共查询到20条相似文献，搜索用时 593 毫秒
1.
大连地区碳酸盐岩分布广泛 ,裂隙溶洞发育 ,洞穴堆积物中蕴含了丰富的更新世哺乳动物化石和古文化遗物 ,在境内陆地和附近海域陆续发现了 30余处化石点。在众多的化石点中尤以古龙山遗址和大连动物群最引人注目 ,前者在同一地点内采集到 377种上万件的脊椎动物骨骼化石 ,并伴有石器、骨器、灰烬等远古人类活动的遗物 ;后者包括了 2 8种早更新世的小型哺乳动物 ,这是大连乃至东北地区的首次报导。这些事实说明了东北地区不只是仅有晚更新世的动物群 ,至少还有早更新世的大连动物群 ,即使在晚更新世 ,也不只是单一的披毛犀 -猛犸象动物群 ,还存在着具有从华北向东北过渡性质的古龙山动物群。今后工作中应注意寻找古人类及中更新世的哺乳动物化石 ,加强对全新世动物遗骨的研究。 相似文献
2.
《地球科学与环境学报》1995,(2)
环纹藻化石不仅广泛分布于我国东南部新生界地层，而且笔者近年在黄土高原区晚更新世以来的孢粉中亦有较多发现。在８个化石点共找到环纹藻化石２３７８粒．研究表明，它具有横向和纵向分布规律性。含环纹藻的孢粉组合不仅有喜暧湿的阔叶树种花粉，而且也有喜冷湿的暗针叶树种花粉，反映了环纹藻对气候有很强的适应性．我国西部环纹藻化石种类较东南部单调，其数量从东向西趋于减少。其时代分布，从晚更新世早期到晚全新世，以中全新世最为繁盛。人们可依据它及其共生藻类，追溯到地史时期淡水湖沼的消长。 相似文献
3.
本文对郑州市董寨村发现的纳玛象化石的地质时代,提出了与考古界不同的看法。通过对纳玛象化石的地史分布和伴生动物组合特征的分析,以及化石产出岩石与附近相关地层的对比,确认董寨村出土的纳玛象的地质时代,并非“距今40～50万年”的中更新世,而是介于晚更新世早期丁村动物群与晚更新世中期萨拉乌苏动物群之间,距今约10万年。通过对化石动物生态习性的分析,认为当时郑州一带的气候条件同目前我国北亚热带北界,淮河～秦岭蒂相近似,但比现在稍干燥;该时期郑州一带的自然景观,西部丘陵山区为阔叶林和针阔混交林,东部平原区为稀树草原,郑州处在林缘地带。 相似文献
4.
自中更新世以来,渤海沿岸地区至少发生过3标大规模的海进与海退。这几次海进与海退恰与间冰期和冰期相对应。每当冰期来临,海平面下降,发生海退,使得渤海和北黄海大陆架全部或大部分暴露海面,渤海海峡消失,在辽东半岛和山东半岛之间出现老铁山角—蓬莱角陆桥,成为更新世古北介动物和东洋介动物群南北相互迁徙的必由之路。辽东半岛千山山脉西麓发现的更新世东洋介动物群分子和渤海中部、山东半岛发现的披毛犀—猛犸象动物群的典型分子等种属,就是老铁山角—蓬莱角陆桥存在的最好佐证。老铁山角—蓬莱角陆桥的确立,对省内第四纪地层划分与对比、冰期与间冰期的划分、古地理古气候的恢复,以及哺乳动物的迁徙和演化等的研讨是非常有意义的。 相似文献
5.
1978年在郑州南郊采获一枚安氏鸵鸟蛋(Struthisanderssoni)化石,它产出在晚更新世马兰黄土中,属原地埋藏。从而揭示了郑州地区晚更新世时期干旱多风沙的气候特点和辽阔平坦干草原的自然景观。 相似文献
6.
