Overview
ISO 710-6:1984 is an international standard developed by the International Organization for Standardization (ISO) that provides a comprehensive set of graphical symbols for use on detailed geological maps, plans, and cross-sections. Specifically, Part 6 focuses on the representation of contact rocks and rocks that have undergone various transformations such as metasomatic, pneumatolytic, hydrothermal, or weathering processes. This standard enables geologists, cartographers, and engineers to consistently depict complex rock transformations resulting from contact metamorphism and associated geochemical processes.
Key Topics
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Scope and Purpose
ISO 710-6 establishes a unified system of symbols addressing rocks formed or altered by contact metamorphism and processes involving the introduction or alteration of material via metasomatism, pneumatolytic and hydrothermal activity, or weathering. The symbols allow clear communication of geological features while maintaining clarity and consistency.
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Classification of Symbols
The graphical symbols in this standard are categorized into four main groups:
- a) Contact rocks formed by isochemical processes near magmatic intrusions
- b) Rocks transformed by metasomatic processes involving allochthonous material
- c) Rocks affected by pneumatolytic and hydrothermal transformations
- d) Rocks altered by atmospheric weathering processes
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Symbol Design Principles
The symbols are designed to:
- Represent newly formed rocks from various transformation processes
- Supplement the symbol of the original rock when appropriate
- Reflect different transformation intensities, textures, or mineralogical changes
- Be applied uniformly across maps and cross-sections without indicating texture orientation unless specified
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Representation Techniques
Contact rocks use variants of the source rock symbols with consistent placement on maps. Metasomatic and hydrothermal transformations utilize symbols layered or added at irregular intervals over the original rock symbol, indicating mineral modifications or alterations. The weathering process is represented by a distinct symbol showing surface-level influences and degrees of alteration.
Applications
ISO 710-6 is essential for professionals involved in:
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Geological Surveying and Mapping
Accurately portraying zones of contact metamorphism and related transformations on geological maps enhances understanding of subsurface conditions and mineral distributions.
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Mining and Mineral Exploration
Symbolizing alterations such as tourmalinization, silicification, or kaolinization helps identify mineralization zones critical for exploration targeting.
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Engineering Geology and Environmental Studies
Recognizing weathered rocks and hydrothermal alterations on engineering plans informs site assessment and hazard analysis.
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Academic Research and Education
Provides a standardized visual language for teaching geological processes and documenting field observations involving contact metamorphic and associated transformations.
Related Standards
ISO 710-6 is part of the ISO 710 series addressing graphical symbols for geological representations:
Together, these parts provide a complete framework for consistent, internationally recognized geological symbology.
Keywords: ISO 710-6, geological symbols, contact rocks, metasomatic transformation, pneumatolytic transformation, hydrothermal transformation, weathered rocks, geological mapping standards, geological cross-sections, metamorphic rock representation, geological cartography.