Lecture_8_Provenance

Source areas plutonic igneous metamorphic sedimentary

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Tectonic SePngs of Source Areas Continental Block Proven Recycled Orogen Provenances Magmatic Arcs Con:nental Block Provenances •  Cores of grani:c rock, ancient orogenic belts, regional metamorphism; mostly cover by thin sedimentary strata •  Rimmed by ac:ve and passive plate margins •  Source areas: plutonic igneous, metamorphic & sedimentary rocks •  Sediment yield –  –  –  –  Quartz (plutonic) Alkali Feldspar (K- spar) Sedimentary rock fragments (esp. chert) Metamorphic rock fragments •  Common sediment/rock types –  Quartzarenite –  Subarkose –  Arkose (Alkaline) Recycled Orogen Provenances •  Zones of convergent plate margins •  Recycled sedimentary and metasedimentary con:nent margin deposits •  Source areas: plutonic igneous, metamorphic & sedimentary •  Sediment yield –  Sedimentary rock fragments (esp. chert) –  Moderate amounts of quartz –  Alkali Feldspar (K- spar) •  Common sediment/rock types –  Subarkose –  Sublitharenite Magma:c Arc Provenances •  Zones of plate convergence with arc terrane •  Volcanogenic highlands source areas •  Sediment yield –  Plagioclase Feldpar (Na to Ca) –  Igneous rock fragments –  Sedimentary & Metamorphic rock fragments •  Common sediment/rock types –  –  –  –  Arkose (Plagioclase) Lithic Arkose Feldspathic Litharenite...
View Full Document

Ask a homework question - tutors are online