rsl asl sub dep
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Stratigraphic Interpretation
Creation of strata and their character can be essentially thought of as a competition of creating and filling space for sediment.
Accommodation Deposition
∆RSL = ∆ASL + Sub - Dep
∆RSL: Change in Relative Sea Level ∆ASL: Change in Absolute Sea Level (Eustasy) Sub: Subsidence Rate (or uplift rate) Dep: Deposition Rate (or erosion rate)
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Time Scales of Accommodation-Creating Processes 10-4 10-5
10-6
10-3 10-2 10-1
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What Controls Sealevel? Eustatic Sealevel is a function of ocean water volume and the
shape of the ocean basin… These shapes fill differently &
Global Hypsometric Curve
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Ice Volume & Sealevel Change Changes in volumes of water stored as ice in Earth’s great
continental ice sheets (Greenland & Antarctica, today) changes global ocean water volume…
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Phanerozoic Sea Level
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Subsidence
The downward vertical motion of Earth’s surface with respect to a global datum.
3 Types - Flexural Subsidence - Thermal Subsidence - Extensional Subsidence
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Cambrian
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Devonian
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Mississippian
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Permian
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Triassic
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Cretaceous
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Tertiary