Plant growth and the performance of mangrove wetland microcosms for mariculture effluent depuration

This study established wetland microcosms that were either unplanted or planted in monoculture with native mangrove species in Taiwan (Avicennia marina, Rhizophora stylosa, and Lumnitzera racemosa) for the purpose of receiving high-salinity mariculture effluents; additionally, the microcosms operated at different hydraulic retention times (HRTs). Plant growth and the performance of the microcosms with respect to pollutant removal were investigated. The results showed that seedlings of all three mangrove species survived and grew sufficiently well under continuous flooding. The presence of mangroves consistently improved SS, BOD₅, and TP removal, particularly under short HRT conditions. The mangrove microcosms removed pollutants from the mariculture effluents with efficiencies of 5.7-27.1% (SS), 4.9-36.3% (BOD₅), 18.7-29.9% (TP), 21.2-49.8% (NH₄-N), and 5.4-37.7% (NO_x-N). A. marina and L. racemosa were more tolerant of continuous flooding than R. stylosa. However, no species displayed consistently superior performance in decreasing all pollutant-related parameters investigated. For all pollutants, microcosms operating at a 2-d HRT exhibited a higher removal efficiency than those operating at a 0.5-d HRT.     

广西里松花岗岩中闪长质包体的分形分布

根据产状、岩石结构与岩石化学等特征，确定里松花岗岩中闪长质包体为异源岩浆岩成因。在此基础上，选择岩体中心、边缘部位的L节理面，统计了它们的密度与粒度等宏观分布特征。结果表明，闪长质包体的产出频率与相对面积分布具有分形特征，即花岗岩一包体体系属于二元流体之间的非线性混合，从而为里松花岗岩的岩浆混合成因提供了新的宏观证据。     

广西里松花岗岩中闪长质包体的分形分布

根据产状、岩石结构与岩石化学等特征,确定里松花岗岩中闪长质包体为异源岩浆岩成因。在此基础上,选择岩体中心、边缘部位的L节理面,统计了它们的密度与粒度等宏观分布特征。结果表明,闪长质包体的产出频率与相对面积分布具有分形特征,即花岗岩-包体体系属于二元流体之间的非线性混合,从而为里松花岗岩的岩浆混合成因提供了新的宏观证据。     

湘南骑田岭花岗岩锆石U-Pb年龄格架

骑田岭花岗岩体位于南岭中段,总出露面积约520 km2,是一个多期次侵入的复式岩体,被它侵入的最新地层为早三叠世大冶灰岩,在岩体南侧不远处的早白垩世红层中,含岩性与骑田岭主侵入体岩性相近的花岗岩砾石及花岗质碎屑岩夹层,据此可以认定,骑田岭主侵人体的侵位时代为早三叠世与早白垩世之间.广东省地质局南岭区测队(1959)在<南岭侵入岩>中,最早研究了骑田岭花岗岩体,指出它侵位于晚侏罗世之后和早白垩世之前.     

张家口水泉沟正长岩杂岩体成因的REE和Sr、Nd、Pb同位素证据

水泉沟杂岩体位于尚义 赤城断裂的南侧,侵位于太古宙桑干群变质岩中。岩体形成于晚加里东至早海两期。其稀土元素含量为8.543×10~(-6)～211.6×10~(-6),随着岩石的CaO、MgO、FeO、Fe_2O_3含量降低,SiO_2、K_2O、Na_2O含量增大,稀土含量减小,稀土分布模式由右倾直线型变为近平直的“～”型。在铅同位素构造模式图上杂岩体落在地幔铅同位素演化线附近。在ε_(Nd)-ε-(Sr)图解上处于地幔演化线的下方。杂岩体的钕模式年龄低于围岩桑干群的形成年龄。岩体可能来源干上地幔与下地壳太古宙变质杂岩混熔作用所形成的正长岩岩浆。     

桂东北牛庙闪长岩和同安石英二长岩:岩石学、锆石SHRIMP U-Pb年代学和地球化学

桂东北牛庙和同安岩体分别由闪长岩和石英二长岩组成。锆石的SHRIMP U-Pb年龄分别为163±4Ma和160± 4Ma。岩石以富铝、富碱、高钾、富含Rb、Ba、Th、U、Pb、Sr等大离子半径亲石元素(LILE)及富含REE、Nb、Ta、Zr、Hf等高场强元素(HFSE)为主要特征,属富钾系列或钾玄岩系列。其不相容元素的分布特征为亲OIB型,主要来源于富集的岩石圈地幔的熔融。两岩体的常量元素、微量元素和Sr-Nd同位素组成特征,反映了它们的原始岩浆经历过相当充分的分离结晶和相当程度的地壳混染,即通过AFC方式而形成。岩体中广泛分布的微细粒状暗色包体是共存的更偏基性的岩浆与寄主岩浆不完全混合的残留,其成分的多样性和相互过渡关系,反映了不同包体母岩浆在形成和演化途径等方面的差异性。岩体形成于燕山早期华南后造山阶段大陆地壳拉张减薄的构造环境,软流圈地幔沿超岩石圈深断裂的上涌和底侵,是造成富集的岩石圈地幔和中下地壳熔融并形成本区闪长质和花岗质岩浆的主要机制。     

Occurrence and phase distribution of polycyclic aromatic hydrocarbons in riverine runoff of the Pearl River Delta, China

The occurrence and phase distribution of polycyclic aromatic hydrocarbons (PAHs) in waters at the eight riverine outlets of the Pearl River Delta (China) were examined based on a monthly sampling program from March 2005 to February 2006. The total concentrations of PAHs in the aqueous phase and suspended particulate matter (SPM) combined ranged from 55.5 to 522 ng/L, at the mid level of the global values in rivers and estuaries. No clear temporal and spatial trends of PAH concentrations were found. However, the concentrations of PAHs associated with SPM coincided with the monthly precipitation of Guangzhou, indicating the importance of atmospheric deposition. The PAHs found in the region were likely derived from a combined pyrolytic and petrogenic origin, as suggested by the molecular indices of PAHs. Normalized partition coefficient (K(oc)) between water and SPM was correlated with octanol-water partition coefficient (K(ow)) to understand the environmental behavior of PAHs.     

H_2Pb_2Fe_4[(Te,S)O_4]_9·9H_2O:东坪金矿的未定名碲酸盐矿物

东坪金矿是产于正长杂岩内接触带的特大型金矿床 ,矿石以富碲、少硫化物为特点[1] 。主要载金矿物为自然金和金、银碲化物。后者包裹于黄铁矿为主的硫化物内 ,属于氰化法的“难溶金”[2 ] ,在表生条件下的氧化产物种类丰富的含金碲酸盐相中含量与自然金相当[3 ,4 ] 。作者用扫描电镜研究东坪金矿 1 70号矿体中含硫化物石英脉矿石时 ,发现与Ｅｚｔｌｉｔｅ[5] 具相似化学成分的铅、铁碲酸盐相 ,指示从碲化物、硫化物氧化形成的次生矿物 ,与金的含氧矿物[4 ] 的产状对比 ,对了解富“难溶金”的载体矿物的氧化与金的次生富集的关系 ,提高金的回…