During the Cretaceous, high global sea‐level and low latitudinal temperature variations led to the growth of epeiric carbonate platforms. Platform‐scale dolomitization of these platforms is not common, reflecting the low Mg/Ca ratio of seawater and a humid climate. This study describes the processes governing pervasive dolomitization of a land‐attached carbonate platform within the Iberian Basin. Dolomite is planar to sub‐planar with a geochemical signature consistent with dolomitization from penesaline seawater. Dolomitization was most pervasive during a 1 Myr period in the middle Cenomanian, by repeated reflux of seawater from brine pools formed on the top of a southward‐prograding carbonate platform. Tilting and structural reorganization in the Upper Cenomanian led to a reversal in polarity of the platform, and dolomitization was restarted by the northward reflux of seawater. Rising relative sea‐level and oceanic acidification led to back‐stepping of the platform such that the supply of dolomitizing fluids was cut off. In the Lower Turonian, pervasively dolomitized rudist rudstone facies in the south of the study area indicate that dolomitization restarted, either penecontemporaneously or later, from highly evaporated Campanian–Maastrichtian seawater. A systematic increase in dolomite crystal size up‐section ties broadly, but not entirely, to stratigraphy. It is possible that these textural differences reflect changes in fluid chemistry, limestone permeability or precursor rock texture. However, the lack of stratigraphic conformance, and the preservation of the earliest‐formed dolomite only in the oldest sediments, could indicate a progressive recrystallization of early‐formed dolomite through repeated reflux of brines. As such, the succession appears to preserve a fossilized record of dolomite recrystallization through time during the Cenomanian–Turonian. The results of this study therefore provide a record of the progressive dolomitization of a carbonate platform and demonstrate the important interplay of climate and basin‐scale tectonics on dolomite distribution and crystallinity.

中文翻译：

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构造，气候和Eustasy在控制白云石化中的相互作用：以伊比利亚盆地的Cenomanian-Turonian浅海碳酸盐为例

在白垩纪期间，全球海平面高和纬度温度低变化导致上碳酸盐岩台地的增长。这些平台的平台规模白云石化并不常见，这反映了海水中Mg / Ca比例低和气候潮湿。这项研究描述了控制伊比利亚盆地内陆上碳酸盐台地普遍白云石化的过程。白云石是平面到亚平面的，具有地球化学特征，与来自Penesaline海水的白云石化相一致。在南塞诺曼期中部的1 Myr时期，白云石化作用最为普遍，这是由于从向南扩展的碳酸盐岩平台顶部形成的盐水池中的海水反复回流所致。上西诺曼尼亚地区的倾斜和结构重组导致平台极性反转，海水向北回流使白云石化重新开始。相对海平面上升和海洋酸化导致平台后退，从而切断了白云石化流体的供应。在下土伦地区，研究区南部普遍存在的白云石化的白垩纪的红绿柱石相表明，白云石化从高度蒸发的Campanian-Maastrichtian海水中恢复到了半透明的时期。白云岩晶体尺寸上移的系统性增加与地层有广泛联系，但并不完全联系。这些质地差异可能反映了流体化学，石灰石渗透率或前体岩石质地的变化。但是，缺乏地层一致性，仅在最古老的沉积物中保留了最早形成的白云岩，可能表明早先形成的白云石通过盐水的反复回流而逐渐重结晶。这样，该演替似乎保留了在塞诺曼期–土伦期的白云岩重结晶化石记录。因此，这项研究的结果提供了碳酸盐台地逐步白云石化的记录，并证明了气候和盆地尺度构造对白云岩分布和结晶度的重要相互作用。