Late Ordovician tunnel valleys in southern Jordan

Douillet, Guilhem Amin; Ghienne, Jean François; Géraud, Yves; Abueladas, A; Diraison, Marc; Al-Zoubi, A (2012). Late Ordovician tunnel valleys in southern Jordan. Geological Society Special Publications, 368(1), pp. 275-292. Geological Society 10.1144/SP368.4

[img] Text
Douillet_al_GSL_2012.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

TheUpperOrdovicianglacialrecordofsouthernJordan(AmmarFm.)essentiallycon- sists of palaeovalley infills and of a subordinate time-transgressive fluvial to shallow-marine suc- cession overstepping both the palaeovalleys and interfluvial areas. Valley size (depth, 60 – 160 m; width, 1–3 km), steep (20–508) margins, internal organization and depositional facies point to an origin as tunnel valleys. The tunnel valleys are infilled by either fluvioglacial sandstones or fluvio- deltaic coarsening-upward successions including fine-grained clayey sediments. Re-occupation of previous valleys is evident in places. At least three generations of tunnel valleys are inferred from cross-cutting relationships, although they most probably only reflect temporary standstills and minor re-advances related to the overall recession following the main glacial advance recorded in Saudi Arabia. Petrophysical measurements indicate that higher permeabilities are located in the glacially related strata (1.5 – 3 darcy in fluvioglacial infills), with a somewhat reduced porosity (22–28%) relative to the preglacial sandstones owing to a higher clay content, probably of diagenetic origin. Sandstone amalgamation, however, gives the fluvioglacial sandstones a high reservoir quality.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Douillet, Guilhem Amin

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0305-8719

Publisher:

Geological Society

Language:

English

Submitter:

Guilhem Amin Douillet

Date Deposited:

17 Jan 2018 16:35

Last Modified:

17 Jan 2018 16:35

Publisher DOI:

10.1144/SP368.4

BORIS DOI:

10.7892/boris.107062

URI:

https://boris.unibe.ch/id/eprint/107062

Actions (login required)

Edit item Edit item
Provide Feedback