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felsic rock mass；rare metal；non-ferrous metal；formation of rock；small rock mass 1

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Arsenic geochemistry of groundwater in Southeast Asia

Kyoung-Woong Kim, Penradee Chanpiwat, Hoang Thi Hanh, Kongkea Phan, Suthipong Sthiannopkao

Frontiers of Medicine 2011, Volume 5, Issue 4,   Pages 420-433 doi: 10.1007/s11684-011-0158-2

Abstract: The occurrence of high concentrations of arsenic in the groundwater of the Southeast Asia region has received much attention in the past decade. This study presents an overview of the arsenic contamination problems in Vietnam, Cambodia, Lao People’s Democratic Republic and Thailand. Most groundwater used as a source of drinking water in rural areas has been found to be contaminated with arsenic exceeding the WHO drinking water guideline of 10 μg·L . With the exception of Thailand, groundwater was found to be contaminated with naturally occurring arsenic in the region. Interestingly, high arsenic concentrations (>10 μg·L ) were generally found in the floodplain areas located along the Mekong River. The source of elevated arsenic concentrations in groundwater is thought to be the release of arsenic from river sediments under highly reducing conditions. In Thailand, arsenic has never been found naturally in groundwater, but originates from tin mining activities. More than 10 million residents in Southeast Asia are estimated to be at risk from consuming arsenic-contaminated groundwater. In Southeast Asia, groundwater has been found to be a significant source of daily inorganic arsenic intake in humans. A positive correlation between groundwater arsenic concentration and arsenic concentration in human hair has been observed in Cambodia and Vietnam. A substantial knowledge gap exists between the epidemiology of arsenicosis and its impact on human health. More collaborative studies particularly on the scope of public health and its epidemiology are needed to conduct to fulfill the knowledge gaps of As as well as to enhance the operational responses to As issue in Southeast Asian countries.

Keywords： arsenic     groundwater     drinking water     arsenicosis     Mekong River     Southeast Asia    

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The Geochemistry and Mineralization Evolvement of Gejiu Tin Ore Deposits

Qin Dexian,Li Yingshu,Fan Zhuguo,Chen Aibing,Tan Shucheng,Hong Tuo,Li Lianju,Lin Xiaoping

Strategic Study of CAE 2006, Volume 8, Issue 1,   Pages 30-39

Abstract:

It had been believed that the genesis of Gejiu tin deposits were granitic mineralization of Yanshanian epoch by most researchers for a long time. However, recently the authors obtain a great deal of information to indicate that the Gejiu tin deposits are occured as mineralization of many time periods and many sources, being divided as three metallogenic series namely the seabed basic volcano- metallogenic series, the seabed exhalative hydrothermal metallogenic series in the Indo-Chinese epoch and the granitic superimposed metallogenic series in the Yanshanian epoch. The metallogenic pattern may be summed up as “rift setting—the volcano-sedimentary metallogenises—the exhalative hydrothermal sedimentary metallogenises—the granit rebuild superimposed metallogenises”.The paper demonstrater the metallogenic viewpoint in terms of the trace rare earth element, stable isotopes and fluid inclusion.

Keywords： Gejiu tin deposits     geochemistry     stable isotopes     mineralization evolvement    

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Interdisciplinary Perspective from the Earth Scientist’s Periodic Table: Similarity and Connection between Geochemistry Perspective

Fenglong Sun, Zhongwei Zhao

Engineering 2020, Volume 6, Issue 6,   Pages 707-715 doi: 10.1016/j.eng.2020.04.002

Abstract: applied science, metallurgy is based on mineral composition and element behavior, that is similar to geochemistryThis article provides many metallurgical examples based on the principles of geochemistry to verify these

Keywords： Metallurgy     Geochemistry     Periodic table Ionic potential     Elemental affinity    

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Environmental process of the deep-water lakes and approach to the protection of water resources on the Yunnan-Guizhou Plateau

Wan Guojiang

Strategic Study of CAE 2009, Volume 11, Issue 5,   Pages 60-71

Abstract:

