吉林珲春新近系土门子组孢粉组合及其意义

通过对吉林珲春土门子组孢粉样品分析。建立了Quercoidites-Ulmipollenites-Liquidambar-pollenites组合。根据孢粉植物群特征及其与周围地区对比，其地质时代归属新近纪中中新世为宜。孢粉组合中喜温成分占多数，亚热带成分如Caryapollenites、Liquidambarpollenites等也较为常见，反映了当时比较温暖湿润的暖温带-亚热带气候，在我国第三纪植物群区系中属于东部落叶阔叶林植物区。     

Abnormal overpressure distribution and natural gas accumulation in foreland basins,Western China

Shizitan in Jixian County, Shanxi Province, is a site of transitional period from Paleolithic to Neolithic. The dating and the sporopollen analysis show that the middle reaches of the Yellow River where the site is located had been maintaining a steppe environment during 35.1-9.4 kaBP, in which, 35.1-17 kaBP belonged to the last glacial. With cold and dry climate, this period featured a desert steppe environment. In the late of this period, the area had a cold and half-humid steppe environment. The 17.0-11.9 kaBP belonged to the early- and mid-period of the last deglaciation. Mild and half-arid steppe alternates with mild and half-arid steppe, with a small amount of deciduous broadleaf species. During the period of 11.9-10.5 kaBP, cold and dry glacial climate appeared once more, featuring a desert steppe environment. During 10.5-9.4 kaBP, it is mild and half-arid, and later transited toward warm and half-humid. The early phase of this period featured a steppe environment and the later transited into a steppe environment with fairly more deciduous broadleaf species. Microlith, a mark of a transitional period from Paleolithic to Neolithic, was distributed mainly in 17.0-11.9 kaBP. The relatively warm, half-arid and fluctuating steppe environment in the early and medium period of the last deglaciation made a contribution to the appearance and development of Microlithic culture.     

三塘湖盆地中、上三叠统划分及分布

目的明确三塘湖盆地中、上三叠统小泉沟群在盆地内部各凹陷的分布及地层划分和时代归属等问题。方法依据新获得的较为丰富的动、植物及孢粉化石资料,综合归纳前人研究成果进行充分讨论及对比。结果中、晚三叠世,马朗—方方梁—苇北地区呈隆起状态,遭受风化剥蚀,故马朗凹陷缺失中、上三叠统,盆地西北部的汉水泉凹陷、条湖凹陷和东南部的淖毛湖凹陷为湖泊,接受了中、上三叠统沉积。结论三塘湖盆地由于受晚海西构造运动的影响,致使盆地整体抬升并褶皱,未接受上二叠统和下三叠统沉积。     

A 1.5 Ma sporopollen record of paleoecologic environment evolution in the central Chinese Loess Plateau

A 1.5 Ma sporopollen record was obtained from a continuous loess-paleosol sequence at Chaona in the central Chinese Loess Plateau. It shows that (1) arid herbs of largely Artemisia and Chenopodiaceae and arbors of mainly Pinus, Betula and Quercus dominate loess and paleosol, respectively, reflecting cycles of cold-dry and warm-humid conditions of glaciation and interglaciation; (2) that similar vegetation pattern and cold-dry condition were found in times of unusual thick and coarse loesses L9 and L15, which have been regarded as two extremely cold and dry times as indicated by inorganic climatic proxies; and (3) that shifts of vegetations from earlier forest-steppe to open-forest and steppe and then to steppe were found at 0.95 and 0.5 Ma,implying a stepwise of drying of the Loess Plateau in the Quaternary.     

