OSL and TL dating of buried podsols and overlying sands in Ostrobothnia,western Finland     

G. Hütt  H. Jungner  R. Kujansuu  M. Saarnisto 《第四纪科学杂志》1993,8(2):125-132

In Ostrobothnia, western Finland, buried fossil soils have been recognised in a number of places in the sandy sediments that occur between glaciofluvial deposits and overlying till. Samples from the soil horizons as well as below and above them were taken for optically stimulated luminescence (OSL) dating. The same sites were also sampled for thermoluminescence (TL) dating. Altogether five TL dates and seventeen OSL dates were obtained. The OSL dates can be grouped into two age classes, (i) 120-163 ka and (ii) 76-106 ka, whereas all TL dates are of the order 135-155 ka. A comparison between the results obtained from the two dating methods shows that OSL dates are generally younger than the TL dates for the same sample. The discrepancy may arise partly from problems of setting a correct residual level in TL dating. If this is the case then the TL dates may indicate an upper limit for the true age. The results support the geological interpretation that the fossil soils were formed during the last interglacial, that the soil-forming processes possibly also continued during the first Early Weichselian stadial and interstadial (Brørup sensu lato), and that in general the till-covered glaciofluvial sequences, interpreted as eskers in Ostrobothnia, were deposited during the Saalian or Early Weichselian deglaciation.  相似文献   

Molecular Weight Distribution of Dissolved Organic Matter in Lake Hongfeng Determined by High Performance Size Exclusion Chromatography （HPSEC） With On-Line UV-Vis Absorbance and Fluorescence Detection     

岳兰秀  吴丰昌  刘丛强  黎文  王静  梅毅 《中国地球化学学报》2004,23(3):275-283

1IntroductionDissolvedorganicmatter (DOM)isamixtureoforganicsubstancesconsistingmainlyofhighmolecularweightpolymericcompounds (KenandLee,1 974) .Itplaysanimportantroleincarboncyclingandbiogeochemicalmobilizationoftracemetalsandorganiccompoundsintheaquaticenvi ronment (BeffleandLeppard ,1 995) .InrecentyearsmanyresearchershavepaidattentiontothesecomplexesbasedontheMWDofDOM ,sincethefateandtransportoftracechemicalsareinfluencedbyitsmolecularsize (Chiouetal.,1 986) .Themolecularweightorfrac…  相似文献   

古鹿角化石内的黄铁矿结晶形态     

叶涛  彭长琪  叶先贤 《矿物学报》2006,26(2):215-218

本文应用扫描电子显微镜(SEM)对长江武汉阳逻段江底沉积岩中古生物化石进行了分析研究,在动物鹿角化石剖面的孔隙边缘,发现了许多尚未人知的结晶团聚体。这些结晶团聚体经扫描电镜、X射线能谱分析(EDS),确定为黄铁矿晶体。研究表明,这些黄铁矿晶体以不同形态寄生于孔洞边缘,在特定的外界条件及环境下形成了这些黄铁矿结核。本研究可为探索生物矿化过程提供一些新的依据。  相似文献   

利用油包裹体丰度识别古油藏和限定成藏方式   总被引：8，自引：0，他引：8  

王飞宇  师玉雷  曾花森  刘可禹 《矿物岩石地球化学通报》2006,25(1):12-18

储集层中残留烃类数量指示了它在地质历史中的古含油饱和度,它包括赋存于孔隙和裂隙之中的烃类和胶结物中的烃类流体包裹体,目前采用的分析技术有储层可溶烃数量和成分(抽提、TLC-FID、HPLC、ROCK-EVAL),油包裹体丰度(含油包裹体颗粒指数GOI,荧光颗粒定量QGF)、储层固体沥青数量(SBI)与流体包裹体地层学(FIS)。利用油包裹体丰度可识别古油藏,判识古油水界面(POWC),寻找再运移石油,确定天然气或凝析气藏早期是否有石油充注事件,识别次生油藏,寻找下伏油藏,限定油气充注模式。本文以塔里木盆地牙哈凝析气气藏与英南2气藏为例,展示了如何利用油包裹体丰度识别古油藏和限定成藏方式。  相似文献   

Hugh Miller: fossils, landscape and literary geology     

Simon J. Knell 《Proceedings of the Geologists' Association. Geologists' Association》2006,117(1):85-98

  相似文献   

A survey of pyritised animal,plant, and trace fossils and concretionary pyrites,Germav Formation,southeastern Turkey     

