贵州关岭上三叠统瓦窑组中碳酸盐岩结核形成的生物作用   总被引：6，自引：0，他引：6  

王尚彦  王宁等 《地质通报》2002,21(12):855-857

贵州省关岭县新铺乡附近的晚三叠世早期地层瓦窑组底部产具重大科学意义的关岭生物群。关岭生物群产出地层中伴有大量大型碳酸盐岩结核。这些结核中部都有植物茎干,结核内的海百合、双壳、菊石、牙形刺等生物化石含量明显高于结核周围的岩石,且有许多生物化石直接附着在植物茎干上。这类结核的形成,除化学沉积作用外,还有生物作用的影响。海百合、双壳类和菊石类栖息在植物茎干上营假浮游生活,随着栖息生物量和化学沉积物灰泥的增加,逐渐沉积在海底形成结核。  相似文献   

The carbon isotopic ratio of atmospheric carbon dioxide at Tsukuba,Japan   总被引：1，自引：0，他引：1  

Hisayuki Inoue  Yukio Sugimura 《Journal of Atmospheric Chemistry》1985,2(4):331-344

To find out the secular and seasonal trends of the ¹³C value and CO₂ concentration in the surface air and the determination of the ¹³C in the atmospheric CO₂ collected at Tsukuba Science City was carried out during the period from July 1981 to October 1983. The monthly average of the ¹³C value of CO₂ in the surface air collected at 1400 LMT ranged from -7.52 to \s-8.45 with an average of -7.96±0.25 and the CO₂ concentration in the air varied from 334.5 l 1^-1 to 359 l 1^-1 with an average of 347.2±6.3 l 1^-1. The ¹³C value is high in summer and low in winter and is negatively correlated with the CO₂ concentration. In general, the relationship between the ¹³C and the CO₂ concentration is explainable by a simple mixing model of two different constant carbon isotopic species but the relationship does not always follow the model. The correlation between the ¹³C value and the CO₂ concentration is low during the plant growth season and high at other times. The observed negative deviation of the ¹³C value from the simple mixing model in the plant growth season is partly due to the isotopic fractionation process which takes place in the land biota.  相似文献   

Metal concentration in biota in the North sea: changes and causes     

Pedersen  Britta 《ICES Journal of Marine Science》1996,53(6):1008-1013

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云南含罗平生物群层位锶同位素组成与演化          下载免费PDF全文

谢韬  胡世学  周长勇  张启跃  黄金元  文芠 《中国地质》2019,46(3):642-650

现有公布的数据显示,海水87Sr/86Sr值在中三叠世安尼期较为平稳,有别于早三叠世因环境导致的动荡变化,为二叠纪末生物大灭绝之后生物复苏的加速期,而罗平生物群就是该加速期的标志性生物群。本文研究了含罗平生物群层位标准剖面-大凹子剖面上连续沉积的26件碳酸盐岩样品的锶同位素组成与演化,用于了解含罗平生物群层位沉积海水锶同位素的变化趋势。结果显示:(1)碳酸盐岩中Sr平均值大于2000×10-6,主要来自于文石和海洋成岩作用;(2)低Mn和Mn/Sr0.4说明:87Sr/86Sr数据在很大程度上能代表同时期海水中的87Sr/86Sr比值;(3)这些样品的87Sr/86Sr值变化在0.707969～0.708253,平均值为0.708025,锶同位素比值变化曲线呈小幅度的起伏波动,其值明显大于同时期欧洲等地公布的数据,但同华南其他地区公布的数据具有相似性,推测含罗平生物群层位锶同位素组成仅代表区域事件,受印支运动影响。  相似文献   

