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- W3048804638 abstract "The oldest exposed rocks in the desert of SE Arabia comprise Precambrian to mid-Tertiary sedimentary sequences of the Oman Mountains (including ophiolites) and the Huqf area. The Oman Mountains are flanked by alluvial fans, which InfraRed Stimulated Luminescence (IRSL) dating shows were being formed up to more than 300 ka BP, and possibly extend back to the Plio-Pleistocene. Other ages indicate high rainfall sufficient to induce conglomerate transport during a possible interstadial (31 ka) and, at 15 ka, coeval with a late glacial event. The bioclastic-rich sands of aeolianites were derived from the floor of the continental shelf when it was exposed during late Quaternary glaciations. In the Emirates, these sands were transported from the Arabian Gulf area by northern (Shamal) winds during the build-up to the last glaciation (99 and 64 ka), whereas in SE Oman, deposition seems to have coincided with the last two interglacials (229 and 112 ka) when the SW Monsoon is believed to have been active in the Wahiba area. Lowering of the sea level coincided with a fall of the water table in current interdune sabkhas of the Liwa, and the exposure in mesas of dune sands whose deposition was coeval with the last two glaciations (140 and 40 ka). 12 ka dune sand was later cut by rhizoconcretion probably associated with the higher rainfall of the Climatic Optimum in what is now an interdune sabkha of the Liwa. The Umm as Samim, in Oman, was a lake 6 ka BP before an increase in aridity during the later Holocene converted it to a salt-polygon sabkha. The limited IRSL dates reported here provide a firm skeleton on which to hang the flesh of sedimentary structures indicative of a Late Quaternary climate that was continually changing." @default.
- W3048804638 created "2020-08-18" @default.
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- W3048804638 date "2020-08-26" @default.
- W3048804638 modified "2023-09-24" @default.
- W3048804638 title "Chronology and paleoenvironmental significance of Quaternary desert sediment in southeastern Arabia" @default.
- W3048804638 doi "https://doi.org/10.1201/9781003077862-33" @default.
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