Diagenetic and Paleoenvironmental Significance of Clay Minerals

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Clays and Engineered Mineral Materials".

Deadline for manuscript submissions: closed (31 July 2025) | Viewed by 757

Special Issue Editors


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Petrobras, Rio de Janeiro, Brazil
Interests: petrophysics; offshore drilling; formation evaluation; oilfield; well logging; petroleum geology

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Special Issue Information

Dear Colleagues,

Clay minerals, fine-grained silicate minerals with a layered structure, play a crucial role in sedimentary rocks and provide valuable insights into provenance and sediment transport, weathering and diagenetic processes, paleoenvironmental conditions, and even biological mediation.

Detrital clay minerals, generated by weathering, are transported and deposited, becoming susceptible to a series of diagenetic processes that imprint physical and chemical changes in sedimentary environments. On the other hand, authigenic clay minerals form in situ through various processes, such as soil formation, sedimentary diagenesis, metamorphic and hydrothermal processes, or direct precipitation from saturated solutions. Thus, the significance of clay minerals in diagenetic and paleoenvironmental contexts is multifaceted, reflecting their sensitivity to physical and chemical changes in sedimentary environments and their role in recording geological processes.

Overall, clay minerals are valuable tools for reconstructing the diagenetic history and paleoenvironmental conditions. Their transformations and assemblages provide insights into the thermal, chemical, and mechanical processes that have affected sediments over geological time, with significant environmental and economic implications.

This Special Issue aims to publish papers that provide advances and a comprehensive overview of the mineralogy, geochemistry, and applications of clay minerals as proxies for paleoenvironmental and diagenetic processes.

We look forward to receiving your outstanding contributions.

Dr. Paulo R.A. Netto
Prof. Dr. Manuel Pozo Rodríguez
Guest Editors

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Keywords

  • clay minerals
  • authigenesis
  • diagenesis
  • paleoenvironment
  • paleoclimate
  • weathering
  • sedimentary basins

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Published Papers (1 paper)

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Research

14 pages, 4298 KB  
Article
Experimental Investigation of Kaolinite–Zeolite Transformation: Insights from Al-Habala Area Saprolite, Abha, Saudi Arabia
by Ali Sarbast Khoshnaw, Dana Nader Alismail, Abdulwahab Muhammad Bello and Khalid Al-Ramadan
Minerals 2025, 15(9), 920; https://doi.org/10.3390/min15090920 - 29 Aug 2025
Viewed by 367
Abstract
This study investigates the synthesis of zeolite from kaolinite-rich saprolite from Al-Habala Area, Saudi Arabia, providing insights on kaolinite as an economically viable precursor for zeolite formation. This study was conducted using hydrothermal rectors with a 0.5 M Na2CO3 solution [...] Read more.
This study investigates the synthesis of zeolite from kaolinite-rich saprolite from Al-Habala Area, Saudi Arabia, providing insights on kaolinite as an economically viable precursor for zeolite formation. This study was conducted using hydrothermal rectors with a 0.5 M Na2CO3 solution at temperatures of 150 °C, 200 °C, and 250 °C over a duration of 336 h. At 150 °C, the dissolution of the clay and feldspar grains began, forming amorphous silica, from which mordenite rods formed. Increased temperatures promoted the formation of cubic analcime crystals at 200 °C to well-developed trapezohedron aggregates at 250 °C. The mineralogical transformations were characterized using SEM, XRD, and ICP-OES analyses, revealing the role of temperature on the morphologies, compositional alteration, and decreasing Na concentrations correlating with the formation of analcime. The newly formed analcime closely matched the composition of natural analcime from different basins. The results confirm that saprolite can effectively serve as a medium for zeolite synthesis, highlighting its potential for cost-effective industrial applications and expanding the understanding of kaolinite-to-zeolite conversion pathways. Full article
(This article belongs to the Special Issue Diagenetic and Paleoenvironmental Significance of Clay Minerals)
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