贵州瓮安埃迪卡拉系陡山沱组上段底部和下段的遗迹化石     

王约  徐一帆 《现代地质》2007,21(3):469-478

贵州瓮安地区埃迪卡拉系陡山沱组上段产有保存良好的具有生物多样化特征、包含多种门类磷质球粒状化石库的“瓮安生物群”,成为地球早期生物特别是早期后生动物和动物胚胎化石研究的焦点地区。描述了产自瓮安陡山沱组“瓮安生物群”产出层位底部和之下层位的3个后生动物遗迹：Wenganichnus nanbaoensis（ichnogen. et ichnosp. nov.）为具有衬里和半月形回填构造的微弯曲的潜穴管; Doushantuoichnus curvatus（ichnogen. et ichnosp. nov. ）为具有细小横纹脊的中沟和两排呈叠瓦状排列的小羽叶状凸起的表生迹;?Planolites ichnosp. 为任意弯曲的、与围岩岩性略有区别的长线状底迹突起。遗迹化石的形态特征表明它们的造迹生物为沿一定方向运动的、背部与腹部以及前部与后部分化的、两侧对称的蠕虫状后生动物,而非沉积构造。“瓮安生物群”中后生动物的卵和胚胎化石可能系不易保存的软躯体动物的卵和胚胎在水动力作用下与沉积物一起被搬运、沉积,埋藏于较高能浅水环境并处于休眠状态,且被保存。  相似文献   

Sedimentological features and biostratigraphy of Jurassic/Cretaceous deposits in continental basins in Priamurie, Far East Russia     

G.L. Kirillova  G.V. Roganov  V.V. Kiriyanova 《世界地质(英文版)》2010,13(1):1-19

The paper describes the sedimentary features and biostratigraphy of the transitional Jurassic to Cretaceous deposits in the continental basins of Priamurie formed after the collision between the Siberian and North China blocks. In Upper Priamurie, the collision occurred in the late Early Jurassic as dated by the emplacement of the post-collisional granites (191Ma) . While in Lower Priamurie and West Priokhotie it could take place in the late Middle Jurassic on the basis of fossil evidence from an accretionary turbidite complex. This event reflected the environmental change from coastal-marine to alluvial plains, often boggy, where coals accumulated. The environmental change is in harmony with that of biota. Systematic study of floral and spores/pollen assemblages, particularly in the sections of interbedded marine and non-marine deposits, makes clear the chronostratigraphic succession of floral associations and shows the possibility of their application for subdivision and correlation of the continental deposits of Priamurie. The coastal-marine environment of the residual post-collisional sublatitudinal basins in the western part of Priamurie (Upper Amur and Dep basins) was replaced by the continental in the late Middle Jurassic and in the eastern part in the Berriasian-Valanginian ( Torom Basin) . Similar environmental change commenced in the submeridional rift basins: the Bureya Basin in the Callovian and the Partizansk Basin in the Hauterivian. Changes in ecosystems occurred frequently during theMiddle Jurassic-Neocomian, but the most substantial changes took place in the late Middle Jurassic and in the end of Late Jurassic.  相似文献   

Organochlorine pesticides in marine environment of Quanzhou Bay, Southeast China     

Qiuke SU Shihua QI Chengxi WU Julia E. Burnet Huafeng LIU Min FANG Jun LI Gan ZHANG 《中国地球化学学报》2006,25(B08):190-190

As one of the most important buildup of persistent organic pollutants （POPs）, organochlorine pesticides （OCPs） have received more and more attention. Samples including sediments, water and marine products were collected. In the lab, nineteen types of organochlorine pesticides were tested using GC-ECD following US-EPA 8080A method. In the top sediments, the concentration of HCHs was 0.1-3.08 ng/g and the concentration of DDTs was 3.53-75.83 ng/g. In the bottom sediments, the concentration of HCHs was 0.1-3.59 ng/g and the concentration of DDTs was 1.56-81.68 ng/g. The concentration ranges of HCHs and DDTs in sea water were 1.31-9.96 ng/L and 0.78-6.51 ng/L, respectively. And the concentration ranges of HCHs and DDTs in land surface water were 7.04-14.08 ng/L and 3.82-9.66 ng/L, respectively. The residual levels of HCHs and DDTs in marine product samples ranges from 0.1 to 0.6 ng/g and from 0.57 to 85.02 ng/g, respectively. In this thesis, discussions of DDTs and HCHs in sediment, water and marine product samples were made. The following are the main results and conclusions： A general decreasing trend was found from the inner to outer sectors of the Bay for both sediment and water samples. The distribution of OCPs depends greatly on the different properties pertaining to them. The topography, redox, hydrodynamic condition as well as other factors also play an important role in controlling the distribution and fate of OCPs.  相似文献   

