[meteorite-list] Ultraviolet Space Rocks?

From: bernd.pauli at paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: 02 Oct 2010 12:19:58 UT
Message-ID: <DIIE.0000003A00005117_at_paulinet.de>

Hello All,

Here are some details from an abstract,

Cheers,

Bernd

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D.W.G. Sears, P.H. Benoit, and D.G. Akridge (1999) Thermoluminescence
and The Thermal History Of Meteorites (MAPS 34-4, 1999, A105, excerpts):


- the TL sensitivity of unequilibrated ordinary chondrites correlates
  with petrographic type and thus metamorphic history

- the TL sensitivity of type 3 chondrites correlates with a variety of indicators
  of metamorphic alteration such as mineral heterogeneity, volatile contents, and
  abundance of presolar grains

- TL sensitivity is the basis of the widely used subdivision
  of type 3 ordinary chondrites into types 3.0-3.9

- cathodoluminescence (CL) studies indicate that the TL sensitivity
  increases during metamorphism as glass crystallizes to feldspar

- the temperature and width of the induced TL peak are also related to thermal
  history. Thus peak temperature and width can be used for palaeothermometry.

Some conclusions based on such measurements:

- the CV and CO chondrites spent a longer time at lower temperatures than UOC

- the TL sensitivity of the comminuted matrix of regolith breccias is lower than
  that of the clasts due to the destruction of crystalline feldspar. Thus the matrix-
  to-clast TL sensitivity ratio provides a measure of regolith maturity (similar trend
  observed in lunar breccias and lunar soils)

- the HED meteorites, especially the eucrites, can be subdivided into petrographic
  types 1-6 using TL sensitivity and the types agree with those based on mineralogy.
Received on Sat 02 Oct 2010 08:19:58 AM PDT