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991.
秦岭及黄土区现代栎林的孢粉组合研究 总被引:3,自引:0,他引:3
根据秦岭及黄土区六种栎林的表土孢粉分析,探讨了不同栎林孢粉组合的差异。资料表明,六种栎林在乔木、灌木、草本、藤本花粉和蕨类孢子组成和数量方面均有一定差异。据此,我们选出了37个科属的植物作为定量判别的依据,提出了定量判别不同栎林的标准。 相似文献
992.
文章研究了广西隆林祥播地区中二叠统茅口阶,上二叠统吴家坪阶,长兴阶的有孔虫动物群,计有22属55种,7个未定种,分属于5个超科中的12科。并由下而上建立5个有孔虫组合,介绍了各组合特征。 相似文献
993.
In the southern coastal area of Finland, many studies exist on shore displacements related to the higher Ancylus Lake and Litorina Sea altitudes. However, the late- Holocene shore displacement history is much less known and the shore displacement models are based on interpolations. Kruunuvuorenlampi, a small lake located at an altitude of 8.6 m a.s.l., was studied to test the reliability of the interpolated models. The cores revealed an unusual bottom lithostratigraphy, with a coarse gravel and sand layer sandwiched between the lower marine clays and upper shallow-water clay-gyttja. Analysis of diatoms, pollen and loss-on-ignition, together with radiocarbon datings, were carried out to determine and date the isolation event of the lake. The results show that the lake was isolated ca. 2400 14C years BP and that the coarse grained layer was deposited prior to the isolation. The reconstruction of the emergence of the lake basin area suggests that the coarse grained layer originated from strong wave erosion of the shores before the isolation. This interpretation is supported by the presence of a wave-washed boulder belt on the NE slope of the basin. The isolation of Kruunuvuorenlampi lies exactly on the interpolated shore displacement model of the 30 m Litorina isobase. This placement suggests that no significant transgressions took place between the Litorina transgression and the isolation of Kruunuvuorenlampi. 相似文献
994.
新疆罗布泊地区第四纪环境演变 总被引:30,自引:1,他引:29
新疆罗布泊干湖盆中的K1钻孔揭示了该区第四纪沉积地层。孢粉分析表明,早更新世,当地发育森林-草原植被,中更新世以来,荒漠草原与荒漠交替出现,湖泊的发育可上溯至更新世。 相似文献
995.
996.
The bio-reef-chert suite is an important ore-bearing rock assemblage and one of the metallogenic rock suites of superlarge
ore deposits. It is formed as a fixed and ordered suite in space and time, and composed of different rocks formed by different
geological processes. It is the product of basin evolution at special stage in a special geological setting. It is also the
comprehensive product of normal sedimentary process, biological process in basin, hydrothermal sedimentary process under basin
base and magmatic process in the deep lithosphere. 相似文献
997.
Hydrothermal sedimentation characteristics of the Dajiangping superlarge pyrite deposit, Yunfu, Guangdong 总被引:1,自引:1,他引:0
The Dajiangping pyrite deposit is hosted in a carbonate-clastic rock series which is characterized by a bioreef-chert suite in its middle part.Conformable lenses of various sizes constitute the orebodies which often branch transitionally into the surroundings.Syngenetic deformation fabrics can be observed in orebody NO.3.Orebody No.4 is composed almost entirely of massive pyrite,with conspicuous hydrothermal sedimentation and bacterium-alga features.The hydrothermal sedimentation origin is also reflected by simple chemistry of the ore (predominated by quartz and pyrite),the presence of U and Th,and the REE compositions of pyrite and ankerite.The ores are rich in organic matter and the difference in organic content between the banded ores and the massive ores is mainly owing to the difference in the clastic components they contain rather than to the subsequent processes of reworking .Co/Ni rations in the ore may reflect the temperature pattern during hydrothermal sedimentation. 相似文献
998.
通过滇东寒武系筇竹寺阶和曲靖志留纪盆地的层序地层学、生物地层学研究,发现生物与海平面变化之间有一定的规律可寻。(1)物种形态响应:在滇东寒武系筇竹寺阶三叶虫演化序列中,这种响应反映为海平面下降过程有利于形成土著(原地)物种;而海平面上升则导致异地物种的迁入。(2)群落响应:每一个海平面变化旋回都要产生底栖海相群落的重组,形成新的生物组合。(3)种群响应:种群对海平面变化的响应通常表现为种群大小的波动,实质上是种群在不同生存环境中的不同表现。 相似文献
999.
汤原断陷第三纪地层研究新进展 总被引:12,自引:3,他引:9
主要从生物地层学、年代地层学和地球物理地层学三个方面,对汤原断陷近几年来地层研究的最新成果进行了简要论述,建立了19个化石组合、亚组合,认为本区存在古新统和上新统;获得了11个裂变径迹年龄数据;在地层倾角测井上识别出了4种沉积相变化模式;完善了本区第三系地层层序。 相似文献
1000.