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Mineralogy of Dickite and Nacrite From Northern Taiwan

Published online by Cambridge University Press:  28 February 2024

Pei Yuan Chen ,
Ming Kuang Wang  and
Deng Shiu Yang
Pei Yuan Chen
Affiliation:
Department of Earth Science, National Taiwan Normal University, National Taiwan University, Taipei, Taiwan
Ming Kuang Wang*
Affiliation:
Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan
Deng Shiu Yang
Affiliation:
Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan
*
*E-mail address of corresponding author: mkwang@ccms.ntu.edu.tw
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Abstract

Nacrite and dickite are found in two localities in northern Taiwan. One, containing nacrite and dickite, is associated with a gold-enargite deposit as a vug-filling clay in the Chinkushih (CKS) mine district near the northern coast. The other is the occurrence of dickite in the interstices of a Miocene coarse-grained quartzose sandstone in the Nanshihchiao (NSC) area, near Taipei city. X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscope (SEM), and petrographic examinations were used to characterize the mineralogical features. Nacrite most often takes the unusual form of rhombic platelets, and dickite is commonly elongated in habit with the shapes possibly related to their origin. Based on geological evidence, we believe that both nacrite and dickite are of hydrothermal origin. In the CKS area, the formation of nacrite and dickite is related to the hypogene gold-enargite mineralization. In contrast, the transformation of dickite in the NSC area is due to the influence of the raised temperatures of sandstone formation, resulting from volcanic activity during the Kungkuan stage after the deposition of the sandstone.

Keywords

AlterationDickiteHydrothermalNacriteTaiwan
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 6 , December 2001 , pp. 586 - 595
Copyright
Copyright © 2001, The Clay Minerals Society

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