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A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

Published on: June 28, 2015

A late Triassic impact ejecta layer in southwestern Britain.

Gordon Walkden¹, Julian Parker, Simon Kelley

¹Department of Geology and Petroleum Geology, Kings College, University of Aberdeen, Aberdeen AB24 3UD, UK. spherules@abdn.ac.uk

Science (New York, N.Y.)

|November 16, 2002

Summary

Researchers discovered a Triassic impact ejecta layer in Britain containing spherules and shocked quartz. This finding provides crucial evidence for extraterrestrial impacts during the Mesozoic era.

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Area of Science:

Geology
Planetary Science
Paleontology

Background:

Terrestrial impact craters are well-documented, but associated distal ejecta deposits are rare in sedimentary records.
Understanding impact events requires identifying and characterizing their ejecta layers.

Purpose of the Study:

To report the discovery of a significant Triassic impact ejecta deposit in southwestern Britain.
To date the ejecta layer and correlate it with known impact structures.
To analyze the implications of this discovery for understanding Mesozoic impacts and extinctions.

Main Methods:

Geological fieldwork in southwestern Britain to identify and sample sedimentary deposits.
Microscopic analysis to identify characteristic impact spherules and shocked quartz.
Argon-argon dating of potassium feldspar within the ejecta layer.

Main Results:

Identification of a Triassic sedimentary deposit containing spherules and shocked quartz, indicative of an impact ejecta layer.
Argon-argon dating yielded an age of 214 +/- 2.5 million years for the deposit.
The age aligns with several Triassic impact craters, notably Manicouagan and Rochechouart.

Conclusions:

The discovered deposit represents a rare sedimentary record of a Mesozoic extraterrestrial impact.
This finding aids in deciphering the frequency, effects, and dynamics of impact events.
Further research can explore the relationship between this ejecta layer and the timing of fossil extinctions.