Abstract
An architectural hierarchy of elastic sills is recognized in the Panoche Giant Injection Complex in which staggered, stepped with erosive top surfaces, and multi-layered geometries occur in that stratigraphic order upward. Genetic relationships between parent depositional sand bodies, the sand injections, a zone of hydraulic fracture and a palaeo sea floor are seen at a scale previously observed only by using seismic data. Sills and randomly oriented dykes intrude into a hydraulically fractured shale unit above and below which dykes predominate. Erosive surfaces (scallops) are identified on sills that, along with smaller erosional features, record low-viscosity turbulent flow during sand injection. Sand extrusions occur where dykes reach the palaeo sea floor.
Original language | English |
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Pages (from-to) | 609-612 |
Number of pages | 4 |
Journal | Journal of the Geological Society |
Volume | 165 |
Issue number | 3 |
DOIs | |
Publication status | Published - May 2008 |
Keywords
- sandstone intrusions
- North-Sea
- California
- migration
- injection