日本地质调查所的两项海外活动概要     

白桦 《地质科技情报》1984,(3)

1.世界地质图委员会(CGMW)该委员会为国际地质科学联合会(IUGS)的下属组织,总部设在巴黎.该组织以世界各国国立地质调查研究机关为成员,亚洲国家绝大多数都参加了.该委员会的具体成果首先是1983年出版的亚洲地质构造图(4幅,1:500万),然后在此基础上以同样比例尺编制亚洲矿床分布图,预计在1984年早些时侯出版.亚洲矿床分布图也和亚洲地质构造图一样,包括了西至伊朗,北达蒙古,南迄印度尼西亚的广大范围.在以上编图工作中,日本完成了他所分担的各项任务.2.环太平洋编图计划该计划自1973年开始,为1974年成立的环太平洋矿物资源理事会活动中的一项.其宗旨是搜集环  相似文献   

通过微体化石向进化古生物学发展     

小泉格  白桦 《地质科技情报》1984,(4)

从历史发展上看微体化石的研究,过去主要都归入地层学、古海洋环境学、古气候学等地质学的问题里面.就其成果而言,就是在二十世纪七十年代在海洋地质学的领域中,通过微体化石的研究建立了古海洋学.这一贡献如使之再次返回到生物学的领域中来,那就是通过微体化石的研究重又建立起进化古生物学这门科学.这是因为微体化石具有其它化石所没有的若干特点,即(1)在时空上广泛分布并保有精确而详细的化石记录;(2)化石个体数非常多;(3)在同一样品中可同时出现其它微化石群;(4)产出于范围非常广泛的环境条件下;(5)形态上易受来自环境上的影响.以上特点加以灵活运用,就能制出具有一般合理性的新的古生物学上的模型,还可据以验证现有的某些模型.当然,要做到这些必须以生物学的概念结合统计学的方法,这就是最近微化石与进化古生物学相关联所取得成果的开始.  相似文献   

解算共线方程的迭代线性变换算法     

Nafet  AJ 周治雄 《测绘译丛》1992,(6):23-31

  相似文献   

南极罗斯造山带中寒武纪主要变形的证据     

Rowe  AJ 李瑞兰 《国外地质与勘测》1993,(1):1-5

  相似文献   

Sizing up the sub-Tommotian unconformity in Siberia     

Knoll AH  Kaufman AJ  Semikhatov MA  Grotzinger JP  Adams W 《Geology》1995,23(12):1139-1143

Sedimentary rocks in the western Anabar region, northwestern Siberia, preserve an exceptional record of evolution and biogeochemical events near the Proterozoic-Cambrian boundary. Carbon isotopic data on petrographically and geochemically screened samples collected at 1 to 2 m intervals support correlation of the lower Anabar succession (Staraya Reckha and lower Manykai Formations) with sub-Tommotian carbonates of the Ust'-Yu-doma Formation in southeastern Siberia. In contrast, the upper Manykai and most of the overlying Medvezhya Formation appear to preserve a sedimentary and paleontological record of an evolutionary important time interval represented in southeastern Siberia only by the sub-Tommotian unconformity. Correlation of the Anabar section with other northern Siberian successions that contain well-dated volcanic rocks permits the estimate that the sub-Tommotian unconformity in southeastern Siberia spans approximately 3 to 6 m.y. Diverse small shelly fossils (but not archaeocyathans) previously thought to mark the base of the Tommotian Stage evolved sequentially throughout this earlier interval.  相似文献   

PRO-GRADE: GIS toolkits for ground water recharge and discharge estimation   总被引：2，自引：0，他引：2  

Lin YF  Wang J  Valocchi AJ 《Ground water》2009,47(1):122-128

PRO-GRADE is an ESRI ArcGIS 9.2 plug-in package that consists of two separate toolkits: (1) the p attern r ecognition o rganizer for g eographic i nformation s ystem (PRO-GIS) and (2) the g round water r echarge a nd d ischarge e stimator for GIS (GRADE-GIS). PRO-GIS is a collection of several existing image-processing algorithms into one user interface to offer the flexibility to extract spatial patterns according to the user's needs. GRADE-GIS is a ground water recharge and discharge estimation interface using a mass balance method that requires only hydraulic conductivity, water table, and bedrock elevation data for simulating two-dimensional steady-state unconfined aquifers. PRO-GRADE was developed to assist ongoing assessments of the water resources in Illinois and Wisconsin, and is being used to assist several ground water resource studies in several locations in the United States. The advantage of using PRO-GRADE is to enable fast production of initial recharge and discharge maps that can be further enhanced by using a follow-up ground water flow model with parameter estimation codes. PRO-GRADE leverages ArcGIS to provide a computer-assisted framework to support expert judgment in order to efficiently select alternative recharge and discharge maps that can be used as (1) guidelines for field study planning and decision making; (2) initial conditions for numerical simulation; and (3) screening for alternative model selection and prediction/parameter uncertainty evaluation. In addition, PRO-GRADE allows for more easy and rapid correlation of those maps with other hydrologically relevant geospatial data.  相似文献   

