新疆胜利达坂金矿区韧性剪切带与金矿关系   总被引：5，自引：0，他引：5  

王居里  刘养杰 《西北地质科学》1994,15(2):20-26

胜利达坂韧性剪切带是胜利达坂金矿区主要的控矿和容矿构造，控制着区内矿床、矿体及矿化体的分布。矿体、矿化体主要产于剪切带内的Ｄ、Ｐ、Ｒ型剪切裂隙中。成矿与剪切带的演化密切相关。成矿的有利部位是剪切带的边缘及次级剪切带问的过渡地带，它们是剪切带内应力梯度变化大的地带。  相似文献   

南海北部鱼类石油烃含量地理差异原因浅析   总被引：1，自引：0，他引：1  

甘居利  贾晓平 《广东海洋大学学报》1998,(1)

比较了南海北部海洋鱼类石油烃含量的地理差异,结果表明：被研究的5个海区中,广州湾海洋鱼类的石油烃含量明显高于北部湾（p＜0.05）和红海湾（P＜0．05）,该3个海区和珠江口明显高于台湾浅滩（p＜0.01）,其余的两两之间没有统计学差异（p＞0．05）。利用海洋环境质量调查和监测资料进行分析,说明这种地理分布特征与南海北部近岸海域的石油烃污染有直接关系。  相似文献   

红海湾底质硫化物的分布和变化     

甘居利  贾晓平  林钦  王增焕 《广东海洋大学学报》1998,(4)

根据南海区半封闭型海湾规模化养殖技术研究的需要,对红海湾底质硫化物进行了研究。用碘量法分析的结果表明：红海湾底质中硫化物含量的区域分布极不均匀,呈北部河口区＞虾池＞鱼湾＞中部＞南部自然水域＞礁滩区的特点。虾池、鱼的硫化物含量清淤前分别为清淤后的8.4、3．6倍;湾南部硫化物含量春季明显高于夏季,其余区域的两季差异不明显。46份样品中约13％、28％分别超过国内外评价标准,超标测站位于河口和清淤前的虾池、鱼。礁滩护养增殖区、南部自然水域、湾中部牡蛎养殖区和清淤后的虾池、鱼尚未见硫化物的污染。  相似文献   

南天山东段榆树沟-铜花山巨型构造混杂带的发现及意义     

陆关祥周鼎武  王居里张成立 《地质论评》2004,50(2):120-124,i003,i004

通过遥感构造综合解析，认为南天山东段榆树沟-铜花山地区为一巨型构造混杂带。该构造带可划分为南部和北部的两带变质褶皱地层系统、中带的构造混杂系统和不同期次的岩浆侵入体。结合同位素定年和岩浆侵入的综合对比与研究，认为该地区先后经历了五期构造运动，分别为：①南北向逆冲推覆，②北西西向左行走滑，⑧北西西向右行走滑，④南北向逆冲推覆，⑤北北西、北东向断裂。  相似文献   

生态环境地质调查与3S技术应用——以川南安宁河流域生态环境地质调查为例     

许向宁  黄润秋  秦举礼 《地质通报》2003,(Z1)

通过历时2年的安宁河流域生态环境地质调查试点,结合大量前人资料和多时段的遥感解译成果综合分析,充分利用3S技术和信息技术,探索和总结出一套针对性、实用性和可操作性很强的生态环境地质调查与评价方法体系,为编制生态环境地质调查技术要求打下了良好的基础,也为其他地区生态环境地质调查提供可借鉴的经验和示范。系统全面地阐述了生态环境地质调查特点、思路、体系构架和3S技术的应用,重点阐述了RS在生态环境地质调查中的应用、GIS技术在生态环境地质评价中的应用以及生态环境地质GIS空间数据库的建立。  相似文献   

A spatio-temporal econometric model of regional growth in Spain   总被引：2，自引：2，他引：0  

Miguel A. Márquez  Julián Ramajo  Geoffrey J. D. Hewings 《Journal of Geographical Systems》2010,12(2):207-226

In this paper, a combined cross-section and time-series econometric analysis of Spanish regional growth is presented. This analysis operates with a database where the number of cross-sectional units is small for a typical panel of data, while the time dimension is clearly dominant. First, using recent techniques in the econometric analysis of panel data (both panel unit root and panel co-integration tests), a co-integrating relationship between the level of regional output and the level of regional input factors is found, and the steady-state equilibrium production function is estimated. Second, a dynamic spatio-temporal panel error correction model is used in order to describe the short-run regional growth adjustment process in space and time. As conclusion, it is possible to identify significant spatial effects in the Spanish regional growth after controlling for temporal variation of the implied variables.  相似文献   

Variscan terrane of deep-crustal granulite facies in Yushugou area, southern Tianshan   总被引：3，自引：0，他引：3  

Runsan Wang  Dingwu Zhou  Juli Wang  Yan Wang  Yangjie Liu 《中国科学D辑(英文版)》1999,42(5):482-490

