Tagish Lake CI2
Meteorite Name
Tagish Lake
Fell January 8, 2000,  Canada
Weathering &
Shock Level
Fresh Fall
Specimen Type
1 polished thin section, 1 spc thin section
A brilliant fireball followed by loud detonations was widely observed over the Yukon Territory
and northern British Columbia.  The fireball was also detected by satellites in Earth orbit.  Dust
clouds from terminal fragmentation events were widely observed.  Jim Brook recovered
several dozen meteorites totaling ~ 1 kg on the ice of Taku Arm, Tagish Lake, on January 25
and 26 (coordinates of first find given above).  Between April 20 and May 8, ~ 500 additional
specimens were located on the ice of Taku Arm and a small, unnamed lake 1.5 km to the east,
but only ~ 200 were retrieved as many had melted down into the ice making their collection
time consuming; recovery was prioritized based on meteorites' mass and degree of
disaggregation.  The total mass collected was between 5 and 10 kg.  The strewnfield is at
least 16 × 3 km, oriented approximately S30° E.  Classification and mineralogy (M. Zolensky,
JSC; M. Grady, NHM):  possibly CI2 group; a matrix-dominated chondrite, with a few small
chondrules, CAIs, and isolated grains; matrix mainly phyllosilicates, Fe-Ni sulfides and
magnetite, with abundant Ca-Mg-Fe carbonates; olivine, Fa0–29, PMD = 2%, with a peak at
Fa1; pyroxene, Fs1–7, PMD = 2%, with a peak at Fs2; bulk C content 5.4 wt%, with δ13C =
+24.3‰; shock stage, S1.  Oxygen isotopes (R. Clayton, UChi):  δ18O = +18.0–19.0‰, δ17O
= 8.3–9.2‰.  

Image tagish-1

Image tagish-2

Image tagish-4

Image tagish-3
Copyright 2008
Copyright 2008
Copyright 2008
Copyright 2008