The Genesis of Oceanic Impact Craters and Impact-Generated Tsunami Deposits

Goto, Kazuhisa

doi:10.1016/b978-0-444-51552-0.00016-3

Cited by 3 publications

(2 citation statements)

References 52 publications

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“…A summary of impact‐generated tsunamis is given by Ward and Asphaug (1999), Dypvik and Jansa (2003), Dypvik et al. (2004), and Goto (2008). The Rochechouart impact energy exceeded the energy of the largest man‐witnessed terrestrial earthquake (Valdivia, Chile, May 22, 1960; Richter scale magnitude 9.5 and a released energy of ∼1.12 × 10 19 J), capable of producing major seismic waves in the Earth’s crust and tsunami waves in the sea.…”

Section: Discussionmentioning

confidence: 99%

“…Numerical modeling suggested that the Latest Jurassic marine impact that created the approximately 40 km Mjølnir impact structure in the Barents Sea off Norway also triggered a large tsunami (Shuvalov et al 2002;Glimsdal et al 2007). A summary of impact-generated tsunamis is given by Ward and Asphaug (1999), Dypvik and Jansa (2003), Dypvik et al (2004), and Goto (2008). The Rochechouart impact energy exceeded the energy of the largest man-witnessed terrestrial earthquake (Valdivia, Chile, May 22, 1960; Richter scale magnitude 9.5 and a released energy of 1.12 · 10 19 J), capable of producing major seismic waves in the Earth's crust and tsunami waves in the sea.…”

Section: Seismites and Tsunami Deposits Associated With The Rochechoumentioning

confidence: 99%

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A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Schmieder

Buchner

Schwarz

et al. 2010

Meteorit & Planetary Scien

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Abstract-40 Ar ⁄ 39 Ar dating of potassium feldspar (primary spherulitic-blocky and secondary idiomorphic K-feldspar) separated from impact-metamorphosed gneiss found near Videix in the western central part of the Rochechouart impact structure (NW Massif Central, France) yielded a Rhaetian combined age of 201 ± 2 Ma (2r), indistinguishable within uncertainty from the age of the Triassic ⁄ Jurassic boundary. Ballen quartz intergrown with the primary K-feldspar indicates post-shock temperatures exceeding approximately 1000°C that affected the precursor gneiss. Geochemically, both feldspar types represent essentially pure potassium end-members. Apart from the approximately 15 km diameter impact deposit area, the youngest crystallization age known for basement rocks in this part of the Massif Central is approximately 300 Ma. No endogenic magmatic-thermal events are known to have occurred later in this region. The K-feldspar recrystallized from local feldspar melts and superimposed post-shock hydrothermal crystallization, probably within some thousands of years after the impact. It is, therefore, suggested that the 40 Ar ⁄ 39 Ar age for the Videix gneiss (as a potassic ''impact metasomatite'') dates the Rochechouart impact, in consistence with evidence for K-metasomatism in the Rochechouart impactites. The new age value is distinctly younger than the previously obtained Karnian-Norian age for Rochechouart and, thus, contradicts the Late Triassic multiple impact theory postulated some years ago. In agreement with the paleogeographic conditions in the western Tethys domain around the Triassic ⁄ Jurassic boundary, the near-coastal to shallow marine Rochechouart impact is compatible with the formation of seismites and tsunami deposits in the latest Triassic of the British Isles and possible related deposits in other parts of Europe.

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Section: Discussionmentioning

confidence: 99%

Section: Seismites and Tsunami Deposits Associated With The Rochechoumentioning

confidence: 99%

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Schmieder

Buchner

Schwarz

et al. 2010

Meteorit & Planetary Scien

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Paleotsunami Research—Current Debate and Controversies

Scheffers

2015

Coastal and Marine Hazards, Risks, and Disasters

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Sedimentology of Tsunamiites Reflecting Chaotic Events in the Geological Record—significance and Problems

Shiki¹,

Tachibana

2008

Tsunamiites

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The Genesis of Oceanic Impact Craters and Impact-Generated Tsunami Deposits

Cited by 3 publications

References 52 publications

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Paleotsunami Research—Current Debate and Controversies

Sedimentology of Tsunamiites Reflecting Chaotic Events in the Geological Record—significance and Problems

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The Genesis of Oceanic Impact Craters and Impact-Generated Tsunami Deposits

Cited by 3 publications

References 52 publications

A Rhaetian40Ar/39Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

A Rhaetian40Ar/39Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

Paleotsunami Research—Current Debate and Controversies

Sedimentology of Tsunamiites Reflecting Chaotic Events in the Geological Record—significance and Problems

Contact Info

Product

Resources

About

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record

A Rhaetian⁴⁰Ar/³⁹Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record