Sedimentation and crustal recycling along an active oblique-rift margin: Salton Trough and northern Gulf of California

摘要: Transtensional basins embedded in the San Andreas fault system of Southern California (United States) and northwestern Mexico are fi lled with sediment derived from Colorado River, which drains a large area western U.S. interior. The is rapidly buried, heated, mingled intrusions deep to form new generation recycled crust along active plate boundary. Using range values for total basin depth, relative volume mantle-derived intrusions, composition early rift deposits, River‐derived bracketed between 2.2 3.4 ◊ 10 5 km 3 , similar rock that likely was eroded River catchment over past 5‐6 m.y. volumetric rate crustal growth by sedimentation ~80‐130 /m.y./km, comparable rates subductionrelated island arcs slow seafl oor spreading centers. Sedimentary basinal processes thus play major role evolution recycling this setting, may be important at other rifted margins where river captured following tectonic collapse prerift orogenic highland.