The Middle-Lower Yangtze River Metallogenic Belt(MLYMB) is an important mineral resource region in China.High-resolution crustal models can provide crucial constraints to understand the ore-forming processes and geody...The Middle-Lower Yangtze River Metallogenic Belt(MLYMB) is an important mineral resource region in China.High-resolution crustal models can provide crucial constraints to understand the ore-forming processes and geodynamic setting in this region. Using ambient seismic noise from 107 permanent and 82 portable stations in the MLYMB and the adjacent area,we present a new high-resolution 3D S-wave velocity model of this region. We first extract 5–50 s Rayleigh wave phase velocity dispersion data by calculating ambient noise cross-correlation functions(CFs) and then use the surface wave direct inversion method to invert the mixed path travel times for the 3D S-wave velocity structure. Checkerboard tests show that the horizontal resolution of the 3D S-wave velocity model is approximately 0.5°–1.0° and that the vertical resolution decreases with increasing noise and depth. Our high-resolution 3D S-wave velocity model reveals:(1) AV-shaped high-velocity zone(HVZ) is located in the lower crust and the uppermost mantle in the study region. The western branch of the HVZ passes through the Jianghan Basin,the Qinling-Dabie orogenic belt and the Nanxiang Basin. The eastern branch, which almost completely covers the main body of the MLYMB, is located near the Tanlu Fault. The low-velocity anomalies between the western and eastern branches are located in the area of the Qinling-Dabie orogenic belt.(2) High-velocity uplifts(HVUs) are common in the crust of the MLYMB,especially in the areas near the Tanlu Fault, the Changjiang Fault and the Yangxin-Changzhou Fault. The intensities of the HVUs gradually weaken from west to east. The V-shaped HVZ in the lower crust and uppermost mantle and the HVUs in the middle and lower crust likely represent cooled mantle intrusive rocks. During the Yanshanian period, fault systems formed in the MLYMB due to the convergence between the South China Plate and the North China Plate, the multiple-direction drifting of the PaleoPacific Plate and its subduction beneath the Eurasian Plate. The deh展开更多
Based on the results of two dimension velo city structure, 1∶100 000 aeromagnetic anomaly, 1∶200 000 bouguer gravity anom aly and seismic anisotropy of Jiaodong and neighboring region in Shandong, China , the info...Based on the results of two dimension velo city structure, 1∶100 000 aeromagnetic anomaly, 1∶200 000 bouguer gravity anom aly and seismic anisotropy of Jiaodong and neighboring region in Shandong, China , the information of geophysical field was divided into two parts: deep and sh allow focus fields. And then, the information of two different fields was c ombined with that of deep seated geology and ore deposit features. The syntheti c result was adopted to analyze three dimension structure, to probe into crust mantle coupling effects of mineralization and dynamics of ore formation system .展开更多
That more than 82 percent of proved sandstone-type uranium deposits coexist with proved oil-gas or coalfields in the world reflects the fact of coexistence and accumulation of multi-energy minerals including oil,gas,c...That more than 82 percent of proved sandstone-type uranium deposits coexist with proved oil-gas or coalfields in the world reflects the fact of coexistence and accumulation of multi-energy minerals including oil,gas,coal and uranium in the same basin.Especially,this phenomenon is most typical in the Central-east Asia energy basins.Across China,Mongolia and some central Asian countries,the giant Central-east Asia metallogenetic domain(CEAMD)stretches more than 6,000 km from Songliao Basin of China in the east to the Caspian Sea in the west.The multi-energy minerals distribution characteristics of the domain include:their spatial distribution is complicated and ordered;the ore-bearing horizon relates closely to the geographical region;the accumulation/mineralization and localization time is the same or close;the occurrence setting and accumulation/mineralization have close correlation;and they have rich provenance for all the minerals.All of these imply that they have close relations between each other under a unified geodynamic background.The exogenetic uranium mineralization process in CEAMD can be divided into five phases using time limits of 100 Ma,(50±2)Ma,20±(2―4)Ma,8―5 Ma.The major mineralization periods and their differences in each primary uranium-bearing basin are identical to the oil-gas accumulation and localization periods and phases in the same basin,and are also in response to regional tectonics and controlled in general by the regional geodynamic environment.For industrial application and commercial exploitation,it is suggested that an important period for coexistence,accumulation and localization of oil,gas,coal and uranium and their interaction mainly occur in the late/last and post basin evolution.Through generalized analysis and comparison of accumulation/mineralization environment of the energy basins in CEAMD,the authors propose that the relatively stable regional tectonic background and moderate(weaker)structural deformation probably are necessary for formation,coexistence and preservat展开更多
Soil samples archived over four decades were used in an incubation experiment to measure the effects of reforestation on nitrogen dynamics in old agricultural fields. Samples collected from 0 to 7.5 cm and 35 to 60 cm...Soil samples archived over four decades were used in an incubation experiment to measure the effects of reforestation on nitrogen dynamics in old agricultural fields. Samples collected from 0 to 7.5 cm and 35 to 60 cm depths in Calhoun,South Carolina USA at intervals ranging between five and nine years since 1962 were incubated aerobically at 30 ℃ for 30 days using a system specially designed to maintain constant soil moisture. Mineral N was measured in 2 mol·L -1 KCl extracts. The ratio of mineralized N to total N rapidly decreased in the first two decades of forest development. Within 20 years after planting, plenty of available N had been accumulated in the biomass, which had a significant negative correlation with soil total N ( r - top -0.828～-0.898; r - deep-0.848～-0.989). It indicated that agricultural inputs of N were important to early tree development. Significantly, by age 40, soil mineral N had increased to 50%of that in the beginning of tree planting. The accretion of mineralizable N suggests that forest floor is serving as an increasingly important source for this nutrient. Further, it indicates that forest managers have the opportunity to manipulate a large pool of forest organic matter to sustain soil N supply.展开更多
