Multi-element geochemical mapping in Southern China

Abstract

The 76-element Geochemical Mapping (76 GEM) Project was undertaken in southwestern China in 2000 and in southeastern China in 2008. In this project, 5244 composite samples of stream sediment at a density of one composite sample for each 1:50,000-scale map sheet were prepared from sample archives of the China Regional Geochemistry-National Reconnaissance (RGNR) Project, which have been available since 1978. The 76 elements were analyzed by using inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence (XRF), and inductively coupled plasma atomic emission spectroscopy (ICP-AES). In the present study, a new quality-control method known as the visualized standard map method was applied to the results of the 76 GEM project. Mean value and background value, which indicate the average concentration of the 76 elements in southern China, were derived from statistical data. Moreover, geochemical maps were compiled to demonstrate the distribution of the 76 elements in southern China.

Low density geochemical mapping and mineral exploration: application of the mineral system concept

“…Cheng et al 2014) and the North American Soil Geochemical Landscapes Project (Smith et al 2014). Results of all these surveys should be studied in detail to detect signs (footprints) of mineral systems and their geochemical surface expression.…”

“…An exception is the Chinese 76 element Geochemical Mapping Project (76GEM; see e.g. Cheng et al 2014), where the PGEs are routinely analysed for at exceptionally low DLs. In addition, deposits containing Ni, Cu and PGEs are usually associated with mafic and ultramafic rocks (e.g.…”

Review of the Spatial Distribution, Source and Extent of Heavy Metal Pollution of Soil in China: Impacts and Mitigation Approaches

“…Heavy metals in soil originate from many sources, including atmospheric deposition, sewage irrigation, improper disposal of industrial solid waste, mining activities, volcanic activities, the use of pesticides and fertilizers, and others. 3 , 7 , 10 , 31–33 Sources of heavy metals in the environment can be categorized into natural and anthropogenic sources. 24 …”

“…Moreover, the increase has been swift over the last two decades owing to rapid growth of the economy, industrialization and anization. 3 , 6 , 8 , 10 , 12 , 14 , 16 , 21 , 24 , 31 , 32 , 34 , 35 , 40 , 45–48 Even though the seriousness of the problem has been known for the last few decades, pollution continues to worsen and there have been limited successful approaches to resolving this issue. 24 However, due to the emergence of comprehensive pollution reports in 2014, greater focus has been given to the extent of emissions of Pb, Hg, Cd, Cr and As due to their high toxicity, prevalence, and persistence in the environment.…”

Estimation of terrestrial air-absorbed dose rate from the data of regional geochemistry database

“…The procedures include: adding standard reference materials, repeat analyzing, carrying out inter-laboratory comparison and analysis quality monitoring program [23][24][25]. Since a large number of samples are collected in RGNR to be analyzed for multielement content in a short time, the contents of K 2 O and Th were mainly analyzed by using X-ray fluorescence (XRF) spectrometry and U by laser fluorescent (LF).…”