Alpha thermochronology of carbonates

Details Alpha thermochronology of carbonates Alpha thermochronology of carbonates

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.4488c&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 71, Issue 18, p. 4488-4511.

Physics

3

Scientific paper

Step-heating experiments on 17 calcites from 11 different samples and 6 dolomites from 5 samples suggest a closure temperature of He in carbonates ˜70 ± 10 °C for a cooling rate of 10 °C/m.y. The bulk closure temperature in some samples may tend slightly higher due to the presence of diffusion domains larger (and therefore more retentive) than the sites in which the majority of He resides. The diffusivity of He in calcite is independent of the genesis of the mineral (igneous, sedimentary, metamorphic) or the source of the He (radiogenic, common, or laboratory induced) and in all samples analyzed the effective diffusion dimension for He is smaller than the size of the crystals investigated. Although calcite is a low-U mineral, this shortcoming can be overcome by analyzing large samples (>2 mm diameter) provided samples have a minimum of ˜0.3 ppm U; samples with smaller concentrations of alpha-producers are unlikely to produce enough radiogenic 4He sufficient to overwhelm He present in the crystals at the time they passed through their closure temperature.

Affiliated with

Also associated with

No associations

Rating

Alpha thermochronology of carbonates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Alpha thermochronology of carbonates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alpha thermochronology of carbonates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-965629