大连茶叶沟洞穴堆积物中含有脊椎动物化石6属、6种,时代为晚更新世。该脊椎动物群明显地反映了华北脊椎动物群和东北脊椎动物群的过渡性质,它对研究动物的迁徙、地层对比以及大连地区第四纪地层划分具有意义。人工打击过的骰骨和置问号的大连智人的发现更为重要。 相似文献
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20 0 0～ 2 0 0 1年度 ,广西自然博物馆申请的 5项基础科学科研项目 ,全部荣获国家自然科学基金资助。这 5个项目是 :《宁明盆地鱼化石与中新生代地质事件和气候变迁》 ,《百色盆地边缘洞穴堆积环境与旧石器文化研究》 ,《中国西南重要晚更新世人类化石的年代学研究》 ,《中国晚更新世大熊猫化石的分子石生物学研究》 ,《百色盆地与东亚早期人类环境适应性研究》。其中前 2项是以广西自然博物馆为主申请的科研项目 ,后 3项是广西自然博物馆作为合作单位申请的科研项目。国家自然科学基金是资助我国自然科学基础研究和应用的基金 ,其宗旨是把… 相似文献
10.
在陕西省澄城县采集到一对保存相当完好的南方象第三上臼齿化石。我国关于南方象化石的报导不多,在陕西省则是首次发现。这一发现对了解更新世时期南方象在我国的分布提供了新资料。 相似文献
11.
李悦 《中国海洋湖沼学报》1994,12(3):236-245
The removal processes of major seawater chemical constituents in the Bohai Sea include seawater ex-change between the Bohai Sea and the Northern Yellow Sea,cation exchange,interstitial water burialand spray,formation of illite,sepiolite,sulfate and sulfur,and carbonates.The mass balance calculationbased on these processes is very applicable to the Bohai Sea. 相似文献
12.
李悦 《中国海洋湖沼学报》1994,(1)
Because of the almast enclosed nature of the Bohai Sea, rivers are considered as the sources of the major seawater chemical constituents there. The annual quantities of river-derived solutes and solids in Bohai Sea water are accurately calculated in this paper. 相似文献
13.
自１８５５ 年黄河改道北行至今，山东省的渤海湾海岸线向海方面推移了１９ｋｍ ，黄河泥沙的造陆面积达２８２７ｋｍ２ ，而在江苏省北部从双洋口至小丁港１５０ｋｍ 的海岸线上共失去土地１３２０ｋｍ２ 以上。作者认为，可以疏通明清黄河故道作为引黄工程，利用黄河携带的大量泥沙淤积于黄海沿岸，以减缓黄海岸线的侵蚀，还可抑制黄河泥沙沉积而造成的渤海的淤积。 相似文献
14.
This study investigates the wind energy input, an important source of mechanical energy, in the coastal seas east of China. Using the wind field from the high-resolution sea surface meteorology dataset in the Bohai Sea, Yellow Sea, and East China Sea, we studied the wind energy input through surface ageostrophic currents and surface waves. Using a simple analytical formula for the Ekman Spiral with timedependent wind, the wind energy input through ageostrophic currents was estimated at ～22 GW averaged from 1960 to 2007, and through use of an empirical formula, the wind energy input through surface waves was estimated at ～169 GW. We also examined the seasonal variation and long-term tendency of mechanical energy from wind stress, and found that the wind energy input to the East China Sea decreased before the 1980s, and then subsequently increased, which is contrary to what has been found for the Bohai Sea and Yellow Sea. More complicated physical processes and varying diffusivity need to be taken into account in future studies. 相似文献
15.
