Lacustrine carbonate facies distribution is controlled by multiple environmental parameters including climate, hydrology, and tectonic setting, but few published models address this complexity. In this study, seismic and borehole data, integrated with outcrop logging, correlations, and facies models, are used to create a new tectono-sedimentary model demonstrating how extensional faults, linked by a relay ramp, control distribution of lacustrine carbonate facies in the Upper Jurassic to Lower Cretaceous Purbeck Limestone Group (Wessex Basin, UK). Accumulation occurred in half-graben sub-basins south of two extensional east-west faults, with widespread subaerial emergence of footwall blocks to the north. The lacustrine limestones of the lowest unit of this Group are characterised by in-situ microbial mounds within bedded inter-mound packstones-grainstones. Mounds occur in three depositional intervals separated by paleosols. The distribution of facies indicates more brackish-water conditions shoreward to the west, and more hypersaline conditions basinward to the east. The relay ramp hosts extensive microbial carbonate buildups formed in response to carbonate-rich waters sourced from the northern limestone footwall blocks that fed into extensive shallow-water areas on the low-angle relay ramp slope.

中文翻译：

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伸展断层和中继斜坡对古地貌和湖相碳酸盐岩相的影响：Purbeck 石灰岩群（上侏罗纪 - 下白垩纪），Wessex 盆地，英国

湖泊碳酸盐岩相分布受多个环境参数控制，包括气候、水文和构造环境，但很少有已发表的模型解决了这种复杂性。在这项研究中，地震和钻孔数据与露头测井、相关性和相模型相结合，被用来创建一个新的构造沉积模型，展示由中继斜坡连接的伸展断层如何控制上层湖相碳酸盐岩相的分布。侏罗纪至下白垩纪 Purbeck 石灰岩群（英国威塞克斯盆地）。堆积发生在两条东西向伸展断层以南的半地堑次盆地中，北面广泛出现下盘地块。本组最低单元的湖相灰岩以层状丘间灰岩-粒纹岩内的原位微生物丘为特征。土丘出现在由古土壤隔开的三个沉积层段中。相的分布表明，向西向西多半咸水条件，向东向盆地多高盐度条件。接力坡道拥有大量微生物碳酸盐堆积物，这些碳酸盐是对源自北部石灰岩下盘块的富含碳酸盐的水形成的，这些水流入低角度接力坡道斜坡上的广泛浅水区。