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 comparison between collapse breccia and bedrock revealed that although higher contents of P, Cr, Ba, Co, and Ni occurred in the collapse breccia, they were lower than those in the sand-shale filling.
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.