气象因素对汕头市大气O3污染的影响     

杜勤博  吴晓燕  郑素帆  陈欢欢  郭丹妮 《气象与环境科学》2019,42(4):83-89

利用2014年到2016年汕头市O_3的逐日浓度资料,分析了O_3污染的时间变化特征,并结合汕头市国家基准气象观测站的同期地面气象资料,分析了风、混合层厚度、降水、大气环流等气象因素对O_3污染的影响,同时探讨了影响污染物浓度变化的原因。结果表明:不同于北方多数城市夏季O_3污染严重,汕头市的O_3污染秋季(9—11月)最严重,初夏(6月)污染较小,这与汕头的地理位置和气候条件有关。O_3浓度呈单峰型日变化,午后15:00左右浓度最高,夜间浓度较低。风速对O_3既有扩散作用,又有混合作用,当日均风速为1.7 m/s时O_3的平均浓度最大;O_3日均浓度与14时混合层厚度呈显著正相关,午后混合层厚度对O_3日内峰值有很大影响;O_3平均浓度在相对湿度60%时达到最大,高相对湿度不利于O_3体积分数的积累;降水对O_3的去除效果随着降水量级的增大而增大,汛期降水的去除效果与总体去除效果基本一致,而非汛期强降水(中雨以上)去除效果更加显著;出现轻雾时O_3浓度接近平均,出现霾时O_3浓度较高,出现大雾时不利于O_3的生成;当汕头市地面为冷高压脊、850 hPa为东北风场、500 hPa为副热带高压控制时,有利于光化学反应,易造成O_3污染。  相似文献   

The second half of plate tectonics: finding the last ~200 Ma of subducted lithosphere and incorporating it into plate reconstruction     

John Suppe  Jonny Wu 《《地质学报》英文版》2018,92(Z1):10-10

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The South China Sea oceanic domain at the end of spreading     

Minghui Zhao  Jean Claude Sibuet  Siqing Liu  Xinming Pang  Xuelin Qiu  Jonny Wu  Jinyao Gao 《《地质学报》英文版》2018,92(Z1):90-91

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Elastic properties of orthoenstatite and its high-pressure phase and implications for the origin of low VP/VS zones and the X discontinuity     

Wangsheng Qian  Wengzhong Wang  Fan Zou  Zhongqing Wu 《《地质学报》英文版》2018,92(Z1):133-133

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Characteristics, differences and main controlling factors of source rocks in the central-southern South China Sea Basins     

WANG Yibo  XIE Xiaojun  LAN Lei  GUO Ji  WANG Long  TANG Wu 《《地质学报》英文版》2018,92(Z2):113-114

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Sinian-Cambrian Tectonic Framework in the Tarim Basin and its Influences on the Paleogeography of the Early CambrianEI北大核心CSCD     

Yan W.  Wu G.  Zhang Y.  Yang G.  Lou H.  Wang X. 《大地构造与成矿学》2018,(3):455-466

Due to strong remodification and sparse trace remnants, tectonic restoration is critical for the reconstructing of the paleography and basin-prototype in the multiple-cycles superimposed basin, which is also fundamental for the hydrocarbon exploration of the deep marine carbonate in the Tarim Basin. This study presents the tectonic framework of the transition phase from the Sinian to the Cambrian Period and its constrains on the paleography of the Cambrian in the Tarim Basin based on comprehensive analysis of new geochronology data, seismic data and regional tectonic data. The results showed that (1) there is a large regional unconformity between the Cambrian and Precambrian, suggesting a discontinuous deposition from the Sinian to the Cambrian that is contrary to the major view; (2) a broad flattened paleotopography formed before Cambrian Period, which is favorable for the wide epicontinental sea environment and a gentle homoclinal ramp platform development in the early Cambrian, and the residual basement low relief uplifts that influence the microfacies differentiation in the carbonate platform; (3) the Cambrian carbonate platform has been involved much into the marginal orogenic belts, and the proto-platform is probably of 200 km out of the present basin in S-N direction; (4) there is a weak extensional setting in the Cambrian-Early Ordovician rather than a strong rifting setting with a large aulacogen into the platform, in which a inter-platform shallow depression and stable ramp platform developed in the Cambrian; (5) there is not troughs, but rather low relief uplifts developed in the Early Cambrian in the southwestern Tarim Basin, and lack of large uplifts along the carbonate platform margins; (6) it is showed a broad architecture of platform-wide slope-ocean basin from the inner Tarim plate to its margin in the Cambrian Period. Considering the basin prototype, the restoration of the tectono-paleography in the early Cambrian in the Tarim Basin is distinct from those of the previously proposed. We propose that a gentle pattern with “two platforms and one inter-depression” in E-W striking other than multiple small platform constrained in the basin, and further subdivision of the western platform with inner platform low uplift and sag in N-S striking, which is possibly inherited from the basement architecture. On the outer of the united platform, there is probably broad gentle slope for transition to ocean basin. We therefore argue that tectonic restoration is crucial for reconstruction of the paleogeography and basin prototype, especially for basins experienced multiphase of tectonic cycles. © 2018, Science Press. All right reserved.  相似文献   

Generation and Development of Structures and Their Controls on Ore Mineralization in the Lehong Zinc-lead Deposit,Northeastern YunnanEI北大核心CSCD     

