冀中平原深部地下热水资源可更新特征与依据——以辛集馆陶组地下热水系统为例     

张光辉  李卓  严明疆  王茜  王威 《地球学报》2016,37(5):637-644

针对冀中平原深部地下热水资源可更新性问题,以辛集馆陶组地下热水系统为例,采用相同开采强度下地下热水位降幅异常变化的识别方法,通过2000年以来该地下热水位年际及月际降幅与开采量和上游山区年降水量之间响应变化特征研究,结果表明:(1)冀中平原辛集地区馆陶组地下热水资源具有一定的可更新能力,与上游山区年降水量变化相关,还与地下水位埋深、当年开采引起的水位降幅大小和开采疏干层位砾粗砂岩及细砂岩占比状况有关;(2)辛集地区馆陶组地下热水大规模开采,是该地下水系统获得上游区侧向流入补给的必要条件,属于开采激发型补给,更新补给的资源数量有限;(3)从2000年以来该区地下热水水位动态变化趋势来看,目前该区地下热水资源已处于超采状态,需要压采或人工回灌增大补给,否则难以可持续开发利用。  相似文献   

藏南特提斯喜马拉雅带内江孜-康马地区白垩纪多期基性岩浆作用   总被引：3，自引：3，他引：0  

王亚莹  高利娥  曾令森  陈福坤  侯可军  王倩  赵令浩  高家昊 《岩石学报》2016,32(12):3572-3596

在特提斯喜马拉雅带东部江孜-康马一带发育大量近东西向展布的辉绿岩体/墙,研究表明这些基性岩至少可分为三期:(1)形成于~140Ma的辉绿岩具有OIB型地球化学特征,部分样品Sr-Nd同位素组成与其东部~132Ma错美-班布里大火成岩省中基性岩相当,部分高镁样品具有Nb-Ta负异常和Pb正异常,εNd(t)值小于0;(2)形成于~120Ma的辉绿岩显示N-MORB型地球化学特征;(3)形成于~90Ma的辉绿岩显示E-MORB型地球化学特征。后两期基性岩的Sr-Nd同位素组成均显示与印度洋MORB相关。结合同时期的Kerguelen地幔柱活动轨迹及东冈瓦纳大陆裂解事件,本文认为江孜-康马地区~140Ma基性岩代表Kerguelen地幔柱及其与上覆东冈瓦纳大陆岩石圈地幔相互作用产物,是Kerguelen地幔柱长期潜伏于东冈瓦纳大陆下的证据,在前人研究基础上将该地幔柱影响的范围从错美向西拓展了约200km;之后随着东冈瓦纳大陆裂解和印度洋的开启及扩张,印度板块逐渐北移并远离Kerguelen地幔柱,江孜-康马地区~120Ma和~90Ma两期基性岩代表新生印度洋软流圈部分熔融的产物,与Kerguelen地幔柱无关。该区识别出的三期基性岩浆活动表明:特提斯喜马拉雅带的东部在白垩纪经历了与东冈瓦纳大陆裂解、印度洋的开启和扩张相关的多期基性岩浆活动。这些基性岩为深入了解和限定特提斯喜马拉雅带自140Ma以来的古地理位置和构造演化过程提供了新的岩石记录和时间坐标。  相似文献   

大直径加重管绳索取心技术在页岩气勘探中的应用研究          下载免费PDF全文

朱恒银  王强  张正  蔡正水 《探矿工程》2016,43(10):160-164

根据页岩气、煤层气勘探对钻探技术的特殊要求,进行了大直径绳索取心技术的探索研究。文中重点介绍了加重管组合式绳索取心钻具的结构、作用原理及特点,以及施工试验效果。通过施工实践的启示,对大直径绳索取心技术的发展提出了几点认识。  相似文献   

北祁连地区中寒武世岩相古地理研究          下载免费PDF全文

谭志远  牟传龙  王启宇  陈小炜  葛祥英  侯乾 《沉积与特提斯地质》2016,36(1):55-61

现今地处造山带的北祁连地区在中寒武世时期拉张的构造背景下海域进一步拓宽。通过对北祁连地区中寒武统地层野外调查及室内分析研究,在"构造控盆、盆控相"的思路控制下,以沉积岩性、结构-构造、古生物组合等为基础,在优势相原则的指导下,共划分出浅海陆棚相、半深海相、深海盆地相3种沉积相类型。结合前人的研究资料,编制北祁连地区中寒武世的沉积构造格架及沉积盆地类型图,分析其空间配置关系。在此基础上,采用造山带岩相古地理编图方法,恢复与重建研究区的古地理面貌,编制相应的古地理图。  相似文献   