上海马桥遗址先人生活的古地理环境

上海马桥遗址经多次发掘，取得了很多成果．本次采集了2005年发掘的05MMT4探方样品，进行孢粉、藻类研究．根据孢粉、藻类成分特征，划分出了3个孢粉组合带．它们分别是：1带是以常绿栎-禾本科-香蒲属-松属-水龙骨科-环纹藻为主孢粉带；2带是以环纹藻-常绿栎-槐叶萍-水龙骨科-香蒲属-禾本科为主孢粉带；3带是以松属-柳属-常绿栎-藜科-蕨属-水龙骨科-环纹藻为主孢粉带．恢复了当时古植被和古地理环境．并对马桥先人的生活环境、农耕发展作了探讨，为上海地区文化发展及文明化进程提供了十分宝贵的新资料．     

Palynomorphs in the first paleosol layer in the Yangtze Delta and their paleoenvironmental implication

The relatively abundant palynomorphs were recovered from the samples of the first paleosol layer of core CY in Shanghai for the first time. A total of 55 genera and families of spore, pollen and phytoplankton were identified. According to the characteristics of the palynological assemblages, the depositional conditions in the development period of the paleosols were discussed and the microfossil evidence to study the origin of the paleosols in the Yangtze Delta area was provided as well. The research results show that paleosols should be freshwater deposits. The palynological assemblage sequence in the first paleosol layer reveals fluctuations of freshwater palynomorphs, mainly Concentricystis, and terricolous herbs pollen, reflecting the alternations of deposition and exposure in the development period of the paleosols. Concentricystis developed prosperously in the period of flood, while terricolous herbs grew on the emerged land in the period of exposure. The variations in the palynological assemblages suggest that the depositional conditions were various during the formation of the paleosols, and resulted in obvious stage characteristics of the paleosol's development. The dinoflagellate cysts occur in low abundance in the palynological assemblages of the first paleosol layer of core CY, indicating that the area where core CY lies was influenced by seawater in the depositional period of the parent materials of the paleosols.     

山东滕县煤田石炭一二叠纪生物群及其地层划分

本文通过对膝县煤田晚古生代含煤岩系中发现的各类古生物化石的研究,提出了石炭-二叠系及各统的生物划分依据。并在古生物群特征和岩性特征详细研究的基础上,对膝县煤田晚古生代地层作了进一步的厘定。     

Environmental indicators from comparison of sporopollen in early Pleistocene lacustrine sediments from different climatic zones

Two lacustrine sporopollen records obtained from the Qaidam Basin (in the non-monsoonal region) and the Linxia Basin (in the monsoonal transition zone) indicate that during the early Pleistocene open forest-steppe/steppe vegetation developed in the Qaidam Basin, while in the Linxia Basin an open cypress forest-steppe shifted to a conifer/conifer-steppe and then to open forest-steppe vegetation. Existing sporopollen records from the Chinese Loess Plateau (CLP) (in the monsoonal region) indicate that around the Sanmen Paleolake open forest-steppe shifted to pine/conifer-broadleaved mixed forest. The conifer cover then changed to a subtropical evergreen broadleaved forest distributed around the Nihewan Paleolake. These changes suggest that wetter conditions progressed from western China to the east, and the climate became more humid than that of today indicating a stronger Asian summer monsoon during the early Pleistocene.     

台北凹陷晚三叠世孢粉组合及其地层意义

目的 研究吐鲁番一哈密盆地台北凹陷黄山街组和郝家沟组的地层特征和孢粉组合.方法 利用该区4口钻井52块岩心样品进行孢粉化石分析、鉴定、统计和比较.结果 鉴定出孢粉化石5l属56种;建立了黄山街组Aratrisporites-Apiculatisporites-Piceites组合和郝家沟组Osmundacidites-Aratrisporites-Cycadopites组合.结论 台北凹陷黄山街组和郝家沟组的地质时代为晚三叠世.     

Discrimination of depositional seasonality of tidal flat sediment in northern Jiangsu Province, China

12 consecutive monthly sediment samples were collected from the tidal flat surface in Dafeng County, Jiangsu province. Palynological analysis of these samples indicates that seasonal palynological features of the tidal flat sediment are distinct and some palynological indices such asspecies percentages of Arboreal and Herbaceous pollen and spore are good indicators for discriminating the depositional seasonality of the tidal flat sediment. Sedimentary sequences formed between 1984 and 1994 were used to verify this method. The result proposes that this method can be applied to muddy flat and the species percentage of arboreal pollen is the best indicator for the seasonality study of the tidal flat sediment.