2,3-disulfanylbutanedioic acid（DMSA） was found to be a selective depressant in the flotation separation of coppermolybdenum sulfides.The flotation results suggest that a low dosage of DMSA has a strong depression ef...2,3-disulfanylbutanedioic acid（DMSA） was found to be a selective depressant in the flotation separation of coppermolybdenum sulfides.The flotation results suggest that a low dosage of DMSA has a strong depression effect on chalcopyrite in the p H range between 4 and 12.At p H 6,the recoveries of molybdenum are up to 85%,75%,and 80% while those of chalcopyrite are 15%,5%,and 20% respectively when flotation tests are carried out with single minerals,mixed minerals and molybdenum-bearing copper concentrates.Adsorption isotherms measurement indicates that DMSA adsorbs more strongly on chalcopyrite than on molybdenite.The frontier orbital calculation reveals that the two S atoms of DMSA molecule are active centers for the adsorption of the DMSA molecule on chalcopyrite surface.Fermi level calculation shows that chalcopyrite can obtain electrons from the DMSA molecule while molybdenite cannot.展开更多
This paper discusses the enrichment and depletion regularities for porphyry coppermolybdenum ore deposits in different regions and varied deposit genetic types in the same area, taking three porphyry copper-molybdenum...This paper discusses the enrichment and depletion regularities for porphyry coppermolybdenum ore deposits in different regions and varied deposit genetic types in the same area, taking three porphyry copper-molybdenum ore deposits （i.e., the Chengmenshan in Jiangxi, Wunugetushan in Inner Mongolia, Baishantang in Gansu） and two copper deposits in Gansu Province （the Huitongshan skarn deposit and Gongpoquan composite deposit） as case studies. The results show that porphyry Cu-Mo deposits or skarn copper deposits include both enrichment of the ore-forming elements and associated elements, and depletion of some lithophile dispersed elements, rare earth elements （REE） and some major elements. And the depleted elements vary with deposits, having generality and their own features. On a deposit scale, the positive anomalies of enriched elements and negative anomalies of depleted elements follow in a sequence to comprise regular anomaly models of spatial structures. The exploration in the Tongchang deposit in Jiangxi and Huitongshan deposit in Gansu suggests that anomaly models play a key role in the identification of mineral occurrences and deposits compared to one single enriched element anomaly. And the anomaly models exert a critical effect on the optimization of prospecting targets and their potential evaluation.展开更多
The ore-controlling mechanism of the bedding fault system in the massive sulfide deposits of the Wushancopper orefield may be generalized as the control of ore deposition by optimum surface in an ore-formingstructural...The ore-controlling mechanism of the bedding fault system in the massive sulfide deposits of the Wushancopper orefield may be generalized as the control of ore deposition by optimum surface in an ore-formingstructural trap. The mechanism has three major features: (1) timing of mineralization; (2) positioning of hostformation; and (3) dependence of ore-controlling structure on properties of rocks. The 'optimum surface' is adivisional structural plane which marks obvious difference in physical, chemical and mechanical properties andis favorable for mineralization. It is also a unity of structures. lithofacies and orebodies. The structural and geochemical characteristics of the ore deposits indicate the migration trend of the ma-jor characteristic clements in the ore-controlling fault belt: elements with a small radius (Si, Fe, Mg and Al)moved towards and concentrated at the center of the belt while large-radius ones (Ca, K and Na) were remotefrom the center.展开更多
The Qulong deposit in Tibet is one of the largest porphyry copper-molybdenum deposits in China. We used short-wave infrared(SWIR) spectroscopy to examine the spectral characteristics of the extensively developed chlor...The Qulong deposit in Tibet is one of the largest porphyry copper-molybdenum deposits in China. We used short-wave infrared(SWIR) spectroscopy to examine the spectral characteristics of the extensively developed chlorite in this deposit. X-ray diffraction and electron microprobe analyses were used for phase identification and to obtain the chemical composition, ion substitution relationships, and formation environment of the chlorite. SWIR spectral parameters were applied to detect the hydrothermal centers. The results indicate that the wavelength of the absorption feature for Qulong