Cemal Bölücek  Burhan Ilhan 《Comptes Rendus Geoscience》2006,338(3):161-171

The sulphide-bearing rocks of the Upper Cretaceous Germav Formation in southeastern Turkey (Bozova–Urfa) and the morphologically varied sulphide occurrences they contain have been investigated. Pyrite and marcasite are the main sulphide minerals; lesser bravoite and millerite also occur. Pyritised branches and leaves, trace fossils, and animal microfossils and macrofossils are abundant. Most of the concretionary and authigenic concretionary pyrite occurrences are probably related to burrows. The concretionary pyrites have low Co and high Ni contents and low Co:Ni ratios. The pyrite-rich lithostratigraphic sequences were deposited in a deep-sea environment, and pyrite mineralization developed in syn-sedimentary, early diagenetic and epigenetic stages under anoxic conditions. To cite this article: C. Bölücek, B. Ilhan, C. R. Geoscience 338 (2006).  相似文献   

吉林省中东部晚中生代含煤地层中的木化石     

李东津  吴昌桓 《世界地质》2007,26(3):267-274

通过对吉林省晚中生代含煤地层中木化石的系统调查，共采集162块木化石，均属裸子植物，共5属8种。其中出现频率最高者为异木属，其次为落羽杉型木属等，Taxadiorylon albertense，T．pseudonlbertense两种在中国为首次发现。笔者将木化石称Xenoxylon latiporosum-Taxodioxylon pseudoalbeltense组合。研究表明，异木属主要生长在温湿的温带气候环境；据目前的资料还不能证明该属是适应能力极强的树种。本文还记述了上述木化石产出的地质概况，并探讨了其地质意义和古环境。  相似文献   

The First Observation on Plant Cell Fossils in China          下载免费PDF全文

WANG Xin CUI Jinzhong 《《地质学报》英文版》2007,81(1):16-22

For a long time, paleontologists have been focusing on hard parts of organisms during different geological periods while soft parts are rarely reported. Well-preserved plant cells, if found in fossils, are treated only as a rarity. Recent prowess in research on fossil cytoplasm indicates that plant cytoplasm not only has excellent ultrastructures preserved but also may be a quite commonly seen fossil in strata. However, up to now there is no report of plant cell fossils in China yet. Here plant cell fossils are reported from Huolinhe Coal Mine （the early Cretaceous）, Inner Mongolia, China. The presence of plant cytoplasm fossils in two cones on the same specimen not only provides further support for the recently proposed hypothesis on plant cytoplasm fossilization but also marks the first record of plant cytoplasm fossils in China, which suggests a great research potential in this new area.  相似文献   

沾化凹陷新近系沉积物的C、O、Sr、Nd同位素组成变化对古环境变迁的记录   总被引：1，自引：0，他引：1  

蔡观强  郭锋  刘显太  隋淑玲  李超文  高晓峰  赵亮 《地球化学》2007,36(6):569-577

沾化凹陷新近系馆陶组(Ng)广泛发育了一陆相螺化石层.来自螺化石层上下沉积层位的馆陶组和明化镇组(Nm)泥灰岩的C、O、Sr、Nd同位素的分析结果显示,螺化石层所在Ng4段泥灰岩具有比其上下部泥灰岩较低的δ13C值和较高的δ18O值,而螺化石埋藏层位的泥灰岩具有相对较低的δ13C和87Sr/86Sr值以及相对较高的δ18O值.143Nd/144Nd比值在剖面上的变化不明显,反映Ng、Nm沉积时期凹陷具有稳定的物源区;而C、O、Sr同位素组成的系统变化则指示了古沉积环境的变化.其中Ng4段沉积时期气候相对干热,Ng3、Nm1 2段沉积时期气候相对湿热;螺化石层泥灰岩所表现出的低87Sr/86Sr值和螺化石壳体相对高的δ13C和δ18O值可能代表了区域上一次重要的气候干热化事件,该时期大气降水明显减少,湖泊蒸发量较大,使得盆地的水体盐度增加,水体中87Sr/86Sr降低和δ18O值增加,同时水体营养生物和河流输入的营养物质减少,致使田螺最终死亡.随后环境气候相对湿热,生物生产力提高和碎屑物质供应的增加使得87Sr/86Sr值和δ13C值增加,大气降水补给导致沉积介质的δ18O值降低.  相似文献   

渤海湾盆地东营凹陷古近纪Paleodictyon遗迹化石的发现及其意义   总被引：2，自引：0，他引：2  

袁文芳  陈世悦  曾昌民  胡斌 《地质科学》2007,42(4):779-786

在东营凹陷古近纪沙河街组四段浊流沉积中,发现遗迹化石Paleodictyon的两个遗迹种,即Paleodictyon regulare和Paleodictyon majus;对其围岩地球化学特征的研究则发现有指示海侵发生的甲藻甾烷分子化石发育,据此推测研究区古近纪的沉积与海水相关。  相似文献