Loss of Provenance Information Through Subsurface Diagenesis in Plio-Pleistocene Sandstones, Northern Gulf of Mexico
Loss of Provenance Information Through Subsurface Diagenesis in Plio-Pleistocene Sandstones, Northern Gulf of Mexico
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墨西哥湾北部上皮里奥-更新世砂岩地下成岩作用造成的物源信息丢失
DOI：
10.1306/212f8ee0-2b24-11d7-8648000102c1865d
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发表时间：
1988
影响因子：
2
通讯作者：
K. Milliken
中科院分区：
文献类型：
--
作者：
K. Milliken
摘要斜长石、钾长石和各种透明重矿物的地下蚀变极大地改变了墨西哥湾北方上新世-更新世沉积物的碎屑成分。斜长石钠长石化和不稳定颗粒溶解是两种主要的颗粒蚀变机制。颗粒蚀变随着深度的增加而逐渐增加，并且在没有大量大气流体影响的情况下发生。严格的地下颗粒蚀变影响这些年轻的沉积物的程度表明，在较老的岩石中的颗粒组合应被视为最怀疑的关于他们的保存状态。
ABSTRACT Subsurface alteration of plagioclase, potassium feldspar, and a variety of nonopaque heavy minerals has substantially modified the detrital composition of Plio-Pleistocene sediments in the northern Gulf of Mexico. Albitization of plagioclase and dissolution of unstable grains are the two principal mechanisms of grain alteration. Grain alteration increases progressively with depth and has taken place without the influence of significant amounts of meteoric fluids. The degree to which strictly subsurface grain alteration has affected these young sediments suggests that grain assemblages in older rocks should be viewed most skeptically with regard to their state of preservation.