chlorite Fe-OH(Pos2250) range from 2240 to 2268.4 nm;the chlorite substitution relationships are dominated by Mg-Fe substitution at the octahedral sites together with Al;-Si substitution at the tetrahedral sites;the chlorite formation temperatures range within the medium-low temperature hydrothermal alteration range from 164 to 281°C, with an average value of 264℃;the wavelength of the chlorite peak position for Fe-OH(2250 nm) absorption and its chemical composition are positively correlated with Al^(Ⅵ), Fe + Al^(Ⅵ), Fe/(Fe + Mg), Fe, and Fe + Al^(Ⅳ)but negatively correlated with Mg and Mg/(Fe + Mg);and the wavelength associated with the chlorite Fe-OH(2250 nm) absorption feature is positively correlated with the temperature at which the chlorite formed. These correlations indicate that more Fe and Al^(Ⅵ) ions and fewer Mg ions at the octahedral sites of chlorite lead to a longer the wavelength of the chlorite Fe-OH(2250 nm) absorption feature and a higher chlorite formation temperature. The wavelength of the Qulong chlorite Fe-OH(2250 nm) absorption feature(>2252 nm) can thus serve as an exploration indicator to guide the detection of hydrothermal centers in porphyry copper deposits. The results of the study indicate that the mineralogical and SWIR spectral characteristics of chlorite are significant indicators for locating hydrothermal centers within porphyry deposits.展开更多
Wushan crisp plum is a new cultivar of green crisp plum with dignified fruit shape,crisp and tender flesh,pit separability and sweet taste.It is bred from natural bud mutant of Jiang'an Dabaili,a local green crisp...Wushan crisp plum is a new cultivar of green crisp plum with dignified fruit shape,crisp and tender flesh,pit separability and sweet taste.It is bred from natural bud mutant of Jiang'an Dabaili,a local green crisp plum cultivar by Wushan County Fruit Industry Development Center,Southwest University and Chongqing Agricultural Technology Extension Station.Wushan crisp plum has won the gold award in the National High-quality Plum and Apricot Appraise and Elect and the tile of"the king of fruit"in the"Three-Gorge Cup"High-quality Crisp Plum Appraise and Elect.In the southwestern region of China,the planting area of Wushan crisp plum has been extended to 33000 ha.The cultivar has strong robust and fast growth.In the area along the Yangtze River in the Three Gorges Reservoir area of Chongqing,it ripens from early to middle July.The fruit is ovoid and of medium size,with average longitudinal diameter of 3.3 cm,average horizontal diameter of 4.0 cm,average single fruit mass of 37.2 g,carpopodium length of 1.5 cm,and carpopodium diameter of 0.1 cm.The top of the fruit is slightly concave.The peel is green to green-yellow in background color and medium in thickness,with obvious fruit dots and thick white fruit wax.The flesh is light yellow,compact,short in fiber length,juicy,crisp,tender,pure and sweet,with soluble solids content of 12%-15%,titratable acid content of 0.43%-0.72%and vitamin C content of 6.12-8.99 mg/100 g.The pit is small,separable,and oblate.The percentage of edible flesh is up to 94.80%-96.88%.There is no obvious pre-harvest cracking and intra-fruit pectin.The cultivar is mid-ripening and high in yield.In the firm ripe stage,the flesh is crunchy;and after entering the soft ripe stage,the flesh becomes powdery,and the hardness decreases.At room temperature,the fruit is not resistant to storage and transportation.Wushan crisp plum is tolerant to the climate with high temperature,high humidity and less sunshine,with good adaptability.It is suitable for promoting in the upper reaches of Yangtze River within 180-1000 m elevation.展开更多
基金Project(2012BAB01B03)supported by the National Key Technology Support Program of China
文摘2,3-disulfanylbutanedioic acid（DMSA） was found to be a selective depressant in the flotation separation of coppermolybdenum sulfides.The flotation results suggest that a low dosage of DMSA has a strong depression effect on chalcopyrite in the p H range between 4 and 12.At p H 6,the recoveries of molybdenum are up to 85%,75%,and 80% while those of chalcopyrite are 15%,5%,and 20% respectively when flotation tests are carried out with single minerals,mixed minerals and molybdenum-bearing copper concentrates.Adsorption isotherms measurement indicates that DMSA adsorbs more strongly on chalcopyrite than on molybdenite.The frontier orbital calculation reveals that the two S atoms of DMSA molecule are active centers for the adsorption of the DMSA molecule on chalcopyrite surface.Fermi level calculation shows that chalcopyrite can obtain electrons from the DMSA molecule while molybdenite cannot.
