滇东地区早寒武世磷块岩的藻类化石

滇东早寒武世磷块岩薄片中发现大量藻类化石。本文所讨论的磷质藻类化石主要有:球状藻类、丝状藻类、疑源类、叠层石类、核形石类和花纹石类(凝块石类)等27个属种(或型),它们构成各种颗粒磷块岩、叠层石磷块岩、藻丘磷块岩,是磷块岩富矿的主要组分,P_2O_5可达30—37％。这些多门类的藻类化石,为生物成磷作用和成矿环境提供了主要依据,也为震旦—寒武系界线划分提供了新的资料。     

峨眉山早二叠世的苔藓虫化石

峨眉山早二叠世地层发育,化石丰富,含大量苔藓虫化石。栖霞组以Fenestella sp.(A)为特征,茅口组下部以Araxopora hayasakai最丰富,上部则以Meekopora emeishanensis(sp.nov.)为特色。Meekopora属在我国过去仅发现于石炭系,现该属首次在蛾眉山下二叠统中发现,其层位大致相当子北美早二叠世的瓜达卢普组(Guadalupian)。     

High-quality hydrocarbon source rock in the Paleogene sequence of the Ping Chau Formation, Hong Kong

Although petroleum exploration is being conducted in the Hong Kong region, high-quality hydrocarbon source rocks have never been found in this area. The Ping Chau Formation is only Mesozoic-Cenozoic sedimentary rock exposed in Hong Kong and its surrounding areas. The hydrocarbon source rock of the Ping Chau Formation is very rich in organic matters, which has an average total organic carbon (TOC) of 1.9% and chloroform bitumen ““A““ range from 0.14% to 0.24%. The total hydrocarbon content varies from 880 to 1800 ppm and the transformation ratio is specific from 5 to 9. The index of pyrolytic hydrogen is up to about 600 mgHC/gTOC. These data demonstrate the characteristics of the high-quality hydrocarbon source rock. The lamalginite is the major maceral of the source rock of the Ping Chau Formation, and geochemical characteristics also suggest that the organic materials of the source rock are of type I and type Ⅱ1, with abundant gammacerane, γ, β-caro-tane and C24 tetracyclic terpane, which indicate that it was formed in the salt water and brackish water sedimentary environment, and the source rock has evolved into a mature phase. The organic inclusions are found within calcite veins in cracks of the source rock, indicating that hydrocarbon has been generated and a secondary migration has happened. The source rock in the Ping Chau Formation is about 200-300 m thick, thus having considerable hydrocarbon potential. The discovery of the high quality hydrocarbon source rock in the Ping Chau Formation will certainly provide insight on hydrocarbon resource exploration in the South China Sea area.     

川北早志留世似包珊瑚属的两个新种

在采自四川广元和朝天一带早志留世王家湾组的材料中发现具典型包珊瑚型隔壁,发育三级隔壁的单体珊瑚新类群.该类群边缘厚结带窄,一级隔壁长,几乎可达个体中心;二、三级隔壁短,隔壁由层状组织组成,横板完整,近平列状或密集成束状,无鳞板.基本特点与似包珊瑚属(Amplexoides Wang,1947)最为接近,因而暂将该类群归入包珊瑚属,共有两个种:Amplexoides trioseptatus sp. nov., Amplexoides modaoyaensis sp. nov..根据新资料补充了似包珊瑚属的部分属征,讨论了Amplexoides Wang的主要类群、构造特点及其演化,并系统描述了两个新种.     

青藏高原东部玉树隆宝蛇绿混杂岩中早二叠世放射虫的发现及其地质意义

报道了采自青藏高原东部玉树隆宝蛇绿混杂岩硅质岩岩块中的放射虫化石.该放射虫组合包括Latentifistula crux Nazarov et Ormiston,Pseudoalbaillella scalprata scalprata Holdsworth et Jones,Pseudoalbaillella scalprata rhombothoracata Ishiga,Pseudoalbaillella sakmarensis(Kozur)等.该放射虫组合属于Pseudoalbaillella scalprata rhombothoracata带,该带可以进行全球对比,地质时代为早二叠世.放射虫动物群与可可西里、滇西等地的古特提斯放射虫组合一致,它指示了玉树早二叠世存在深水沉积盆地.     

黑龙江省东部早中生代火成岩研究现状

黑龙江省东部早中生代火成岩带的构造组合复杂,吸引着各方专家的研究探讨,探讨其形成的区域构造动力学及地球动力学机制,具有重要的地质意义.     

新陆早9号特征特性及高产栽培技术要点

<正>新陆早9号由兵团农七师农科所育成,1999年引进我团,当年种植1000平方米,经过海南岛加代南繁,2000年继续进行品种区试2.3公顷,2001年进入大田示范,综合表现良     

西昆仑虫古生代构造演化及其对塔西南盆地的影响

在板块构造理论基础上，通过区内蛇绿岩，与府冲有关的浆岩及相关沉积等综合研究，对西昆仑早古生代构造演化进行了重建；震旦纪－寒武纪西昆仑从里木陆分裂出去，并在它们之间形成“昆仑洋”；寒武纪－奥陶纪“昆仑洋洋壳南俯冲于西仑之下，形成库地俯冲带、库地弧前盆地、昆仑早古生代火山弧及麻扎－黑卡弧后盆地。     

An early cretaceous<Emphasis Type="Italic">Ginkgo</Emphasis> ovule-bearing organ fossil from Liaoning,Northeast China and its evolutionary implications

Ginkgo is a very important gymnospermous genus that has only one surviving species, Ginkgo biloba L. As a so-called “living fossil“, wild Ginkgo was found only in China, but it once flourished well and had a world-wide distribution in the Mesozoic. The earliest Ginkgo has been known from the Middle Jurassic, based on ovule-bearin gorgans. In the Jurassic and Early Cretaceous, Ginkgo was one of the dominant gymnosperms in floras and possibly one of the coal-forming plants in North China. During the Early Tertiary, it reduced to a circumpolar distribution in the North Hemisphere; only a few reported from the South Hemisphere. From the Pliocene onwards, the Ginkgoales has been represented by the extant monotypic “living fossil“ Ginkgo biloba.     

Study of β—amyloid adsorption and aggregation on graphite by STM and AFM

The scanning tunneling microscopy(STM) and the atomic force microscopy(AMF) have been applied to the direct study of the adsorption and aggregation of β-amyloid(1-42)(Aβ42)on the hydrophobic graphite surface.It was found that Aβ42 were preferentially adsorbed on graphite defects such as the edges.Aβ42 peptides self-assembled into intermediate protofibrils,which in turn self-associated to form fibrils.Usually,two or more fibrils intertwined to form the helical structure.These results will provide an important clue to studying the aggregation process of β-amyloid.