This work makes the quantitative constrain on tectonizations of the Gangdese block, south Qinghai-Tibetan Plateau. Apatite fission track (AFT) dating analyses of 15 samples collected across the Gangdese block show tha...This work makes the quantitative constrain on tectonizations of the Gangdese block, south Qinghai-Tibetan Plateau. Apatite fission track (AFT) dating analyses of 15 samples collected across the Gangdese block show that the Gangdese block went through two periods of tectonizations, during -37.2-18.5 Ma and 18.5 - 8.0 Ma in the south Gangdese block, and during -47.6-5.3 Ma and 5.3-0 Ma in the middle Gangdese block. Different upliftings did not take place in the first period and rapid uplifting occurred in the late period. Meantime, there are some differences be-tween the south and middle Gangdese block. Their uplifting rate is 180 m/Ma and 70 m/Ma respectively. The rapid up-lifting time in the middle Gangdese block lagged behind the time in the south Gangdese block. It is Chala-Jiacuo-Riduo fault zone that is similar to the Yarlung Zangbo fault zone in control of the tectonization.展开更多
The dating of the uplift onset of the Huangshan pluton in the southern part of Anhui Province associated with the collision between paleo-Pacific Block and the Eurasian Block is a fundamental issue to better understan...The dating of the uplift onset of the Huangshan pluton in the southern part of Anhui Province associated with the collision between paleo-Pacific Block and the Eurasian Block is a fundamental issue to better understand the uplift mechanisms and the regional tectonic evolution. Х^2 values of seven zircon fission track （ZFF） samples collected from the south part of the Huangshan pluton were all 〈5%. Based on the grain ages of four typical ZFr samples, three thermal overprints ranging in 113-123, 72-95 and 49-66 Ma were distinguished respectively using the binomial peak-fitting method in accordance with the tectonic thermal events after south China shifted into circum-Pacific tectonic region. Apatite fission track （AFT） study of the Huangshan pluton shows ages lie between 15±3 and 56±6 Ma with all Х^2 values 〉5%, and all are significantly younger than their host rock formation ages, indicating that the samples have experienced post-formation thermal history. Based on the AFT resuits and topography characteristics in the Huangshan pluton, three zones with different denudation intensities caused by the differential uplift of the fault blocks were recognized in this paper, indicating that denudation was driven by the increase in elevation significantly. Modeling of the AFT data shows that the earlier cooling phase took place in the early Cenozoic and involved 3.3, 3.8 and 6.0℃/Ma of cooling rates equivalent to the exhumation rates of 90, 104 and 167 m/Ma in different fault blocks. The last phase of cooling took place from -10 Ma with average cooling rate of -5.6℃/Ma, equivalent to average denudation rates of -156 m/Ma. The fission track results imply that the regional compression field plays an important role for the differential exhumation between individual fault blocks of the Huangshan pluton.展开更多
As an energy-free cooling technique,radiative cooling has garnered significant attention in the field of energy conservation.However,traditional radiative cooling films often possess static optical properties and thei...As an energy-free cooling technique,radiative cooling has garnered significant attention in the field of energy conservation.However,traditional radiative cooling films often possess static optical properties and their inherent opacity limits their applications in building such as windows.Therefore,there exists a requirement for passive radiative cooling films endowed with adjustable transmittance.Here we report the porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling.In a result,the film exhibited a high solar reflectance(0.3-2.5μm)of 96.9%and a high infrared emittance(8-13μm)of 97.9%.Outdoor experiments demonstrated that the film surface temperature was 6.6℃lower than ambient temperature,with a cooling power of 104.8 W·m^(-2).In addition,the film’s transmittance can be regulated by altering the polarity of the post-processing solvent,providing an effective approach for regulating indoor light intensity and thermal balance,thereby enhancing the applicability of radiative cooling.展开更多
In order to study the cooling mechanism of embankment with block stone interlayer under open and closed conditions, an experimental railway section was built and data within one freeze-thaw cycle were collected. The r...In order to study the cooling mechanism of embankment with block stone interlayer under open and closed conditions, an experimental railway section was built and data within one freeze-thaw cycle were collected. The results explain well the cooling mechanism of embankment with block stone interlayer. Under the open condition in cold seasons, the enforced convection effect occurs within block stone interlayer when the wind speed is large; however, the weak air convection occurs within the block stone interlayer near the bottom of the embankment when the wind speed is slow. Under the open condition in warm seasons, heat conduction occurs within block stone interlayer due to the change in wind speed and direction. Under the closed condition, however, the enforced convection within block stone interlayer is so weak that heat conduction is dominant in the whole year because wind is blocked. Therefore, the cooling effect of embankment with a block stone interlayer to the soil beneath it is produced by enforced convection and weak free air convection; both its process and the cooling intensity are controlled by the local wind speed and direction. Because of the difference in the cooling effects, the soil temperature beneath the embankment has a temperature difference of 2°C–4°C between the open and closed conditions.展开更多
基金This work was supported by the President Fund of the Chinese Academy of Sciences (CAS) (Grant No. 99-775) the National Natural Science Foundation of China (Grant No. 40072068) Laboratory of Nuclear Analysis Technique, the CAS.
