▁Another ▁author , ▁Gu o , ▁who ▁studies ▁pet ro log y ▁and ▁ge och em istry , ▁shows ▁the ▁average ▁of ▁contents ▁of ▁Cl ▁in ▁m elt ▁inclus ions ▁and ▁matrix ▁glass ▁to ▁be ▁ 0 . 4 5 % ▁and ▁ 0 . 3 3 %, ▁respectively . ▁They ▁concluded ▁that ▁Mill en ni um ▁er u ption ▁may ▁have ▁released ▁ 1 0 9 . 8 8 ▁M t ▁of ▁Cl , ▁and ▁ 1 5 . 8 2 ▁into ▁the ▁str atos phere . ▁The ▁Cl ▁contents ▁in ▁the ▁m elt ▁inclus ions ▁are ▁similar ▁to ▁those ▁of ▁Mayor ▁Island , ▁and ▁higher ▁than ▁those ▁of ▁Tamb ora ▁( 0 . 2 1 1 % ), ▁Krak ata u ▁( 0 . 2 3 8 %) ▁and ▁Pin at ub o ▁( 0 . 8 8 – 0 . 1 0 6 %). ▁The ▁large ▁difference ▁of ▁results ▁between ▁Gu o ▁and ▁Horn ▁is ▁because ▁Gu o ▁used ▁higher ▁volume ▁and ▁density ▁of ▁mag ma . ▁ ▁Sul fur ▁dio x ide ▁ ▁Li u ▁used ▁chrom at ography ▁to ▁analyze ▁the ▁average ▁of ▁vol atile ▁content ▁of ▁five ▁p um ice ▁and ▁obs id ian ▁samples , ▁finding ▁the ▁contents ▁of ▁sul fur ▁to ▁be ▁ 0 . 0 4 1 5 %, ▁and ▁Li u ▁assumed ▁the ▁deg ass ing ▁efficiency ▁factor ▁of ▁sul fur ▁is ▁ 0 . 3 . ▁Li u ▁estimated ▁that ▁the ▁Mill en ni um ▁er u ption ▁may ▁released ▁ 4