Luminescence signals of quartz and feldspar as new methods for stratigraphic discrimination and provenance analysis of siliciclastic successions: The case of the Parnaíba Basin (Brazil) of West Gondwana

• DOI: 10.1111/bre.12590
• Publication Date: 2021-07-28T08:15:28Z
• Authors: Ian del Río; André O. Sawakuchi; Ana M. Góes; Maria Helena B. M...; Laura Y. Furukawa; Naomi Porat; Mayank Jain; Thays D. Mineli; Francisco de Assi...
• Keywords: Siliciclastic; Thermoluminescence dating; Optically stimulated luminescence; Authigenic

Abstract Luminescence characteristics of quartz and feldspar allow to discriminate sediments from different source areas. Particularly, sensitivity optically stimulated luminescence (OSL) thermoluminescence (TL) signals infrared‐stimulated (IRSL) Quaternary has been used for provenance analysis. These properties change due area denudation rates sediment reworking, which drive the number burial irradiation‐solar exposure cycles grains in surface systems. Here, we use first time a similar approach interpret geomorphic conditions areas Silurian Triassic siliciclastic sedimentary units intracratonic Parnaíba Basin northeast Brazil. measurements were performed on sand grains, statistical tests applied evaluate differences within across stratigraphic units. We explored position well‐known “110°C” (TL 110 ) “325°C” 325 TL peaks as proxies with lithological assemblages. OSL sensitivities well dominance so‐called fast component increase units, while IRSL decreases towards younger patterns point decreasing rate higher recycling over basin filling time, leading concentration sensitisation. Major changes coincide regional unconformities. This is attributed physical landscape shifts relief recycling. The peak but significant variation, values between 324°C 334°C, allowing its discrimination. Changes are preserved during long‐term (10 8 Ma), representing new tool interpreting evolution perform analysis ancient successions.