TS ISO 710-6/D1

TS ISO 710-6/D1 is the sixth part of the series of graphical symbols used on detailed geological maps, plans and geological cross-sections, and it focuses on the representation of contact rocks and rocks transformed by metasomatic, pneumatolytic, hydrothermal or weathering processes. In practice, such symbols help make not only the rock unit itself but also its genetic history readable within map notation.

Why these rock types need distinct map symbols

Contact rocks commonly form through heat and chemical interaction near an igneous intrusion and the surrounding country rock. Metasomatic alteration, pneumatolytic activity, hydrothermal alteration and weathering are different transformation pathways that can modify mineral content, texture and boundary relations. In general technical terms, separating these processes matters because similar-looking altered zones may reflect very different geological histories and resource implications.

What this part contributes to geological mapping

• A shared graphic convention for detailed geological maps, plans and cross-sections.
• A way to distinguish contact rocks from rocks altered by different transformation processes.
• More consistent communication of rock origin and alteration character in map form.
• A TSE publication based on ISO 710-6 for this technical subject area; the title and reference clearly anchor its focus.

As a result, the standard supports consistent visual notation as well as terminology used when reading geological maps. In practical work, it provides a common visual language for mining, regional geology and engineering geology where the formation and alteration history of rocks must be recognized quickly.