文摘This work makes the quantitative constrain on tectonizations of the Gangdese block, south Qinghai-Tibetan Plateau. Apatite fission track (AFT) dating analyses of 15 samples collected across the Gangdese block show that the Gangdese block went through two periods of tectonizations, during -37.2-18.5 Ma and 18.5 - 8.0 Ma in the south Gangdese block, and during -47.6-5.3 Ma and 5.3-0 Ma in the middle Gangdese block. Different upliftings did not take place in the first period and rapid uplifting occurred in the late period. Meantime, there are some differences be-tween the south and middle Gangdese block. Their uplifting rate is 180 m/Ma and 70 m/Ma respectively. The rapid up-lifting time in the middle Gangdese block lagged behind the time in the south Gangdese block. It is Chala-Jiacuo-Riduo fault zone that is similar to the Yarlung Zangbo fault zone in control of the tectonization.
基金supported by National Natural Science Foundation of China(Grant Nos.40772134)Open Research Program of the State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(Grant No.200643)
文摘The dating of the uplift onset of the Huangshan pluton in the southern part of Anhui Province associated with the collision between paleo-Pacific Block and the Eurasian Block is a fundamental issue to better understand the uplift mechanisms and the regional tectonic evolution. Х^2 values of seven zircon fission track （ZFF） samples collected from the south part of the Huangshan pluton were all 〈5%. Based on the grain ages of four typical ZFr samples, three thermal overprints ranging in 113-123, 72-95 and 49-66 Ma were distinguished respectively using the binomial peak-fitting method in accordance with the tectonic thermal events after south China shifted into circum-Pacific tectonic region. Apatite fission track （AFT） study of the Huangshan pluton shows ages lie between 15±3 and 56±6 Ma with all Х^2 values 〉5%, and all are significantly younger than their host rock formation ages, indicating that the samples have experienced post-formation thermal history. Based on the AFT resuits and topography characteristics in the Huangshan pluton, three zones with different denudation intensities caused by the differential uplift of the fault blocks were recognized in this paper, indicating that denudation was driven by the increase in elevation significantly. Modeling of the AFT data shows that the earlier cooling phase took place in the early Cenozoic and involved 3.3, 3.8 and 6.0℃/Ma of cooling rates equivalent to the exhumation rates of 90, 104 and 167 m/Ma in different fault blocks. The last phase of cooling took place from -10 Ma with average cooling rate of -5.6℃/Ma, equivalent to average denudation rates of -156 m/Ma. The fission track results imply that the regional compression field plays an important role for the differential exhumation between individual fault blocks of the Huangshan pluton.
基金supported by the National Natural Science Foundation of China(Nos.22161142021,22175010,and 22275183).
文摘As an energy-free cooling technique,radiative cooling has garnered significant attention in the field of energy conservation.However,traditional radiative cooling films often possess static optical properties and their inherent opacity limits their applications in building such as windows.Therefore,there exists a requirement for passive radiative cooling films endowed with adjustable transmittance.Here we report the porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling.In a result,the film exhibited a high solar reflectance(0.3-2.5μm)of 96.9%and a high infrared emittance(8-13μm)of 97.9%.Outdoor experiments demonstrated that the film surface temperature was 6.6℃lower than ambient temperature,with a cooling power of 104.8 W·m^(-2).In addition,the film’s transmittance can be regulated by altering the polarity of the post-processing solvent,providing an effective approach for regulating indoor light intensity and thermal balance,thereby enhancing the applicability of radiative cooling.
基金Supported by the Outstanding Youth Foundation Project, the National Natural Science Foundation of China (Grant No. 40625004)the National Basic Research Program "973 Program" (Grant No. 2002CB412704)
文摘In order to study the cooling mechanism of embankment with block stone interlayer under open and closed conditions, an experimental railway section was built and data within one freeze-thaw cycle were collected. The results explain well the cooling mechanism of embankment with block stone interlayer. Under the open condition in cold seasons, the enforced convection effect occurs within block stone interlayer when the wind speed is large; however, the weak air convection occurs within the block stone interlayer near the bottom of the embankment when the wind speed is slow. Under the open condition in warm seasons, heat conduction occurs within block stone interlayer due to the change in wind speed and direction. Under the closed condition, however, the enforced convection within block stone interlayer is so weak that heat conduction is dominant in the whole year because wind is blocked. Therefore, the cooling effect of embankment with a block stone interlayer to the soil beneath it is produced by enforced convection and weak free air convection; both its process and the cooling intensity are controlled by the local wind speed and direction. Because of the difference in the cooling effects, the soil temperature beneath the embankment has a temperature difference of 2°C–4°C between the open and closed conditions.