The Yushugou terrane of deepcrustal granulite facies in southern Tianshan consists of two parts, granulite and metaperidotite. The whole terrane is a metamorphism of (high-pressure) grunulite facies, and typical mineral associations are: Gt-Cpx-P1-Tit-Ilm (±Qz) (silica-saturated and oversaturated mafic rocks), Gt-Ky (pseudomorph)-P1-Ru-Ilm± Qz (metapelitic rocks) and Spi-Opx-Cpx-01 (meta-ultramafic rocks). The peak-stage P-T conditions are 795— 964°, 0.97—1.42 GPa, which are obtained with mineral chemistry, assemblage analyses and P-T estimation. The Sm-Nd isochron age of peak-stage metamorphic minerals is (315 ± 3.62) Ma. All of these indicate that the terrane is a deep-crustal body, which subducts to the depth of 40—50 km in the middle late-Paleozoic, undergoing metamorphism of (high-pressure) granulite facies, and exhumed again to the surface by tectonic uplifting. Project supported hy the National Natural Science Foundation of China (Grant No. 49472135).  相似文献   

Post‐fire hydrological response and suspended sediment transport of a terraced Mediterranean catchment          下载免费PDF全文

Julián García‐Comendador  Josep Fortesa  Aleix Calsamiglia  Adolfo Calvo‐Cases  Joan Estrany 《地球表面变化过程与地形》2017,42(14):2254-2265

In July 2013, a wildfire severely affected the western part of the island of Mallorca (Spain). During the first three post‐fire hydrological years, when the window of disturbance tends to be more open, the hydrological and sediment delivery processes and dynamics were assessed in a representative catchment intensively shaped by terracing that covered 37% of its surface area. A nested approach was applied with two gauging stations (covering 1.2 km² and 4.8 km²) built in September 2013 that took continuous measurements of rainfall, water and sediment yield. Average suspended sediment concentration (1503 mg L^?1) and the maximum peak (33 618 mg L^?1) were two orders of magnitude higher than those obtained in non‐burned terraced catchments of Mallorca. This factor may be related to changes in soils and the massive incorporation of ash into the suspended sediment flux during the most extreme post‐fire event; 50 mm of rainfall in 15 min, reaching an erosivity of 2886 MJ mm ha^?1 h^?1. Moreover, hysteretic counter‐clockwise loops were predominant (60%), probably related to the increased sensitivity of the landscape after wildfire perturbation. Though the study period was average in terms of total annual precipitation (even higher in intensities), minimal runoff (2%) and low sediment yield (6.3 t km^?2 y^?1) illustrated how the intrinsic characteristics of the catchment, i.e. calcareous soils, terraces and the application of post‐fire measures, limited the hydrosedimentary response despite the wildfire impact. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

Is delta-aminolevulinic acid dehydratase activity in bivalves from south-west Iberian Peninsula a good biomarker of lead exposure?     

Kalman J  Riba I  Blasco J  DelValls TA 《Marine environmental research》2008,66(1):38-40

The coast of Huelva is considered as a heavily contaminated area where the Tinto and Odiel rivers discharge after running through a metalliferous mining area in the Iberian Pyrite Belt and end in common estuary called Ría of Huelva. Lead is a highly toxic and widely distributed element in the aquatic environment; therefore there is a great interest in assessing the impact of this contaminant on aquatic organisms. To study the bioavailability and sources of lead, the bivalve species Chamelea gallina was collected from six sampling sites along the coast of Huelva. Besides the effect of this metal on the enzyme activity, delta-aminolevulinic acid dehydratase (ALA-D) was determined in the whole tissue. Results show the inverse relationship between the lead concentration and the activity of ALA-D measured in whole tissues (r2=0.7). Individuals collected from the Ría of Huelva estuary had the highest levels of total lead concentrations and the lowest activity of ALA-D. Lead isotope analyses demonstrated the different sources of lead contamination and also confirmed the influence of Ría of Huelva on the metal input to the marine environment.  相似文献   

珠江口水域化学耗氧量(COD)的分布特征   总被引：4，自引：1，他引：4  

杨美兰  林钦  黄洪辉  甘居利  蔡文贵  吕晓瑜  王增焕  李纯厚  杜飞雁 《海洋通报》2005,24(4):22-26

2002年5月和8月对珠江口伶仃洋水域水质化学耗氧量（COD）进行了调查研究,结果表明：该水域近期COD含量变幅在0.41～2.72mg/L之间,平均值为1．21mg/L;区域分布呈北部向南部水域逐渐递减以及近岸水域含量大于远岸的变化趋势;夏季COD的含量高于春季：以我国Ⅰ类海水水质COD含量≤2mg／L标准评价,超标率为15％;COD含量与同期（春、夏季）的悬浮物含量呈正相关性,与无机氮和活性磷酸盐含量在夏季呈负相关性。  相似文献