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The change speed of the fluviatile and lacustrine wetlands is the highest, and the annual dynamic change rate is as high as 2.60%, such reduction is mainly caused by that many small plots are degraded into saline or alkaline lands and marsh wetlands.

河流湖泊湿地在研究时期内则表现出最快的变化速度,年均动态度达到2.60%,它的这种减少变化是由数量众多的小斑块退化为盐碱地和沼泽湿地导致。

The delta depositional system generally has three topography slope breakpoints, namely the breakpoint between topset and foreset, the breakpoint between delta foreslope and prodelta and the breakpoint between delta depositional system and normal lacustrine depositional system, of them the topography grade of the foreslope i...

三角洲沉积体系一般存在三个地形坡度转折点,即顶积层与前积层之间的转折点、三角洲前缘斜坡与前三角洲沉积之间的转折点、三角洲沉积体系与正常湖泊沉积作用之间的转折点,其中前缘斜坡的地形坡度最大。

The delta depositional system generally has three topography slope breakpoints, namely the breakpoint between topset and foreset, the breakpoint between delta foreslope and prodelta and the breakpoint between delta depositional system and normal lacustrine depositional system, of them the topography grade of the foreslope is the biggest.

三角洲沉积体系一般存在三个地形坡度转折点,即顶积层与前积层之间的转折点、三角洲前缘斜坡与前三角洲沉积之间的转折点、三角洲沉积体系与正常湖泊沉积作用之间的转折点,其中前缘斜坡的地形坡度最大。

Taking for example the salt rhythms of the Qianjiang Formation in the Qianjiang Sag of the Jianghan Basin (which is a typical Paleogene saline lacustrine basin in eastern China), through a detailed study on cores, the authors have determined for the first time the Ⅳ-order salt rhythm based on Ⅰ-,Ⅱ-and Ⅲ-order salt rhythms which were determined previously and got to know that the sedimentary process following the sequence of desalinizing→salinizing and crystallization of salt minerals from halite rock→(mud-bearing) glauberite rock→dolomite-bearing mudstone (mud-bearing doloston)→mudstone→doloston→glauberite rock→halite rock. The authors also analyzed the Ⅳ-order salt rhythm and the correspondence between its sedimentary records and the fluctuation of the palaeosalinity of waters and the short-scale (0.05~1.0 ka duration) change of dry-moist palaeoclimate.

本文以我国东部独具特色的古近纪古盐湖盆地-江汉盆地的潜江凹陷潜江组盐韵律为例,通过对王平1、王云10-6、王80-2等3口井连续取心段的精细研究,在前人划分Ⅰ、Ⅱ、Ⅲ级盐韵律的基础上,首次划分出组成含盐层系基础韵律单元-Ⅳ级盐韵律,弄清了它的沉积过程基本遵循从石盐岩→钙芒硝岩→含白云石泥岩→泥岩→白云岩→钙芒硝岩→石盐岩的淡化-咸化序列和盐类矿物的析出顺序;解析了Ⅳ级盐韵律及其沉积组合记录与水体古盐度波动和短尺度(0.05~1.0 ka)古气候干湿变化之间的对应关系。

The last interglacial strata sequence of Milanggouwan stratigraphic section in the Salawusu River valley has recorded 8^5 sedimentary cycles of aeolian sand alternatively interlaid with fluvio-lacustrine facies or paleosols.

萨拉乌苏河流域米浪沟湾剖面末次间冰期层系记录了8 5个风成的古砂丘砂与河湖相或/和古土壤构成的沉积旋回。

In the Jurassic and Cretaceous, generally it was also the shelf sea, but there were lacustrine and lagoonal environments in different parts of the basin.

侏罗纪-白垩纪在总的浅海陆棚环境下,盆地不同地区也形成了湖泊和潟湖环境。

Much importance has been attached to the application of laminae to deduce the changes of climates and environments in the past. Nevertheless, researches on the changes of laminae and the development of lacustrine physicochemical properties on the basis of periodic changes of climate remain to be conducted.

总之,纹层或页岩沉积的变化与气候的变化密切相关,利用纹层中的沉积信息研究气候和环境变化早已引起人们的重视,但以气候的周期性变化为主控因素来探讨纹层的变化和湖水的物理化学性质演化还有待开展。

Lacustrine dolomite reservoir in the hinterland of Biyang Sag is mainly distributed at No.2 and No.3 sections of Hetaoyuan with its development controlled mainly by the lithology diagenesis and noselike structure.

泌阳凹陷腹部湖相白云岩油层主要分布在核二3和核三2段,其发育程度主要受岩性、成岩作用和鼻状构造控制。

Depositional sequences in different depressions of the complex faulting lacustrine basin were mainly controlled by both the episodic tectonic movements with different orders and the periodical palaeoclimatic variations. Both of these parameters controlled fluctuation of lake level and also variations of the accommodation spaces.

复式断陷不同断陷内的层序,主要受旋回内不同级别幕式构造运动和气候周期性变化的控制,两者的共同作用影响著湖平面的升降和可容空间的变化。

Late Cenozoic Element Characters and Palaeoclimatic Change of the Lacustrine Sediments in Linxia Basin, China

临夏盆地晚新生代沉积物元素特征与古气候变迁,宋春晖;鲁新川;邢强;孟庆泉;夏伟民;刘平;张平-66文免费论文库,大学生论文库

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