In order to study the age, geochemical characteristics and tectonic genesis of the ore-bearing intrusions of Dasuji porphyry Mo deposit, three kinds of rock samples of quartz porphyry, syenogranite and granite porphyry that are related to molybdenum mineralization were collected from the deposit. Zircon U-Pb dating reveals that the ages of quartz porphyry, granite porphyry and syenogranite are 231, 227 and 225 Ma, respectively. Characteristics of major and trace elements indicate that they belong to high-K calc-alkaline to shoshonite series and highly fractionated I-type granite. Geochemistry of the rock associations, integrated with regional geology indicate that Dasuji area was in extension during Indosinian. The upwelling of asthenosphere triggered partial melting of crust in a wide range of depth. Magma related to this deposit was generated in this process. During ascending, the magma extracted ore elements from protore which had collected ore elements in the pre-Mesozoic during multiple geological activities and the magma became more enriched in Mo due to the extensive crystal fractionation. When volatiles in magma were supersaturated, ore-forming fluid was separated from melt with Mo. Ore minerals were mainly precipitated with quartz and filled in the fractures during the boiling process.
Utilizing land cover change (LCC) information together with MODIS land surface temperature in Jing-Jin-Ji area in 2000, 2005 and 2010, spatiotemporal difference of urban heat island (UHI) effects and the factors influenced UHI is explored. Results reveal that the seasonal fluctuations of daytime UHI is bigger than that of nighttime UHI. More than 92.8% of the urban have UHI in the nighttime every season. The strongest daytime UHI happens in summer, but more than 85% of the cities have urban cooling effect in winter. The nighttime UHI in different seasons appear to be similar. The water in urban has different influence to UHI in daytime and nighttime which is to weaken the UHI and to enhance the UHI. The grass in urban enhance the UHI in the daytime of spring and summer and in the nighttime of all seasons but weaken the UHI in the daytime of winter. The forest and the crop land in the urban have the same effect which are weaken the UHI in the daytime of spring, summer and autumn and in the nighttime of all seasons but enhance the UHI in the daytime of winter.
This paper focuses on the influence external economies of scale brought by industrial agglomeration and internal economies of scale brought by industrial organization have on pollution emission intensity. This research takes SO2, soot, polluted water as the examples and two digits manufacturing industrial divisions as the research subjects. Through spatial distribution analysis and penal data econometric analysis during the time from 2005 to 2009, the authors find that the relationship between gini and pollution intensity is positive, state owned and group owned enterprises ratios are negative related to pollution intensity of SO2 and soot, while private and foreign investment enterprises ratios are positive related to pollution intensity. The result shows that industrial pollution is influenced by the trend of marketization, which suggests that the authority may improve the environmental regulations systems and the supervision power, and local government should improve the pollution dissolving facilities’ effectiveness and pollution control efforts within industrial clusters.