Cui J.  Han R.  Wang J.  Ren T.  Wu Y.  Zhao D. 《大地构造与成矿学》2018,(4):664-680

The Lehong zinc-lead deposit is one of the new-found large Zn-Pb deposits in the Sichuan- Yunnan-Guizhou Zn-Pb poly-metallic mineralization area. The ore-bodies of the Lehong deposit are strictly controlled by structures, and the fault tectonites can be divided into four groups which include morbruk rock, cataclastic rock and tectonic breccia. The mechanical properties of the faults suggest that there are five tectonic systems formed in the Caledonian-early Hercynian, Indosinian-early Yanshanian, mid-Yanshanian, late Yanshanian and Himalayan periods, respectively. The Lehong fault and the Qiaojia-Lianfeng fault are two important ore-controlling structures which might have acted as channel ways of the ore fluids. The ores are hosted in the subordinary fracture zone, joint fracture zone and interlayer fault zones in trailing folds of the Lehong fault and the Baobaoshang syncline and Jinjiagou anticline. Hence, the Lehong deposit is a tectonic -controlled ore deposit. These research do not only lay a foundation for studying deposit genesis and ore-finding direction in the Lehong deposit, but also provides important enlightenments for the ore-finding prognosis of lead-zinc deposits in northwestern Guizhou ore concentration district. © 2018, Science Press. All right reserved.  相似文献   

贵州石阡-花桥断裂构造特征及其对地热资源的控制作用          下载免费PDF全文

张晗彬  邓旭升  王波  唐佐其  陈武 《贵州地质》2018,35(2):131-137

石阡地区具有丰富的地热资源,在石阡-花桥断裂带及其次级构造中形成了一系列的温泉群。断裂构造对地热资源具有严格的控制作用。本文通过对石阡-花桥断裂带显微构造、运动学等构造地质特征和该地区地热特征,系统分析石阡-花桥断裂带构造特征及其对地热资源的控制作用。研究认为,石阡地区地热资源的主要热源为地温梯度增温,地热资源的分布严格受控于石阡-花桥断裂。石阡断裂为逆冲兼左行平移断层,为地热水的传导和储集提供了有利空间。花桥断裂带发育拉张裂隙、扭裂隙及分枝状断层,圈闭了含水岩系,在拉裂破碎带上形成热储。温泉大多沿主要控热、导热断裂出露,平面上呈线状分布于石阡和花桥断裂上盘及花桥断裂的断夹块中。  相似文献   

Effects of a proline solution cover on the geochemical and mineralogical characteristics of high-sulfur coal gangue     

Youfa Luo  Yonggui Wu  Tianling Fu  Hu Wang  Rongrong Xing  Zhilin Zheng 《中国地球化学学报》2018,37(5):701-714

Batch experiments were conducted to comparatively evaluate the inhibition effects and mechanisms of a low-concentration (1%) proline solution cover on the release of pollutants from high-sulfur coal gangue. High-sulfur coal gangue was continuously immersed in a proline solution and in deionized water (as a control treatment) for 540 days. The results showed that the coal gangue in the control treatment was oxidized and generated leachate with poor water qualities, i.e., the leachate exhibited lower pH values, higher redox potential values, higher pollutant concentrations (SO₄^2?, Fe, Mn, Cu, and Zn), and high levels of acidophilic sulfur-oxidizing bacteria. However, compared to the control treatment, the addition of the proline solution (1%) significantly improved the water quality of the leachate by significantly reducing the Eh values, the pollutant concentrations (SO₄^2?, Fe²⁺, Fe, Mn, Cu, and Zn), and the activity of acidophilic sulfur-oxidizing bacteria and by significantly increasing the pH value to neutral. The proline treatment significantly inhibited the oxidation of coal gangue and the release of pollutants, mainly by inhibiting the activity of acidophilic sulfur-oxidizing bacteria and by altering the heavy metal fractions and the mineralogical characteristics. Therefore, in engineering practice, workers should consider using an environmental friendly aqueous proline solution cover to achieve the in-situ control of pollutant releases from coal gangue dumps.  相似文献   

Elemental characteristics and paleoenvironment reconstruction: a case study of the Triassic lacustrine Zhangjiatan oil shale,southern Ordos Basin,China     

Delu Li  Rongxi Li  Zengwu Zhu  Xiaoli Wu  Futian Liu  Bangsheng Zhao  Jinghua Cheng  Baoping Wang 《中国地球化学学报》2018,37(1):134-150

Using trace elements to reconstruct paleoenvironment is a current hot topic in geochemistry. Through analytical tests of oil yield, ash yield, calorific value, total sulfur, major elements, trace elements, and X-ray diffraction, the quality, mineral content, occurrence mode of elements, and paleoenvironment of the Zhangjiatan oil shale of the Triassic Yanchang Formation in the southern Ordos Basin were studied. The analyses revealed relatively high oil yield (average 6.63%) and medium quality. The mineral content in the oil shale was mainly clay minerals, quartz, feldspar, and pyrite; an illite–smectite mixed layer comprised the major proportion of clay minerals. Compared with marine oil shale in China, the Zhangjiatan oil shale had higher contents of quartz, feldspar, and clay minerals, and lower calcite content. Silica was mainly in quartz and Fe was associated with organic matter, which is different from marine oil shale. The form of calcium varied. Cluster analyses indicated that Fe, Cu, U, V, Zn, As, Cs, Cd, Mo, Ga, Pb, Co, Ni, Cr, Sc, P, and Mn are associated with organic matter while Ca, Na, Sr, Ba, Si, Zr, K, Al, B, Mg, and Ti are mostly terrigenous. Sr/Cu, Ba/Al, V/(V + Ni), U/Th, AU, and δU of oil shale samples suggest the paleoclimate was warm and humid, paleoproductivity of the lake was relatively high during deposition of the shale—which mainly occurred in fresh water—and the paleo-redox condition was dominated by reducing conditions. Fe/Ti ratios of the oil shale samples suggest clear hydrothermal influence in the eastern portion of the study area and less conspicuous hydrothermal influence in the western portion.  相似文献