Pyrite corona nodules from the ∼2.7 Ga Kapai Slate, a thin, sulfidic carbonaceous shale horizon interbedded with basaltic lava flows in the Yilgarn Craton, Western Australia, have concentric compositional and isotopic zoning with distinctive textural differences between cores and mantles. The sieved-textured cores are enriched in highly compatible trace elements, incl. Ni, As, Ag, Te, Sb, Bi and Pb, and depleted in incompatible Mo and Tl, whereas the radiating-textured mantles are strongly depleted in compatible elements and enriched in incompatible elements, relative to the cores. A striking feature of the data is that both the compatible and incompatible elements are linearly correlated, with correlation coefficients as high as 0.99. A marked drop in the concentration of compatible elements and an increase in incompatible elements at the core-mantle boundary is attributed to a sudden change in the rate of growth of the nodules produced by eruption of the voluminous overlying Paringa Basalt. The weight of the basalt produced sudden compaction of the unconsolidated clays below resulting in upward advection of pore fluid, which thinned the boundary layer around the growing nodules, leading to a marked increase in the rate of pyrite growth. Rapid pyrite growth led to a dramatic depletion in highly compatible elements, and to a build-up in incompatible elements, in the boundary layers around the growing nodule mantles, which resulted in extreme depletion of compatible elements, and enrichment in incompatible elements in the nodule mantles, relative to the cores. The corona nodules are also isotopically zoned with cores that have higher δ³⁴S, with small positive Δ³³S values, and mantles that have lower δ³⁴S and higher Δ³³S. The increase in Δ³³S towards the rims is attributed to S₈ being advected to the growing mantles by upward fluid movement during sudden compaction, and the decrease in δ³⁴S to the lighter S isotope, with its higher reactivity and diffusivity, being preferentially incorporated into the fast growing pyrite mantle.

The extreme changes in the growth rates of the Kapai Slate corona pyrite nodules provide a new constraint on the partition coefficients of the trace elements between Archean ocean water and sedimentary pyrite. The compatibility of the analysed trace elements decreases in the order Bi > Te > Sb > Ag > Cu > Pb > Ni ≈ As > (Co, Zn, Se, Cd, Mn, W) > Tl > Mo, which is consistent with the order obtained from modern sedimentary pyrites by Large et al. (2014), except for the redox-sensitive elements Mn, Tl and Mo. These differences are attributed to the lower oxygen content of the Archean atmosphere and oceans.

来自约 2.7 Ga Kapai 板岩的黄铁矿日冕结核，这是一种薄的硫化碳质页岩层，与西澳大利亚 Yilgarn 克拉通的玄武岩熔岩流互层，具有同心成分和同位素分带，在核和地幔之间具有明显的结构差异。筛分纹理核心富含高度相容的微量元素，包括。Ni、As、Ag、Te、Sb、Bi 和 Pb，并耗尽不相容的 Mo 和 Tl，而相对于核，辐射纹理地幔强烈耗尽相容元素并富含不相容元素。数据的一个显着特点是相容元素和不相容元素都呈线性相关，相关系数高达0.99。核-地幔边界处相容元素浓度的显着下降和不相容元素的增加归因于上覆大量帕林加玄武岩喷发产生的结核生长速率的突然变化。玄武岩的重量使下方松散的粘土突然压实，导致孔隙流体向上平流，使生长结核周围的边界层变薄，导致黄铁矿生长速度显着增加。黄铁矿的快速生长导致高度相容元素的急剧枯竭，以及不相容元素在生长的结核地幔周围的边界层中的积累，导致相容元素的极度枯竭和结核中不相容元素的富集地幔，相对于核心。³⁴ S，具有较小的正 Δ ³³ S 值，以及具有较低 δ ³⁴ S 和较高 Δ ³³ S 的地幔。 Δ ³³ S 向边缘的增加归因于 S ₈通过向上的流体运动平流到正在生长的地幔中突然压实，δ ³⁴ S减少到较轻的 S 同位素，具有较高的反应性和扩散性，优先并入快速生长的黄铁矿地幔。

卡派板岩电晕黄铁矿结核生长速率的极端变化为太古代海水与沉积黄铁矿之间微量元素的分配系数提供了新的约束。分析的微量元素的相容性按 Bi > Te > Sb > Ag > Cu > Pb > Ni ≈ As > (Co, Zn, Se, Cd, Mn, W) > Tl > Mo 的顺序降低，这与大等人从现代沉积黄铁矿中获得的顺序。(2014)，除了氧化还原敏感元素 Mn、Tl 和 Mo。这些差异归因于太古代大气和海洋的氧含量较低。