Lecture_8_Provenance - Provenance Lecture Outline I.Uses of...

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Provenance Lecture Outline I.Uses of grain mineral suites II.Overview of tectonic settings III.Characteristic mineral assemblages Reading Assignment: Boggs, Chapter 5, p. 139-145
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Uses of Grain Mineral Suites Grain mineralogy is the primary tool for determining source area or “provenance” Many applications Source of basinal sediments Basin record of tectonic events – “unroofing” Transport corridors - “source to sink” Mode of transport Climatic conditions Paleographic reconstructions
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Ex: Sourcing Mesozoic Aeolian Sands
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Ex: Sourcing Mesozoic Aeolian Sands
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Oceanic & Continental Lithosphere
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Transform Divergent Convergent Three Main Types of Plate Boundaries
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Divergent Boundaries Zones of upwelling mantle Produces new oceanic lithosphere Mafic volcanism and shallow earthquakes Example: Mid-Atlantic Ridge, East African Rift
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Transform Boundaries Conservative margins are found where two plates slide past each other Usually areas of frequent shallow earthquakes, but little volcanism
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Convergent Boundaries Subduction of heavier lithosphere; continental collisions Subduction – volcanic arcs, coastal mountain ranges, shallow-deep earthquakes, Continent Collisions - Interior orogenic belts, shallow-deep earthquakes (Ocean-Ocean) (Continent-Continent) (Ocean-Continent)
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What Do Continents Consist Of? – Reflections of Their Growth Magmatic Differentiation Accretion of Arcs, Terranes, Continents
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Metamorphism Sites
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North American Continent Active Margin: Orogenic belt,
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Lecture_8_Provenance - Provenance Lecture Outline I.Uses of...

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