Thermal diagenesis of clay minerals within volcanogenic material from ODP Site 135-841, supplement to: Vitali, Frédéric; Blanc, Gérard; Larqué, Philippe; Duplay, Joelle; Morvan, Gilles (1999): Thermal diagenesis of clay minerals within volcanogenic material from the Tonga convergent margin. Marine Geology, 157(1-2), 105-125

Frédéric Vitali, Gérard Blanc, Philippe Larqué, Joelle Duplay & Gilles Morvan
Clay minerals are examined in detail in the sediment from the Tonga Trench margin at Site 841 (Leg 135 ODP). The changes in amount and nature of secondary clays with depth provide an alternative explanation for the intensive alteration of volcanogenic material at convergent margins. A characteristic distribution of clay minerals with depth shows four distinct zones unexplainable by simple burial diagenesis processes. These are named the upper, reactive, lower and rhyolitic zones. The reactive...
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