Please use this identifier to cite or link to this item:
|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|
|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|
|Appears in Collections:||[應用地球科學研究所] 期刊論文|
Files in This Item:
There are no files associated with this item.
All items in NTOUR are protected by copyright, with all rights reserved.