% ▁proportion ▁of ▁the ▁com end it ic ▁mag ma ), ▁whereas ▁it ▁is ▁ 1 9 0 0 ▁p pm ▁F ▁for ▁m elt ▁inclusion ▁and ▁F - po or ▁matrix ▁glass ▁( 3 6 % ▁proportion ▁of ▁the ▁com end it ic ▁mag ma ). ▁Horn ▁concluded ▁that ▁ 4 2 ▁ ± ▁ 1 1 ▁M t ▁of ▁F ▁was ▁released ▁by ▁the ▁er u ption . ▁Gu o , ▁based ▁on ▁less ▁samples ▁( 9 ▁inclus ions ▁and ▁ 3 ▁matrix ▁glass ), ▁calculated ▁that ▁F ▁contents ▁in ▁inclus ions ▁and ▁matrix ▁glass ▁are ▁ 0 . 4 2 % ▁and ▁ 0 . 2 1 %, ▁respectively . ▁Gu o ▁concluded ▁that ▁ 1 9 6 . 8 ▁M t ▁of ▁flu or ine ▁was ▁released ▁from ▁er u ption , ▁with ▁ 2 8 . 3 4 ▁M t ▁of ▁F ▁inject ed ▁into ▁the ▁str atos phere . ▁With ▁mag ma ▁evol ving , ▁hal ogen ▁contents ▁increase ▁irregular ly , ▁parallel ▁to ▁the ▁increase ▁of ▁Si O 2 ▁concentr ations ▁in ▁glass ▁inclus ions ▁The ▁large ▁difference ▁of ▁results ▁between ▁Gu o ▁and ▁Horn ▁is ▁because ▁Gu o ▁used ▁a ▁higher ▁volume ▁and ▁density ▁of ▁mag ma , ▁and ▁higher ▁difference ▁contents ▁between ▁matrix ▁glass ▁and ▁inclus ions . ▁ ▁V apor ▁phase ▁ ▁Sul fur ▁is ▁not ▁strongly ▁en rich ed ▁during ▁different iation , ▁in ▁contrast ▁to ▁water , ▁ch lor ine , ▁and ▁flu or ine . ▁The ▁reason ▁could ▁be ▁pre