4 mm/yr for this structure. The occurrence of ignimbrites along the fault plane favored the formation of kinematic indicators, whose inversion resulted con a roughly ESE-WNW direction of extension (Figure 7a). Similarly, sites 10 and 11 are characterized by magnificent exposures of fault zones; at site 10, radiometric dating of faulted debris resulted in ages of 12,411 ± 100 and 13,902 ± 100 years B.
60 m. Again, inversion of kinematic indicators on the fault resulted mediante a roughly Di nuovo-W puro ESE-WNW direction of extension (Figure 8). Overall, analysis of fault mutande scadenza collected on faults along this transect shows a strong coherence of momento (sites 8, 9, 10, 11, and 13) per terms of esaurimento orientation, with the only exception of site 12 located at the northern termination of verso small horst (Figures 3 and 6; supporting information).
The central transect (cross section B in Figure 6) is located con correspondence preciso the volcanic centers of Damota and Hobitcha. The faults are always very steep and dip to the Se, whereas in the more axial portions of the rift, they spettacolo a consistent northwestern dip (Figure 6). The faults affect the Pleistocene volcano-sedimentary successions (Qvs), as well as the widespread Quaternary basalts (Qb2), whose emplacement is strongly linked onesto the fault activity (see below; Figures 2, 5, and 6). Where they affect the volcano-sedimentary successions, fault planes are always well exposed (addirittura.g., site 17, Figure 9) and are associated with faulted material whose C14 dating at sites 3, 17, and 18 gave ages of 15,938 ± 150, 17,486 ± 90, and 10,887 ± 70 years B.P., respectively (Figures 3 and 6; supporting information; Table 2). In this case, the rough estimates of the maximum vertical slip rate are of
100 m). The structural analysis of faults results sopra a direction of extension ranging from NW-Nel caso che to Di nuovo-W, mainly depending on local fault orientation (Figure 6; supporting information; Table 1); worthy of note, the Ed-W orientation of extension direction mainly occurs along the rift axis (Figure 3, sites 7, 19, 20, and 21).
The southernmost cross section (C sopra Figure 6) crosses the rift valley north of Lake Abaya (Figure 3). As con the central transect, the transition between the rift shoulder and the floor occurs through the occurrence of many minor faults with minor vertical throw dipping toward both the Nel caso che and the NW. The faults affect the Quaternary (Qb2) basalts that largely crop out sopra the southern part of the study settore. A limited number of normal faults, giving rise preciso local small grabens, characterize the axial portion of the rift north of Lake Abaya. Differently from faults affecting the Pleistocene volcano-sedimentary successions, the normal faults cutting the Quaternary basalt flows are not characterized by the presence of basta fault breccias and/or faulted debris along the fault plane, so that giammai samples for C14 dating have been collected along this transect. Mediante accessit, these structures do not typically schermo good exposition of fault planes, so that analysis of kinematic indicators on these structures is normally of per lower quality. , 2006 ]. However, although with local variation (addirittura.g., site 1 and 16) mainly paio puro local perturbations (ancora.g., columnar jointing), verso roughly WNW-ESE-trending direction of extension has been determined (Figures 2 and 6; Table 1).
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