The passive margin of the Guiana Shield formed at junction Central and Equatorial Atlantic Oceans that developed successively by a complex rifting process achieved final dispersal Western Gondwana. Yet, resulting spatial distribution crustal thinning along remains to be mapped its controlling parameters deciphered. We used subsurface data map variability margin. show segments width primarily de...

Chemical weathering, as well as physical erosion, changes the composition and shapes the surface of the continental crust. However, the amount of continental material that has been lost over Earth's history due to chemical weathering is poorly constrained. Using a mass balance model for lithium inputs and outputs from the continental crust, we find that the mass of continental crust that has be...

This study investigates petrology and major, minor, and rare earth elements ‎geochemistry of ‎East Iranian Eocene–Oligocene volcanic rocks in Sistan suture ‎zone, to examine their ‎petrogenesis and magma evolution. The volcanic rocks include andesite, trachy-andesite, dacite ‎and rhyolite. ‎These calc-alkaline rocks of high-K series are enriched in Large ‎Ion Lithophile ‎Elements of Rb and Ba a...

This study investigates the provenance and tectonic background of lower Silurian Longmaxi Formation black shale Yanyuan Basin in western Kangdian ancient land provides guidance for gas exploration development area. The mineral petrological geochemical characteristics this area have been studied detail. is mainly a passive continental margin environment, but also has attributes an active island ...

Abstract We investigated the continent-ocean transition (COT) structure of three main marginal seas in western Pacific Ocean (South China Sea, Coral and Woodlark Basin) to determine tectono-magmatic processes acting during continental breakup. The COT formed from activity a low-angle normal fault system localizing deformation final rifting. Extension was contemporaneous with magmatic activity, ...

Leg 149 is scheduled to core a transect of holes across the ocean-continent transition (OCT) off western Iberia to determine the changes in the physical and petrological nature of the acoustic basement. Four sites that span the OCT have been chosen on basement highs to enable penetration of basement at each site to several hundred meters. It is anticipated that, at most, three of these sites wi...