PHREATIC VERSUS VADOSE METEORIC DIAGENESIS OF LIMESTONES: EVIDENCE FROM A FOSSIL WATER TABLE
PHREATIC VERSUS VADOSE METEORIC DIAGENESIS OF LIMESTONES: EVIDENCE FROM A FOSSIL WATER TABLE
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石灰岩的水流成岩作用与渗流成岩作用：来自化石水位的证据
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
L. Land
中科院分区：
文献类型：
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作者：
L. Land
总结
百慕大中更新世贝尔蒙特组部分为海滩-沙丘生物钙质碎屑岩，经历了强烈的同期胶结作用和成岩作用。海滩沉积物同时被纤维质等相胶结物胶结形成海滩岩，而先前沉积的风成岩在更远的内陆经历了强烈的大气降水潜水成岩作用，导致岩石中大部分亚稳成分的粗粒胶结和稳定化。在贝尔蒙特地下水位以上，渗流成岩作用在胶结和改变生物钙质砂屑岩方面相对无效。潜水大气成岩作用被解释为一个非常快速的过程，相对于渗流大气成岩作用，并导致更粗粒度的亮晶石。
SUMMARY
The Middle Pleistocene Belmont Formation of Bermuda consists in part of beach-dune biocalcarenites which underwent intense contemporaneous cementation and diagenesis. The beach deposits were contemporaneously cemented by fibrous isophacous cement to form beachrock, whereas previously deposited eolianites further inland underwent intense meteoric phreatic diagenesis, resulting in coarse-grained cementation and stabilization of most of the metastable components of the rock. Above the Belmont water table, vadose diagenesis was relatively ineffective in cementing and altering the biocalcarenites. Phreatic meteoric diagenesis is interpreted to be a very rapid process, relative to vadose meteoric diagenesis, and to result in a much coarser-grained sparite.