The single component geochemical map

Single component geochemical maps are the most basic representation of spatial elemental distributions and commonly used in environmental and exploration geochemistry. However, This is a peer reviewed article in the Journal of Geochemical Exploration. the compositional nature of geochemical data imposes several limitations on how the data should be presented. The problems relate to the constant sum problem (closure), and the inherently multivariate relative information conveyed by compositional data. Well known is, for instance, the tendency of all heavy metals to show lower values in soils with significant contributions of diluting elements (e.g., the quartz dilution effect); or the contrary effect, apparent enrichment in many elements due to removal of potassium during weathering. The validity of classical single component maps is thus investigated, and reasonable alternatives that honour the compositional character of geochemical concentrations are presented. The first recommended such method relies on knowledge-driven log-ratios, chosen to highlight certain geochemical relations or to filter known artefacts (e.g. dilution with SiO2 or volatiles). This is similar to the classical normalisation approach to a single element. The second approach uses the (so called) log-contrasts, that employ suitable statistical methods (such as classification techniques, regression analysis, principal component analysis, and clustering of variables) to extract potentially interesting geochemical summaries. The caution from this work is that if a compositional approach is not used, it becomes difficult to guarantee that any identified pattern, trend or anomaly is not an artefact of the constant sum constraint. In summary the authors recommend a chain of enquiry that involves searching for the appropriate statistical method that can answer the required geological or geochemical question whilst maintaining the integrity of the compositional nature of the data. The required log-ratio transformations should be applied followed by the chosen statistical method. Interpreting the results may require a closer working relationship between statisticians, data analysts and geochemists.



Website:

http://www.sciencedirect.com/science/article/pii/S0375674215301047

Simple

Date (Creation)
2016-03-01
Date (Publication)
2016-03-01
Date (Revision)
Citation identifier
https://www.mica-project.eu/ / MICA_B3-200

MICA WP3 2018-11-03T15:16:00 Record extracted from Batch 3 spreadsheet

Other citation details

No other citation details provided
Purpose

Purpose for data generation is not known
Status
Completed
Point of contact
Organisation name Individual name Electronic mail address Role

School of Geography, Archaeology and Palaeoecology, Queen's University

 		Resource provider
Maintenance and update frequency
Not planned
dataCentre

  • MICA

MICA ontology (TemporalScheme)

  • Mixture of historic (up to 2005) and recent (2006 onwards)

MICA ontology (DataScheme)

  • General descriptive information / Paper
Keywords

  • Requirement for data generation: Voluntary
Keywords

  • Method of data or information generation: Academic research

GEMET Concepts

  • Exploration

GEMET Concepts

  • Geochemical

INSPIRE commodities

  • Gold

INSPIRE commodities

  • Silver

INSPIRE commodities

  • Platinum

INSPIRE commodities

  • Palladium

INSPIRE commodities

  • Other platinum group metals (iridium)

INSPIRE commodities

  • Other platinum group metals (osmium)

INSPIRE commodities

  • Other platinum group metals (rhodium)

INSPIRE commodities

  • Other platinum group metals (ruthenium)

INSPIRE commodities

  • Aluminium

INSPIRE commodities

  • Copper

INSPIRE commodities

  • Lead

INSPIRE commodities

  • Tin

INSPIRE commodities

  • Zinc

INSPIRE commodities

  • Chromium

INSPIRE commodities

  • Cobalt

INSPIRE commodities

  • Iron

INSPIRE commodities

  • Manganese

INSPIRE commodities

  • Molybdenum

INSPIRE commodities

  • Nickel

INSPIRE commodities

  • Niobium

INSPIRE commodities

  • Tungsten

INSPIRE commodities

  • Vanadium

INSPIRE commodities

  • Antimony

INSPIRE commodities

  • Beryllium

INSPIRE commodities

  • Bismuth

INSPIRE commodities

  • Cadmium

INSPIRE commodities

  • Cesium

INSPIRE commodities

  • Gallium

INSPIRE commodities

  • Germanium

INSPIRE commodities

  • Hafnium

INSPIRE commodities

  • Indium

INSPIRE commodities

  • Lithium

INSPIRE commodities

  • Magnesium

INSPIRE commodities

  • Mercury

INSPIRE commodities

  • Rare earths (undifferentiated)

INSPIRE commodities

  • Rhenium

INSPIRE commodities

  • Rubidium

INSPIRE commodities

  • Selenium

INSPIRE commodities

  • Tantalum

INSPIRE commodities

  • Tellurium

INSPIRE commodities

  • Titanium

INSPIRE commodities

  • Zirconium

MICA ontology (DomainScheme)

  • Detailed geochemistry

MICA ontology (DomainScheme)

  • Regional geochemistry
Access constraints
Other restrictions
Use constraints
Other restrictions
Language
English
Topic category
  • Geoscientific information
  • Economy
Geographic identifier
Europe - EU28 members only (aggregated total only)
Hierarchy level
Non geographic dataset
Other

Individual item (e.g. a one-off academic paper or single website)

Conformance result

Title

Data uncertainty
Date
Explanation

Are any uncertainty measures provided (e.g. standard errors, confidence intervals, etc.)?
Pass
No

Conformance result

Title

Quality assurance procedures
Date
Explanation

Are quality assurance procedures described?
Pass
Yes

Conformance result

Title

Information generation methods
Date
Explanation

Are data or information generation methods formally described?
Pass
Yes

Conformance result

Title

Record review
Date
Other citation details

Reviewed by: British Geological Survey
Explanation

Record validation
Pass
No

Conformance result

Title
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Date (Publication)
2010-12-08
Statement

Organisation source implies that information should be of good quality

Metadata

File identifier
88c72939-5920-4fca-a3de-89489bcc1eec XML
Metadata language
English
Character set
MD_CharacterSetCode_utf8
Hierarchy level
Non geographic dataset
Date stamp
2024-11-07
Metadata standard name

ISO19115
Metadata standard version

2003/Cor.1:2006
Metadata author
Organisation name Individual name Electronic mail address Role

British Geological Survey

enquiries@bgs.ac.uk

Point of contact
 
 

Overviews

overview

Keywords

MICA


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