An evolutionary model and classification scheme for nephrite jade based on veining, fabric development, and the role of dissolution–precipitation

Matthew S. Tarling, Steven A.F. Smith, Marianne Negrini, Li Wei Kuo, Wei Hsin Wu, Alan F. Cooper

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Although nephrite jade has been collected and treasured since the Stone Age, we lack a clear understanding of how it forms during deformation and metasomatism in shear zones. Using microstructural analysis of samples from Taiwan, California, and New Zealand, we propose a conceptual model for the evolution of nephrite jade that distinguishes four nephrite types based on mode of formation and textural characteristics: (1) primary (type 1a) or folded (type 1b) vein nephrite, (2) crenulated nephrite (type 2), (3) foliated semi-nephrite (type 3), and (4) nodular or domainal nephrite (type 4). We interpret the texture of our analysed samples to represent snapshots of a progressive textural evolution similar to that experienced by other deformed and fine-grained metamorphic rocks that develop under fluid-present, greenschist-facies conditions. Our observations suggest that types 2 and 3 nephrite can evolve from vein nephrite (type 1) by the development of crenulated and foliated metamorphic fabrics, during which the most important deformation process is dissolution–precipitation. However, development of metamorphic fabrics can be interrupted by transient brittle deformation, leading to the formation of type 4 nephrite that is characterised by nodular or angular clasts of nephrite in a nephritic matrix.

原文???core.languages.en_GB???
文章編號7823
期刊Scientific Reports
12
發行號1
DOIs
出版狀態已出版 - 12月 2022

指紋

深入研究「An evolutionary model and classification scheme for nephrite jade based on veining, fabric development, and the role of dissolution–precipitation」主題。共同形成了獨特的指紋。

引用此