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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24825

Title: Processes of hydrothermal alteration of andesite
Authors: Li-Jun Li;Jiann-Neng;Huann-Jih Lo;Sheng-Rong Song;Chi-Yu Lee;Yaw-Lin Chen;I-Chieh Lin;Huei-Fen Chen;Ya-Jiun Liu
Contributors: NTOU:Institute of Applied Geosciences
Keywords: hydrothermal alteration;andesite;α-cristobalite;dissolution;disintegration
Date: 2002
Issue Date: 2011-10-20T08:17:47Z
Publisher: Western Pacific Earth Sciences
Abstract: abstract:Hydrothermal experiments on andesite alteration have been attempted under the condition of 110°C. to 190°C., autogeneous pressures, 0.05 M to 2 M H2SO4 solution, keeping renewal of acid solution every six hours.
Experimental results show that chemical reaction begins from the surface, and then diffuses inward in every rock chip. The rock chips become finer and finer as loose fine-grained materials appear in association with them. These materials are constituted of α-cristobalite, pyroxenes and groundmass in the early stage, and essentially of α-cristobalite in longer runs. The weight of residual chips decreases with increasing duration of experiments, while the amounts of SiO2 and K2O increase, but those of the other oxides decrease with increasing cumulative time. In the meantime, remains of strongly reacted plagioclase become silica-rich materials.
It is considered that dissolution, disintegration and rapid transformation of silica-rich residues to α-cristobalite are the three essential processes of the hydrothermal alteration of the andesitic rocks.
Relation: 2(3), pp.319-330
URI: http://ntour.ntou.edu.tw/handle/987654321/24825
Appears in Collections:[應用地球科學研究所] 期刊論文

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