Present article is on Russian Far East carnivorous dinosaur paleoecology． Described summary is based on detailed study and comparison of isolated shed teeth morphology．

Gas Hure Oilfield is the biggest one in the Qaidam Basin． Through intensive sampling and GC-MS analysis， the authors analyzed the geochemical characteristics of the crude oils in the Gas Hure Oilfield． The results show that the crude oils have even-odd carbon predominance for n-alkanes． In shallow reservoir，part of crude oils suffered biogenic degradation． As for normal oils，they have low Pr /Ph ratios with abundant gammacerane and C35 homohopane，which indicate that the crude oils are formed in strong reducing salt water environment． Compared deep ( E13 ) reservoir with shallow ( N1 － N12 ) reservoir，the ancient salinity of sedimentary environment of N1--N12 crude oils is slightly higher than that of E13 crude oils; the C － 21 /C + 22 ratios of crude oils are 1. 02-1. 71 with a higher abundance of C27 sterane，which shows that their mainly origin matrix are bacteria and algae; the C29 sterane 20S /( 20S + 20R) is generally low，the ratio in deep E13reservoir distributes between 0. 31 and 0. 40，but in shallow reservoir is relatively low with 0. 29-0. 36． At the same time，C29 sterane αββ/( αββ + ααα) and Ts /Tm both are extremely lower． All the above show that the crude oils in Gas Hure are mainly low mature oils，although the maturity of deep reservoir crude oils is slightly higher than shallow one．

The Wadi Bayhan mafic-ultramafic intrusions associated with magmatic PGE-bearing Cu-Ni sulphide deposit are located in the south margin of the Arabian-Nubian Shield，SW Yemen． The intrusions consist of dunite， olivine-pyroxenite，lherzolite，hornblendite，gabbro and gabbronorite． The dunite and lherzolite are the main host rock for the Cu-Ni ores． The new data of the chemical compositions of the rocks have SiO2 ( 50%- 53. 6%) ，Al2O3 ( 0-32%) and MgO ( 4%-28%) ，and relatively low TiO2 ( 0-3. 2%) and K2 O + Na2O ( 0. 04% － 5. 2%) ． The geochemical characteristics indicate that the parental magma is high-magnesium tholeiitic． Sulfur had reached saturation and immiscible sulfides droplets segregated from silicate magmas before their emplacement．

The Wadi Sharis orogenic gold deposit in northwestern Yemen is related to the fault and shear zones vein at medium depth in the crust in the Neoproterozoic meta-sedimentary and meta-volcanosedimentary succession of greenschist to amphibolite facies metamorphism． Three distinct fluid inclusion types have been identified in the gold-bearing quartz sulphide veins of the deposit: ( 1) type I: vapour-liquid two-phase ( VH2O － LH2O ) ， ( 2) type II: three-phase CO2 ( VCO2 － LH2O － LCO2 ) and ( 3) type III: vapour-rich ( LCO2 － VCO2 ) inclusions． Six analysis of individual fluid inclusion indicate the fluid inclusions comprise mainly of H2O and CO2 ． Formation P-T conditions recorded by fluid inclusions in quartz crystals correspond to 180℃-380℃ and up to 130 MPa，as indicated by high-density CO2 bubbles ( up to 0. 98 g /cm3 ) observed in some inclusions． The estimated crystallization pressures correspond to approximately 4-10 km of overburden，assuming a lithostatic load． The salinity ranges from 0 to 22 wt%． The deposit holds at 0. 2-5 g /t Au and contains low-moderate salinity．

the Sishanlinchang gold-silver deposit is mainly composed of gold-quartz vein type ores． It has many kinds of sulfides and gold in high grade． The Au has a close correlation with As，Pb，Ag and Cu． Geochemically， the deposit is characterized by relatively enrichment in LREE with moderate or lower Eu negative anomaly． Sulfur isotopes appear as single and deep source，and lead isotopes indicate the Pb is from the earth's mantle and crust，which mainly are orogenic belt Pb，the ore-forming fluid has a temperature of 215℃ － 350℃ and a low salinity with a mixture of characteristics of magmaitc hydrothermal and meteoric water． The ore-forming age is 111. 1 － 111. 4 Ma． The deposit is formed in mineralization and precipitation of metallogenic materials caused by the mixture of the magmatic hydrothermal fluid and meteoric water．

Changbaishan volcano is the largest potential eruptive volcano in China． In this paper，seismic activity， horizontal displacement，vertical displacement and the fluid geochemistry data acquiring from Changbaishan Tianchi Volcano Observatory ( TVO) in recent years are analyzed． The authors discussed the ability for the Changbaishan volcanic seismic monitoring and active level of Changbaishan volcano in recent years based on the fundamental monitoring results． The results show that Changbaishan volcano has experienced an unrest episode from 2002 to 2005，but its active level recovers to the background now．

Principal Component Analysis ( PCA) can simplify the structure of database by replacing multidimensional parameters with relatively less comprehensive variables in order to ensure the minimum lost in initial data． In this paper，eighteen black soil samples from different sites were tested and thirteen distinctive indexes were chosen to evaluate the degeneration of black soil． By using principal component analysis，variables of thirteen dimensions can be diminished to six unrelated principal indexes． Analysis shows that the soluble salt content，Fulvic acids ( FA) and aggregation degree have a high weighing coefficient，indicating these three indexes are the major parts for the evaluation of black soil degradation． It also provides a new path to the degenerated black soil treatment in Northeast China．