It is of local, regional and global importance to understand the environmental changes on the Yunnan-Guizhou Plateau. Difference on bio-geochemical process of the sediment-water interface exists among lakes so that protection approaches to water resources vary. a. The coal mining in the catchment of Lake Aha causes Fe-Mn accumulation in the sediment leading to the seasonal secondary pollution. In anoxic condition, the sulphate deoxidization migrates to the upper layer of sediments which results in Fe2+ screening of the diffusive boundary layer. The Fe-Mn cycling is controlled by both the sediment-water geological interface and oxidation-reduction chemical interface. Controlling Fe-Mn release and reducing their flux into the lake, selecting good-quality water district and cleaning sludge are efficient ways to control pollutions. b. Paroxysmal deterioration of water quality in Lake Baihua appeared in autumn, 1994 in Guizhou. Analysis of incident cross-correlation water-quality indicators indicated that the "Lake Black Tide"  resulted from the coupling of bio-oxidation of depositional organic matters under the specific season and climatic conditions; pH-restraint of de-nitric process led to increase in NO-2 concentration. The water quality was expected to recover in times with the balancing of oxygen in waters, input of water flow and better weather conditions. This was confirmed by the late monitoring. c. The average sedimentation rate of Lake Erhai is 0.047 g ·cm-2 ·a-1. The Pb-isotopic compositions of recent sediments indicate that may have a stable source. The depositional organic matter originates mainly from the land. In the chemical processes of early diagenesis, the Corg vertical profiles of sediments show three stages "Deposition-Decomposition-Accumulation" . In the last 460 years, small-scope frequent fluctuation of δ13Corg and synchronically decreasing trends of δ13Cinorg and δ18Oinorg indicate an obvious influence of human activity in the catchment. Control of input flux of terrestrial organic matters into Lake Erhai is a fundamental strategy. d. Lake Chenghai in Yunnan is a moderate-eutrophic lake with a total ion concentration close to a low limit of saline lake. The atomic ratios of Horg/Corg and Corg/Norg indicate that the organic matters mainly stem from the endogenous plankton algae remains; there is a good synchronous relationship of the depositional fluxes between 210Pbex and Corg in the sedimentary records. In particular, the synchronizations over the time indicate the increase in the lake primary productivity. The Clean-Effect reflects an adjustive role of lake nature function in the lake eutrophication.

Keywords： regional environment     deep-water lakes     environmental process     radioactive trace     environmental bio-geochemistry    

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Compared and analyzed the petrology and geochemistry of felsic rock mass enriches rare and non-ferrous

Wang Zixi,Ling Jinlan and Song Yanfang

Strategic Study of CAE 2015, Volume 17, Issue 2,   Pages 50-58

Abstract:

The felsic rock mass always enrich Cu，Mo，W，Sn，Nb，Ta ，then become an rare and non-ferrous metals deposit.Most of these rock masses are small（area＜10 km2）. High SiO2， K2O， K2O/Na2O are benefit of enriching Mo in the magma which rock mass enriches Cu， Mo；high Al2O3， Fe2O3T， MgO， CaO are benefit of enriching Cu in the magma which rock mass enriches Cu，Mo.High SiO2， K2O are benefit of enriching W in the magma which rock mass enriches W， Sn；high Al2O3， Fe2O3T， MgO， CaO are benefit of enriching Sn in the magma which rock mass enriches W，Sn.High Fe2O3T， alkali，TiO2 and low P2O5 are benefit of enriching in the magma which rock mass enrich Nb， Ta. The enriching Cu of rock mass is S type granite，but the enriching Mo of rock mass is transiting from I type to S type granite；the enriching W， Sn of rock mass is S type granite； the enriching Nb， Ta of rock mass has A type， I type and S type granites.

Keywords： felsic rock mass；rare metal；non-ferrous metal；formation of rock；small rock mass    

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Title Author Date Type Operation

Arsenic geochemistry of groundwater in Southeast Asia

Kyoung-Woong Kim, Penradee Chanpiwat, Hoang Thi Hanh, Kongkea Phan, Suthipong Sthiannopkao

Journal Article

The Geochemistry and Mineralization Evolvement of Gejiu Tin Ore Deposits

Qin Dexian,Li Yingshu,Fan Zhuguo,Chen Aibing,Tan Shucheng,Hong Tuo,Li Lianju,Lin Xiaoping

Journal Article

Interdisciplinary Perspective from the Earth Scientist’s Periodic Table: Similarity and Connection between Geochemistry

Fenglong Sun, Zhongwei Zhao

Journal Article

Environmental process of the deep-water lakes and approach to the protection of water resources on the Yunnan-Guizhou Plateau

Wan Guojiang

Journal Article

Compared and analyzed the petrology and geochemistry of felsic rock mass enriches rare and non-ferrous

Wang Zixi,Ling Jinlan and Song Yanfang

Journal Article