▁average ▁of ▁ 0 . 4 4 %. ▁The ▁Mill en ni um ▁er u ption ▁was ▁thus ▁thought ▁to ▁have ▁em itted ▁an ▁enorm ous ▁mass ▁of ▁vol at iles ▁into ▁the ▁str atos phere , ▁potentially ▁resulting ▁in ▁a ▁major ▁clim atic ▁impact . ▁ ▁Ch lor ine ▁ ▁McC ur ry ▁used ▁an ▁electron ▁micro pro be ▁to ▁analyze ▁the ▁vol atile ▁in ▁glass ▁inclusion ▁of ▁f eld s par . ▁McC ur ry ▁concluded ▁that ▁Mill en ni um ▁er u ption ▁may ▁have ▁released ▁ 2 0 0 0 ▁M t ▁Cl . ▁Li u ▁used ▁chrom at ography ▁to ▁analyze ▁the ▁average ▁of ▁vol atile ▁of ▁ 5 ▁whole - rock ▁samples , ▁and ▁the ▁contents ▁of ▁hal ogen ▁is ▁ 0 . 0 8 % – 0 . 1 1 %. ▁A ▁more ▁recent ▁and ▁more ▁detailed ▁study ▁by ▁Horn ▁and ▁Sch min cke ▁( 2 0 0 0 ) ▁used ▁an ▁ion ▁pro be ▁to ▁analyze ▁the ▁average ▁of ▁vol atile ▁in ▁ 6 ▁of ▁matrix ▁glass ▁and ▁ 1 9 ▁m elt ▁inclus ions , ▁and ▁the ▁average ▁of ▁content ▁of ▁Cl ▁in ▁m elt ▁inclus ions ▁and ▁matrix ▁glass ▁were ▁found ▁to ▁be ▁ 0 . 4 7 6 2 % ▁and ▁ 0 . 3 8 5 3 %, ▁respectively . ▁Horn ▁and ▁Sch min cke ▁concluded ▁that ▁the ▁Mill en ni um ▁er u ption ▁may ▁have ▁released ▁ 4 5 ▁ ± ▁ 1 0 ▁M t ▁of ▁Cl .