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Spatial and temporal facies evolution of a Lower Jurassic carbonate platform, NW Tethyan margin (Mallorca, Spain)

机译：低侏罗纪碳酸盐平台的空间和颞级相进化，NW Tethyan Margin（Mallorca，西班牙）

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摘要

The variety of depositional facies of a Lower Jurassic carbonate platform has been investigated on the island of Mallorca along a transect comprising six stratigraphic profiles. Twenty-nine facies and sub-facies have been recognized, grouped into seven facies associations, ranging in depositional environment from supratidal/terrestrial and peritidal to outer platform. Spatial and temporal (2D) facies distribution along the transect reflects the evolution of the carbonate platform with time showing different facies associations, from a broad peritidal platform (stage 1) to a muddy open platform (stage 2), and finally to a peritidal to outer carbonate platform (stage 3). Stage 1 (early Sinemurian to earliest late Sinemurian) corresponds to a nearly-flat peritidal-shallow subtidal epicontinental platform with facies belts that shifted far and fast over the whole study area. The evolution from stage 1 to stage 2 (late Sinemurian) represents a rapid flooding of the epicontinental shallow platform, with more open-marine conditions, and the onset of differential subsidence. During stage 3 (latest Sinemurian), peritidal and shallow-platform environments preferentially developed to the northeast (Llevant Mountains domain) with a rapid transition to middle-outer platform environments toward the northwest (Tramuntana Range domain). Stages 1 and 3 present facies associations typical of Bahamian-type carbonates, whereas stage 2 represents the demise of the Bahamian-type carbonate factory and proliferation of muddy substrates with suspension-feeders. The described platform evolution responded to the interplay between the initial extensional tectonic phases related to Early Jurassic Tethyan rifting, contemporaneous environmental perturbations, and progressive platform flooding related to the Late Triassic-Early Jurassic worldwide marine transgression and associated accommodation changes.
机译：在Mallorca岛上沿着包含六个地层曲线的横剖视角进行了较低侏罗纪碳酸盐平台的各种沉积相。已经认识到了二十九个相和子面，分为七个相吻学，包括来自Suprativeral /陆地和突出的沉积环境。沿着横扫的空间和时间（2D）相片分布反映了碳酸盐平台的演变与时间显示不同的各个关联，从宽泛的突出平台（第1阶段）到泥泞的开放平台（第2阶段），最后到突出外碳酸盐平台（第3阶段）。第1阶段（初学家早期至最早的SINEMURIAN）对应于一个近乎平坦的突出的浅浅阴影综合性平台，面部带转移到整个研究区域。从第1阶段到第2阶段的演变（晚睿建安晚期）代表了综合浅层平台的快速洪水，具有更多开放的海洋状况，以及微分沉降的发作。在第3阶段（最新的Sinemurian），突出和浅平台环境优先向东北（LLEVANT山域）开发，并迅速过渡到西北地区的中外平台环境（Tramuntana范围域）。阶段1和3存在典型的Bahamian型碳酸酯的面部关联，而第2阶段代表巴哈斗式碳酸盐酯厂的消亡及悬浮饲养者的泥浆基材的膨胀。所描述的平台演进响应了与早期侏罗纪Tethyan散步，同期环境扰动和与晚期三叠系早期侏罗纪世界海外海关和相关住宿变化相关的初始扩展构造阶段之间的相互作用。

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