Abstract
Payoff Cave, found within dolomitized sections of the Seroe Domi Formation on Aruba, provides a set of diagenetic observations unique to island karst. Paleosol breccia found as wall and ceiling rock and as bedrock pillars within Payoff Cave was determined to be low-Mg calcite in mineralogy with clasts of dolomitized host limestone. Payoff Cave is interpreted to be a flank margin (FM) cave based on morphologic features. The relevant diagenetic history of this section of the Seroe Domi is: (1) dolomitization and initial cave formation, (2) collapse and paleosol breccia formation within the initial cave, (3) reoccupation of the mixing zone to form a new FM cave within the more soluble calcitic paleosol breccia, and (4) cliff retreat and exposure of Payoff Cave as found today. Dolomitization, karstification, and the presence of a paleosol breccia combine in a complex diagenetic history on Aruba.
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