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161.
The onset of the Messinian salinity crisis in the deep Eastern Mediterranean basin 总被引:1,自引:0,他引:1
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Vinicio Manzi Rocco Gennari Stefano Lugli Davide Persico Matteo Reghizzi Marco Roveri B. Charlotte Schreiber Ran Calvo Ittai Gavrieli Zohar Gvirtzman 《地学学报》2018,30(3):189-198
Astronomical tuning of the Messinian pre‐salt succession in the Levant Basin allows for the first time the reconstruction of a detailed chronology of the Messinian salinity crisis (MSC) events in deep setting and their correlation with marginal records that supports the CIESM ( 2008 ) 3‐stage model. Our main conclusions are (1) MSC events were synchronous across marginal and deep basins, (2) MSC onset in deep basins occurred at 5.97 Ma, (3) only foraminifera‐barren, evaporite‐free shales accumulated in deep settings between 5.97 and 5.60 Ma, (4) deep evaporites (anhydrite and halite) deposition started later, at 5.60 Ma and (5) new and published 87Sr/86Sr data indicate that during all stages, evaporites precipitated from the same water body in all the Mediterranean sub‐basins. The wide synchrony of events and 87Sr/86Sr homogeneity implies inter‐sub‐basin connection during the whole MSC and is not compatible with large sea‐level fall and desiccation of the Mediterranean. 相似文献
162.
Role of Rock Mass Fabric and Faulting in the Development of Block Caving Induced Surface Subsidence 总被引:1,自引:1,他引:0
Alexander Vyazmensky Davide Elmo Douglas Stead 《Rock Mechanics and Rock Engineering》2010,43(5):533-556
Extraction of a large volume of ore during block caving can lead to the formation of significant surface subsidence. Current
knowledge of the mechanisms that control subsidence development is limited as are our subsidence prediction capabilities.
Mining experience suggests that, among other contributing factors, geological structures play a particularly important role
in subsidence development. A conceptual modeling study has been undertaken to evaluate the significance of geological structure
on surface subsidence. A hybrid finite/discrete element technique incorporating a coupled elasto-plastic fracture mechanics
constitutive criterion is adopted; this allows physically realistic modeling of block caving through simulation of the transition
from a continuum to a discontinuum. Numerical experiments presented emphasize the importance of joint orientation and fault
location on mechanisms of subsidence development and the governing role of geological structure in defining the degree of
surface subsidence asymmetry. 相似文献