collapse breccia

collapse breccia

[kə′laps ‚brech·ə]
(geology)
Angular rock fragments derived from the collapse of rock overlying a hollow space.
References in periodicals archive ?
The 2013 core drilling suggests that the tabular zones of mineralized, favourable host rock are cut by one or more high-angle structures causing collapse breccia zones where the mineralization becomes thicker and higher-grade.
13-11 and 13-08 confirm continuity of high-grade gold in the extensive, lower, flat-tabular, collapse breccia body; which is analogous host material for many large Carlin-style deposits.
This lower breccia, which is comprised dominantly of collapse breccia, is the preferred depositional environment for gold and the intercept in 13-08 is essentially open in all directions.