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Added: May 11, 20252025-05-11T18:19:45-04:00 2025-05-11T18:19:45-04:00In: Geology

Which elements are commonly analyzed in geochemical surveys?

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Geochemical surveys analyze a diverse suite of elements in geological materials like soil, rock, and sediment to identify anomalies indicative of hidden mineral deposits (AMEC, 2023). The specific elements targeted depend on the type of mineralization sought and the local geological context.

Commonly, surveys analyze for primary economic targets such as base metals like copper (Cu), lead (Pb), and zinc (Zn) and precious metals like gold (Au) and silver (Ag) (NPS, n.d.). Alongside these, pathfinder elements are crucial. These elements, such as arsenic (As), antimony (Sb), mercury (Hg), and molybdenum (Mo), are geochemically associated with target ores and may form broader, more easily detectable dispersion halos, guiding exploration toward the source (China Geological Survey, n.d.).

Analysis often includes major rock-forming elements (e.g., SiO2, Al2O3, K2O, Fe2O3) to understand background geochemistry and identify alteration patterns linked to mineralization (EarthSci, n.d.).

Depending on the exploration focus, other economically significant elements like nickel (Ni), tin (Sn), chromium (Cr), manganese (Mn), and increasingly, rare earth elements (REEs), lithium (Li), and cobalt (Co) are also targeted (China Geological Survey, n.d.).

The ultimate goal is to detect statistically significant deviations from background elemental concentrations, thereby pinpointing areas that warrant more detailed investigation (AMEC, 2023).

Why do geologists look for elements like arsenic or mercury when they’re really searching for gold or copper? Share your thoughts!

References:
AMEC. (2023). Exploration and Mining Fact Sheet: Exploration Methods. Association of Mining and Exploration Companies. Retrieved from https://amec.org.au/wp-content/uploads/2023/05/2102-AMEC-NSW-NSW-Fact-sheet-EXPLORATION-METHODS-FINAL.pdf
China Geological Survey (CGS). (n.d.). Test quality control method of geological samples. Retrieved from https://www.cgs.gov.cn/ddztt/kydh/2017kydh/dzdckjcx/201709/P020170921540392968765.pdf
EarthSci. (n.d.). Rock Sampling for Mineral Exploration. Retrieved from https://earthsci.org/mineral/rockmin/sampling/sampling.html
National Park Service (NPS). (n.d.). Geology of the Golden Trout Wilderness, Inyo and Tulare Counties, California – Geochemical Exploration. Retrieved from https://www.nps.gov/parkhistory/online_books/geology/publications/bul/1359/sec2a.htm
Which elements are commonly analyzed in geochemical surveys?
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