Both sediment recycling and first-cycle input influence the composition of clastic material in sedimentary systems. This paper examines conceptually the roles played by these processes in governing the composition of clastic sediment on a regional scale by outlining the expected effects on sediment composition of protracted sediment recycling and of continuous first-cycle input on a maturing continental block. Generally speaking, long-term recycling tends to enrich sediments in the most chemically and mechanically stable components: quartz in the sand and silt size fractions, and illite among the clay minerals. Sandstones trend towards pure quartz arenites, and mudrocks become more potassic and aluminous. The average grain size of clastic sediment decreases by a combination of progressive attrition of sand grains and ongoing breakdown of primary silicate minerals to finer-grained clay minerals and oxides. Sandstones derived by continuous first-cycle input from an evolving continental crustal source also become increasingly rich in quartz, but in addition become more feldspathic as the proportion of granitic material in the upper continental crust increases during crustal stabilization. Associated mudrocks also become richer in potassium and aluminum, but will have higher K2O/Al2O3 ratios than recycled muds. The average grain size of the sediment may increase with time as the proportion of sand-prone granitic source rocks increases at the expense of more mud-prone volcanic sources. In general, except in instances where chemical weathering is extreme, first-cycle sediments lack the compositional maturity of recycled detritus, and are characterized by the presence of a variety of primary silicate minerals. Sedimentary systems are not usually completely dominated by either recycling or first-cycle detritus. Generally, however, sedimentary systems associated with the earliest phases of formation and accretion of continental crust are characterized by first-cycle input from igneous and metamorphic rocks, whereas those associated with more mature cratons tend to be dominated by recycled sedimentary material.

中文翻译：

---

对碎屑沉积物成分和大陆块及其沉积覆盖共同演化的区域尺度控制的概念性回顾。

沉积物再循环和第一循环输入都会影响沉积系统中碎屑物质的组成。本文从概念上考察了这些过程在区域范围内控制碎屑沉积物组成中所起的作用，概述了持续的沉积物循环利用和成熟大陆块上连续的第一周期输入对沉积物组成的预期影响。一般而言，长期回收往往会使化学和机械最稳定的组分中的沉积物富集：沙子和粉砂中的石英和粘土矿物中的伊利石。砂岩趋向于纯石英砂岩，而泥岩变得更加钾质和铝质。沙粒的逐渐磨损和初级硅酸盐矿物逐渐分解为细粒粘土矿物和氧化物的综合作用，使碎屑沉积物的平均粒径减小。来自不断演化的大陆地壳源的连续第一周期输入所产生的砂岩也变得越来越富含石英，但是随着地壳稳定过程中上部大陆地壳中花岗岩物质的比例增加，砂岩也变得更具长石性。伴生的泥岩还富含钾和铝，但比再生泥具有更高的K2O / Al2O3比。随着易生砂质花岗岩源岩的比例增加，沉积物的平均粒径可能会随时间增加，而更多易发生泥浆的火山岩源却成为代价。一般来说，除了在化学风化极端的情况下，第一周期沉积物缺乏回收碎屑的成分成熟度，而且其特征是存在多种主要的硅酸盐矿物。沉积系统通常不被循环利用或第一循环碎屑完全控制。但是，一般而言，与陆壳形成和积聚最早阶段有关的沉积系统的特征是来自火成岩和变质岩的第一周期输入，而与较成熟克拉通相关的沉积系统则往往由回收的沉积物质主导。沉积系统通常不被循环利用或第一循环碎屑完全控制。但是，一般而言，与陆壳形成和积聚最早阶段有关的沉积系统的特征是来自火成岩和变质岩的第一周期输入，而与较成熟克拉通相关的沉积系统则往往由回收的沉积物质主导。沉积系统通常不被循环利用或第一循环碎屑完全控制。然而，通常，与大陆壳形成和积聚最早阶段有关的沉积系统的特征是来自火成岩和变质岩的第一周期输入，而与较成熟克拉通相关的沉积系统则往往由回收的沉积物质主导。