Title

Processes Controlling Weathering Rind Advancement on Costa Rican Basalt Clasts

Document Type

Book Chapter

Publication Date

2004

Department

Earth Sciences

Language

English

Publication Title

Water-Rock Interaction: Proceedings of the Eleventh International Symposium on Water-Rock Interaction, WRI-11, 27 June-2 July 2004, Saratoga Springs, New York, USA

Abstract

Soils developing on the 120 ka terrace of the Rio Parrita near the Pacific coast of Costa Rica contain basalt clasts with well-developed weathering rinds. These rinds are the result of in situ, isovolumetric chemical weathering of the parent clast. This weathing rind system can be viewed as a miniature saprolite-forming environment where the processes occurring at the rind/core interface are analogous to processes occurring at larger landscape scales at the saprolite/bedrock interface. Physical and chemical characteristics of the rind/core interface have been examined in two clasts with different textures using scanning electron microscopy (SEM), SEM energy dispersive X-ray (SEM-EDX), and computed tomography X-ray (CT) imaging. Dissolution of plagioclase at this boundary is clearly evident. The migration of the core/rind boundary appears to depend in part upon the dissolution of plagioclase and resulting formation of secondary porosity at the interface.

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