瓮安生物群中后生动物化石研究进展及问题讨论   总被引：3，自引：0，他引：3       下载免费PDF全文

刘鹏举  尹崇玉  唐烽  高林志  王自强 《地质论评》2007,53(6):728-735

贵州瓮安埃迪卡拉（震旦）纪陡山沱期磷酸盐化生物群具有生物多样性特征，包含有蓝菌、多细胞藻类、疑源类、后生动物休眠卵及胚胎、可疑的海绵动物、管状后生动物和微小两侧对称的后生动物等化石类型，是迄今为止全球保存最为完好的晚前寒武纪磷质化石库。瓮安陡山沱组磷质岩提供了早期生命从简单到复杂进化过程中的重要化石记录，展示了埃迪卡拉生物群出现以前早期多细胞生物的生命景观，为研究晚前寒武纪生物圈面貌提供了一个重要的埋葬学窗口。近来，通过醋酸浸解法，在贵州瓮安陡山沱期含磷地层中发现了大量疑似后生动物的实体化石（包含了所有已经报道的类型或与之相似的化石类型）新材料，为了解这些化石的内部构造特征，将一些化石包埋后制作了定向薄片。基于上述化石新材料，结合定向薄片的研究和前人的研究成果，本文详细介绍了瓮安生物群中后生动物化石研究的新进展和存在的问题。  相似文献   

发达地区乡村空间商品化的过程与机制解析——以苏州市西巷村为例   总被引：2，自引：1，他引：1  

胡晓亮  李红波  张小林  杨嘉惠 《地理科学进展》2021,40(1):171-182

随着城镇化的快速推进,中国乡村经历着剧烈的转型与重构,乡村地区的建筑民居、生态景观、文化遗产等物质与非物质空间要素的潜在价值逐步显化,乡村空间商品化的态势逐渐显现。论文以苏州市吴中区西巷自然村为案例,采用田野调查、非结构化访谈等方式,开展发达地区乡村空间商品化的过程与机制研究。研究发现：乡村空间商品化是在市场经济条件下,乡村空间本身逐渐成为商品被“销售”,进而获取一定利润的过程,该过程的空间内涵体现在空间表征与空间实践2个层面。从空间表征来看,西巷村空间商品化由乡村空间中农产品的商品化扩展到乡村空间本身的商品化,并且伴随着由单一的农业生产空间向生产与消费相结合的多功能空间转变,更加注重营销空间品质与体验等非实体产品。从空间实践来看,基于行动者网络理论视角,西巷村空间商品化是由村庄内外部多元异质主体的一系列实践推动,各行动者能获取共同利益是其得以联结形成网络的基础条件,网络中非人类行动者的主体性与能动性需要得到充分重视。  相似文献   

Permian biostratigraphy of the northern Okhotsk region (Northeast Asia)     

A. S. Biakov 《Stratigraphy and Geological Correlation》2007,15(2):161-184

Fossil biota and detailed biostratigraphy of the Permian northeastern Okhotsk and Ayan-Yuryakh sedimentary basins located in the northern Okhotsk region are characterized. The biota core is represented by bivalves associated with gastropods, brachiopods, and other faunal groups. It is shown that a new regional stratigraphic scale of northeastern Russia based on brachiopods and bivalves may be used for subdivision of Permian sections in these basins. Fossil assemblages have many features in common with their counterparts from the Verkhoyansk region; at the same time, there are endemic species and the big group of species characteristic of the Omolon basin. The upper part of the Khivach regional horizon is subdivided into subzones based on the evolutionary lineages of the Maitaia and Intomodesma genera. Changes in the taxonomic composition of coeval communities in different basins are shown to be largely controlled by the basin depths and facies environments. Impoverished fauna of the Ayan-Yuryakh basin was less diverse in taxonomic aspect, represented almost entirely by bivalves (mostly Inoceramus-like) accompanied by rare gastropods. The discovered taxa are figured in majority, and table of their stratigraphic distribution is presented.  相似文献