Variations in total organic carbon and acid-volatile sulfide distribution in surface sediments from Luan River Estuary,China     

Deliang Li  Xianbin Liu  Zhanguang Liu  Xinggui Zhao 《Environmental Earth Sciences》2016,75(14):1073

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南华北东部徐淮地区新元古界生烃潜力分析   总被引：1，自引：0，他引：1       下载免费PDF全文

李振生  刘德良  吴小奇  王广利  王铁冠 《地质科学》2012,47(1):154-168

通过地层特征、有机地球化学指标和岩相古地理的分析,研究了南华北东部(徐淮地区)新元古界作为烃源岩及形成原生油气藏的可能性.结果表明:徐淮地区新元古界有机质丰度低,母质类型为Ⅰ型干酪根,热演化程度处于成熟—过成熟阶段;自下而上可划分为青白口系刘老碑组和南华系贾园组—魏集组两套烃源岩,后者又细分为贾园组—九顶山组和张渠组—...  相似文献   

Subduction of the Bangong–Nujiang Ocean: constraints from granites in the Bangong Co area,Tibet     

Deliang Liu  Qishuai Huang  Shuaiquan Fan  Liyun Zhang  Rendeng Shi  Lin Ding 《Geological Journal》2014,49(2):188-206

We report geochronologic, whole‐rock geochemical and Sr–Nd isotopic analyses of the granites that are exposed to both the north and the inside of the Bangong–Nujiang Suture (BNS) zone as well as the implications for the Mesozoic history of Tibet. To the north of the BNS, the Larelaxin pluton consists of I‐type quartz diorite and highly fractionated I‐type biotite granite. The Larelaxin pluton is enriched in large‐ion lithophile elements (LILE) but depleted in high‐field‐strength elements (HFSE); therefore, it exhibits the features of volcanic arc rocks. The initial Sr (0.7102 to 0.7215) and negative εNd (t) (−2.91 to −5.20) values imply a mixture of depleted mantle and continental crust. The mean ²⁰⁶Pb/²³⁸U zircon age is 168 Ma; we therefore propose that the Bangong–Nujiang Ocean (BNO) had already been subducted beneath the Qiangtang terrain by the middle Jurassic. Inside the BNS, the Rutog granites intruded into the Lagongtang and Duoren formations, which show a continental margin and a forearc basin sedimentary facies, respectively. The mean ²⁰⁶Pb/²³⁸U zircon age is 101 Ma. The Rutog granites are monzogranites with a high Na/K ratio (Na₂O/K₂O > 1) and a high LILE/HFSE ratio, and A/CNK < 1.1. The high Sr/Y ratio (22 to 56) implies that these granites are adakitic. The low initial Sr (0.7044 to 0.7055) and positive εNd (t) (+1.46 to +2.70) values indicate that the protolith of the Rutog granites originated mainly from a depleted source. We attribute the Rutog plutonism to the development of an oceanic arc during the continuing northward subduction of the BNO and propose that the Rutog adakitic granites were formed by melting of the subducted BNO crust with limited crustal contamination. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

构造叠加晕找盲矿法及其在矿山深部找矿效果   总被引：7，自引：0，他引：7       下载免费PDF全文

李惠  张国义  禹斌  李德亮 《地学前缘》2010,17(1):287

构造叠加晕找盲矿法是在发展了原生晕找盲矿理论基础上,根据热液矿床成矿成晕严格受构造控制,热液矿床具有多期多阶段叠加成矿成晕特点,提出原生晕叠加理论,解决了困惑化探专家几十年在研究原生晕轴向分带中出现的"反常"现象难题,独创了构造叠加晕找盲矿新方法,并介绍了构造叠加晕方法特点、主要成果、金矿床4种叠加结构的理想模式和盲矿预测的5条准则,应用效果和找矿实例。  相似文献   

卡拉麦里缝合带后碰撞背景与火山岩油气藏关系探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

吴小奇  刘德良  李振生 《地质科学》2010,45(4):1098-1110

北疆地区卡拉麦里洋盆关闭后,两侧陆块处于松散拼贴状态,发育了陆间残余海盆,表明该缝合带是通过软碰撞作用形成的;后碰撞期,沿缝合带发育较大规模的火山活动。近年来的油气勘探表明,这些后碰撞火山岩中赋存了丰富的油气资源。本文对卡拉麦里缝合带多个火山岩油气藏的主要控制因素进行了分析,结果表明,卡拉麦里缝合带后碰撞期幔源岩浆底垫和火山活动有利地促进了该区烃源岩中有机质的热演化;后碰撞期的构造演化与石炭系烃源岩的分布、火山岩储集空间的形成和演化、油气盖层的发育等紧密相关,同时还通过断裂、不整合和反转构造等控制了油气的运移和保存,这些都为形成火山岩油气藏创造了有利条件。卡拉麦里缝合带火山岩油气藏具有良好的勘探前景,其中陆东—五彩湾地区火山岩油气藏主要位于石炭系顶面的风化壳内,滴南凸起中西部是最有利的地段,五彩湾凹陷残余构造高点也较为有利。  相似文献   

