The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure: Results from the Eyreville Core Holes

Petrology of impact melt rocks from the Chesapeake Bay crater, USA
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Published:January 01, 2009
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CiteCitation
Axel Wittmann, Ralf T. Schmitt, Lutz Hecht, David A. Kring, W. Uwe Reimold, Harold Povenmire, 2009. "Petrology of impact melt rocks from the Chesapeake Bay crater, USA", The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure: Results from the Eyreville Core Holes, Gregory S. Gohn, Christian Koeberl, Kenneth G. Miller, Wolf Uwe Reimold
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The Eyreville B drill core in the inner annular moat of the 85-km-diameter Ches-apeake Bay impact structure recovered the first coherent impact melt volumes from within the crater as two bodies, 1 and 5.5 m thick. This study focuses on the petrogenesis of these well-preserved rocks. Mixing calculations reveal that the chemical composition of these melts can be modeled as a hybrid of ~40% sedimentary target and ~60% crystalline basement component. The melt rocks contain abundant lithic and mineral clasts that display all stages of shock metamorphism. Zircon clasts record the cooling of the melt from temperatures above 1700 °C...
- Cenozoic
- chemical composition
- Chesapeake Bay impact structure
- cores
- electron probe data
- Eocene
- genesis
- impacts
- International Continental Scientific Drilling Program
- melts
- metamorphism
- Northampton County Virginia
- Paleogene
- petrography
- Raman spectra
- shock metamorphism
- spectra
- temperature
- Tertiary
- United States
- upper Eocene
- Virginia
- Eyreville Farm