plunging fold

plunging fold

[′plənj·iŋ ′fōld]
(geology)
A fold having a relatively steep plunge. Also known as pitching fold.
References in periodicals archive ?
In 2007, a suite of twenty three rock chip samples (CKR001 - CKR023) collected from surface at the south-eastern end of Cockatoo Island were submitted to Ammtec Ltd in Perth to test outcropping iron mineralisation within the keel of a plunging fold nose in the central part of the island as potential feed source for a WHIMS beneficiation project.
A total of thirty-one reverse circulation drill holes were completed to test iron mineralisation widths and grades within the Magazine Schist based on both interpreted contact positions of outcropping hematite quartzites and encouraging results from initial WHIMS test work within the keel of a plunging fold nose in the central part of the island.
Whether this is going to be another southwest plunging fold - like so many others in the southern Karachi Arc is not known (Figs.
We interpret the Isakai structure to be a mushroom- shaped east plunging fold structure with Bara-Tazikhel thrusts as the breached divergent limbs of this fold structure.
[F.sub.1b] and [F.sub.1] are generally tight to isoclinal, NNE-trending, WNW-verging, shallowly plunging folds (Fig.
Comparison of attitudes of axial planes (009[degrees], 75[degrees]/099[degrees]) and [beta]-axis (5[degrees]/011[degrees]) of the regional fold with that of the NE /SW plunging folds (A/P: 014[degrees], 72[degrees]/104[degrees] and mean [beta]-axis 4[degrees]/015[degrees]) show that they are fairly compatible, which implies that the NE/SW plunging minor folds are coaxial with the regional fold(s).
At M63 layering is sub-vertical and strikes approximately east-west although modified by steep plunging folds in part.