Tactite

A metamorphic rock formed through the contact metamorphism of calcareous sedimentary rocks like limestone or dolomite, typically near an igneous intrusion. The intense heat and hydrothermal fluids emanating from the intrusion alter the original minerals, leading to the formation of new minerals. Tactites are often characterized by a granular texture and the presence of minerals like garnet, pyroxene, epidote, wollastonite, and magnetite. They are valuable resources and sources of certain metals, including copper, iron, tungsten, and tin. The mineral composition reflects the original rock's composition and the infiltrating fluids.

Tactite meaning with examples

• Geologists discovered a significant tactite deposit adjacent to a granite intrusion. The newly exposed tactite, rich in garnet and magnetite, was indicative of intense contact metamorphism. Drilling operations were initiated to assess the economic viability, seeking valuable ore deposits. The geological surveys showed that this could be a critical new resource for the local area's industry.
• The research team analyzed the mineral composition of a tactite sample. The presence of wollastonite suggested high-temperature, silica-rich fluid interaction. Understanding the precise mineral makeup helps to reconstruct the conditions under which the tactite formed. The study of the tactite also provides insights into the emplacement history of the granite intrusion. This tactite was formed around a large body of magma.
• The mining operation was carefully extracting tactite from a hillside location. The extracted tactite exhibited a beautiful banding pattern. This tactite contains valuable iron deposits along with other important metals. This unique combination highlights the significance of contact metamorphism. The workers hoped to increase productivity of the tactite mining.
• A petrographic study examined the microscopic textures in a tactite thin section. Under polarized light, the granular structure was highly apparent. This detailed analysis is an important part of the tactite characterization process. The minerals present helped decipher the metamorphic conditions involved. This data is helping scientists understand the processes in these rocks.