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The study on the paleoclimate of Jixi Group in Jixi Basin, China


The study on the paleoclimate of Jixi Group in Jixi Basin, China



Pages 152-156 2000



The Early Cretaceous Jixi Group of Jixi Basin is an important coal-bearing stratum of east Heilongjiang Province, at the same time it is the main objective for petroleum exploration as well. Based on the sporopollen data, a thorough study has made of the paleoclimate during the deposition of Jixi Group, thus has provided a foundation to ore exploration. (1) The sporopollen character of each Formation of Jixi Group: Didao Formation is characterized by the predomination of gymnosperm plant pollen (61.5%), the next is pteridophyta spore (38.5%); Chengzihe Formation is characterized by the similar content of gymnosperm pollen (50.9%) and pteridophyta pollen (49.1%), few angiosperm pollen are found; in Muling Formation pteridophyta spore is predominant (70.9%), the next is gymnosperm pollen (28.1%), few angiosperm pollen are found (1.0%). (2) The discussion on the paleovegetation and paleoclimate of each Formation of Jixi Group: The vegetation type of Didao Formation: coniferous plants occupies 50.1%, evergreen broad-leaf plants 7.4%, deciduous broad-leaf plants 5.2%, shrubs occupy 11.5%, herbaceous occupies 24.6%, the vegetation may belong to coniferous park meadow; the climate zone type: tropical type 27.4%, tropical-subtropical type 22.1%, subtropical type 2.6%, tropical-temperate type 17.8%, temperate zone type 28.6%, the climate may belong to north subtropical; precipitation type: xerophytic plant 2.5%, subxerophytic plant 43.6%, moist habitat plant, marshy plant 1.7%, aquatic plant 1.5%, the environment may belong to moist feature. The vegetation type of Chengzihe Formation: coniferous plant occupies 23.3%, evergreen broad-leaf plant 12.0%, deciduous broad-leaf plant 2.0%, shrubs occupy 24.6%, herbaceous occupies 37.0%, the vegetation may belong to sparse woods shrub-meadow; the climate zone type: tropical plant type 36.9%, tropical-subtropical type 21.1%, subtropical type 2.6%, tropical-temperate plant type 31.9%, temperate plant type 6.6%, the climate may belong to middle subtropical; precipitation type: xerophytic plant 3.1%, subxerophytic plant 19.6%, moist habitat plant 57.2%, marshy plant 16.3%, aquatic plant 2.5%, the vegetation may belong to moist environment. The vegetation type of Muling Formation: coniferous plants occupies 28.8%, evergreen broad-leaf plants 9.8%, deciduous broad-leaf plants 0.2%, shrubs occupy 33.9%, herbaceous occupies 26.4%, the vegetation type may belong to sparse woods shrub-meadow; the climate zone type: tropical plants occupies 46.4%, tropical-subtropical plants 16.6%, subtropical plants 5.6%, tropical-temperate plants 27.8%, temperate plants 3.5%, the climate may belong to south subtropical; precipitation type: xerophytic plants occupies 2.6%, subxerophytic plants 24.3%, moist habitat plants 63.5%, marshy plants 9.4%, aquatic plants 0.8%, the environment must be moist. (3) Conclusion: during the Didao Formation deposition period, the vegetation is of coniferous park meadow, situated in the moist north subtropical; the vegetation of Chengzihe Formation and Muling Formation are of sparse woods shrub-meadow, the Chengzihe Formation is moist middle subtropical, Muling Formation is moist south subtropical. The deposition period of Jixi Group is constantly maintained by a moist condition, the climate turns warmer gradually, the border line between subtropical and temperate zone moves northwards actually. In this period the climate is moist and warm, vegetation is flourishing, it is an advantageous environment to form oil and gas. The deposition period of Didao Formation corresponds to the beginning of the rifting stage of the basin, the altitude of physical features differs in a great variety, the temperature is comparatively low. The basin begins to reduce during the deposition period of Muling Formation, the weather tends to be warmer, oxidizing process turns stronger. The deposition period of Chengzihe Formation is the forming period of the basin, the physical feature of the basin is open and smooth, the weather is appropriate, this is favourable for the plants to flourish and preserve organisms, it is the most advantageous period for forming and preserving oil, gas and coal, thus the Chengzihe Formation is the main exploring object strata of oil, gas and coal.

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