AGE OF THE LONGYIN FORMATION IN SOUTHWEST GUIZHOU PROVINCE——A DISCUSSION ABOUT THE CORRELATION OF THE LOWER PERMIAN BETWEEN SOUTH CHINA AND THE URAL OF USSR

The Permian Artinskian age of the Longyin Formation is indicated by the appearanceof the ammonoid Popanoceras fauna at its lowermost part. The upper Maping Formationin South China should include all the Sakmarin deposit at least.     

SILURIAN-DEVONIAN COUPLING OF THE NORTH CHINA AND YANGTZE PLATES: EVIDENCE FROM THE GEOCHEMISTRY OF SEDIMENTARY ROCKS

Major and trace element compositions of a large number of Proterozoic-Tertiary finegrained clastic sedimentary rocks from the Qinling Orogenic Belt and its adjacent southern margin of the North China Platform and northern margin of the Yangtze Platform reveal that the North China and Yangtze plates were coupled during the period of Silurian to Devonian.     

CRUSTAL STRUCTURE OF THE SOUTH CHINA SEA BASIN

Based on the results from prospcction of seismic sonobuoy and two-ship refraction measurement, structural characteristics for earth crust of South China Sea Basin are analyzed: very thick crustal Layer 1, normal crustal Layer 2 and abnormally thin crustal Layer 3 are observed, with Layer 3 increasing continuously in thickness towards NS direction from the centre of the basin, and the earth crust becoming thick accordingly. These structural characteristics are in conformity with Cenozoic sea spreading mode inferred from magnetic anomaly. Finally, possible causes that account for these characteristics are discussed.     

THERMAL STRUCTURE OF THE CRUST AND UPPER MANTLE OF LIAOHE RIFT BASIN, NORTH CHINA

On the basis of analysing terrestrial heat flow and mantle heat flow values, the crustal temperatureat depth was calculated for Liaohe Rift Basin in North China, and a conceptual model of thermal struc-ture of the crust and upper mantle of the Basin has been suggested. Results indicate that Liaohe Basinis characterized by a relatively high mantle heat flow (0.98 HFU) but low crustal heat flow (0.57HFU),both caused by upwelling of the asthenosphere and crustal thinning during rifting process in early Eo-gene in thc region studied. This sort of thermal structure of the crust and upper mantle seems to beinherent in the region in between tectonically stable and active areas and has been considered to be theproduct of the history of geological evolution of the Basin since Mesozoic era.     

FEATURES OF Pb ISOTOPIC COMPOSITION OF ORES AND EVOLUTION OF CONTINENTAL CRUST OF CHINA

Based on the Pb isotopic features, the ore leads in the continent of China can be dividedinto four types: (i) single-stage lead of low μ value derived from mantle, (ii) homogeneouslead of crustal source with high μ value, (iii) modern mixing lead between mantle andcrust, and (iv) residual lead of crustal source. As the leads from mantle had possessed single-stage features (μ = 7.8) before the Proterozoic, the ages of continental crust can be calculatedbased on the mixing Pb of type (iii). The results hidicate that the continental crust of Chinawas mainly generated during the Archaean, and the growth rates of crust reached the max-ima by the ages of 3.3-3.4, 2.6 and 1.6-1.7 b.y. The occurrences of residual crust Pbwith high ~(207)Pb/~(204)Pb and ~(208)Pb/~(204)Pb anomalies were associated with the remelting andreconstruction of crust since 1.6 b.y. ago. The lead sources in the continent of China showhigher Th/U ratios (3.3-6.5) and ~(207)Pb anomalies than those in other continents, indicationthe conti     

SIMULATION OF THE SEISMIC TECTONIC STRESS FIELD IN NORTH CHINA

The paper reviews several methods of simulation used in this country to recover currenttectonic stress field related to earthquake occurrence in North China. The aim is to evaluatethe degree of seismic risk around Beijing area. The methods used are computational ormathematical simulation by the finite element method and experimental or physical simulationby the photoelastic method and the grid method. The results obtained by these methods arebriefly described. Most simulations indicate that Beijing is not a region of seismic risk.     

GEOCHEMISTRY OF TRACE ELEMENTS IN DEEP-SEA SEDIMENTS OF THE SOUTH CHINA SEA

Mathematical-geological studies of trace elements in deep-sea sediments of the South China Sea have been made on the basis of the information developed from Q-factor analysis. The factors controlling the trace element distribution appear to be (ⅰ) sedimentary facies related to water depth and submarine volcanism, and (ⅱ) authigenous precipitation associated with chemical or biochemical process. The characteristics of migration and concentration of trace elements are described as follows: (ⅰ) The elements Ni, Cu and Co are probably related to the adsorption of autMgenous colloidal Mn-solids; (ⅱ) some elements, such as B, Cr, Zr and Ti are largely adsorbed on clay minerals; (ⅲ) both Sr and Ca are of biogeneous enrichment; (ⅳ) Ba intergrows with Cu, Pb and Ag, indicating that Ba results mainly from submarine volcanic activity and partly from biological process.     

