Mahmoud Abbas

• PhD Quaternary Geology
• Researcher and lecturer at Jiaying University

In this paper, the “Aqaba Formation” formed at the margins of the Aqaba Gulf, during the Quaternary, is sedimentologically studied. This formation consists mainly of clayey beds intercalated with friable silty, medium to coarse-grained sandstones, commonly with planar cross bedding, bioturbated by vertical burrows, and poorly cemented polymict cong...

Former lakes and wetlands can provide valuable insights to the late Pleistocene environments encountered by the first humans to enter the Levant from Africa. Fluvial incision along Wadi Gharandal in hyperarid southern Jordan has exposed remnants of a small riverine wetland that accumulated as a sedimentary sequence up to ~ 20 m thick. We conducted...

Homo sapiens dispersed from Africa into Eurasia multiple times in the Middle and Late Pleistocene. The route, across northeastern Africa into the Levant, is a viable terrestrial corridor, as the present harsh southern Levant would probably have been savannahs and grasslands during the last interglaciation. Here, we document wetland sediments with l...

In 2019 a sinkhole (doline) occurred in Late Devensian till above fissured limestone in northern England. Most sediment plugging the fissure was evacuated down into a karstic drainage system. The residual sedimentary fill comprises three main lithofacies, dated using optically stimulated luminescence to between 170.7 ± 40.0 and 56.1 ± 13.5 ka. The...

Soft-sediment deformation structures (SSDSs) typically form in unconsolidated sedimentary deposits before lithification. Understanding these structures involves evaluating their characteristics, genesis timing, and the dynamics of sediment deformation. SSDSs are essential for deciphering ancient environments, reconstructing depositional processes,...

A reliable chronology is essential to understand deltaic sedimentation processes in response to sea-level fluctuations and climatic changes. In the Pearl River Delta (PRD), high-resolution chronostratigraphy is still limited which hinders the detailed interpretation of sedimentary history. In this study, optically stimulated luminescence (OSL) dati...

Shale pore evolution and variation are very important for evaluating shale reservoirs. In this study, hydrous pyrolysis experiments in a semiclosed system, low-pressure gas (N2 and CO2) adsorption, X-ray diffraction, organic petrography, and geochemistry experiments were applied on upper Permian organic-rich shale from Dalong Formation, Sichuan Bas...

The neritic region of the Chaoshan plain is located on the northeastern (NE) boundary of the South China Sea (SCS). Despite the extensive research on the stratigraphic architecture and sedimentary processes within the Chaoshan plain, the neighboring neritic area remains largely unexplored. In this study, we provide a new set of ages on seventeen qu...

Deltaic sediments provide a window for investigating delta development processes and the effects of human activities. Despite the fact that numerous studies have been conducted in the Pearl River Delta (PRD), the chronological data are still very limited, which hinder the detailed interpretation of the sedimentary records. The current study aims to...

Accurate chronology plays a crucial role in reconstructing delta evolution. Radiocarbon (¹⁴C) and optically stimulated luminescence (OSL) dating are widely used to establish a stratigraphic chronology of the late Quaternary sediments. The Chaoshan plain is located on the southern coast of China and borders the South China Sea. The thickness of Quat...

The southwestern coast of the Bohai Sea is a favorable area to study land-sea interactions and palaeoenvironmental changes. The Bohai Sea hosts vast volumes of sediment discharged from rivers of mainland China and has undergone large-scale sea-level fluctuations during the Quaternary. Three transgressions have been previously determined for the Boh...

The highlights of the 2nd TSMO season:  Collection of 22 charcoal samples from trilith heaths across Oman for radiocarbon dating of the last time of use (terminus ante quem).  Collection of 7 OSL samples beneath trilith platform stones in Duqm and Ẓufār for OSL dating when trilith monuments were built (terminus post quem).  New recording of tw...

The paleohydrology and geomorphology of southeastern Arabia after 130 ka suggests complex climatic records in the area considered a potential route for human dispersal Out of Africa. Understanding the past hydrological systems is essential to relate the lithic assemblages at the surface to a habitable environment. Climatic records such as speleothe...

Quaternary studies are very limited in Jordan, even though this area (including the Dead Sea drainage and desert) is a focus for such studies. Lacustrine archives in Jordan allow reconstruction of past climate conditions. We carried out an intense investigation on late Pleistocene lake sediments in Jordan Rift Valley and Jordanian Plateau with sect...

The bottom surface sediments at the southern part of the Jordanian coast of the Gulf of Aqaba have been studied. Samples were collected from 10 m depth at nine coastal stations which are located within two main zones: Marine Park Zone and Industrial Zone. Sedimentation rate, grain size oxygenation state, Loss on Ignition, hydrogen sulfide, calcium...

Geological, geochemical, and geochronological approaches were implemented to investigate the geological characteristics and the paleoenvironment of the Pleistocene deposits of Hamra Faddan area in southern Jordan. These sediments Faddan were attributed to the Lisan Marl Formation. The current study investigated the possessing characteristics of the...