| Sub—microscopic Textures and Retrogressive Metamorphic Origin of Longxi Nephrite |
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| 引用本文： | 王春云,任国浩,等.Sub—microscopic Textures and Retrogressive Metamorphic Origin of Longxi Nephrite[J].中国地球化学学报,1990,9(2):182-187. |
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| 作者姓名： | 王春云 任国浩 |
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| 作者单位： | [1]InstituteofGeochemistry,AcademiaSinica [2]WuhanUniversityofTechnology,AcademiaSinica |
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| 摘 要： | Nephrite specimens from Longxi,sichuan,prepared by ion-thinning and dispersion techniques have been studied using TEM and SAED.A series of sub-microscopic textures such as (010)multiple-chain faults and related fault terminations.(001)mechanical twinning,sub-grain boundaries or fault walls,tremolite fibrous pseudoform of talc and intergrowth of tremolite and talc with (010)as interface are revealed .By analogy of metallographic textures,characteristics and mechanisms of the process of “deformation-recovery-recrystallization“ are discussed in detail,Topotactic reaction mechanism by which tremolite retrogresses to talc was studied and a retrogressive metamorphic origin of Longxi nephrite is proposed.
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| 关 键 词： | 软王 显微结构 变质作用 四川 透闪石 |
Sub-microscopic textures and retrogressive metamorphic origin of Longxi nephrite |
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| Wang Chunyun,Zhang Huifen,Ren Guohao.Sub-microscopic textures and retrogressive metamorphic origin of Longxi nephrite[J].Chinese Journal of Geochemistry,1990,9(2):182-187. |
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| Authors: | Wang Chunyun Zhang Huifen Ren Guohao |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, China;(2) Wuhan University of Technology, China |
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| Abstract: | Nephrite specimens from Longxi, Sichuan, prepared by ion-thinning and dispersion techniques have been studied using TEM and
SAED. A series of sub-microscopic textures such as (010) multiple-chain faults and related fault terminations, (001) mechanical twinning, sub-grain boundaries or fault walls, tremolite fibrous pseudoform of talc and intergrowth of tremolite
and talc with (010) as interface are revealed. By analogy of metallographic textures, characteristics and mechanisms of the process of “deformation
— recovery — recrystallization” are discussed in detail, Topotactic reaction mechanism by which tremolite retrogresses to
talc was studied and a retrogressive metamorphic origin of Longxi nephrite is proposed. |
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