西北太平洋海洋净初级生产力与柔鱼资源量变动关系的研究   总被引：10，自引：3，他引：7  

余为  陈新军  易倩 《海洋学报》2016,38(2):64-72

海洋初级生产力在海洋生态中扮演重要角色,其变化影响了海洋渔业的潜在产量。本文根据2004-2013年中国鱿钓组提供的西北太平洋柔鱼(Ommastrephes bartramii)捕捞数据和海洋遥感净初级生产力数据,研究了柔鱼冬春生西部群体资源量变动与净初级生产力的关系。结果发现,柔鱼渔场范围内净初级生产力在经度方向上呈明显的季节性变化,冬春季低,夏秋季高。捕捞月份7-11月对应的适宜净初级生产力范围分别为500~700 mg/(m2·d)(以碳计),500~800 mg/(m2·d),500~1000 mg/(m2·d),500~800 mg/(m2·d)和300~500 mg/(m2·d),最适净初级生产力分别为700 mg/(m2·d),600 mg/(m2·d),700 mg/(m2·d),600 mg/(m2·d)和400 mg/(m2·d)。7-11各月最适净初级生产力平均纬度与捕捞努力量纬度重心呈显著正相关关系(P<0.05),说明了捕捞努力量位置在渔场中不是随机分布,可能受最适净初级生产力的纬度分布的影响。柔鱼年间资源丰度与各年3月份净初级生产力以及7-11月份平均净初级生产力大小显著正相关(P<0.05)。推测每年柔鱼资源量大小可能是由3月份产卵场海域和7-11月捕捞月份渔场净初级生产力水平交互作用的结果。研究表明,异常环境条件(厄尔尼诺和拉尼娜事件)对柔鱼产卵场和渔场的净初级生产力具有显著影响,但调控机制不同。  相似文献   

基于长期观测的辽东湾口东部海域水动力特征研究   总被引：1，自引：0，他引：1  

赵骞  王梦佳  丁德文  陈伟斌 《海洋学报》2016,38(1):20-30

辽东湾口东部海域是辽东湾与渤海中部进行物质和能量交换的主要通道之一。本文利用坐底式海床基平台获取的近8个月的水动力连续观测资料,通过谱分析和调和分析方法对该海域的潮汐、潮流特征进行分析,并讨论了余流及底层温度的季节变化规律。研究结果表明:该海域潮汐属于不规则半日潮,平均潮差为0.95 m,最大可能潮差为2.27 m。潮流属于不规则半日潮流,M₂分潮流为其优势分潮流。主要分潮流运动形式为往复流,最大流速方向为西南-东北向。余流的季节性特征较为明显:秋季,余流流速在中层达到最大,流向以西南向为主;冬季,余流流速垂向变化较小,并呈西南偏西向流动;春季,流速随深度增加而减小,流向从表层至底层呈现逆时针旋转的特征。受底层潮流、水平温度梯度及海面温度日变化的影响,底层温度表现出短期的高频变化特征:秋季,短期振荡以半日周期信号为主;冬季,全日周期信号较为显著;春季,短期振荡的现象较弱。  相似文献   

西北太平洋气候和海洋环境变化对柔鱼空间分布的影响     

余为  陈新军  易倩  高郭平  陈勇 《海洋学报(英文版)》2016,35(3):108-116

Ommastrephes bartramii is an ecologically dependent species and has great commercial values among the AsiaPacific countries. This squid widely inhabits the North Pacific, one of the most dynamic marine environments in the world, subjecting to multi-scale climatic events such as the Pacific Decadal Oscillation(PDO). Commercial fishery data from the Chinese squid-jigging fleets during 1995–2011 are used to evaluate the influences of climatic and oceanic environmental variations on the spatial distribution of O. bartramii. Significant interannual and seasonal variability are observed in the longitudinal and latitudinal gravity centers(LONG and LATG) of fishing ground of O. bartramii. The LATG mainly occurred in the waters with the suitable ranges of environmental variables estimated by the generalized additive model. The apparent north-south spatial shift in the annual LATG appeares to be associated with the PDO phenomenon and is closely related to the sea surface temperature(SST)and sea surface height(SSH) on the fishing ground, whereas the mixed layer depth(MLD) might contribute limited impacts to the distribution pattern of O. bartramii. The warm PDO regimes tend to yield cold SST and low SSH, resulting in a southward shift of LATG, while the cold PDO phases provid warm SST and elevated SSH,resulting in a northward shift of LATG. A regression model is developed to help understand and predict the fishing ground distributions of O. bartramii and improve the fishery management.  相似文献   

Early Mesozoic Southward Subduction of the Eastern Mongol–Okhotsk Oceanic Plate: Evidence from Zircon U–Pb–Hf Isotopes and Whole‐rock Geochemistry of Triassic Granitic Rocks in the Mohe Area,NE China          下载免费PDF全文

