Abstract
Apatite fission-track ages determined on 14 samples from the Ramon 1 and Hameishar 1 boreholes range from 33 to 122 Ma. All ages are younger than the stratigraphic age of their host rocks and most are interpreted as resulting from thermal resetting upon burial. In Ramon 1, the plot of apatite age versus depth shows a three-segmented profile. Analysis of the profile reveals a well-defmed rapid cooling event commencing ca. 85-90 M.Y .B.P. Since that time, cooling of
some 58°C is estimated for rocks at a present depth of 1475-1487 m. Most of the cooling (about 40 °C), which had already taken place by ca 80 M.Y.B.P., is attributed to a decrease in thermal gradient which is possibly related to the onset of Syrian Arc deformation. The similarity of the apatite age-depth relationship in the shallower Hameishar 1 borehole to that in the upper part of the Ramon 1
profile is indicative of the regional nature of the cooling event.
some 58°C is estimated for rocks at a present depth of 1475-1487 m. Most of the cooling (about 40 °C), which had already taken place by ca 80 M.Y.B.P., is attributed to a decrease in thermal gradient which is possibly related to the onset of Syrian Arc deformation. The similarity of the apatite age-depth relationship in the shallower Hameishar 1 borehole to that in the upper part of the Ramon 1
profile is indicative of the regional nature of the cooling event.
| Original language | English |
|---|---|
| Pages (from-to) | 115-124 |
| Number of pages | 10 |
| Journal | Israel Journal of Earth Sciences |
| Volume | 37 |
| State | Published - 1988 |