New insights in the origin of cone-in-cone structures
Previous theories on cone-in-cone structure origin have failed to explain some of its features, such as the absence of cone-in-cone in veins other than horizontal and the cross-cutting relations of conical surfaces to detritical clay films. They have neither taken in account the importance of pore p...
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_08912556_v9_n2_p172_SellesMartinez |
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| Sumario: | Previous theories on cone-in-cone structure origin have failed to explain some of its features, such as the absence of cone-in-cone in veins other than horizontal and the cross-cutting relations of conical surfaces to detritical clay films. They have neither taken in account the importance of pore pressures in the process of growth of veins and concretions nor the effects of its fall in the deformation of these calcite bodies. A new hypothesis for cone-in-cone origin is presented, which states that cones are a secondary feature. They are superimposed on crystalline aggregates that grow in overpressured chambers and formed as a result of brittle fracture induced by a decrease in pore pressure within materials having different mechanical properties (plastic host sediments and brittle calcite bodies). The acceptance of this hypothesis will help in the identification of seals in ancient diagenetic environments and in assessing depth of entrapment for fluids. © 1994 Springer. |
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