A Compositional Classification For Grain Assemblages In Fine-Grained Sediments and Sedimentary Rocks—Reply
A Compositional Classification For Grain Assemblages In Fine-Grained Sediments and Sedimentary Rocks—Reply
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DOI：
10.2110/jsr.2016.2
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发表时间：
2014-12
影响因子：
2
通讯作者：
K. Milliken
中科院分区：
文献类型：
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作者：
K. Milliken
对于颗粒组合中小于62.5 µm（4 Phi）的颗粒重量或体积大于50%的沉积物和沉积岩，提出了一种三方成分分类法。焦油（陆源-泥质）包含一种颗粒组合，其中超过75%的颗粒来自盆外，包括来自大陆风化和火山碎屑的颗粒。卡尔（钙质-泥质）含有少于75%的盆外衍生碎屑颗粒，在其盆内颗粒中含有大量的生物成因碳酸盐颗粒，包括碳酸盐聚集体。Sarl（硅质-泥质）含有少于75%的盆外衍生颗粒，并含有生物硅质颗粒超过碳酸盐颗粒的优势。这三类细粒颗粒沉积物和岩石有效地分离出具有不同沉积环境以及有机质含量和次要颗粒类型系统对比的材料。在地下的颗粒组合，定义这些类遵循对比和可预测的成岩路径，具有显着的影响，散装岩石性质的演变，因此，分配一个细粒岩石到这些类之一是预测其经济和工程质量的重要的第一步。为了便于描述，这三个分类名称可以与表示岩石结构、更精确的成分划分、具有显著重要性的特定颗粒类型和成岩特征的修饰语术语相结合。
Abstract A tripartite compositional classification is proposed for sediments and sedimentary rocks that have grain assemblages with greater than 50 percent of a weight or volume of particles smaller than 62.5 µm (4 Phi). Tarl (terrigenous–argillaceous) contains a grain assemblage dominated by more than 75 percent of particles of extrabasinal derivation, including grains derived from continental weathering and also volcanogenic debris. Carl (calcareous–argillaceous) contains less than 75 percent of particles of extrabasinal derivation debris and among its intrabasinal grains contains a preponderance of biogenic carbonate particles including carbonate aggregates. Sarl (siliceous–argillaceous) contains less than 75 percent of particles of extrabasinal derivation and contains a preponderance of biogenic siliceous particles over carbonate grains. These three classes of fine-grained particulate sediments and rocks effectively separate materials that have distinct depositional settings and systematic contrasts in organic-matter content and minor grain types. In the subsurface the grain assemblages that define these classes follow contrasting and predictable diagenetic pathways that have significant implications for the evolution of bulk rock properties, and thus, assigning a fine-grained rock to one of these classes is an important first step for predicting its economic and engineering qualities. For purposes of description these three class names can be joined to modifier terms denoting rock texture, more precise compositional divisions, specific grain types of notable importance, and diagenetic features.