DISTRIBUTION REGULARITY OF SEDIMENTARY TYPES OF NORTHEASTERN PART OF THE SOUTH CHINA SEA

Based on grain size types of the sediments, combined with characteristics of organism, mineral and chemical composition of the sediments, and a comprehensive analysis from the viewpoint of the origin of sediments, sediments in the region studied are classified into four sedimentary types, namely, terrigenous detritus (including five zones of sediments), biogenic-terrigcnous (including three zones of sediments), authigenous-terrigenous (containing some authigenic scdimentary minerals) and volcanic-terrigenous (containing certain volcanic detritus) types. Characteristics of all these types, their relationships and spatial distributions are also discussed.     

STUDIES ON SEDIMENTATION RATE OF CONTINENTAL SLOPE OF THE SOUTH CHINA SEA

Sedimentation rate of sediments on the continental slope of the South China Sea has been determined by the Th_(ex)~(230) method. Results show that in the upper part of the core from the surface layer down to 48 cm there might have occurred a downslope, reflecting a discontinuous depositional process and palaeoclimate becoming warmer; in the middle section of the core the activities of Th_(ex)~(230) show an exponential decrease with increasing depths and depoaitional rate is 1.6mm/1000 years, and sediments might have been formed in a cold and deep-water environment: in the core from 90cm downward there might have been an active sedimentary environment with a warmer palaeoclimate.Based on the contents of U and Th, U/Th ratios and their relationships with Fe, Mn, Corg and P in all layers of the core, it is inferred that materials of the studied waters are mainly of terrestrial phase with a portion of authigenous constituents.     

CONCENTRATION, SOURCE OF MANGANESE AND IRON IN FERROMANGANESE NODULES AND THE RELATIONSHIP BETWEEN NODULES AND SEDIMENTARY ENVIRONMENTS IN NORTH PACIFIC REGION

The concentration, source of manganese and iron in ferromanganese nodules and therelation between nodules and sedimentary environments are discussed in detail by asynthetical study on chemical information of ferromanganese nodules and correspondingsediment, pore water and geological, biological (bacteria) information in 26 stations fromthe North Pacific region (7- 13°N, 178- 165°W). The result shows that (i) the concen-tration and distribution characteristics of magnese and iron in ferromanganese nod-ules differ in different types of nodules, however, the concentration decreases with theincrease in grain sizes of nodules; (ii) the source of iron in different types of nodulesis basically the same, i. e. the slow sedimentation of overlying water; (iii) manganesein nodules comes mainly from the diffusion of Mn~(2+) in the pore water, and Mn~(2+) fromthe reduction of Mn~(4+) in sediments by the medium of bacteria. As the distribution of bac-teria is believed to be strongly affected by the sedimentary envi     

COMPARATIVE RESEARCH ON ENVIRONMENTAL EVOLUTION BETWEEN THE RECION OF ANTARCTIC GREAT WALL STATION AND CHINA

Through comparative analysis between the environmental changes in the region of KingGeorge Island in Antarctic and the characteristics of environmental evolution in the differentregions of China, the paper reveals the important similarity of the environmental evolutionbetween the two regions. The fine correspondence relations between the environmentalchanges of King George Island region in Antarctic, the glacial activities on the mountainousterrain in the western part of China, and the oscillation of the northern boundary of sub-tropical zone in the eastern part of China pointed out in this study serve as evidence to sup-port the interaction between the Northern and Southern Hemispheres. The uniformity of theclimatic changes of the King George Island region in Antarctic with the changes of sea levelof China and the world also supports the similarity of the trend of global changes in tem-perature since the Holocene. One must pay attention to the macroscopic and integrated studyof the whole earth in order     

STUDIES ON THE MECHANISM OF INDIRUBIN ACTION IN THE TREATMENT OF CHRONIC GRANULOCYTIC LEUKEMIA——V.BINDING BETWEEN INDIRUBIN AND DNA AND IDENTIFICATION OF THE TYPE OF BINDING

