On Mineralize-halo-forming Mechanism of Sareke Glutenite-type Copper Deposit in Xinjiang     

YU Wangjie  FANG Weixuan  Guo Yuqian  Wang Lei  Li Tiancheng  Lu Jia 《《地质学报》英文版》2017,91(Z1):245-246

<正>1 Introduction Sareke glutenite-type copper deposit is located in the Sarekebayi basin,a sub-basin of southwest margin of the Tuoyun Mesozoic hinterland basin in the northwestern part of the Tarim Basin.The Tuoyun Mesozoic hinterland  相似文献   

深圳大鹏半岛中生代火山岩地质地貌特征——以大鹏半岛国家地质公园为例     

梅村  唐跃林  张崧  康镇江  管福贞  龚淑云  李甘 《热带地理》2010,30(4)

以大鹏半岛国家地质公园为调查对象,通过野外重点地质路线观察测制火山地层剖面,结合卫星遥感图像解译,进行锆石同位素激光定年测试及微量元素LA-ICP-MS分析、火山岩石显微镜薄片鉴定、岩石主量元素分析和微量元素ICP-MS分析,结果发现:该区火山活动的分带明显受区域性北东向及北西向断裂构造所控制,公园内中生代火山岩相基本为陆相喷发,岩石基本分为酸性及中酸性两类,多属钙碱性岩,部分为弱碱性岩。新发现七娘山火山穹丘、三角山-大燕顶火山穹丘,雷公打石山峰、鸡公秃等12处火山锥,摇摆石等6个火山柱及鸡公秃火山锥南西侧的火山针,大燕顶古火山口等火山机构。特征火山岩方面,有隐爆火山集块(角砾)岩、崩积火山集块岩、基浪堆积层-"火山-沉积碎屑岩"。公园内古火山地貌景观有一级地貌景观点3处、二级5处、三级7处。认为该区中生代以来,至少经历过3期5次火山喷发活动,反映了库拉-太平洋板块与欧亚大陆板块相互作用的动力过程及我国东南沿海浙闽粤港巨型火山活动带的部分特征,是亚洲大陆边缘大规模火山喷发(岩)带侏罗纪-白垩纪火山岩系较有代表性的地段,是研究我国东南沿海侏罗纪-白垩纪火山活动的天然博物馆。  相似文献   

三维土-结构动力相互作用的一种时域直接分析方法   总被引：1，自引：0，他引：1  

陈少林  唐敢  刘启方  丁海平 《地震工程与工程振动》2010,30(2)

本文提出了一种分析三维土-结构动力相互作用的时域直接方法。该方法采用集中质量显式有限元和透射人工边界模拟无限域地基,通过编制的FORTRAN程序实现;采用ANSYS软件对上部结构进行建模分析,并通过FORTRAN程序对ANSYS软件的调用,实现了土与结构系统在地震作用下的整体分析。该方法为显隐式相结合的方法,地基和上部结构可采用不同的时间步距进行分析,可大大提高效率。通过两算例,验证了该方法的可行性。  相似文献   

国内外生物礁油气勘探现状与我国南海生物礁油气勘探前景   总被引：2，自引：0，他引：2  

甘玉青  肖传桃  张斌 《海相油气地质》2009,14(1)

世界生物礁油气资源非常丰富,随着生物礁油气勘探开发的不断深入,生物礁油气探明储量和产量不断增加,所占比重越来越大。南海是我国最大的边缘海,其特殊的构造背景、多种类型礁的发育和良好的生储盖组合等都决定了南海生物礁油气勘探的广阔前景。建议加快南海勘探开发的步伐,充分利用南海丰富的油气资源。  相似文献   

地质环境容量与评价研究   总被引：5，自引：3，他引：2  

魏子新  周爱国  王寒梅  刘金宝  甘义群 《上海国土资源》2009,(1)

本文系统总结了当今地质环境容量研究存在的主要问题及发展趋势,应用地质环境容量评价指标体系,初步建立了地质环境容量评价理论框架.在此基础上结合上海市主要环境地质问题,分析其主要影响因素,分层次选取合适的评价指标,对上海市地质环境容量进行实证分析.  相似文献   

Spatial and temporal variation of organic carbon in the northern South China Sea revealed by sedimentary records   总被引：2，自引：0，他引：2  

Jianfang Hu  Xuesong Sun  Ping'an Peng  Gan Zhang  Allan R. Chivas 《Quaternary International》2009,206(1-2):46

Three sediment cores were taken from the Pearl River estuary and adjacent northern South China Sea (SCS). These sediment cores span the time interval 1900–2000 AD. The stratigraphy of the concentration, the ratio of total organic carbon (TOC) to total nitrogen (TN) and stable isotope (δ¹³C_org) of organic carbon (OC) from three high-resolution sediment cores were analyzed. The stratigraphic profiles of OC concentration, TOC/TN ratios and δ¹³C_org for the near past 100 yrs indicate that terrestrial organic matter decreases from 68.3% to 27.4% of the TOC in the Pearl River estuary, while Dapeng Bay (offshore east of Hong Kong) apparently had throughout little terrestrial organic matter input. The highest deposited OC occurs at the Humen River mouth and the OC concentrations are higher in the outer estuary than in the inner shelf of the northern SCS. The deposited OC at the River mouth increased with time, which could be caused by the high precipitation of land-derived organic matter and the high input of terrestrial organic matter, which is likely related to the rapid urbanization and industrial development in the Pearl River Delta since the 1970s. The OC concentrations did not exhibit an obvious increase with time in most areas of the Pear River estuary and adjacent inner shelf of the SCS, but the algal-derived OC concentration inferred from the δ¹³C_org values increased with time especially from 1980 to 2000 in the outer Pearl River estuary and Dapeng Bay. This increase is presumably caused by enhanced primary marine productivity supported by higher anthropogenic nutrient inputs.  相似文献   

Possible climate change/variability and human impacts,vulnerability of drought-prone regions,water resources and capacity building for Africa     

T.Y. Gan  Mari Ito  S. Hülsmann  X Qin  X.X. Lu  S.Y. Liong 《水文科学杂志》2013,58(7):1209-1226

ABSTRACT

This review article discusses the climate, water resources and historical droughts of Africa, drought indices, vulnerability, impact of global warming and land use for drought-prone regions in West, southern and the Greater Horn of Africa, which have suffered recurrent severe droughts in the past. Recent studies detected warming and drying trends in Africa since the mid 20th century. Based on the Fourth Assessment Report of the Intergovernmental Panel on Climate Change and the Coupled Model Intercomparison Project Phase 5 (CMIP5), both northern and southern Africa are projected to experience drying, such as decreasing precipitation, runoff and soil moisture in the 21st century and could become more vulnerable to the impact of droughts. The daily maximum temperature is projected to increase by up to 8°C (RCP8.5 of CMIP5), precipitation indices such as total wet day precipitation (PRCPTOT) and heavy precipitation days (R10 mm) could decrease, while warm spell duration (WSDI) and consecutive dry days (CDD) could increase. Uncertainties of the above long-term projections, teleconnections to climate anomalies such as ENSO and the Madden-Julian Oscillation, which could also affect the water resources of Africa, and capacity building in terms of physical infrastructure and non-structural solutions are also discussed. Given that traditional climate and hydrological data observed in Africa are generally limited, satellite data should also be exploited to fill the data gap for Africa in the future.