DTIC ADA071508: Shock Effects in Carbonates.

	DTIC ADA071508: Shock Effects in Carbonates.
	by Defense Technical Information Center
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	Permanent deformation of very small crystallites of
	carbonate minerals, such as those occurring in the
	Eniwetok core, has been examined using the following
	techniques: (a) Peak broadening of X-ray powder
	diffractometer patterns due to decreasing effective grain
	size with increasing shock deformation is observed. This
	effect is clearly seen in the core material taken from
	directly under the Cactus explosion. (b) Angular strain
	in calcite single crystals has been observed in Debye-
	Scherrer patterns of laboratory shocked samples and
	single-crystallities from the Eniwetok core. Tentative
	peak shock pressures of approximately 8 kbar at a depth
	of approximately 15 m decaying the approximately 3 kbar
	at a depth of approximately 30 m are inferred on the
	basis of very preliminary data. (c) Shock-induced erasure
	of defect spectra, as examined by electron-spin resonance
	(ESR) techniques, is observed in carbonate materials,
	both shocked in the laboratory and by the Cactus
	explosion. This effect is yet 'uncalibrated.' (d) Also
	using the ESR techniques, a systematic loss of fine
	structure of the resonance of Mn(++) impurities in
	calcite is observed with increasing shock pressure, both
	in laboratory shocked samples and those in the Cactus
	core. (Author)

	Date Published: 2017-09-21 06:49:02
	Identifier: DTIC_ADA071508
	Item Size: 19060976
	Language: english
	Media Type: texts

	# Topics
	DTIC Archive; Vizgirda,Joana; CALIFOR...

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