The mylonites occurred in the fracture zones are studied by dynamically recrystallized quartz grains． The natural microstructures in mylonites are simulated and the deformation conditions of mylonitization are estimated by fractal analysis，recrystallized grain size paleopiezometer and flow laws of quartzite． Depending on fractal analysis，the deformation temperature of mylonitization is approximately 600℃，which presents high greenschist facies to low amphibolite facies． The mylonitization occurred at differential stresses of 9． 1 --10. 7 MPa ( lower limits) ． Compared with extrapolation of quartzite flow laws and estimates of fractal analysis，the strain rate of mylonitization is under 10 － 13. 8 /s．

The shape，texture，content and ＲEE characteristics of zircons from the O2 tnd-1，O3 tnd-2，O3 tnd-3 pyroclastic rock of Tanjianshan Group on the north margin of Qaidam Basin indicate that the O2-3 tnd is the product of volcanism during the transitional period from ocean-land interim crust to oceanic crust． The U-Pb surface ages obtained from O3 tnd-2 and O3 tnd-3 can be divided into 9 groups，every age group coincides with the period when significant tectonic-heat event took place at Oulongbuluke micro-continental base of northern Qaidam，suggesting that the base rocks have provided materials for the formation of sedimentary and volcanic rock in O2-3 tnd ． The volcanic rocks of O3 tnd-3 formed at 440 Ma，with time gap 46 Ma to those of O1 tna-1 and O3 tnd-3 may represent the minor period that Xitieshan back-arc extension have lasted，the scale of back-arc basin that formed in Xitieshan extension may approach to 1 400 km． Based on the test of ithochemistry data for major elements and analysis of Sr isotope geochemistry for the clastic sedimentary rock in O1 tna-2 and O3 tnd-2，the authors get the conclusion that the O1 tna-2 and O3 tnd-2 of Tanjianshan Group may form in back-arc basin environment，while the lithology difference between these two formations may reflect the changes of geodynamic processes as the diagenesis tectonic environment transformed from continental margin depression to adjacent sea basin．

Exhaustion of profitable coal resources makes for need of innovation including underground coal gasification ( UCG) ． One of the most important problems of UCG is evaluation of the combustion area in underground coal seams． Physicochemical parameters of coal，in a whole，and coal mineral substance are changed under heating and combusting． Thermo-chemical conversion of coal mineral components has an effect on magnetic characteristics of coal seam and can be used for real-time control of combusting area． To this guessing check laboratory experiments have been made as an activity of the Far Eastern Federal University． Our investigation based on a theoretical analysis and laboratory simulation tests． Typical results of the laboratory experiments are presented below． Under heating coal thermo-chemical magnetization is forming． Coal's magnetic parameters varieties from anti-ferromagnetiс to ferromagnetic． Anti-ferromagnetic pyrite and siderite presented into coal mass is transformed into magnetic hematite and magnetite under heating． Therefore，geomagnetic is expected to be a useful geophysical tool to for evaluation of combustion volume and its migration for underground coal gasification．

The application of wireline formation tester ( WFT) gradually extends in oil-field with the constant improvement of instrument functions． Applications of WFT in oil and gas exploration in Tarim Oilfield，such as formation pressure measurement，are described，and testing efficiency between drill stem testing ( DST) and WFT are compared，especially comprised of PVT sampling，hydrocarbon composition estimation，fluid characterization analysis and formation permeability analysis． The test results between WFT and traditional DST show that their functions can be complementary． The influence factors of WFT and the suitable applying conditions for WFT and DST are also discussed．

In seasonal frozen soil region，the engineering geological properties of loess-like soil will be deteriorated after freeze-thaw cycles． Through the freeze-thaw cycle experiment of remolded loess-like soil，under different freezing temperatures，the authors carried out freeze-thaw cycle tests for 3 times and 20 times，respectively． With mercury intrusion porosimetry and granulometric analysis，from the micro-structure，the authors studied the law that freeze-thaw cycle times and frozen temperature effect on the variation of microscopic pore of loesslike soil． This result can provide theoretical basis for comprehensive treatment of problems in the construction of the project in seasonal frozen loess-like soil region．

On the basis of geological investigating work and experimental studies on slide zone soil of one landslide in Tibet，the authors analyzed granulometric composition，clay mineral composition and physical and mechanical properties for the soil in the slide zone． The soil samples are gravel containing fine particle． Particles larger than 2 mm occupy the main proportion with the content 51. 5%--68. 5%． The relative content of clay minerals is low． The clay minerals are illite smectite mixed layer and kaolinite，and their relative contents are 6% --13% and 4%-11%，respectively． The main mineral ingredient is quartz and the relative content is over 30%． Therefore，the soil’s hydrophily is poor． The cohesion and internal friction angle are high，causing preferable physical-mechanical features of slide zone soil． On the basis of the obtained data，the landslide stability is evaluated by means of limit equilibrium method． The safety factors are 3. 191 and 1. 92 respectively under both natural and normal water level conditions． The study results show that the landslide is stable． It can provide the appropriate basis and reference for landslide stability evaluation and landslide control in Tibet．

From China to Ｒussia，Tan-Lu fault system stretches for thousands of kilometers，towards NE 30°． The authors have collected more than ten magnetotelluric profile that China and Ｒussia have carried out，in the studied area of the Tan-Lu fault's northern section，and have analyzed electrical characteristics of the relevant profiles． Deriving the following conclusions: ( 1) Jiamusi-Bureya plots，etc．，demonstrate the high resistance of Kernel; ( 2) Fold belt attributed to the land showed high and low resistance stitching，associated with not only terrane accretion，but also upper mantle upwelling; below the sedimentary basin，the resistivity of the upper mantle is lower and closer to the surface comparing with the adjacent area( 100-150) ; ( 3) In the system of Tan-Lu fracture，Yishu and Dunmi fracture，etc． are expressed as vertical low-resistivity zone; ( 4) There may exist subducted old-fashioned piece under Jiamusi and Bureya plots．