Significance of partial leaching in calcareous ooids: The case study of Hauterivian oolites in Switzerland

[摘要] In the Canton of Vaud (Switzerland), two Hauterivian oolitic units were penetrated by a borehole. In both units, the ooids are partly leached. More specifically, the ooid cortices were partly leached and some ooid nuclei appear suspended in the middle of cortical moldic cavities created by leaching, rather than having fallen to the bottom of these cavities before the final cementation take place. We demonstrate that these ooids were originally calcitic, not aragonitic, not

[学科分类] 地质学

[关键词] Switzerland;Urgonian;Hauterivian;calcareous ooids;dissolution;calcite;aragonite;organic matter