Biofilm Origin of Clay-Coated Sand Grains
Biofilm Origin of Clay-Coated Sand Grains
复制标题
粘土包覆沙粒的生物膜起源
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Chung
中科院分区：
文献类型：
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作者：
L. Wooldridge;R. Worden;J. Griffiths;Anu Thompson;P. Chung
现代砂岩和古代砂岩中粘土大小的颗粒和粘土矿物的存在长期以来一直是一个有趣的问题，因为主要的沉积过程往往导致细粒和粗粒物质的物理分离。许多过程被用来解释砂岩中粘土矿物的普遍存在，包括渗透、絮凝泥浆的共沉积和生物扰动引起的沉积物混合。粘土矿物如何以及为什么在沉积地点形成颗粒涂层仍不清楚，尽管粘土包裹的砂粒对随后的成岩砂岩性质至关重要。我们已经确定了一种新的生物膜机制，可以解释粘土材料附着在砂粒表面导致碎屑粘土涂层的产生。本研究以现代河口为研究对象，综合运用野外考察、扫描电子显微镜、岩石学、生物标记物分析和拉曼光谱等方法，为生物膜在粘土覆盖砂粒形成中的关键作用提供证据。这项研究表明，在现代边缘海洋系统中，粘土涂层主要是由粘附性生物膜产生的。这种生物-矿物相互作用潜在地彻底改变了对粘土包裹砂粒的理解，并为加强古砂岩和深埋砂岩的储集层质量预测提供了第一步。
The presence of clay-sized particles and clay minerals in modern sands and ancient sandstones has long presented an interesting problem, because primary depositional processes tend to lead to physical separation of fine- and coarse-grained materials. Numerous processes have been invoked to explain the common presence of clay minerals in sandstones, including infiltration, the codeposition of flocculated muds, and bioturbation-induced sediment mixing. How and why clay minerals form as grain coats at the site of deposition remains uncertain, despite clay-coated sand grains being of paramount importance for subsequent diagenetic sandstone properties. We have identified a new biofilm mechanism that explains clay material attachment to sand grain surfaces that leads to the production of detrital clay coats. This study focuses on a modern estuary using a combination of field work, scanning electron microscopy, petrography, biomarker analysis, and Raman spectroscopy to provide evidence of the pivotal role that biofilms play in the formation of clay-coated sand grains. This study shows that within modern marginal marine systems, clay coats primarily result from adhesive biofilms. This bio-mineral interaction potentially revolutionizes the understanding of clay-coated sand grains and offers a first step to enhanced reservoir quality prediction in ancient and deeply buried sandstones.
影响因子：
18.3
作者：
E. Vignaga;D. Sloan;Xiaoyu Luo;H. Haynes;V. Phoenix;W. Sloan
通讯作者：
E. Vignaga;D. Sloan;Xiaoyu Luo;H. Haynes;V. Phoenix;W. Sloan
影响因子：
5.8
作者：
R. Schindler;D. Parsons;L. Ye;J. Hope;J. Baas;J. Peakall;A. Manning;Rebecca J. Aspden;J. Malarkey;S. Simmons;D. Paterson;I. D. Lichtman;A. Davies;P. Thorne;S. Bass
通讯作者：
R. Schindler;D. Parsons;L. Ye;J. Hope;J. Baas;J. Peakall;A. Manning;Rebecca J. Aspden;J. Malarkey;S. Simmons;D. Paterson;I. D. Lichtman;A. Davies;P. Thorne;S. Bass