TEM observation of geogas-carried particles from the Changkeng concealed gold deposit, Guangdong Province, South China

Cao, Jianjin; Hu, Ronggui; Liang, Zhirong; Peng, Zhenwei

doi:10.1016/j.gexplo.2008.09.001

Cited by 70 publications

(23 citation statements)

References 24 publications

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“…Moreover, sulfate aerosols can directly affect the climate (Graf et al, 1998). In our previous work, particles carried by an ascending geogas flow in the soil (Holub et al, 1999(Holub et al, , 2001Cao et al, 2009Cao et al, , 2010bCao et al, , 2011Liu et al, 2011;Wei et al, 2013;Hu et al, 2015) were studied and found to contain sulfur. Further research showed that sulfur-containing particles carried by ascending geogas flows can be transported through the soil layers and into the atmosphere.…”

Section: Introductionmentioning

confidence: 98%

Sulfur-containing particles emitted by concealed sulfide ore deposits: an unknown source of sulfur-containing particles in the atmosphere

Cao

Jiang

et al. 2015

Atmos. Chem. Phys.

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Abstract. Sources of sulfur dioxide, sulfates, and organic sulfur compounds, such as fossil fuels, volcanic eruptions, and animal feeding operations, have attracted considerable attention. In this study, we collected particles carried by geogas flows ascending through soil, geogas flows above the soil that had passed through the soil, and geogas flows ascending through deep faults of concealed sulfide ore deposits, and analysed them using transmission electron microscopy. Numerous crystalline and amorphous sulfurcontaining particles or particle aggregations were found in the ascending geogas flows. In addition to S, the particles contained O, Ca, K, Mg, Fe, Na, Pb, Hg, Cu, Zn, As, Ti, Sr, Ba, Si, etc. Such particles are usually a few to several hundred nanometres in diameter with either regular or irregular morphology. The sulfur-containing particles originated from deep-seated weathering or faulting products of concealed sulfide ore deposits. The particles suspended in the ascending geogas flow migrated through faults from deepseated sources to the atmosphere. This is a previously unknown source of the atmospheric particles. This paper reports, for the first time, the emission of sulfur-containing particles into the atmosphere from concealed sulfide ore deposits. The climatic and ecological influences of these sulfurcontaining particles and particle aggregations should be assessed.

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Section: Introductionmentioning

confidence: 98%

Sulfur-containing particles emitted by concealed sulfide ore deposits: an unknown source of sulfur-containing particles in the atmosphere

Cao

Jiang

et al. 2015

Atmos. Chem. Phys.

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“…1999). Gold particles discovered in ascending gas at the Changkeng concealed gold deposit in Guangdong Province, southern China (Cao et al. 2009), showed that gold in gas can be in the form of very small particles.…”

Section: Introductionmentioning

confidence: 99%

Simulation of adsorption of gold nanoparticles carried by gas ascending from the Earth’s interior in alluvial cover of the middle–lower reaches of the Yangtze River

Cao

Jiang

et al. 2010

Geofluids

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The adsorption onto other minerals of charged gold nanoparticles, carried by gas ascending from the Earth's interior, is an important component of their transport and deposition in surficial cover such as alluvial, aeolian, and glacial sediments. To simulate the adsorption of these particles, an experiment was conducted in which a flow of air that contained gold nanoparticles was passed upward through a sample of alluvium from the middlelower reaches of the Yangtze River. These experiments showed that gold nanoparticles are adsorbed on kaolinite, halloysite, goethite, and hematite in the alluvial cover. Both the gold nanoparticles and minerals (i.e., kaolinite, halloysite, goethite, and hematite) carry surface charges that provide them with excellent adsorption properties. This study showed that the specific mineral composition of surficial alluvial cover affects the concentration of gold nanoparticles in the ascending gas. This phenomenon may plausibly be used in exploration for concealed gold, copper-gold, and silver-gold deposits in areas of thick alluvial cover.

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“…The origins and migration forms of the particles carried by the ascending gas flow are one of the important problems to solve in geogas prospecting, and they play an extremely important role in the application of deposit prospecting (Cao, 2011;Cao et al, 2009Cao et al, , 2010aEtiope and Lombardi, 1996;Malmqvist, 1980, 1982;Zhou et al, 2003). In our studies, the particles carried by the ascending gas flow and the corresponding soil samples were collected and analyzed by TEM technique.…”

Section: Comparison Of Particles Carried By the Ascending Gas Flow Wimentioning

confidence: 99%

“…Native vanadiumplatinum-iron-cobalt alloys were first observed in the ascending gas flow at the Dongshengmiao deposit. Cao et al (2009) first used TEM to identify the native gold particles in the ascending gas flow at the Changkeng concealed gold deposit, Guangdong Province, Southern China. Cao et al (2010b) also used the TEM to discover the native copper, native copper-iron alloy, and native chromium-iron-copper alloy in the ascending gas flow at the Tongchanghe copper mine, Guizhou Province, China.…”

Section: Characteristics and Originsmentioning

confidence: 99%

TEM observations of particles based on sampling in gas and soil at the Dongshengmiao polymetallic pyrite deposit, Inner Mongolia, Northern China

Luo

Cao

Yan

et al. 2015

Journal of Geochemical Exploration

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TEM observation of geogas-carried particles from the Changkeng concealed gold deposit, Guangdong Province, South China

Cited by 70 publications

References 24 publications

Sulfur-containing particles emitted by concealed sulfide ore deposits: an unknown source of sulfur-containing particles in the atmosphere

Sulfur-containing particles emitted by concealed sulfide ore deposits: an unknown source of sulfur-containing particles in the atmosphere

Simulation of adsorption of gold nanoparticles carried by gas ascending from the Earth’s interior in alluvial cover of the middle–lower reaches of the Yangtze River

TEM observations of particles based on sampling in gas and soil at the Dongshengmiao polymetallic pyrite deposit, Inner Mongolia, Northern China

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