Facies dependence of the mineralogy and geochemistry of altered volcanic ash beds: An example from Permian-Triassic transition strata in southwestern China

• Published in: Earth-science reviews Vol. 190; pp. 58 - 88
• Main Authors: Hong, Hanlie, Algeo, Thomas J., Fang, Qian, Zhao, Lulu, Ji, Kaipeng, Yin, Ke, Wang, Chaowen, Cheng, Shi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2019
• Subjects: Diagenesis; K-bentonite; Mixed-layer illite-smectite; Mixed-layer kaolinite-smectite; Rare earth elements; Tuff; K-bentonite; Diagenesis; Rare earth elements; Mixed-layer kaolinite-smectite; Tuff; Mixed-layer illite-smectite

Factors controlling variations in the clay mineralogy and geochemical composition of volcanic ash beds deposited in different types of depositional environments remain incompletely understood. The well-correlated, altered volcanic ash beds (tuffs or K-bentonites) of Permian-Triassic boundary (PTB) s...