The binding between indirubin and calf thymus DNA in vitro has been verified by meansof the isotope labelling method, spectrophotometric method and thermal denaturation meas-urements. The λ_max 207 nm of indirubin shifted toward longer wave length with decrease ofabsorbance after the incubation of indirubin with DNA. The escalation of Tm value of DNAinduced by indirubin was about 2.4°C and it was reproducible. The binding force between themwas rather weak, as indirubin molecules were easily released during the precipitation withalcohol or the gel filtration. The binding was not affected by sodium chloride even at high con-centration but greatly decreased (to 20-30% of the control) in the presence of 8 M urea.These results showed that the binding between indirubin and DNA might be of hydrogen bondrather than ionic. The amount of bound ~3H-indirubin was directly proportional to the con-centration of indirubin. However, it increased abruptly when the concentration of indirubinreached 1.5×10~(-4) M. This     

ISOLATION AND STRUCTURE ELUCIDATION OF A NOVEL STEROL FROM THE SOUTH CHINA SEA SPONGE DYSIDEA SP.

A novel and unusual sterol with unsaturation in the△~(5(14))position,5α-cholesta-8(14),24(25)-diene-3β,6α-diol 1,was isolated fromthe South China Ses sponge Dysidea sp.The structure and relativestereochemistry of 1 was established by spectral analysis and comparison to thespectral data of known sterols.     

REACTIONS BETWEEN BORIC ACID AND POLYHYDROXY COMPOUNDS AND THE DEVELOPMENTS OF BORON—SELECTIVE RESINS

A Review with 56 references on the reaction between boric acid and polyhydroxy compounds,and the developments of boron-selective resins.     

THE ALTITUDE AND LATITUDE EFFECTS OF H-O ISOTOPIC SYSTEM IN GRANITOID ROCKS

A lot of Mesozoic and Cenozoic granitoid rocks are widely distributed along the east coastalregion and in the southern part of Xizang, China. In order to study the altitude and latitude effect ofH-O isotopic system in these granitoid rocks, we have first studied the altitude and latitude effects ofδ~(18)O, δD values of recent meteoric water. The altitude and latitude effect equations of recent meteoricteoric water were established. The altitude effects of δD vaues for hydroxyl minerals from granitoid rocks inLhasa-Yadong region of Xizang were found. The average elevated rate of Xizang Plateau is 0.1 mm/yr.The δ~(18)O and δD values of whole rock samples for late Yanshanian miarolitic granite in the east coastalregion wete progressively lower as a function of latitude. The negative correlation between δ~(18)O and δDvalues in each miarolitic pluton represents the relationship between δ~(18)O, δD values of rocks or mineralsand temperatures in the condition with the same ω/r ratio in the interactiv     

STUDY OF THE REACTION BETWEEN α-KETOTHIOANILIDE AND PHENYLENE DIAMINE

When α-ketothioanilide reacts with o-phenylenediamine,there aretwo competing reactions.One is condensation which forms substituted quinoxalineand the other is substitution which forms substituted quinoxaline-2-thione·Bycontrolling the reaction condition,we can obtain either quinoxaline orquinoxaline-2-thione as the main product.     

STRUCTURES OF CRUST AND UPPER MANTLE AND THEIR RELATION TO CENOZOIC TECTONISM IN NORTHERN PART OF NORTH CHINA

On the basis of deep seismic profiling carried out in the past six years, the velocity, gcoelectrical and geothermal structures of the crust and upper mantle and tectonic frames of the Moho discontinuity and asthenosphere have been determined for the northern part of North China. A close relationship exists between Cenozoic teetonism and the geodynamic processes in the crust and upper mantle. We surmise that the intense inhomogeneous activities of the asthenospherc between the late Cretaceous and the Cenozoic may have given rise to the following processes: lithospheric breakup, basalt eruptions, increase in geothermal gradient, lower crustal creep, upper crustal spreading, subsidence and the accumulation of sedimentary deposits as well as the development of shallow-level normal faults. The dip angles of such faults gradually decrease with depth and thus disappear in the low velocity layer of the crust.     

A STUDY ON THE RECEPTIVE FIELD OF ACUPOINTS AND THE RELATIONSHIP BETWEEN CHARACTERISTICS OF NEEDLING SENSATION AND GROUPS OF AFFERENT FIBRES

We have recorded the afferent unit discharges and using it as an index, measured the locations and the volumes of nine acupoints, such as Neiguan and Shaoshang, which are innervated by median nerve. We have also investigated. the relationships between electric needling sensations and afferent fibres of different groups as well as manual needling sensations by means of analysing power-spectrum of the unit discharges with FFT. It has been found that the fibres of Group Ⅱ and Group Ⅳ convey numbness and soreness, respectively. The fibres of Group Ⅲ relates to the conduction of heaviness and distention closely.