Late Proterozoic evolution of the northern part of the Hamisana zone, northeast Sudan: constraints on Pan-African accretionary tectonics

Article Abstract:

Regional distribution and structural relations of rock assemblages in the Red Sea Hills,northeast Sudan, are examined using both field data and Landsat images. Late Proterozoic accretion in the Arabian-Nubian shield is indicated. Terrane accretion was followed by the formation of the Hamisana zone, a prominent feature characterized by crustal shortening and steep folds and thrust faults. Intra-arc deformation was contemporaneous with calc-alkaline magmatism, followed by post-contraction thrust fault reactivation. A model of protracted accretion and crustal thickening is proposed.

Sudan, Proterozoic Eon

---

Timing of Cenozoic extensional tectonics in west Turkey

Article Abstract:

Research describing the timing of Cenozoic extensional tectonics is presented. The study focused on the evolution in west Turkey, which was conditioned by K-Ar geochronology from acidic volcanic rocks and tourmaline leucogranite dykes. Formations of the Gordes Neogene sedimentary basin cut through the Izmir-Ankara suture zone and the Neogene sediments. Findings show that the initial compressional regime was replaced by extensional tectonics in the period ranging from the latter part of the Oligocene to early Miocene.

Turkey, Cenozoic Era

---

Early to mid-Cretaceous tectonics and unconformities of the Wessex Basin (southern England)

Article Abstract:

Unconformities in the rock structures of the Wessex Basin of southern England were subjected to studies to determine the cause of their formation and determine any relation to tectonic activities. Methods of study employed were sediment distribution analysis and isopach mapping, time-subsidence plots, seismic data and outcrop analysis. The conclusion of the study was that certain unconformities found were due to tectonic activities while others were due to rapidly-changing sea levels.

United Kingdom, Sea level, Cretaceous period, Sedimentation and deposition, Deposition (Geology)

Similar abstracts:

• Abstracts: Early Jurassic deformation in the Pine Forest Range, northwest Nevada, and implications for Cordilleran tectonics
• Abstracts: Tectonic evolution of the Priest River complex, northern Idaho and Washington: A reappraisal of the Newport fault with new insights on metamorphic core complex formation
• Abstracts: Slab in the wrong place: lower lithospheric mantle delamination in the last stage of the Eastern Carpathian subduction retreat: comment and reply
• Abstracts: Winter and summer temperatures of the early middle Eocene of France from Turritella delta 18O profiles: comments and reply
• Abstracts: The role of neighborhood competition in the spacing and diversity of ant communities. Regulation of "momentary" diversity by dominant species in exceptionally rich ant communities of the Australian seasonal tropics

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.