Orientation study of strategic deep penetration geochemical methods in the central Kyzylkum desert terrain, Uzbekistan

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

“…Previous studies have indicated that high concentration (anomaly) of metallogenic elements (such as Au) of the geogas substances is closely related to concealed ore bodies (Malmqvist and Kristiansson, 1984;Kristiansson et al, 1990;Wang et al, 1997;Tong et al, 1998;Xie et al, 1999;Malmqvist et al, 1999). In our work, the Hg-, Zn-, Pb-, or Wbearing particles and gold particles have been not found in blank contrast samples from barren area, showing that the geogas particles are related to concealed ore bodies.…”

“…Geogas is defined as an ascending flow of gaseous matter such as N 2 , O 2 , CO 2 , CO, CH 4 , NH 3 (Tong and Li, 1999) originating from degassing of the upper mantle and lithosphere (Gold and Soter, 1980;Morner and Etiope 2002;Annunziatellis et al, 2003), releasing from ore mineral weathering , atmosphere driven by barometric pumping (Cameron et al, 2004). Geogas might be a global phenomenon, because it has been widely reported from many ore deposits worldwide (Xie et al, 1999). It can carry solid substances from concealed ore bodies or other geological bodies and transport them to the Earth's surface .…”

“…It can carry solid substances from concealed ore bodies or other geological bodies and transport them to the Earth's surface . Concealed ore bodies may be detected by capturing these geogas-carried substances in Quaternary sediments, and analyzing their extremely low element concentrations by instrumental neutron activation analysis (INAA), atomic absorption spectrometry (AAS), and particle induced X-ray emission (PIXE) Malmqvist, 1982, 1987;Malmqvist and Kristiansson, 1984;Kristiansson et al,1990;Wang et al,1997;Tong et al,1998;Hirner, 1998;Xie et al, 1999;Malmqvist et al, 1999;Cao et al, 2004). However, the traditional methods for estimating the concealed ore bodies consist only of measuring the element concentrations of the geogas-carried particles using different analytical methods.…”

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

“…The basic principles of geogas prospecting are that geogas is widely present as an ascending gas flow in the earth (Gold and Soter, 1980;Chiodini et al, 1995;Xie, 1995;Wang et al, 1997;Tong and Li, 1999;Wang et al, 1999;Morner and Etiope, 2002;Etiope and Martinelli, 2002;Annunziatellis et al, 2003;Wang, 2003;Cameron et al, 2004;Wang et al, 2007) and when the ascending gas flows through the ore body, it can carry solid substances from the concealed ore bodies or other geological bodies and transport them to the earth's surface; these solid substances primarily take the form of nano-scale particles (Cao, 2011;Cao et al, 2010a;Etiope, 1998;Etiope and Lombardi, 1996;Tong and Li, 1999;Tong et al, 1998;Wang et al, 2007). These ascending gas flow-carried substances can be captured by a collector, and a wealth of mineralization information about the concealed ore bodies can be obtained by using modern testing technologies (Cao et al, 2005(Cao et al, , 2010bMa et al, 1998;Malmqvist et al, 1999;Tong and Li, 1999;Tong et al, 1998;Wang et al, 1997Wang et al, , 1999Wang et al, , 2007Xie et al, 1999).…”

“…This technology is based on decades of development, and it is primarily embodied in the development of key techniques, including sampling methods, trapping mediums and analysis techniques. The current geogas sampling methods are primarily the static method and the dynamic method (Kristiansson et al, 1990;Malmqvist et al, 1999;Wang et al, 1997;Xie et al, 1999). The trapping mediums are comprised of various adsorption materials, for example, plastic film, polyurethane foam plastics, activated carbon and liquid adsorption materials (Kristiansson et al, 1990;Malmqvist et al, 1999;Pauwels et al, 1999;Tong et al, 1998).…”