Three new species of fossil woods are reported from the Upper Jurassic to Lower Cretaceous in southeastern Mongolia，including Protaxodioxylon mongolense sp． nov． Circoporoxylon mongolense sp． nov． Protocircoporoxylon mongolense sp． nov． The anatomical characters of three new species are described in detail．

Lode 28 is the largest gold-bearing quartz vein in Haigou gold deposit，and the lode itself contains more than 30t of gold． Geochemical study shows that 12 trace elements related gold mineralization can be divided into 5 metallogenic factors ( element assemblages) ． The high values of F1，F2 and F4 together indicate overlapped of multiple stages of gold mineralization，revealing high potential of gold mineralization at depth; the single high value of F4 represents the root of an existing ore body while high values of F3 and F4 show the intervals of barren sectors in the lode． Comprehensive geochemical studies show the high prospection potential below the 14th level and between lines 39-71． It is also prospective to look for blind ore-bodies between lines 15-29 and below the 10th level．

Sipingshan gold deposit is gold-bearing sillcalite in type． There only exist a few kinds of sulfide in the ore and it is lower in content． The gold degree is lower． Au is closely related to the Ag，Cu，Pb，As and Hg elements． The upper sillcalite has Eu and Ce negative anomaly，and the lower sillcalite has Eu positive anomaly． however，the hot spring cemented breccia and rhyolite porphyry have Eu negative anomaly; the S isotope component has deep-seated magmatic sulfur and terrestrial sulfate characteristic; and the Pb isotope has the character of the mixture origin of crust and mantle that is mainly dominated by Pb in the orogenic belt． The oreforming fluid temperature is 180℃-244℃，characterized by magmatic hydrothermal and meteoric water; and the ore-forming age is 87 Ma． The deposit was formed by the metallogenic fluid in the tectonic fault zone overflowing near the earth’s surface and leading to the metallogenic function and the metallogenic substance deposition．

In the conditions of low Signal-to-Noise Ratio ( SNR) of seismic data and a small quality of log information， the consequences of seismic interpretation through the impedance inversion of seismic data could be more precise． Constrained sparse spike inversion ( CSSI) has advantage in oil and gas reservoir predication because it does not rely on the original model． By analyzing the specific algorithm of CSSI，the accuracy of inversion is controlled． Oriente Basin in South America has the low amplitude in geological structure and complex lithologic trap． The well predication is obtained by the application of CSSI．

There are large scale chert formations of different ages exposed widely in southern Tibet，along Yarlung-Zangbo suture zone． The typical chert specimens were sampled from Pengcuolin，Xialu and Zongzhuo profiles． Multivariate statistical analysis is applied for effectively extracting the geochemical information of the chert，and the raw data are processed by R-factor analysis． The first，second and third factors representing terrigenous， authigenic and hydrothermal constituents are extracted from the analysis results． From Pengcuolin， Xialu to Zongzhuo chert profiles，the variance ratios of continental and authigenetic factors become higher ( 51. 1%→62. 9%→91. 6%) ，while hydrothermal factor rapidly decrease( 40. 9%→32. 2%→0) ． This tendency also present in the analysis for trace elements，indicating that Pengcuolin chert is hydrothermal origin，The Zongzhuo chert belong to normal sedimentation and the Xialu chert exhibit normal deposition interacted with hydrothermal sedimentation． The facts provide significant implications for understanding the diagenetic and palaeomineralization information of southern Tibet．

According to earthquake data of Fushun earthquake administration，the seismic analysis and statistical methods are utilized in order to analyze earthquake frequency，“b”-value timing and energy creep trends in Laohutai coal mine． By using least squares linear regression method，the relational expression between frequency and magnitude of mine earthquake in Laohutai coal mine is given． And the possible largest magnitude mine earthquake inferred has also been calculated． And this paper also provides a theoretical basis for further study of mine earthquake activity．

Soil salt transformation plays an important role in the freeze-thawing process，which is also one of basic problems of cryopedology． The very special law is made up of the two time salt-moisture transfer under freeze-thawing condition． Based on the latest research at home and abroad，through the investigation of soil moisture-salt change in the freeze-thawing process，the conclusion is made that the soil water potential gradient is the main driving force of soil salt movement and the factors are of quantities． The research shows that，when freezing，temperature drops，salt and moisture move towards frozen layer． All make the salinity content of the frozen layer increase significantly． In the thawing process，salinity and moisture in the soil move up again with evaporation and makes the salt second migration．

Based on the relationship between the diameter and buried depth of goaf，the authors establish the forward modeling by Res2dmod and inverse the model by Res2dinv． Thus，three kinds of models are obtained: the model of single resistivity anomalous body，model of double different distance resistivity anomalous body， and model of layered resistivity anomalous body． Using forward and inversion，the image of detection is simulated， and the reliability is proved by comparing with the engineering examples．