基金financially supported by the research special fund of public service sector from the Ministry of Land and Resources (No. 201111008)
文摘This paper discusses the enrichment and depletion regularities for porphyry coppermolybdenum ore deposits in different regions and varied deposit genetic types in the same area, taking three porphyry copper-molybdenum ore deposits （i.e., the Chengmenshan in Jiangxi, Wunugetushan in Inner Mongolia, Baishantang in Gansu） and two copper deposits in Gansu Province （the Huitongshan skarn deposit and Gongpoquan composite deposit） as case studies. The results show that porphyry Cu-Mo deposits or skarn copper deposits include both enrichment of the ore-forming elements and associated elements, and depletion of some lithophile dispersed elements, rare earth elements （REE） and some major elements. And the depleted elements vary with deposits, having generality and their own features. On a deposit scale, the positive anomalies of enriched elements and negative anomalies of depleted elements follow in a sequence to comprise regular anomaly models of spatial structures. The exploration in the Tongchang deposit in Jiangxi and Huitongshan deposit in Gansu suggests that anomaly models play a key role in the identification of mineral occurrences and deposits compared to one single enriched element anomaly. And the anomaly models exert a critical effect on the optimization of prospecting targets and their potential evaluation.
文摘The ore-controlling mechanism of the bedding fault system in the massive sulfide deposits of the Wushancopper orefield may be generalized as the control of ore deposition by optimum surface in an ore-formingstructural trap. The mechanism has three major features: (1) timing of mineralization; (2) positioning of hostformation; and (3) dependence of ore-controlling structure on properties of rocks. The 'optimum surface' is adivisional structural plane which marks obvious difference in physical, chemical and mechanical properties andis favorable for mineralization. It is also a unity of structures. lithofacies and orebodies. The structural and geochemical characteristics of the ore deposits indicate the migration trend of the ma-jor characteristic clements in the ore-controlling fault belt: elements with a small radius (Si, Fe, Mg and Al)moved towards and concentrated at the center of the belt while large-radius ones (Ca, K and Na) were remotefrom the center.
