The unique nature in ore composition,geological backgroudd and metallogenic mechanism of non-conventional superlarge ore deposits: A preliminary discussion

The unique nature of four non-conventional superlarge deposits: the Bayan Obo deposit, the Shizhuyuan deposit, the Dachang deposit and the Franklin Furnace deposit is discussed. It is postulated that the unique nature of these deposits is related to the rare geological processes and their coupling.

     

锰结核矿物及其原位复合材料吸氢性能的初步研究

采自东太平洋中国开辟区的锰结核，主矿物相为钡镁锰矿、钠水锰矿，以及属XRD隐晶质的针铁矿与四方纤铁矿，部分矿物相结构特征与人工合成的纲伙碳管十分相似。在室温中压下采用等容压差法测量了锰结核的气态贮氢能力，测得锰结核样品的吸氢量为0.31%。以乙炔为碳源，在750℃下采用气相沉积法直接在锰结核上成功地催化制备出多壁纳米碳管和纳米碳纤维，同样条件测试这种矿物碳管原位复合材料的吸氢性能，其吸氢能力达到1％左右。保持锰结核矿物结晶结构在加热脱水过程中的稳定性，对提高其贮氢能力至关重要。     

钛酸脂改性坡缕缟石化学气相沉积生长碳纳米管

以钛酸脂改性坡缕缟石为催化剂，利用化学气相沉积法催化裂解乙炔，在高温下成功地制备了多壁碳纳米管，认为坡缕缟石释放的金属铁起到了催化乙炔的作用，讨论了它的形成条件，指出在800℃条件下生长的碳纳米管质量最好、产率最高，若催化反应温度过高则会降低产品的质量，催化温度低于700℃时不能用来制备碳管。与传统的过渡金属催化剂相比，这种矿物催化剂原料成本低廉，制备工艺简单，有利于碳纳米材料合成的工业化生产。     

水/岩比的地球化学意义

通过对水－岩反应过程中水／岩比的深入分析,从理论上澄清了前人在水／岩比概念上的错误和混乱,并定义和厘定了流体／岩石比和水／岩比,以及“真实”流体／岩石比和表观“流体／岩石比之间的关系,重新审视了它们的地质意义。     

Rare-earth elements in Luochuan loess section,Shaanxi province

TheΣ REE in loesses of different ages in the Luochuan section shows a narrow range of variation, indicating the homogeneity of loessic materials in chemical composition. The REEs in loess are concentrated mainly in silt-sized detrital minerals. Loesses and paleosols of different ages all are relatively enriched in rare-earth elements of the Ce family, and show similar REE distribution patterns. The fractionation among various REEs in the loess is different from that in morainic, marine and lacustrine sediments, but is similar to that in sand samples from deserts in Northwest China. The ratios of Ce/Ce* and Eu/Eu* reflect that the provenance of loessic materials and their accumulating area are all in an oxidation environment with weakly basic mediums under arid or semi-arid climate.     

QBO-like Oscillations Induced by Local Thermal Forcing

A zonal-vertical two-dimensional equatorial model is used to study the possibility that the long period oscillation of the zonal mean flow occurring in the lower equatorial stratosphere (QBO) is caused by local thermal ac-tivities at the tropical tropopause. The model successfully reproduces QBO-like oscillations of the zonal mean flow, suggesting that the local heating or cooling at the tropical tropopause is probably the main reason of QBO’s genera-tion. The analysis of the dependence of the oscillation on the wave fencing indicates that the oscillation is not sensible to the forcing scale. The model can reproduce QBO-like oscillations with any forcing scale if the fencing period and amplitude take appropriate values, proving that the internal gravity waves generated by local thermal source take much important roles in QBO.     

影响蔬菜周年供应的原因及其对策

影响蔬菜周年均衡供应的原因是多方面的，不利的天气气候影响是主要原因之一。广西以广州市为例，剖析了影响蔬菜年供应的原因，并提出缩短淡季实现周年均衡供应的对策。     

The Principle of the Drilling by Impregnated Diamond Bits and the Classification of Rocks

Recently impregnated diamond bits have been widely applied in drilling hard and me-dium-hard formations in the world.It is quite necessary to study the fracturing mecha-nism of the impregnated diamond bit and the classification of rocks,which can realizeoptimum drilling.Using multi-parameter rotary test stand can monitor and print nineparameters.The diamond size and concentration for experiment are various and there arenearly200 types of samples,numbering over1000 pieces.The results of laboratory arethe same as those in the field.Besides,this paper expresses that the diamond concentra-tion of impregnated diamond bits effect the bonding strength of diamond imbedded in ma-trix.During drilling by impregnated diamond bits three ways are used to cool the bits.The contact area between impregnated diamond layer and flow,and the drilling flowthrough annulus carrying away heat with conduction form can be shown by equations.Itis impossible to classify the rock drillability only by using single factor.The best met     

汉南杂岩与金成矿特征

汉南杂岩区位于扬子地台北缘,围岩为元古界绿片岩 勉县—洋县深大断裂系统在成岩、成矿与盆地形成方面占有重要的地位.杂岩体由斜长花岗岩、二长花岗岩、钾长花岗岩、石英闪长岩和辉长辉绿岩组成.金矿化类型主要有石英脉型和蚀变岩型,与接触带、断裂带、蚀变带有关,蚀变后岩石矿物成分变化.使金重新分布,砂金分布与金源、地貌和新构造运动关系密切.