The Qilishan gold deposit is located in the southern Zhaolai gold ore belt in the northwestern Jiaodong region． A total of seven gold ore bodies have been found in the mining area． Linglong gneissic biotite granite and the NE trending Lingbei fracture control the output and distribution of the gold deposit． The ore bodies with veined or irregular shape occur in the structural alteration zone． The ore bodies of different sizes are NE trending and SE dipping． The constituent minerals of the ores mainly include pyrite，chalcopyrite，native gold，electrum，argentite，matildite，hematite，quartz and calcite． The ores are characterized by metasomatic dissolution structure，as well as veined and brecciated structures． The ore-forming process is divided into four stages，namely quartz-，pyrite-，polymetallic-and carbonate stages． Study on fluid inclusion shows that the deposit is composed of gas-liquid two-phase inclusions ( I) and three-phase inclusions containing CO₂ ( II) ，and that the former dominates． The homogenization temperature is 259. 6℃--373. 7℃; the salinity of three-phase inclusions containing CO₂ is 5. 77%--9. 84% ( NaCl) ; the salinity of gas-liquid two-phase inclusions is 6. 58%-- 8. 54% ( NaCl) ; and the estimated ore-forming pressure is 55. 2--82. 2 MPa. According to the nonlinear relationship between the depth and pressure of the fluid in the fracture zone，the ore-forming depth of the Qilishan gold deposit is calculated as 5. 95--7. 14 km． It is preliminarily determined that the deposit is a mesophilic and hypothermal gold deposit．

Small granitic intrusions occur in the progressive metamorphic belts of the Chinese Altai orogen． SHＲIMP U-Pb analyses were performed on zircons separated from a tonalite intrusion and yielded a concordant age of 409． 6 ± 3. 7 Ma ( MSWD = 0. 93) ，restricting the emplacement and crystallization of the tonalite intrusion to the Early Devonian． Combined with the existing geological data of the contemporary large granitic plutons in the Chinese Altai orogen，the tonalite is considered to be formed together with other granitic rocks in a continental arc setting． The tonalite intrusion has consistent foliation with its country rocks，indicating the strain resulting in the regional deformation should be very strong during or after the early Devonian．

Sanjiang and Jiaodong areas are the important gold regions in China． The gold mineralization is correlated with the Mesozoic faults and its derivative faults in the granite or the contact zone between granite and base rock． The mineral mapping is one of the important approaches of prospecting mineralogy． The temporal and spatial band distribution of mineral，mineral combination and mineral typomorphism features are natural regularity rules，but this kind of band feature is sometimes hidden and thus in need of mineral typomorphism research and mapping to disclose this band feature and to serve for the prospecting of mineral． The changes of the mineral typomorphism feature are often embodied in the " through" mineral，the typomorphism features of the through mineral change like the gradient toward the ore body，and the changes of the features are most obvious and strongest toward the orebodies． The new American mineralogy mapping indicates the weak change of the mineral composition or structure will lead to the change of the shape and wave length position of the specific absorbent feature． Australian experiment lab investigation has held the reason of a series of mineral． The progress achievement of the remote sensing and computer analysis technology now permits a direct comparison directly between the lab and remote sensing data，so the good feature database of the experiment light spectroscopy can serve for drawing of the spacial distribution and remote sensing material． Mineralogy mapping raised the extensive emphasis in the international earth arena．

Geothermal resources is one of the most practical and competitive new energy at present，and there is abundant geothermal resources in the new coastal region． The article get the three following conclusion through the geothermal geological condition by the drilling strata and the condition of the reducing test: stratigraphic division is done by the analysis of formation lithology and the drilling aging; the water yield is higher than 100 m3 /h，the flow temperature is 67℃--71℃; the average geothermal gradient of the overlying strata is 3. 08℃-- 3. 33℃ /100 m．

Since different underground engineering contains different geological conditions，structure and excavation methods，their disturbing degree on the ground also differs，but ground surface settlement caused by excavation has one common point that they will form a ground surface settlement curve． Based on data statistical analysis，the article puts forward the relationship between point of inflection in digging tunnels with shallowburied method and the span of tunnel excavation against typical geological conditions in Changchun so as to predict the impact of tunnel excavation and improve reasonable ground surface settlement control standard． Ｒesearch result will be useful for study on ground surface control standard in digging tunnels with shallow-buried method and setting settlement standard．

The problems like cracking of the girder in the mid-span and the ever-increasing vertical deflection appear during the long term usage of the long-span continuous rigid-frame bridge． Post-tension tendon with reserved duct can increase the pre-stress of the main beam effectively，and decrease the long term span deflection in order to improve the performance of the girder． At the same time，the proper tension position is very crucial to optimise the stress distribution of the bridge and control the deflection increase． Combining with practical engineering， the authors analyze the influence of different positions of post-tension tendon ( including top-，weband bottom plate tendons) on the stress and deflection of the main beam，and find out the optimal position of post tendon．

In order to compensate for limitations of microscopic study on loess triaxial tests，taking the loess in Longxi area as an example，the authors established the loess triaxial test model by using PFC3D software and simulating triaxial shear test under the different confining pressures in 0 kPa，50 kPa and 300 kPa． Compared with laboratory triaxial shear test，the numerical simulation test has a guiding role in loess mechanical strength analysis．