基金funded by Science and Technology Project of Tibet Autonomous Region(Grant Nos.XZ201801-GB-01XZ202102YD0024C)+2 种基金The Second Round of Comprehensive Investigation and Research on the Qinghai-Tibet Plateau(Grant No.2019QZKK0806)National Natural Science Foundation of China(Grant No.42002097)Demonstration Research on Alteration Mapping using Short-wave Infrared and Thermal Infrared Hyperspectral Technologies(Grant No.KK2102)。
文摘The Qulong deposit in Tibet is one of the largest porphyry copper-molybdenum deposits in China. We used short-wave infrared(SWIR) spectroscopy to examine the spectral characteristics of the extensively developed chlorite in this deposit. X-ray diffraction and electron microprobe analyses were used for phase identification and to obtain the chemical composition, ion substitution relationships, and formation environment of the chlorite. SWIR spectral parameters were applied to detect the hydrothermal centers. The results indicate that the wavelength of the absorption feature for Qulong chlorite Fe-OH(Pos2250) range from 2240 to 2268.4 nm;the chlorite substitution relationships are dominated by Mg-Fe substitution at the octahedral sites together with Al;-Si substitution at the tetrahedral sites;the chlorite formation temperatures range within the medium-low temperature hydrothermal alteration range from 164 to 281°C, with an average value of 264℃;the wavelength of the chlorite peak position for Fe-OH(2250 nm) absorption and its chemical composition are positively correlated with Al^(Ⅵ), Fe + Al^(Ⅵ), Fe/(Fe + Mg), Fe, and Fe + Al^(Ⅳ)but negatively correlated with Mg and Mg/(Fe + Mg);and the wavelength associated with the chlorite Fe-OH(2250 nm) absorption feature is positively correlated with the temperature at which the chlorite formed. These correlations indicate that more Fe and Al^(Ⅵ) ions and fewer Mg ions at the octahedral sites of chlorite lead to a longer the wavelength of the chlorite Fe-OH(2250 nm) absorption feature and a higher chlorite formation temperature. The wavelength of the Qulong chlorite Fe-OH(2250 nm) absorption feature(>2252 nm) can thus serve as an exploration indicator to guide the detection of hydrothermal centers in porphyry copper deposits. The results of the study indicate that the mineralogical and SWIR spectral characteristics of chlorite are significant indicators for locating hydrothermal centers within porphyry deposits.
基金National Guided Science and Technology Plan(2014GXS4D144)Wushan Crisp Plum New Variety Technology Integration Demonstration Project of Ministry of Science and Technology,China(2110402-9)Modern Efficient Industrial Technology System with Mountain Characteristics of Chongqing City(Late-ripening Citrus and Crisp Plum)(2015-01)。
文摘Wushan crisp plum is a new cultivar of green crisp plum with dignified fruit shape,crisp and tender flesh,pit separability and sweet taste.It is bred from natural bud mutant of Jiang'an Dabaili,a local green crisp plum cultivar by Wushan County Fruit Industry Development Center,Southwest University and Chongqing Agricultural Technology Extension Station.Wushan crisp plum has won the gold award in the National High-quality Plum and Apricot Appraise and Elect and the tile of"the king of fruit"in the"Three-Gorge Cup"High-quality Crisp Plum Appraise and Elect.In the southwestern region of China,the planting area of Wushan crisp plum has been extended to 33000 ha.The cultivar has strong robust and fast growth.In the area along the Yangtze River in the Three Gorges Reservoir area of Chongqing,it ripens from early to middle July.The fruit is ovoid and of medium size,with average longitudinal diameter of 3.3 cm,average horizontal diameter of 4.0 cm,average single fruit mass of 37.2 g,carpopodium length of 1.5 cm,and carpopodium diameter of 0.1 cm.The top of the fruit is slightly concave.The peel is green to green-yellow in background color and medium in thickness,with obvious fruit dots and thick white fruit wax.The flesh is light yellow,compact,short in fiber length,juicy,crisp,tender,pure and sweet,with soluble solids content of 12%-15%,titratable acid content of 0.43%-0.72%and vitamin C content of 6.12-8.99 mg/100 g.The pit is small,separable,and oblate.The percentage of edible flesh is up to 94.80%-96.88%.There is no obvious pre-harvest cracking and intra-fruit pectin.The cultivar is mid-ripening and high in yield.In the firm ripe stage,the flesh is crunchy;and after entering the soft ripe stage,the flesh becomes powdery,and the hardness decreases.At room temperature,the fruit is not resistant to storage and transportation.Wushan crisp plum is tolerant to the climate with high temperature,high humidity and less sunshine,with good adaptability.It is suitable for promoting in the upper reaches of Yangtze River within 180-1000 m elevation.
