Remagnetization and chemical alteration of sedimentary rocks
Remagnetization and chemical alteration of sedimentary rocks
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DOI：
10.1144/sp371.15
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
R. Elmore;A. Muxworthy;M. Aldana
中科院分区：
文献类型：
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作者：
R. Elmore;A. Muxworthy;M. Aldana
摘要化学再磁化是沉积岩中一种非常普遍的现象，深入了解其机理有几个好处。二次磁化的获得通常是成岩事件的有形证据，可以通过分离化学还原磁化和比较磁极位置与表观极移路径来确定成岩事件的日期。这一点很重要，因为成岩研究经常受到难以约束大多数过去事件发生的时间框架的限制。再磁化通常会掩盖一次磁化;更好地理解再磁化可以提高我们发现一次磁化的能力。人们提出了许多化学再磁化机制，包括与一些不同流体（造山、盆地和烃类）的化学蚀变、埋藏成岩过程（粘土成岩和有机质成熟）或其他过程有关的机制。本文总结了我们目前的知识，这些化学再磁化机制，重点是例子，其中有一个连接与化学蚀变。
Abstract Chemical remagnetization is a very common phenomenon in sedimentary rocks and developing a greater understanding of the mechanisms has several benefits. Acquisition of a secondary magnetization is usually tangible evidence of a diagenetic event that can be dated by isolation of the chemical remanent magnetization and comparison of the pole position to the apparent polar wander path. This can be important because diagenetic investigations are frequently limited by the difficulty in constraining the time frames in which most past events have occurred. Remagnetization can commonly obscure a primary magnetization; developing a better understanding of remagnetization could improve our ability to uncover primary magnetizations. Many chemical remagnetization mechanisms have been proposed, including those associated with chemical alteration by a number of different fluids (orogenic, basinal and hydrocarbons), burial diagenetic processes (clay diagenesis and maturation of organic matter) or other processes. This paper summarizes our current knowledge of these chemical remagnetization mechanisms, with a focus on examples where there is a connection with chemical alteration.