Changes

Most of the Asian terranes, mainly located immediately north of the equator, were still separated by seaways before their collision with and incorporation into Pangea. The position and vergence of subduction among these blocks is not clear, and different models have been proposed.<ref name=Stampfliandborel_2002 /> <ref name=Torsvikandcocks_2004 /> <ref name=Rubanetal_2007 /> <ref name=Vonraumerandstampfli_2008 />

Most of the Asian terranes, mainly located immediately north of the equator, were still separated by seaways before their collision with and incorporation into Pangea. The position and vergence of subduction among these blocks is not clear, and different models have been proposed.<ref name=Stampfliandborel_2002 /> <ref name=Torsvikandcocks_2004 /> <ref name=Rubanetal_2007 /> <ref name=Vonraumerandstampfli_2008 />

During Early Devonian time, a global sea-level fall was responsible for the reduction of the neritic belts. The occurrence of a wide depositional hiatus close to the Early Devonian in most of the Middle East is ascribed to this sea-level low-stand, probably enhanced by a tectonic uplift.<ref name=Rubanetal_2007 />. The middle latitude position of North Africa and part of Arabia favored the development of alluvial deposits. Tectonic activity was weak and limited volcanic flows are documented<ref name=Meneissy_1990>Meneissy, M. Y., 1990, Vulcanicity, in R. Said, ed., The Geology of Egypt: Balkema, Rotterdam, p. 157–172.</ref> mainly in Sudan and in the southern area of the Eastern Desert of Egypt.<ref name=Schandelmeierandreynolds_1997 />

During Early Devonian time, a global sea-level fall was responsible for the reduction of the neritic belts. The occurrence of a wide depositional [[hiatus]] close to the Early Devonian in most of the Middle East is ascribed to this sea-level low-stand, probably enhanced by a tectonic uplift.<ref name=Rubanetal_2007 />. The middle latitude position of North Africa and part of Arabia favored the development of alluvial deposits. Tectonic activity was weak and limited volcanic flows are documented<ref name=Meneissy_1990>Meneissy, M. Y., 1990, Vulcanicity, in R. Said, ed., The Geology of Egypt: Balkema, Rotterdam, p. 157–172.</ref> mainly in Sudan and in the southern area of the Eastern Desert of Egypt.<ref name=Schandelmeierandreynolds_1997 />

[[file:M106Ch01Fig05.jpg|thumb|300px|{{figure number|5}}Global paleogeography (top) and major depositional settings in the southern margin of the Tethys (below) during Early Permian time (about 290 Ma).]]

[[file:M106Ch01Fig05.jpg|thumb|300px|{{figure number|5}}Global paleogeography (top) and major depositional settings in the southern margin of the Tethys (below) during Early Permian time (about 290 Ma).]]