Sedimentary basins in the Yellow Sea can be grouped tectonically into the North Yellow Sea Basin (NYSB), the northern basin of the South Yellow Sea (SYSNB) and the southern basin of the South Yellow Sea (SYSSB). The NYSB is connected to Anju Basin to the east. The SYSSB extends to Subei Basin to the west. The acoustic basement of basins in the North Yellow Sea and South Yellow Sea is disparate, having different stratigraphic evolution and oil accumulation features, even though they have been under the same stress regime since the Late Triassic. The acoustic basement of the NYSB features China-Korea Platform crystalline rocks, whereas those in the SYSNB and SYSSB are of the Paleozoic Yangtze Platform sedimentary layers or metamorphic rocks. Since the Late Mesozoic terrestrial strata in the eastern of the NYSB (West Korea Bay Basin) were discovered having industrial hydrocarbon accumulation, the oil potential in the Mesozoic strata in the west depression of the basin could be promising, although the petroleum exploration in the South Yellow Sea has made no break-through yet. New deep reflection data and several drilling wells have indicated the source rock of the Mesozoic in the basins of South Yellow Sea, and the Paleozoic platform marine facies in the SYSSB and Central Rise could be the other hosts of oil or natural gas. The Mesozoic hydrocarbon could be found in the Mesozoic of the foredeep basin in the SYSNB that bears potential hydrocarbon in thick Cretaceous strata, and so does the SYSSB where the same petroleum system exists to that of oil-bearing Subei Basin. 相似文献
16.
Desertization of the continental shelf of China in the later stage of Late Pleistocene 总被引：1，自引：0，他引：1
In the later stage of Late Pleistocene, global climate entered into the climax period of Würm when temperature decreased remarkably
and glaciers developed. Information from the East China Sea also confirm that the sea level fell by at least 130 m at that
time (Emery, 1968). The Bohai Sea and Yellow Sea at the climax period were totally exposed, while the East China Sea and South
China Sea shelf regions were exposed partly. The exposed shelf area exceeded 1 million km2 and became a salty desert where land plants could not survive. Such were the conditions which led to the desertization of
the shelf region.
Eolation was the major exogenetic force not only on land but also on the shelf region in the ice age. At the climax period
of Würm, the northern part of China developed thick layers of loess deposits. The shelf region at that time had similar climatic
conditions and sediments. Because the shelf region was not protected by vegetation in the ice age, intensive wind storms remoulded
the primarily deposited strata to produce new sedimentary differentiation and new series of land sediments. Shallow-layer
profiler records indicated the existence of many land sediment types, including dunes, dune-chains, desert bodies, thick layers
of repose angle sediments and desertization derivatives.
New data available show the shelf region adjoining China can be divided into six regions of desertization and its derivatives.
Contribution No. 1846, from the Institute of Oceanology, Acadernia Sinica.
Project sponsored by the National Natural Science Foundation of China. 相似文献
17.
利用黄河泥沙围出“渤海湖”的初步设想 总被引：1，自引：0，他引：1
郝戬 《地球信息科学学报》2001,3(3):76-79
本文是一个关于将渤海变成淡水湖的水利工程的构想。让黄河的大量泥沙通过人工导流的方式沿莱州湾南岸与渤海海峡沉积延伸,产生的陆地将渤海封闭并逐渐形成淡水湖。这一工程将陆地连接山东半岛与辽东半岛,并为华北提供巨大淡水库,具有显著的经济、生态效益。具体实施上,可通过两道渔网式围栏促使黄河泥沙定点沉积并阻挡浪潮侵蚀,通过加强汛期水量增加黄河口泥沙。 相似文献
18.
NUMERICAL SIMULATION AND DYNAMIC STUDY OF THE WINTERTIME CIRCULATION OF THE BOHAI SEA 总被引：10，自引：2，他引：8
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20.
In this paper, the authors used the Princeton Ocean Model (POM) to simulate the seasonal evolutions of circulation and thermal structure in the Yellow Sea. The simulated circulation showed that the Yellow Sea Warm Current (YSWC) was a compensation current of monsoon-driven current, and that in winter, the YSWC became stronger with depth, and could flow across the Bohai Strait in the north. Sensitivity and controlling tests led to the following conclusions, In winter, the direction of the Yellow Sea Coastal Current in the surface layer was controlled partly by tide instead of wind, In summer, a cyclonic horizontal gyre existed in the middle and eastern parts of the Yellow Sea below 10 m. The downwelling in upper layer and upwelling in lower layer were somehow similar to Hu et al. (1991) conceptual model. The calculated thermal structure showed an obvious northward extending YSWC tongue in winter, its position and coverage of the Yellow Sea Cold Water Mass in summer. 相似文献