SUSTAIN RESERVOIR USEFUL LIFE BY FLUSHING SEDIMENT

ＳＵＳＴＡＩＮＲＥＳＥＲＶＯＩＲＵＳＥＦＵＬＬＩＦＥＢＹＦＬＵＳＨＩＮＧＳＥＤＩＭＥＮＴ￥ＨｓｉｅｈＷｅｎＳｈｅｎａｎｄＪｉｈｎ－ＳｕｎｇＬａｉ（Ｐｒｏｆｅｓｓｏｒ，ＵｎｉｖｅｒｓｉｔｙｏｆＣａｌｉｆｏｒｎｉａａｔＢｅｒｋｅｌｅｙ，Ｄｅｐａｒｔｍｅｎ...     

内蒙白旗地区火山碎斑熔岩斜长石成分及其有序度

白旗碎斑熔岩中斜长石以更长石为主，其有序度低，指示了岩石高温火山成因的特征，从岩体边缘相到中心相至根部相，长石类型，化学成分和有序度具有一定的变化规律，反映了岩体不同岩相带成岩条件的差异性。     

铁山港湾生原要素的变化特征及其影响因素

本文根据1999年12月的调查资料，分析探讨了广西沿海东部东部铁山港湾生成要素的变化特征及其影响因素。结果表明：本水域生原要素含量不高，与相邻的北海湾相比略低，但与1984年岸调的结果相比，N和Si呈上升趋势，P则呈下降趋势，N以陆源输入影响为主，而P和Si则以有机体分解的再生过程影响为主。     

CO<Subscript>2</Subscript>-rich fluid inclusions with chalcopyrite daughter mineral from the Fenghuangshan Cu–Fe–Au deposit,China: implications for metal transport in vapor

CO₂-rich fluid inclusions containing opaque mineral crystals were found in the Fenghuangshan skarn-porphyry Cu–Fe–Au deposit in Tongling, Anhui, China. These inclusions show variable CO₂ contents and are accompanied by aqueous inclusions, both occurring as secondary inclusions in quartz and being locally associated with chalcopyrite mineralization. Laser Raman microspectroscopic analyses confirm the predominance of CO₂ in the vapor and the presence of H₂S as high as 8 mol%, and identify the opaque mineral with yellow reflectance color in the inclusions as chalcopyrite. More than half of the CO₂-bearing inclusions contains chalcopyrite, whereas few of the associated aqueous inclusions do so. The chalcopyrite, occupying less than 1% (volume) of the inclusions, is interpreted to be a daughter mineral, and calculated Cu concentrations in the inclusions range from 0.1 to 3.4 wt%. Copper is inferred to have been transported in CO₂-dominated fluids as HS⁻ complexes. The occurrence of chalcopyrite daughter crystals in CO₂-rich fluid inclusions indicates that CO₂-rich vapor has the capacity of transporting large amounts of Cu, and possibly Au. This finding has significant implications for metal transport and mineralization in hydrothermal systems enriched in CO₂, such as orogenic-type and granitic intrusion-related gold deposits.     

The prelude of the end-Permian mass extinction predates a postulated bolide impact

The mass extinction at the Permian–Triassic Boundary (PTB) is said to have been abrupt and probably caused by an extraterrestrial impact. However, evidence from the Global Stratotype Section and Point (GSSP) of the base of the Induan at Meishan, China, shows that the biotic crisis began prior to the level, in beds 25 and 26 at which the postulated impact event occurred. Evidence of such an earlier biotic crisis occurs in other sections in South China, and in central and western Tethyan regions. This event is characterized by the extinction of a range of faunas, including corals, deep-water radiolarians, most fusulinids and pseudotirolitid ammonoids, and many Permian brachiopods. In all sections, this extinction level is usually a few decimeters to meters below that of the main mass extinction in the event beds (25 and 26) at Meishan, and their correlatives elsewhere. This earlier extinction event happened before the postulated bolide impact at the level of beds 25 and 26, and constrains interpretation of the mechanisms that brought about this greatest mass extinction. Electronic supplementary material Supplementary material is available in the online version of this article at and is accessible for authorized users.     

路基边界对瑞利波检测影响的数值模拟研究

瑞利波检测被广泛应用于路基工程质量检测中,但对于瑞利波沿三维路基体的传播规律以及对检测结果的影响,尚缺乏深入研究.笔者利用有限差分软件FLAC3D,对单层介质半无限大体和三维路基体的瑞利波传播特性以及频散曲线进行了数值模拟分析;并与半无限体的瑞利波理论频散曲线进行了对比;讨论了三维路堤边界对瑞利波检测路基路面的影响.     

G856磁力仪在地磁台站建设中的应用与实践

本文通过泉州地磁台重建工程中的工作实践 ,阐述了G85 6磁力仪在建筑材料磁性检测、施工过程中磁性跟踪监测的应用与实践。     

甘肃沙区开发中果树资源的应用及良种区划

在论述甘肃沙漠戈壁地区的自然概况及沙区果树发展的现状之后,提出了甘肃沙区果树区划、适宜的优良果树树种、品种和果树在沙产业开发中的技术要点,并对沙区果树资源开发中需重点研究的问题提出了建议。     

Partitioning of F between aqueous fluids and albite granite melt and its petrogenetic and metallogenetic significance

The fluid/melt partitioning experiments on fluorine were carried out in the system albite-H₂O-HF atP = 100 MPa, 770°C ≤T≤800°C: and wt = 2% −6% conditions. The concentrations of fluorine in quenched glasses (melt) were determined by electron microprobe and those of fluorine in the coexisting aqueous fluid were calculated by the method of mass balance. The result shows that the fluorine was concentrated in granitic melt relative to the coexisting fluid. The partition coefficient D_F(wt _F ^F1 /wt _F ^Mt ) ranges from 0.35 to 0.89. It increases with increasing fluorine content in the system. This means that there is not just one single value of partition coefficient for fluorine in the granitic melt-fluid system. The partitioning behavior of fluorine in this system depends critically on fluorine and proton (H⁺) concentrations. Our data suggest that F-rich granitic melts exist in nature and that fluorine may not be an important complexing agent of metal elements in F-bearing fluids. The project was financially supported by both the National Natural Science Foundation of China (No. 49603048) and the State Key Laboratory of Mineral Deposit Research, Nanjing University.