The project hosts an extensive area of phyllic alteration, including local zones of potassic alteration, porphyry-style veining with chalcopyrite mineralization, and diatreme
, pebble dyke, and magnetite breccias in Eocene and Miocene intrusive rocks.
2007): Cenozoic diatreme
field in Chubut (Argentina) as evidence of phreatomagmatic volcanism accompanied with extensive Patagonian plateau basal volcanism?
The resulting diatreme
is a funnel-shaped crater filled in deep by breccia of original country rock "fluffed up" with the explosion.
This feature is interpreted as a diatreme
breccia and it has evidence of argillic alteration on its periphery.
This style of breccia is often referred to as diatreme
While the source diatreme
for Ripple Lake Diamonds' initial sample was a mere three-by-three metres and did not have any real financial significance on its own, the discovery is credited for leapfrogging the company's progress.
Mapping in this area also outlined a swarm of diabase dykes and associated diatreme
breccias, which were emplaced in the main E-W rift associated with the Richmond Gulf zone (Simard et al.
Key words: diatreme
, graphitic schists, Cerro Negro, porphyries, gold.
Reverse circulation and diamond drilling along with IP and ground magnetic surveys point to a diatreme
model with sub surface targets near the diatreme
the mineralisation at Nevera continues past NEV028, and that NEV028 was drilled in an area that was either faulted away or disrupted by a diatreme
The year 2006 was the celebration of the 100th anniversary of the discovery of diamonds in the Prairie Creek diatreme
near Murfreesboro, Arkansas by John Huddleston, a local pig farmer.
Approximately 30 kimberlite occurrences have been identified in the district, including the larger, upper-level diatreme
facies such as at Sloan and Kelsey Lake, lower-level diatreme
to root zone intrusions, such as at Nix and Moen; and hypabyssal dikes such as George Creek.