中国天气发生器非降水变量模拟参数分布特征   总被引：1，自引：0，他引：1  

廖要明  陈德亮  谢云 《气象学报》2013,71(6):1103-1114

对基于马尔可夫链的理查森型中国天气发生器降水模拟已经有过比较系统的研究,但对非降水变量的模拟及其参数的分布特征等的研究还有待进一步深入。文中根据中国669个站点1971—2000年的逐日降水、最高气温、最低气温和日照时数资料,分干、湿两种状态计算了中国天气发生器各非降水变量的模拟参数——干、湿日条件下平均值和标准差的傅立叶系数以及各变量残差序列之间当天和后延一天的自相关、互相关系数,并分析了这些模拟参数在中国的空间分布规律,为中国天气发生器的进一步推广应用以及模拟参数的空间插值提供了技术支撑。  相似文献   

Erratum to: Could the Recent Taal Volcano Eruption Trigger an El Ni?o and Lead to Eurasian Warming?     

Fei LIU  Chen XING  Jinbao LI  Bin WANG  Jing CHAI  Chaochao GAO  Gang HUANG  Jian LIU  Deliang CHEN 《大气科学进展》2020,37(11):1295-1295

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构造地球化学的回顾与展望   总被引：3，自引：0，他引：3  

吕古贤  孙岩  刘德良  吴学益  刘瑞珣 《大地构造与成矿学》2011,35(4):479-494

较早的构造地球化学研究思想是“经受着变形的岩石可以发生化学变化”( Sorby,1863).经过长期、广泛和深入研究,相继提出了应力矿物、构造变质、构造动力成岩成矿、改造成矿、构造相和构造地球化学等概念和认识,揭示了构造作用在控制岩石形成和变形过程中还影响其中地球化学元素的分布、分异和成矿等,推动了大地构造、区域地质、...  相似文献   

Diurnal Variations of Summer Precipitation in the Beijing Area and the Possible Effect of Topography and Urbanization   总被引：3，自引：0，他引：3  

YIN Shuiqing  LI Weijing  Deliang CHEN  Jee-Hoon JEONG  GUO Wenli 《大气科学进展》2011,28(4):725-734

The present study examined the diurnal variations of summer precipitation in the Beijing area by using subdaily precipitation and wind observations. A combined effect of topography and urbanization on the characteristics of diurnal variations was suggested. It was shown that stations located in the plain areaexhibited typical night rain peaks, whereas those in the mountainous area exhibited clear afternoon peaks ofprecipitation diurnal variations. The precipitation peaks were associated with wind fields around the Beijing area, which were found to be highly modulated by mountain-valley circulation and urban-country circulation.The lower-tropospheric wind exhibited a clear diurnal shift in its direction from north at 0800 LST to southat 2000 LST, which reflected mountain-valley circulation. The transitions from valley to mountain windand the opposite generally happened after sunset and sunrise, respectively, and both occurred earlier for thestations located closer to mountains. By comparing the diurnal variations of precipitation at stations in anortheast suburb, an urban area, and a southwest suburb, it was revealed that the northeast suburb grouphad the highest normalized rainfall frequency, but the southwest group had the lowest from late afternoon tolate evening. On the contrary, in the early morning from about 0200 to 1000 LST, the southwest group andurban group had the highest normalized rainfall frequency. This pattern might originate from the combined effects of mountain-valley topography and urbanization.  相似文献   

The Influence of Large-Scale Circulation on the Summer Hydrological Cycle in the Haihe River Basin of China          下载免费PDF全文

OU Tinghai  LIU Yanxiang  CHEN Deliang  David RAYNER  ZHANG Qiang  GAO Ge  XIANG Weiguo 《Acta Meteorologica Sinica》2011,25(4):517-526

In this study, we focus on changes in three important components of the hydrological-cycle in the Haihe River basin (HRB) during 1957-2005: precipitation (Prep), actual evaportranspiration (ETa), and pan evaporation (PE)-a measure of potential evaporation. The changes in these components have been evaluated in relation to changes in the East Asian summer monsoon. Summer Prep for the whole basin has decreased significantly during 1957-2005. Recent weakening of the convergence of the integrated water vapor flux, in combination with a change from cyclonic-like large-scale circulation conditions to anti-cyclonic-like conditions, led to the decrease in the summer Prep in the HRB. ETa is positively correlated with Prep on the interannual timescale. On longer timescales, however, ETa is less dependent on Prep or the large-scale circulation. We found negative trends in ETa when the ERA40 reanalysis data were used, but positive trends in ETa when the NCEP/NCAR reanalysis data were used. PE declined during the period 1957-2001. The declining of PE could be explained by a combination of declining solar radiation and declining surface wind. However, the declining solar radiation may itself be related to the weakening winds, due to weaker dispersion of pollution. If so, the downward trend of PE may be mainly caused by weakening winds.  相似文献