Liang Li  Fengyue Sun  Bile Li  Qinglin Xu  Yajing Zhang  Ye Qian 《Resource Geology》2016,66(4):386-403

In this paper, we present new U–Pb zircon ages, Hf isotope data and major and trace elements for Early Mesozoic granitic rocks in Mohe area in the Erguna Massif of northeast China to elucidate the southward subduction of the eastern Mongol–Okhotsk Oceanic plate in Early Mesozoic. Zircons from two representative intrusions, syenogranites and monzogranites, in the Mohe area are euhedral–subhedral in shape, display oscillatory growth zoning in cathodoluminescence (CL) images, and have Th/U ratios of 0.10–0.72, and in combination these features indicating that the zircons are of igneous origin. U–Pb zircon dating results demonstrate that the syenogranites formed at 245.1 ± 1.4 Ma and monzogranites formed at 212.2 ± 1.7 Ma. These granitic rocks are characterized by high SiO₂, Al₂O₃ and (Na₂O + K₂O), low TFeO, MgO, TiO₂ and P₂O₅ concentrations, belonging to the high‐K calc‐alkaline series. They are enriched in LREE and large ion lithophile elements (e.g., Rb, K, and Sr), depleted in HREE and high field strength elements (e.g., Nb, Ta, Th, and Ti), as well as very weak negative Eu anomalies (Eu/Eu* = 0.48 ~ 1.01). Their zircon εHf(t) values range from −7.9 to −2.0 and range from 0.20 to 0.49, in response to their two‐stage Hf model ages (T_DM2) range from 1.40 Ga to 1.77 Ga range from 0.94 Ga to 1.24 Ga, respectively, indicating that primary magmas of syenogranites were derived from partial melting of newly accreted juvenile crustal material that formed from the enriched mantle during the Mesoproterozoic, monzogranites are generated by partial melting of newly accreted juvenile crustal material that formed from the depleted mantle during the Meso‐ to Neoproterozoic. We conclude, therefore, that the early Mesozoic granitic rocks of the Mohe area are associated with the continuous southward subduction of the Mongol–Okhotsk oceanic plate rather than the Paleo‐Asian and circum‐Pacific tectonic regimes.  相似文献   

Size distributions and source function of sea spray aerosol over the South China Sea     

CHU Yingjia  SHENG Lifang  LIU Qian  ZHAO Dongliang  JIA Nan  KONG Yawen 《中国海洋大学学报(英文版)》2016,15(4):569-576

The number concentrations in the radius range of 0.06 – 5 μm of aerosol particles and meteorological parameters were measured on board during a cruise in the South China Sea from August 25 to October 12, 2012. Effective fluxes in the reference height of 10 m were estimated by steady state dry deposition method based on the observed data, and the influences of different air masses on flux were discussed in this paper. The number size distribution was characterized by a bimodal mode, with the average total number concentration of(1.50 ± 0.76)×10~3 cm~(-3). The two mode radii were 0.099 μm and 0.886 μm, both of which were within the scope of accumulation mode. A typical daily average size distribution was compared with that measured in the Bay of Bengal. In the whole radius range, the number concentrations were in agreement with each other; the modes were more distinct in this study than that abtained in the Bay of Bengal. The size distribution of the fluxes was fitted with the sum of log-normal and power-law distribution. The impact of different air masses was mainly on flux magnitude, rather than the shape of spectral distribution. A semiempirical source function that is applicable in the radius range of 0.06 μmr_(80)0.3 μm with the wind speed varying from 1.00 m s~(-1) to 10.00 m s~(-1) was derived.  相似文献   

Growth performance of larval and juvenile manila clam (<Emphasis Type="Italic">Ruditapes philippinarum</Emphasis>) from divergently selected individuals of a full-sib family     

Zhongming Huo  Xiaotong Li  Qian Sun  Yongren Li  Xuekai Zhang  Xiwu Yan  Feng Yang 《中国海洋大学学报(英文版)》2016,15(6):1046-1050

In this study, the method of divergent selection was employed to test the larval and juvenile growth performance within a full-sib family of Manila clam Ruditapes philippinarum. The 10% largest and 10% smallest clam individuals (on the basis of shell length) of a full-sib family were selected as parents for the fast and slow growing lines, respectively. The difference in shell length was significant among the three lines (fast, control, and slow) tested. The sequence of shell length were fast line > control line > slow line. The responses to selection, realized heritability, and genetic gain were 0.06%–0.81%, 0.04%–0.47% and 0.58%–18.89% in the fast direction, respectively; and were 0.14%–1.27%, 0.08%–0.73%, and 0.31%–49.03% in the slow direction, respectively. The results suggested that there was a large portion of additive genetic variance affecting the growth in the full-sib family. Selection in the fast direction within the full-sib family would greatly improve the growth of R. philippinarum.  相似文献