1 Introduction The Lehonglead-zincdeposit is a large-sized Pb-Zn depositnewly found in recent years in the Sichuan-Yunnan-Guizhou Lead-zinc Poly-metallic Mineralization Area,which occurrenceis strictly
1 Introduction The large clusters of Zn-Pb deposits in northeastern Yunnan,located in the southwestern margin of the Yangtze Block,are an important part of the Sichuan-YunnanGuizhou Pb-Zn Poly-metallic Metallogenic Tr...1 Introduction The large clusters of Zn-Pb deposits in northeastern Yunnan,located in the southwestern margin of the Yangtze Block,are an important part of the Sichuan-YunnanGuizhou Pb-Zn Poly-metallic Metallogenic Triangle Area展开更多
[Objective] The aim was to explore adaptability of degradable mulches in maize production in northeastern Yunnan. [Method] The tests of sun drying, burying and maize mulching were conducted based on 15 controllable de...[Objective] The aim was to explore adaptability of degradable mulches in maize production in northeastern Yunnan. [Method] The tests of sun drying, burying and maize mulching were conducted based on 15 controllable degradable mulches in northeastern Yunnan. [Result] Of the test mulches, the induction period last the longest of 56 d, and the induction period can not be well controlled. Besides, the degradable mulches proved similar with common mulches in terms of heat preser- vation and yield increasing for crops, and performed excellently in covering strength, extension degree and toughness. Additionally, degradable mulches left few residues after maize harvesting, which would remove mulch pollution. [Conclusion] The biodegradable mulch functions well in heat preservation and yield increasing, as well as resolving the issue of plastic pollution, which is of great significance in environ- ment protection, agricultural sustainable development, and eco-agriculture, green agri- culture and modernized agriculture.展开更多
Sr isotope geochemical studies (the87Sr/86Sr and δ18O-87Sr/86Sr systems) on the wall rocks and ores from the Lemachang independent Ag deposit in northeastern Yunnan provide strong evidence that the ore-forming fluids...Sr isotope geochemical studies (the87Sr/86Sr and δ18O-87Sr/86Sr systems) on the wall rocks and ores from the Lemachang independent Ag deposit in northeastern Yunnan provide strong evidence that the ore-forming fluids had flown through radiogenetically Sr-enriched rocks or strata prior to their entry into the locus of ore precipitation, and water-rock interaction is the main mechanism of Ag ore precipitation. The radiogenetically Sr-enriched source region may be the Proterozoic basement (the Kunyang and Hekou groups). Moreover, the theoretical modeling of the Sr isotopic system indicates that the ore-forming fluids contain as much as 3×10-6 Sr with isotopic composition of Sr being 0.750 and that of oxygen 7.0‰ The ore-forming temperatures were estimated at 150–250°C for the carbonate rock-type ores and at 200–260°C for the clastic rock-type.展开更多
基金supported by the Funds for the programs of the National Natural Science Foundation (Noes. 41572060, U1133602)Projects of YM Lab (2011)Innovation Team of Yunnan province and KMUST (2008,2012)
文摘1 Introduction The Lehonglead-zincdeposit is a large-sized Pb-Zn depositnewly found in recent years in the Sichuan-Yunnan-Guizhou Lead-zinc Poly-metallic Mineralization Area,which occurrenceis strictly
基金supported by the Funds for the program of the National Natural Science Foundation (Noes. 41572060, U1133602)Projects of YM Lab (2011)Innovation Team of Yunnan province and KMUST (2008,2012)
文摘1 Introduction The large clusters of Zn-Pb deposits in northeastern Yunnan,located in the southwestern margin of the Yangtze Block,are an important part of the Sichuan-YunnanGuizhou Pb-Zn Poly-metallic Metallogenic Triangle Area
基金Supported by the Earmarked Fund for Modern Agro-industry Technology Research System(CARS-02-79)Special Fund for Agro-scientific Research in the Public Interest(20150312710)~~
文摘[Objective] The aim was to explore adaptability of degradable mulches in maize production in northeastern Yunnan. [Method] The tests of sun drying, burying and maize mulching were conducted based on 15 controllable degradable mulches in northeastern Yunnan. [Result] Of the test mulches, the induction period last the longest of 56 d, and the induction period can not be well controlled. Besides, the degradable mulches proved similar with common mulches in terms of heat preser- vation and yield increasing for crops, and performed excellently in covering strength, extension degree and toughness. Additionally, degradable mulches left few residues after maize harvesting, which would remove mulch pollution. [Conclusion] The biodegradable mulch functions well in heat preservation and yield increasing, as well as resolving the issue of plastic pollution, which is of great significance in environ- ment protection, agricultural sustainable development, and eco-agriculture, green agri- culture and modernized agriculture.
文摘Sr isotope geochemical studies (the87Sr/86Sr and δ18O-87Sr/86Sr systems) on the wall rocks and ores from the Lemachang independent Ag deposit in northeastern Yunnan provide strong evidence that the ore-forming fluids had flown through radiogenetically Sr-enriched rocks or strata prior to their entry into the locus of ore precipitation, and water-rock interaction is the main mechanism of Ag ore precipitation. The radiogenetically Sr-enriched source region may be the Proterozoic basement (the Kunyang and Hekou groups). Moreover, the theoretical modeling of the Sr isotopic system indicates that the ore-forming fluids contain as much as 3×10-6 Sr with isotopic composition of Sr being 0.750 and that of oxygen 7.0‰ The ore-forming temperatures were estimated at 150–250°C for the carbonate rock-type ores and at 200–260°C for the clastic rock-type.