Nutrient budgets for European seas: a measure of the effectiveness of nutrient reduction policies   总被引：3，自引：0，他引：3  

Artioli Y  Friedrich J  Gilbert AJ  McQuatters-Gollop A  Mee LD  Vermaat JE  Wulff F  Humborg C  Palmeri L  Pollehne F 《Marine pollution bulletin》2008,56(9):1609-1617

Socio-economic development in Europe has exerted increasing pressure on the marine environment. Eutrophication, caused by nutrient enrichment, is evident in regions of all European seas. Its severity varies but has, in places, adversely impacted socio-economic activities. This paper aims to evaluate the effectiveness of recently adopted policies to reduce anthropogenic nutrient inputs to European seas. Nitrogen and phosphorus budgets were constructed for three different periods (prior to severe eutrophication, during severe eutrophication and contemporary) to capture changes in the relative importance of different nutrient sources in four European seas suffering from eutrophication (Baltic Proper, coastal North Sea, Northern Adriatic and North-Western Black Sea Shelf). Policy success is evident for point sources, notably for P in the Baltic and North Seas, but reduction of diffuse sources has been more problematic.  相似文献   

北美东部中生代盆地勘探概况     

Pyron  AJ 徐景君 《国外石油地质》1999,21(1):13-15

在美国东部中生代裂谷盆地发现了重要的油气储量。由于其地层年代定位在三叠纪和侏罗经之间,所以要用中生代来描述这些盆地。北美东部中生代盆地从新斯科舍的拉布拉多陆架延伸到佛罗里达的Ｐａｎｈａｎｄｌｅ。随着古生界晚期－中生代早期泛古陆的分离,这些盆地在拉伸活动中形成,很明显,这些裂谷盆地与北大西洋和欧－非板块同时形成。已经证明,非洲西北部含碎屑岩（砂岩,页岩和砾岩）地层的盆地与北美东部的盆地相似,与此同时  相似文献   

The effect of Prestige oil ingestion on the growth and chemical composition of turbot otoliths     

Morales-Nin B  Geffen AJ  Cardona F  Kruber C  Saborido-Rey F 《Marine pollution bulletin》2007,54(11):1732-1741

Juvenile turbot (Scophthalmus maximus) were kept in captivity and were fed a prepared food contaminated with five different concentrations of seawater-accommodated fuel oil from 2.4+/-0.35 to 48.2+/-2.2 mg g(-1) food, with a control group receiving uncontaminated food. The growth and survival of individually tagged fish (N=202) were measured after a six-week treatment period. The otolith growth rate was measured and otolith composition was determined before and after the treatments using LA-ICPMS. Fish and otolith growth were negatively affected by the fuel oil treatment, and the response decreased with the level of contamination. Otolith growth and element incorporation peaked at mid level exposures and decreased at the highest level. The otolith elemental composition reflected the presence of some elements in the Prestige fuel that may have been incorporated through the diet into the otolith.  相似文献   

Effects of alumina refinery wastewater and signature metal constituents at the upper thermal tolerance of: 2. The early life stages of the coral Acropora tenuis     

Negri AP  Harford AJ  Parry DL  van Dam RA 《Marine pollution bulletin》2011,62(3):474-482

The success of early life history transitions of the coral Acropora tenuis were used as endpoints to evaluate thermal stress and the effects of wastewater discharged to a tropical marine environment. The studies assessed the effects of: (i) temperature; (ii) three signature metals of the wastewater, aluminium (Al), vanadium (V) and gallium (Ga); and (iii) the wastewater (at 27 °C and 32 °C) on fertilisation and larval metamorphosis. The median inhibition temperatures for fertilisation and metamorphosis were 32.8 °C and 33.0 °C, respectively. Fertilisation IC₅₀s for Al, V and Ga were 2997, 2884 and 3430 μg L⁻¹, respectively. Metamorphosis IC₅₀s for Al, V and Ga were 1945, 675 and 3566 μg L⁻¹, respectively. The wastewater only affected fertilisation and metamorphosis at moderate concentrations (IC₅₀s = 63% and 67%, v/v, respectively, at 27 °C), posing a low risk to this species in the field. The effects of wastewater and temperature on fertilisation and metamorphosis were additive.  相似文献