Atmospheric O₂/N₂ measurements at two Japanese sites: estimation of global oceanic and land biotic carbon sinks and analysis of the variations in atmospheric potential oxygen (APO)     

YASUNORI TOHJIMA  HITOSHI MUKAI  YUKIHIRO NOJIRI  HIROAKI YAMAGISHI  TOSHINOBU MACHIDA 《Tellus. Series B, Chemical and physical meteorology》2008,60(2):213-225

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Evidence of earth catastrophe by anomalous shocked quartz at the K/T boundary     

YASUNORI MIURA  Toshio KATO  Masashi Imai 《Celestial Mechanics and Dynamical Astronomy》1992,54(1-3):249-253

Anomalous shocked quartz with high density (less than 1 % of density-deviation) is considered to be a relict of ultra high-pressure at meteoritic impact. The shocked quartz grains can be found only in terrestrial and artificial impact craters, meteorites and the Cretaceous-Tertiary (K/T) boundary samples. Volcanic activity is considered to be started or accelerated by enormous impact event.  相似文献   

An Experimentally Constrained Petrogenetic Grid in the Silica-Saturated Portion of the System KFMASH at High Temperatures and Pressures   总被引：4，自引：0，他引：4  

DAS  KAUSHIK; DASGUPTA  SOMNATH; MIURA  HIROYUKI 《Journal of Petrology》2003,44(6):1055-1075

Experiments in the quartz-saturated part of the system KFMASHunder fO₂ conditions of the haematite–magnetite bufferand using bulk compositions with X_Mg of 0·81, 0·72,0·53 define the stability limits of several mineral assemblageswithin the P–T field 9–12 kbar, 850–1100°C.The stability limits of the mineral assemblages orthopyroxene+ spinel + cordierite ± sapphirine, orthopyroxene + garnet+ sapphirine, sapphirine + cordierite + orthopyroxene and garnet+ orthopyroxene + spinel have been delineated on the basis ofP–T and T–X pseudosections. Sapphirine did not appearin the bulk composition of X_Mg = 0·53. A partial petrogeneticgrid applicable to high Mg–Al granulites metamorphosedat high fO₂, developed in our earlier work, was extended tohigher pressures. The experimental results were successfullyapplied to several high-grade terranes to estimate P–Tconditions and retrograde P–T trajectories. KEY WORDS: KFMASH equilibria; experimental petrogenetic grid at high fO₂  相似文献   

涨渡湖通江前后调蓄能力模拟分析     

李涛  吴胜军  蔡述明  薛怀平 《吉林大学学报(地球科学版)》2005,35(3):351-355

在RS/GIS的支持下,采用地形图扫描矢量化法构建涨渡湖区域的数字高程模型(DEM),将DEM模型与涨渡湖区2003年的LANDSAT-7 TM遥感图像进行叠加分析,提取出不同湿地类型的平均高程.通过回归分析,建立起水位、淹没面积、容积的关系模型.结合试验区的农情状况和水利设施的排涝能力,对比分析出通江前后涨渡湖地区调蓄能力的变化:通江前湖区最大调蓄面积为38.75 km2,最大调蓄容量为1.644亿 m3;通江后其最大可淹没面积为273 km2, 最大可调蓄容量为9亿 m3.  相似文献