SPATIAL CORRELATION ANALYSIS BETWEEN KARST ROCKY DESERTIFICATION AND LITHOLOGY IN DU‘AN YAO AUTONOMOUS COUNTY IN GUANGXI

Karst rocky desertification refers to soil degeneration process such as serious erosion of soils,exposure of basement rocks in great areas, dramatic decrease in soil productivity, and occurrence oflandscapes similar to harsh deserts on ground surface, etc. under vulnerable environmental backgroundtypical of karst in subtropical areas, due to interferences and destruction resulted from the unreasonablesocial and economical activities by human beings (Wang, 2002). As a matter of fact, it was res…     

GEOCHEMISTRY AND TECTONIC ENVIRONMENT AND RESERVOIR FORMATION OF MANTLE-DERIVED NATURAL GAS IN THE SONGLIAO BASIN, NORTHEASTERN CHINA

During several decades of exploration, a number of mantle-derived natural gas pools have been discovered in the vicinities of deep faults in the Songliao Basin, northeastern China. The natural gas in these pools has a δ 13C1 value of-16.5‰ to -24.2‰, a reversed arrangement in the amount of carbon isotopes in methane and its endogamous products (namely, Δ13c1 ＞Δ13c2 ＞Δ13c3 ＞Δ13c4 ), a 3He/4He value of 1.97 to 2.34× 10-6, and an 40Ar/36Ar value of 1063 to 1949. This indicates a mantle source for the natural gas. The trace elements Cd, In, Te and Re, never found in organic-sourced hydrocarbons, are highly enriched in certain crude oils from the Basin; respectively, concentrations of these elements were found to be 751, 28, 16 and 323 times the average crustal values in China, and this also supports a mantle-derived natural gas origin. The characteristics of mantled-derived magmatic rocks,hydrothermal fluids and gaseous fractions distributed in and near the deep Songliao Basin faults indicate that rifting tectonics is providing the mechanisms for this outgassing of the mantle. Deep extensional(normal) faults provide pathways for upward movement of these materials, and in the Songliao Basin,these deep riff fault zones are associated with reservoir occurrence and cap rock seals, forming good sites for accumulation of mantle-derived natural gas. Furthermore, a layer of low velocity, low density and high conductivity in the deep crust has been identified as a potential reservoir for mantle-derived natural gas.     

Study on the Safety of the Rock Mass in the Tongling Bank of Taipinghu Bridge

The Taipinghu Bridge is an important engineering construction, and the safety of rock mass of its foundation is very crucial. This article adopts FLAC 3D to analysis the geologic model. The simulating process shows that no mater the excavating process or the loading process the rock mass are safe. The modeling and analyzing process can be used for reference.     

Degradation of Microbes for the Crude Oil Contaminants

Production and storage-transportation of crude oil can not only give rise to soil pollution but also destroy ecological environment. Degradation of microbes for oily soil was studied with the instnunent, Geofina Hydrocarbon Meter (GHM), by experimental analysis qualitatively and quantitatively in the paper. Analytical result showed that the crude oil could be considerably degraded by eating-oil microbes in oily soil and the number of eating-oil microbes increased while the working hours of oil-well rising. As a result, contaminated oil could be degraded more quickly by a lot of eating-oil microbes in the soil. At the same time, the degradation rate of contaminated oil increased gradually as the time went on. In addition, amount of gaseous component in the oily soil samples increased with degraded time and the microbes could selectively consume contaminated oil strongly, so biedegradation might alleviate the degree of contamination and destruction to the soil and environment in the process of oil product     

NUMERICAL EXPERIMENT ON THE SEASONAL VARIATION OF GLOBAL OCEAN AND THE EL NINO PROCESS:PARTI:CONTROL EXPERIMENT ON THE SEASONAL VARIATION OF GLOBAL OCEAN

A 6-layer,4°×5° horizontal resolution global ocean model has been designed and improved.After a 100-year in-tegration,an equilibrium state has been reached from the upper to lower layers.By taking the mean state of last l0 mod-el years as climatic state,we analyzed the characteristics of the seasonal variation in our model integration.The resultsshow that the simulated seasonal variation is similar to the observed.So the design of our model is successful.Then,us-ing the simulated climatic state of the seasonal variation as the initial state,and the observed stress and thermal state asthe atmospheric forcing,we simulated the process of El Nino in 1972—1973 successfully.The simulated results of sea-sonal variation using our model will be presented in part I.     

STUDY ON THE MATHEMATICAL MODEL OF HEAVY－METAL POLLUTANT TRANSPOPT－TRANSFORMATION IN RIVERS

ＳＴＵＤＹＯＮＴＨＥＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＯＦＨＥＡＶＹ－ＭＥＴＡＬＰＯＬＬＵＴＡＮＴＴＲＡＮＳＰＯＰＴ－ＴＲＡＮＳＦＯＲＭＡＴＩＯＮＩＮＲＩＶＥＲＳ￥Ｓｕｉ－ｌｉａｎｇＨｕａｎｇａｎｄＺｈａｏ－ｈｕｉＷａｎ（ＰｏｓｔｄｏｃｔｏｒａｌＦｅ...     

Geometric and Dynamical Characteristics of Sequences in Yitong Graben

ＧｅｏｍｅｔｒｉｃａｎｄＤｙｎａｍｉｃａｌＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＳｅｑｕｅｎｃｅｓｉｎＹｉｔｏｎｇＧｒａｂｅｎ￥ＸｉｅＸｉｎｏｎｇ；ＳｕｎＹｏｎｇｃｈｕａｎ（ＤｅｐａｒｍｅｎｔｏｆＭｉｎｅｒａｌＲｅｓｏｕｒｃｅｓ，ＣｈｉｎａＵｎｉｖｅｒｓ...     

Evidence of Bio-Organic Mineralization

ＥｖｉｄｅｎｃｅｏｆＢｉｏ－ＯｒｇａｎｉｃＭｉｎｅｒａｌｉｚａｔｉｏｎ￥ＺｈａｎｇＡｉｙｕｎ；ＷｅｎｇＣｈｅｎｇｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｎｅｍｙＲｅｓｏｕｒｃｅｓＧｅｏｌｏｇｙ，ＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＧｅｏｓｃｉｅｎｃｅｓ，Ｂｅ...     

Basic Facts Concerning Strength of Sandstone

ＢａｓｉｃＦａｃｔｓＣｏｎｃｅｒｎｉｎｇＳｔｒｅｎｇｔｈｏｆＳａｎｄｓｔｏｎｅ￥ＺａｖｏｄｃｈｉｋｏｖａＭａｒｉａ（Ｓａｎｋｔ－ＰｅｔｅｒｓｂｕｒｙＭｉｎｉｎｇＩｎｓｔｉｔｕｔｅ，Ｓａｎｋｔ－Ｐｅｔｅｒｓｂｕｒｇ１９９０２６；）（Ｅｅｐａｒｔｍｅｎｔ...     

成矿学的过去、现在和将来

成矿学起源于大约１００年前，在地学领域中已赢得了特定的地位。笔者将成矿学细分为经验成矿学、矿床成因论和应用成矿学，系统地论述了三者的关系及其发展简史，并展望了现代电子技术对成矿学研究方法的重大影响。对成矿学研究的现状和困难也做了一些分析。本文强调矿床实际资料的积累、加工、储存（信息库）和全球范围的交流。着重指出：细致描述和用图示记录目前开采矿床的重要性；用全部学识记录和处理岩石和（或）矿石样品的重要性以及利用多种文字的地区性文献（如野外报告或地质图）提供全球性资料的重要性。