Carbon and nitrogen cycling in the Zhubi coral reef lagoon of the South China Sea as revealed by 210Po and 210Pb     

Yang WF  Huang YP  Chen M  Qiu YS  Li HB  Zhang L 《Marine pollution bulletin》2011,62(5):905-911

The radionuclides (210)Po and (210)Pb were examined to trace the cycling of particulate organic carbon (POC) and particulate organic nitrogen (PON) in the Zhubi coral reef lagoon. The net export flux of POC to the open sea is 14 mg Cm(-2) d(-1). However, the net exchange of PON has not yet been observed. On average, the vertical export fluxes in the lagoon of POC and PON, as derived from (210)Po/(210)Pb disequilibria, are 43 mg Cm(-2) d(-1) and 13.8 mg Nm(-2) d(-1), respectively. The deficit of (210)Po relative to (210)Pb in particulate matter provides evidence for the degradation of particulate organic matter. According to the mass balance budgets, 310 mg Cm(-2) d(-1) and 121 mg Nm(-2) d(-1) were recycled into dissolved fractions. Based on a first-order kinetics model, the degradation rate constants of POC and PON are 0.28 and 0.30 m(-1), respectively. Thus, (210)Po and (210)Pb can quantify the cycling of carbon and nitrogen in this coral lagoon.  相似文献   

白云鄂博矿床基底岩石的年代学研究及其地质意义   总被引：9，自引：0，他引：9  

刘健  李印  凌明星  孙卫东 《地球化学》2011,40(3):209-222

白云鄂博裂谷带发育于古老基底之上,并在裂谷带中形成了白云鄂博超大型REE-Nb-Fe矿床.但是由于古老基底在白云鄂博矿区出露较少,研究工作开展不多.本研究对象是华北克拉通北缘白云鄂博地区宽沟断裂东段被第四纪沉积层覆盖的冲沟中的基底片麻岩.主元素特征是,SiO2含量介于47.07％～79.10％之间,低钛,低钙,Al2O...  相似文献   

桂西地区上二叠统硅质岩地球化学特征及对本区烃源岩发育潜力的指示意义   总被引：1，自引：0，他引：1       下载免费PDF全文

邱振  王清晨 《地质科学》2011,46(1):52-67

通过对桂西地区南丹龙王坡11件上二叠统硅质岩样品和平果四塘6件上二叠统硅质岩样品的主量和微量元素分析研究,并结合已发表的崇左东攀部面大隆组的硅质岩地球化学数据,认为桂西地区上二叠统硅质岩为生物成因,形成于受陆源碎屑影响的大陆边缘沉积环境,其沉积水体为氧化条件.研究区内硅质岩的TOC为0.10%～0.19%,平均为0.1...  相似文献   

鄂西地区茅口组重力流沉积特征及古地理意义   总被引：1，自引：0，他引：1  

万秋  李双应  王松  孔为伦 《沉积学报》2011,29(4):704-711

通过对鄂西地区中二叠统详细的野外剖面测量及沉积微相分析,发现鄂西地区中二叠统茅口组发育重力流沉积,沉积类型多样,发育于碳酸盐岩斜坡沉积环境中,自上而下分为滑塌沉积、碎屑流沉积、颗粒流沉积。滑塌沉积主要发育于湖南慈利江垭剖面,颗粒流与碎屑流发育于湖北长阳资丘剖面。滑塌沉积物主要由杂乱堆积的棱角状—次棱角状砾屑灰岩组成,分...  相似文献   

赣南富城花岗岩中显微-超显微晶质铀矿的厘定及成因   总被引：2，自引：0，他引：2  

章邦桐  吴俊奇  凌洪飞  陈培荣 《矿物学报》2011,31(2):166-172

通过显微镜下观察和电子探针成分分析,厘定了存在于赣南富城强过铝质产铀花岗岩黑云母、白云母、长石中的显微晶质铀矿。根据其成分及矿物组合特征并结合U-Pb同位素年龄测定判明其属原生成因。此外,采用核诱发裂变径迹法,根据白云母探测器上存在的星点状裂变径迹中心,判断造岩矿物(长石、石英)中可能存在超显微级的晶质铀矿核晶。花岗岩中原生晶质铀矿的存在一方面印证了U在Si-O聚合程度增高的花岗岩浆中易与O2-结合形成铀-氧配位多面体的化学键能理论,另一方面也成为花岗岩具有较高产铀能力的地球化学标志之一。  相似文献   

矿物法组合处理垃圾填埋场渗滤液的研究     

凌辉  鲁安怀  王长秋  周建工  王健 《矿物学报》2011,31(1):95-101

垃圾填埋场渗滤液水质复杂,危害性大,对其无害化处理尚未得到很好解决。研究发现,垃圾渗滤液中有机污染物可标识划分为亲水性和疏水性两大类物质。实验针对性采用亲水的天然膨润土处理亲水性有机物,疏水的有机膨润土处理疏水性有机物,再结合鸟粪石结晶法去除氨氮,从而获得一套处理中晚期垃圾渗滤液的经济高效的矿物法组合处理技术。采用GC-MS技术鉴定经矿物法处理后的垃圾渗滤液,亲水性和疏水性有机污染物的种类和含量都明显降低。检测进水与出水的COD、氨氮及重金属浓度这三项关键指标,垃圾渗滤液原液COD为2566 mg/L,氨氮3859 mg/L,重金属Hg为0.305 mg/L。矿物法组合处理后出水的COD为245mg/L,氨氮48 mg/L,重金属Hg未检出。矿物组合法为垃圾渗滤液的无害化处理提供了一条新的思路。  相似文献   

