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DOI10.1016/j.sedgeo.2011.10.011
Giant calcite concretions in aeolian dune sandstones; sedimentological and architectural controls on diagenetic heterogeneity, mid-Cretaceous Iberian Desert System, Spain
Eugenia Arribas, Maria2; Pedro Rodriguez-Lopez, Juan1; Melendez, Nieves1; Rosa Soria, Ana3; de Boer, Poppe L.4
通讯作者Pedro Rodriguez-Lopez, Juan
来源期刊SEDIMENTARY GEOLOGY
ISSN0037-0738
出版年2012
卷号243页码:130-147
英文摘要

Aeolian dune sandstones of the Iberian erg system (Cretaceous, Spain) host giant calcite concretions that constitute heterogeneities of diagenetic origin within a potential aeolian reservoir. The giant calcite concretions developed in large-scale aeolian dune foresets, at the transition between aeolian dune toeset and damp interdune elements, and in medium-scale superimposed aeolian dune sets. The chemical composition of the giant concretions is very homogeneous. They formed during early burial by low Mg-calcite precipitation from meteoric pore waters. Carbonate components with yellow/orange luminescence form the nuclei of the poikilotopic calcite cement. These cements postdate earlier diagenetic features, characterized by early mechanical compaction. Fe-oxide cements and clay rims around windblown quartz grains resulting from the redistribution of aeolian dust over the grain surfaces. The intergranular volume (IGV) in friable aeolian sandstone ranges from 73 to 15.3%. whereas in cemented aeolian sandstone it is 18.6 to 25.3%. The giant-calcite concretions developed during early diagenesis under the influence of meteoric waters associated with the groundwater flow of the desert basin, although local (e.g. activity of fluid flow through extensional faults) and/or other regional controls (e.g. variations of the phreatic level associated with a variable water influx to the erg system and varying sea level) could have favoured the local development of giant-calcite concretions. The spatial distribution pattern of carbonate grains and the main bounding surfaces determined the spatial distribution of the concretions. In particular, the geometry of the giant calcite concretions is closely associated with main bounding aeolian surfaces. Thus, interdune, superimposition and reactivation surfaces exerted a control on the concretion geometries ranging from flat and tabular ones (e.g. bounded by interdunes) to wedge-shaped concretions at the dune foresets (e.g. bounded by superimposition and reactivation surfaces) determining the spatial distribution of the heterogeneities of diagenetic origin in the aeolian reservoir. (C) 2011 Elsevier BM. All rights reserved.


英文关键词Giant calcite concretions Aeolian sandstones Porosity Reservoir Carbonate cements Heterogeneity
类型Article
语种英语
国家Spain ; Netherlands
收录类别SCI-E
WOS记录号WOS:000300128900009
WOS关键词CEDAR-MESA SANDSTONE ; ERG-MARGIN SYSTEM ; CEMENTED CONCRETIONS ; STRATIGRAPHIC EVOLUTION ; SEQUENCE STRATIGRAPHY ; DEPOSITIONAL FACIES ; BOUNDING SURFACES ; NEUQUEN BASIN ; EOLIAN DUNES ; NORTH-SEA
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174993
作者单位1.Univ Complutense Madrid, Dept Stratig, Grp Anal Cuencas Sedimentarias UCM CAM, Fac Ciencias Geol,Inst Geociencias UCM CSIC, E-28040 Madrid, Spain;
2.Univ Complutense Madrid, Dept Petrol & Geoquim, Inst Geociencias UCM CSIC, Fac Ciencias Geol, E-28040 Madrid, Spain;
3.Univ Zaragoza, Fac Ciencias, Grp Anal Cuencas Sedimentarias Continentales DGA, Dept Ciencias Tierra, E-50009 Zaragoza, Spain;
4.Univ Utrecht, Sedimentol Grp, Dept Earth Sci, NL-3584 CD Utrecht, Netherlands
推荐引用方式
GB/T 7714
Eugenia Arribas, Maria,Pedro Rodriguez-Lopez, Juan,Melendez, Nieves,et al. Giant calcite concretions in aeolian dune sandstones; sedimentological and architectural controls on diagenetic heterogeneity, mid-Cretaceous Iberian Desert System, Spain[J],2012,243:130-147.
APA Eugenia Arribas, Maria,Pedro Rodriguez-Lopez, Juan,Melendez, Nieves,Rosa Soria, Ana,&de Boer, Poppe L..(2012).Giant calcite concretions in aeolian dune sandstones; sedimentological and architectural controls on diagenetic heterogeneity, mid-Cretaceous Iberian Desert System, Spain.SEDIMENTARY GEOLOGY,243,130-147.
MLA Eugenia Arribas, Maria,et al."Giant calcite concretions in aeolian dune sandstones; sedimentological and architectural controls on diagenetic heterogeneity, mid-Cretaceous Iberian Desert System, Spain".SEDIMENTARY GEOLOGY 243(2012):130-147.
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