Date: 16th — 18th May 2017
Field Trip Leader: Ahmed Masri, Ministry of Energy and Mineral Resources, Jordan
Field Trip Fee: $1200 (inclusive of flights, airport transfers, 2 night’s accommodation and F&B)
Booking deadline: 20th April 2017
The lower Paleozoic sequences, from Cambrian to the lower Silurian are well exposed in southern Jordan; to the east of Aqaba. These are divided into eight formations in Jordan; the lower four formations belong to the so called Ram Group of Cambrian-Middle Ordovician age, with a total thickness up to 700m. The Ram Group rests unconformably on the granitoid rocks of the Arabian Shield. These sequences are composed of medium to coarse fluvial sandstones dominated by trough cross-bedding; with short intervals of marine incursions during Cambrian and Early Ordovician times; these marine incursions are indicated by the presence of thin siltstone beds bearing Cruziana trace fossils and vertical Skolithos Burrows.
The succeeding four sequences belong to the Khrayim Group of Middle Ordovician-Silurian age, with a total thickness up to 600m. This group is well exposed to the east of Wadi Rum and composed of shallow marine siliciclastics (sandstone, shale and mudstone); where the sandstone beds dominated by trough cross-bedding and ripple marks with Cruziana trace fossils, Skolithos Burrows and Brachiopods; whereas the mudstone beds bearing different species of Graptolites, Brachiopods and different undefined fossils.
In the middle of the Khrayim Group, by the end of Ordovician, the area was subjected and underwent a glacial event, where deep incision of glacial valleys cut through the older sequences of Ordovician and refilled by flovio-glacial sediments, which are formed the tight gas reservoir in Risha Gas Field in northeast Jordan. Regional marine transgression occurred in the early Silurian led to the deposition of a thick mudstone sequence called "Hot Shale" in Saudi Arabia, which is the proven source rock of the hydrocarbons in the Arabian Plate.
Field Trip Agenda Overview:
Fly from Amman to Aqaba & over night at the Double Tree Hotel, Aqaba (flight departs at 9.15pm).
Travel from Aqaba to Wadi Rum and vicinity: Examine Cambrian and lower Ordovician sandstones. In general, fluvial sandstones facies.
Traditional dinner under the stars at Sun City Campsite. Return to the Double Tree Hilton, Aqaba.
Continue to the east investigating middle and upper Ordovician sandstone and shale intercalations up to the glacial sediments that forms reservoir in of the tight gas in Jordan. Then we will examine the lower Silurian shale (Hot shale in Saudi).
Return to Amman (flight departs at 6.55pm).
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