The Middle Jurassic Hangfanggou Formation is well exposed in Shangsanjiao and Xiasanjiao villages area，Baimashi town of Huludao，western Liaoning，China． Ｒecently，abundant fossil plants were collected from the Hangfanggou Formation． One new species，Anomozamites sanjiaocunensis sp． nov． (Bennettitales)，is described in this study． This is the first report of the genus Anomozamites from the Haifanggou Formation based upon the leaf morphology and epidermal structures． The discovery of the new species extends significantly the stratigraphic and geographic distribution of Anomozamites in the Middle Jurassic． It also shows that Ano- mozamites was a common member of Bennettitales once lived in the Middle Jurassic warm temperate region． The new species also improves the knowledge on understanding the leaf morphology，epidermal features and the di- versity of Anomozamites during the Middle Jurassic． The epidermal characters of the new species and its associ- ated plants reveal that the plants grew in a warm and moderately humid environment in the warm temperate zone． The presence of some deciduous plants，such as ginkgoaleans，czekanowskialeans and conifers，indicate the climate with seasonal fluctuations in temperature．

The Urad Zhongqi mafic intrusions crop out in western Inner Mongolia and are dominated by horn- blende gabbro． Zircon LA- ICP- MS U- Pb dating indicates that the mafic pluton was emplaced in the Early Per- mian (272 ±3Ma)． The hornblende gabbro rocks have low concentrations of SiO 2 ， high total Fe 2 O 3 ， MgO， Ni， Co，Sc and Cr． The rocks are characterized by selective enrichment of large ion lithophile elements (LILE) and light rare earth elements (LＲEE)，and depletion in high field strength elements (HFSE) (e． g． Nb，Ta，Zr， Hf，P and Ti)． It suggests that they formed from a primary magma generated by the partial melting of lithos- pheric mantle material had been previously modified by subduction- related fluids． According to the geochemical data and the geology of the region，the authors found that the Early Permian hornblende gabbroic in western In- ner Mongolia formed in a post- collisional extensional setting．

Zircon U- Pb age， whole rock geochemical and zircon Hf isotopic data are presented for Late Paleozo- ic granodiorites from the Taerqi region，central Daxing'anling to constrain its petrogenesis and tectonic implica- tion． LA- ICP- MS zircon U- Pb age data indicates that the Late Paleozoic granodiorites were emplaced with age of 333.4 ± 2.2 Ma (Early Carboniferous)． Geochemically，the granodiorite samples have SiO₂ = 60.54%-71.40%，Na₂O =4.04%- 4.66%， K₂O = 1.65%- 4.27% and MgO =0.96%-3.53%， belonging to medium- K to high- K calc- alkaline I- type granites． They are slightly enriched in large ion lithophile elements (e.g. Ｒb，Th， U and K) and light rare earth elements，and depleted in high field strength elements (e.g. Nb，Ta and Ti)， with ε Hf (t) values of 8.0- 11.8 and Hf two- stage model ages of 586- 829 Ma． All these geochemical features suggest that the primary magma was derived from partial melting of Neoproterozoic to Phanerozoic newly accreted lower crust． According to the geochemical data and regional geological investigations，the Early Carboniferous granodiorites formed in an island arc setting linked to the subduction of the Paleo- Asian Oceanic Plate beneath the Xing'an Terrane． This also implies that the Xing'an and Songliao terranes have not amalgamated before the Early Carboniferous．

A detailed investigation on 3D spatial distribution rules of Banded Iron- bearing Formation(BIF) with methods of gravity- magnetic inversion and 3D modeling of iron mine is presented based on the former analysis in the Anshan- Benxi area． Three dimension spatial distribution types of BIF are concluded as hook- like，tabular- like and“W” - like． BIF was mainly developed in three types of space including (1) the syncline cores，(2) cover coverage area，and (3) the deeper buried area where the range of tectonic uplift is small． The influences of tectonism，magmatic intrusion and uplift- erosion on the spatial distribution shapes of BIF are clarified．

It is helpful to improve the seismic design theory of long- span continuous bridges for studying the seismic performance of each cantilever construction state． Taking the Bridge 1 in the north of Changbai- Moun- tain international tourism resort as an example，the authors studied it in shutdown phase and the cantilever con- struction process，established the simulation model by using Midas/civil，and analyzed time- history of each construction stage for the bridge． The study shows that long- span bridge cantilever construction in northeastern China can be divided into two- year tasks for construction (suspending in winter)． It is needed to think about seismic stability of the cantilever position in shut- down phase of winter． The effect of longitudinal vibration is the most disadvantageous influence to bridge， and its calculation results can provide reference for seismic design of similar bridges in the future．

Ｒeverse Time Migration (ＲTM) is a high precision imaging method of seismic wavefield at present， but low- frequency noises severely affect its imaging results． Thus one of most important aspect of ＲTM is to se- lect the proper noise suppression method． The wavefield characteristics of the Poynting vector are analyzed and the upgoing，downgoing，leftgoing and rightgoing waves are decomposed using the Poynting vector of the acous- tic wave equation． The normalized wavefield decomposition cross- correlation imaging condition is used to sup- press low- frequency noises in ＲTM and improve the imaging precision． Numerical experiments using the Mamousi velocity model are performed and the results demonstrate that the upgoing，downgoing，leftgoing and rightgoing waves are well decomposed using the Poynting vector． Compared with the normalized cross- correlation imaging and Laplacian filtering method， the results indicate that the low- frequency noises are well suppressed by using the normalized wavefield decomposition cross- correlation imaging condition．

Based on the compressive sensing，a novel algorithm is proposed to solve reconstruction problem un- der sparsity assumptions． Instead of estimating the reconstructed data through minimizing the objective function， the authors parameterize the problem as a linear combination of few elementary thresholding functions，which can be solved by calculating the linear weighting coefficients． It is to update the thresholding functions during the process of iteration． The advantage of this method is that the optimization problem only needs to be solved by calculating linear coefficients for each time． With the elementary thresholding functions satisfying certain constraints，a global convergence of the iterative algorithm is guaranteed． The synthetic and the field data re- sults prove the effectiveness of the proposed algorithm．

The identification of fractures is of great importance in gravity and magnetic data processing and in- terpretation． In this study，four fracture identification methods are applied，and widely used in processing and analysis of the gravity anomaly，including vertical second derivative method，tilt derivative method，theta map method and normalized differential method， for gravity data acquired in a given area in Heilongjiang． By compa- ring the distribution of the zero contour or maximum contour，we summarize the application effects，and both advantages and disadvantages of each method． It is found that tilt derivative method and normalized differential method provide better effects than other two methods: the narrower anomaly gradient belt and higher identifica- tion precision of fracture or geological boundary． The inferred fractures and geological boundaries have a great match with the results obtained from geologic map and remote sensing data interpretation． Those study results have definitely provided the theoretical foundation for identifying faults and the geological boundaries．

As an important geophysical tool，high density electrical technique infers the underground geological structures by processing and inverting the apparent resistivity data． Currently，the false anomalies have been frequently occurred in the graph of apparent resistivity pseudo- section or inverted geoelectrical section obtained from high- density electrical technique，and are difficult to remove． In this study，the authors explain the mech- anism of the false anomalies and put forward the horizontal differential field method to identify the false anoma- lies． Based on the analysis of modeling results，this method is applied in the surveying data in Xinlei Quarry of Jiuquan，and the results confirm the effectiveness of the horizontal differential field method．