基于EPT2009平台大比例尺数字正射影像的生产新技术     

邱春晓 《福建地质》2011,30(1):62-66

通过对EPT2009软件平台大比例尺数字正射影像图制作的分析,探讨大比例尺数字正射影像的生产新技术、新方法,提出一套DOM产品加工新工艺流程,以龙岩测区航测工程为例加以说明。  相似文献   

北武夷篁碧矿区逆冲推覆构造及其与钼、铅-锌成矿作用关系   总被引：4，自引：0，他引：4       下载免费PDF全文

邱骏挺  余心起  吴淦国  屈文俊  狄永军  张达  罗平  杜安道 《地学前缘》2011,18(5):243-255

北武夷篁碧矿区出露走向北北东、倾向北西西的逆冲推覆构造。野外观察表明,推覆构造在形成过程中一方面错断了先期形成的辉钼矿（体）,另一方面其派生的北西西向张裂隙又控制了晚期铅锌矿体的分布。结合辉钼矿Re-Os同位素年龄（154Ma）、赋矿火山岩的SHRIMP锆石U-Pb年龄（138Ma,131Ma）和主要推覆构造断裂带中钾...  相似文献   

Ecosystem-based marine spatial management: Review of concepts, policies, tools, and critical issues   总被引：1，自引：0，他引：1  

Stelios Katsanevakis  Vanessa Stelzenmüller  Andy South  Thomas Kirk Sørensen  Peter J.S. Jones  Sandy Kerr  Fabio Badalamenti  Christos Anagnostou  Patricia Breen  Guillem Chust  Giovanni D’Anna  Mike Duijn  Tatiana Filatova  Fabio Fiorentino  Helena Hulsman  Kate Johnson  Aristomenis P. Karageorgis  Ingrid Kröncke  Simone Mirto  Carlo Pipitone  Susan Portelli  Wanfei Qiu  Henning Reiss  Dimitris Sakellariou  Maria Salomidi  Luc van Hoof  Vassiliki Vassilopoulou  Tomás Vega Fernández  Sandra Vöge  Anke Weber  Argyro Zenetos  Remment ter Hofstede 《Ocean & Coastal Management》2011,54(11):807-820

Conventional sectoral management and piecemeal governance are considered less and less appropriate in pursuit of sustainable development. Ecosystem based marine spatial management (EB-MSM) is an approach that recognizes the full array of interactions within an ecosystem, including human uses, rather than considering single issues, species, or ecosystem services in isolation. Marine spatial planning and ocean zoning are emerging concepts that can support EB-MSM. EB-MSM is driven by high-level goals that managers aim to achieve through the implementation of measures. High-level goals and objectives need to be translated into more operational objectives before specific targets, limits and measures can be elaborated.Monitoring, evaluation and adaptation are necessary to ensure that marine management measures are both effective and efficient. Solid monitoring frameworks are the foundation of adaptive management, as they provide the necessary information to evaluate performance and the effectiveness of management actions. Marine protected areas (MPAs) - possibly set up in networks - constitute a key component in EB-MSM policies and practises and have been applied as a cornerstone in conservation of marine biodiversity, management of fish populations, development of coastal tourism, etc. Moreover, MPA experiences have provided methods and concepts (such as zoning) to a wider EB-MSM context. The assignment of values to biophysical features of the marine environment allows the direct assessment of related management choices and may assist EB-MSM.A range of monetary valuation techniques have been proposed to reduce attributes of goods and services to a single metric. However, in the marine environment such an approach is often over simplistic, and thus less reductive techniques may be necessary. Rather than producing a single metric, the results of non-monetary assessments guide policy allowing weight to be given as necessary to potential areas of conflict and consensus.Strategies to take into account climate change effects and geohazard risks in EB-MSM have been applied or proposed worldwide. EB-MSM regimes must be alert to such risks and flexible to account for changes.  相似文献   

基于街道空间数据及GPS测量的SRTM-DEM校正和插值细化     

肖飞  Parrot J.F.  杜耘  凌峰 《地球信息科学学报》2011,13(1):118-125

针对城市地区SRTM数字高程模型,本文引入街道空间分布信息作为辅助数据,并结合GPS实地测量,对DEM中具有空间相关性的误差部分进行修正,从而尝试在一定程度上提高SRTM数据的垂直精度和空间分辨率.本文以墨西哥城Xico地区为例,解析SRTM DEM像元分辨率单元内地物表面平均高程值的组成结构;分析形成DEM高程值的地...  相似文献