פענוח התפתחותו הטקטונית של הגליל התחתון מהגידוע האוליגוקני ועד למעוות המיוקני-פליוקני

ד"ר רלי ולד, המכון הגיאולוגי ואוניברסיטת חיפה

Development of the lower Galilee from Oligocene truncation to Miocene-Pliocene deformation


Wald, R., 1,2 Schattner, U., 1 Segev, A.,2 Ben-Avraham, Z. 1,3
1. The Dr. Moses Strauss Department of Marine Geosciences, Leon H. Charney School of marine sciences, Haifa University, Mt. Carmel, Haifa 31905, Israel
2. Geological Survey of Israel, 30 Malkhe Israel, Jerusalem 95501, Israel
3. Department of Atmospheric, Geophysical and Planetary Sciences, Tel Aviv University, Tel Aviv 69978, Israel

The Oligocene-to-recent geological history of the lower Galilee is rich in events. Since its truncation and pene-planation the region was faulted, subsided, folded and experienced volcanism. Previous studies attributed the Miocene subsidence of the lower Galilee basins to extension that is possibly related to the shift between Red Sea to Dead Sea stress regimes. However, the structure of these basins, their mode of formation and post Miocene development are still debated. Here we present an interpretation of 75 multi-channel seismic reflection profiles, combined with 506 boreholes and surface geology. Data show that the Oligocene erosion truncated northern Israel down to Lower Cretaceous formations. Its products accumulated on the western and eastern (Bet-Shean deep basin, which preserved a ~250 m thick Oligocene section) flanks of the truncated NNE trending Syrian Arc fold belt. The Miocene subsidence of the lower Galilee basins, which follows a NW-SE axis, was accompanied by volcanism and syn-depositional normal faulting. Principal faulting pattern includes a set of NW-SE faults, parallel to the rifting and a perpendicular NE-SW directed set. The subsidence culminated by late Miocene truncation. Pliocene faulting sheared and segmented the basins. This analysis examines these findings in view of the far field effect of the Afar plume and of the Arabia-Eurasia convergence

 



תאריך 22/05/2016 12:00
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