes of taxonomical composition of the Late Jurassic-Early Cretaceous palynofloras are revealed,in the upper stream of Bureya River in Bureya Basin.The palynofloras are dominated as follows:the Berriasian one by ferns(Cyatheaceae,Dicksoniaceae,Osmundaceae),Classopollis and bisaccate pollen;the Valanginian-Hauterivian one by ferns(Cyatheaceae,Dicksoniaceae),Ginkgocycadophytus and bisaccate pollen;the Barremian one by ferns(Cyatheaceae,Dicksoniaceae);the Aptian one by ferns(Cyatheaceae,Dicksoniaceae,Gleicheniaceae) and Ginkgocycadophytus;and the Albian one by ferns(Schizaeaceae) and bisaccate pollen.In the Albian the floral diversity raises with the angiosperms appearing. 相似文献
2.
On the contiguous territories of Russia and Chi-na,along the left and right banks of the Amur Riv-er (Heilongjiang Province of China,and Amur Oblast' of Russia),among the Late Mesozoic ter-rigenous and volcano-plutonic formations,several Precambrian prot… 相似文献
3.
When the spatial parameters of regional ore-magmatic systems of Russian Amur Province is estimated,the deep seismic results and gravity data are most often used. In the first case,the correlation of ore-deposits with the thickness of the sialic crys-talline complexes and the crust bottom depth are considered (Kokorin, 1988; Sukhov etal., 2000; Moiseenko,1996),in second case the spatial laws of deposit distribution relative to the regional Bouge minimums explained by “granitization”and lowd… 相似文献
4.
P.Ya.Baklanov 《资源与生态学报(英文版)》2011,(3):283-285
A geographical position and objective processes of globalization become leading factors of the orientation of the Russian east areas in the long-term development to interaction with the countries of the Asian-Pacific region (APR) and also to various natural resources and transport potential of the Pacific Ocean. 相似文献
5.
A.KRYSHTOFOVICH 《地质学报》1924,3(2)
All the forms undoubtedly prove the Jurassic age of the coal-beering strata of Pataohol.A more exact age of the deposits is difficult owing to the small uumber of spscies represented Nevertheless the presence of Dioonites kotoi which is typical as it seems,to the npper divission of the east-asiatic Jurassic,and shows the probability that the series at Pataoho corresponds nearer to the Nicanian Series of the Maritime Province or to the Upper Division of Jurassic deosits developed in the Ussuri Region. 相似文献
6.
On the contiguous territories of southeastern Russia and northeastern China,many gold-bearing areas are conjugate in space with the gradient zones of the gravity field.Large gold-ore districts,defining in many respects the metallogenic signature of the region,are located on the joints of differently oriented gradient zones.In the best-studied districts,the Precambrian protrusions,staged distribution of magmatic chambers (by vertical) above the Mohorovicic discontinuity and restriction to the peripheral parts of intrusive massifs have been recognized.Different-type gold deposits in the studied ore-placer districts and nodes are often located on the areas of joint of the granitoid massifs and subvolcanic bodies with depressions.Availability of areals of metasomatic alterations of rocks,placers,and ore occurrences of precious metals on such but poorly studied areas can serve as the basis for the revision and detailed forecasting-prospecting works to develop the mineral-raw material base of the region for precious metals. 相似文献
7.
The aim of the investigation is to reveal possible causes of isolation and co-occurrence of the economically significant concentrations of gold and tin. Comparative analysis of the different-rank factors that influenced migration and concentration of these elements show that different geochemical properties of Au and Sn are responsible for isolation of their big concentrations giving rise to independent metallogenic provinces, zones, and ore nodes. These differences resulted in individualization of the elem... 相似文献
8.
Just twenty. seven years ago Ⅰ started my geological-investigations of North Manchuria in connection with the construction of the Chinese Eastern Railway, on behalf of the Board of Directors of the said Railway and the Russian Geographical Society. 相似文献
9.
Tafiana V. Selivanova 《东北亚地学研究》2006,9(2):176-179
Hankaisky Region is the most densely populated and economic developed part of the Primorskiy Krai.It is promoting development of dangerous geological processes there.In the article the reasons of formation and intensive development in Hankaisky Region of the following dangerous geological processes lateral,winder and ground erosive,sill,floods,taluses,bogging,slope wash,karts,rebound of ground are considered. 相似文献
10.
Anatoly Obzhirov 《东北亚地学研究》2006,9(2):161-163
The research works of methane concentration in water column of the Okhotsk Sea from 1984 to 2005 were reviewed.And some regularities of methane distribution in water column in the North-East Sakhalin slope of the Okhotsk Sea were concluded. 相似文献