基金supported by the Land Resources Survey Project of the China Geological Survey Bureau (Grant No. DD20179354)the National Natural Science Foundation of China (Grant Nos. 41790464 & 41674061)
文摘The Middle-Lower Yangtze River Metallogenic Belt(MLYMB) is an important mineral resource region in China.High-resolution crustal models can provide crucial constraints to understand the ore-forming processes and geodynamic setting in this region. Using ambient seismic noise from 107 permanent and 82 portable stations in the MLYMB and the adjacent area,we present a new high-resolution 3D S-wave velocity model of this region. We first extract 5–50 s Rayleigh wave phase velocity dispersion data by calculating ambient noise cross-correlation functions(CFs) and then use the surface wave direct inversion method to invert the mixed path travel times for the 3D S-wave velocity structure. Checkerboard tests show that the horizontal resolution of the 3D S-wave velocity model is approximately 0.5°–1.0° and that the vertical resolution decreases with increasing noise and depth. Our high-resolution 3D S-wave velocity model reveals:(1) AV-shaped high-velocity zone(HVZ) is located in the lower crust and the uppermost mantle in the study region. The western branch of the HVZ passes through the Jianghan Basin,the Qinling-Dabie orogenic belt and the Nanxiang Basin. The eastern branch, which almost completely covers the main body of the MLYMB, is located near the Tanlu Fault. The low-velocity anomalies between the western and eastern branches are located in the area of the Qinling-Dabie orogenic belt.(2) High-velocity uplifts(HVUs) are common in the crust of the MLYMB,especially in the areas near the Tanlu Fault, the Changjiang Fault and the Yangxin-Changzhou Fault. The intensities of the HVUs gradually weaken from west to east. The V-shaped HVZ in the lower crust and uppermost mantle and the HVUs in the middle and lower crust likely represent cooled mantle intrusive rocks. During the Yanshanian period, fault systems formed in the MLYMB due to the convergence between the South China Plate and the North China Plate, the multiple-direction drifting of the PaleoPacific Plate and its subduction beneath the Eurasian Plate. The deh
文摘Based on the results of two dimension velo city structure, 1∶100 000 aeromagnetic anomaly, 1∶200 000 bouguer gravity anom aly and seismic anisotropy of Jiaodong and neighboring region in Shandong, China , the information of geophysical field was divided into two parts: deep and sh allow focus fields. And then, the information of two different fields was c ombined with that of deep seated geology and ore deposit features. The syntheti c result was adopted to analyze three dimension structure, to probe into crust mantle coupling effects of mineralization and dynamics of ore formation system .
基金Jointly supported by the National Important Basic Research Program of China(Grant No.2003CB214607)Program for Changjiang Scholars and Innovative Research Team in University(Grant No.IRT0559)the National Natural Science Foundation of China(Grant No.40372096)
文摘That more than 82 percent of proved sandstone-type uranium deposits coexist with proved oil-gas or coalfields in the world reflects the fact of coexistence and accumulation of multi-energy minerals including oil,gas,coal and uranium in the same basin.Especially,this phenomenon is most typical in the Central-east Asia energy basins.Across China,Mongolia and some central Asian countries,the giant Central-east Asia metallogenetic domain(CEAMD)stretches more than 6,000 km from Songliao Basin of China in the east to the Caspian Sea in the west.The multi-energy minerals distribution characteristics of the domain include:their spatial distribution is complicated and ordered;the ore-bearing horizon relates closely to the geographical region;the accumulation/mineralization and localization time is the same or close;the occurrence setting and accumulation/mineralization have close correlation;and they have rich provenance for all the minerals.All of these imply that they have close relations between each other under a unified geodynamic background.The exogenetic uranium mineralization process in CEAMD can be divided into five phases using time limits of 100 Ma,(50±2)Ma,20±(2―4)Ma,8―5 Ma.The major mineralization periods and their differences in each primary uranium-bearing basin are identical to the oil-gas accumulation and localization periods and phases in the same basin,and are also in response to regional tectonics and controlled in general by the regional geodynamic environment.For industrial application and commercial exploitation,it is suggested that an important period for coexistence,accumulation and localization of oil,gas,coal and uranium and their interaction mainly occur in the late/last and post basin evolution.Through generalized analysis and comparison of accumulation/mineralization environment of the energy basins in CEAMD,the authors propose that the relatively stable regional tectonic background and moderate(weaker)structural deformation probably are necessary for formation,coexistence and preservat
文摘Soil samples archived over four decades were used in an incubation experiment to measure the effects of reforestation on nitrogen dynamics in old agricultural fields. Samples collected from 0 to 7.5 cm and 35 to 60 cm depths in Calhoun,South Carolina USA at intervals ranging between five and nine years since 1962 were incubated aerobically at 30 ℃ for 30 days using a system specially designed to maintain constant soil moisture. Mineral N was measured in 2 mol·L -1 KCl extracts. The ratio of mineralized N to total N rapidly decreased in the first two decades of forest development. Within 20 years after planting, plenty of available N had been accumulated in the biomass, which had a significant negative correlation with soil total N ( r - top -0.828～-0.898; r - deep-0.848～-0.989). It indicated that agricultural inputs of N were important to early tree development. Significantly, by age 40, soil mineral N had increased to 50%of that in the beginning of tree planting. The accretion of mineralizable N suggests that forest floor is serving as an increasingly important source for this nutrient. Further, it indicates that forest managers have the opportunity to manipulate a large pool of forest organic matter to sustain soil N supply.
