Attaining provenance proxies from OSL and TL sensitivities: Coupling with grain size and heavy minerals data from southern Brazilian coastal sediments

Author(s)

Zular, Andre ; Sawakuchi, Andre O. ; Guedes, Carlos C. F. ; Giannini, Paulo C. F.

• Document type: Journal article
• Source: Radiation Measurements; v. 81, p. 7-pg., 2015-10-01.

Abstract

In the Sao Francisco do Sul (SFS) barrier in southern Brazil, the optically stimulated luminescence (OSL) and thermoluminescence (TL) sensitivities of coastal sands vary according to geomorphological units. Sands from older beach ridges (ages older than 2000 years ago) show higher OSL and TL sensitivities than younger units (ages younger than 2000 years). Geomorphological units in the SFS attest to changes in provenance as a result of a coastal climate shift evidenced through grain size and heavy mineral analysis. We argue that in the SFS barrier sands, OSL and TL sensitivity signals provide an additional proxy to climate events and can be used as an alternative method to assess changes in provenance and tracking source-to-sink systems to monitor past and future environmental changes. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/54232-4 - Morphodynamics and chronology of quaternary aeolian depositional systems in Brazil
• Grantee: Paulo César Fonseca Giannini
• Support Opportunities: Regular Research Grants
• FAPESP's process: 09/53988-8 - Acquisition of a luminescence dating system and a precision microsampler for the study of environmental changes in the Quaternary period
• Grantee: Paulo César Fonseca Giannini
• Support Opportunities: Multi-user Equipment Program