Post Your Answer
3 years ago in Economics , Hydrothermal Mineralization By Keerthi Gupta
What is the ’cockade’ texture like?
Reading papers on epithermal veins, authors frequently refer to 'cockade breccia' or 'cockade texture' as a key diagnostic feature. The descriptions mention concentric rings around clasts, but I'm unclear on the scale, mineralogy, and what it specifically indicates about fluid dynamics. A clear description would help me identify it in my own samples.
Â
All Answers (1 Answers In All)
By Gayatri Answered 1 year ago
I've seen beautiful examples in epithermal Au-Ag deposits. Imagine a angular fragment of wall rock suspended in a vein. Around it, you'll see distinct, concentric crustiform bands of different minerals perhaps an inner ring of quartz, then a band of adularia, then an outer ring of sulfides like sphalerite. It resembles a layered candy or a military badge (a 'cockade'). This texture is crucial because each ring represents a distinct pulse or chemical condition of the hydrothermal fluid. It tells you the fluid chemistry evolved, often cyclically, and mineralization occurred in open space, which is critical for understanding the deposit's permeability and grade distribution.
Â
Reply to Gayatri
Related Questions