| Full text | |
| Author(s): |
Ortiz, Carlos
;
Parra, Mauricio
;
Rodrigues, Fernanda C. G.
;
Mineli, Thays D.
;
Sawakuchi, Andre O.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | QUATERNARY GEOCHRONOLOGY; v. 83, p. 9-pg., 2024-07-04. |
| Abstract | |
The optically stimulated luminescence (OSL) sensitivity of the fast component in quartz has been increasingly used in provenance analysis of Quaternary sediments. Quartz OSL natural sensitization is thought to be mainly controlled by the formation conditions of the source bedrock and surface processes occurring mainly in sediment source areas. Thus, quartz OSL sensitivity can be linked to distinct sediment source regions, based on their tectonic setting and erosion conditions. In this way, changes in quartz OSL sensitivity within siliciclastic successions would track variations in sediment provenance. So far, few works evaluated how the OSL sensitivity of quartz sand grains varies in sedimentary successions that experienced long-term cycles of deep burial, exhumation, and erosion. Therefore, this work aims to characterize the sensitivity of the fast OSL component of quartz sand grains retrieved from the Cenozoic sedimentary rocks of the Northern Andes basins and assess its spatiotemporal changes. We found that quartz grains with the lowest OSL sensitivity are sourced by crystalline and volcanic rocks related to the Andean Continental Arc emplaced in the Colombian Central Cordillera, reflecting the onset of denudation in orogenic sources during the Paleocene. Subsequently, increasing trends in OSL sensitivity are related to the sedimentary recycling during the Andean orogeny, reaching maximum values as a result of the progressive unroofing of Cretaceous rocks in the Colombian Eastern Cordillera, originally sourced from the low-relief Amazon Craton. Changes in quartz OSL sensitivity measured in the Cenozoic sedimentary basin-fill sequences of the Northern Andes vary according to the shifts in sediment provenance related to the orogenic construction and sediment recycling of the Andean range. (AU) | |
| FAPESP's process: | 18/12472-8 - Origin and chronology of sandy substrates in Amazonia: implications for quaternary evolution of open vegetation ecosystems |
| Grantee: | Fernanda Costa Gonçalves Rodrigues |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 23/07536-5 - Tracing uplift of the Northern Andes using luminescence sensitivity in quartz |
| Grantee: | Carlos Andrés Ortiz Barrios |
| Support Opportunities: | Scholarships abroad - Research Internship - Master's degree |
| FAPESP's process: | 22/16709-8 - Tracing Uplift of the Northern Andes using Luminescence Sensitivity in Quartz |
| Grantee: | Carlos Andrés Ortiz Barrios |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 18/23899-2 - Trans-Amazon Drilling Project: origin and evolution of the forests, climate, and hydrology of the South American tropics |
| Grantee: | André Oliveira Sawakuchi |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 18/15613-1 - Topographic construction along the northeastern Andes and the origin of the Transcontinental Amazon Basin |
| Grantee: | Mauricio Parra Amézquita |
| Support Opportunities: | Research Grants - Young Investigators Grants - Phase 2 |
| FAPESP's process: | 22/05520-1 - Climate and sedimentary dynamics of Amazonian floodplains during the Quaternary and its role on biotic diversification |
| Grantee: | Fernanda Costa Gonçalves Rodrigues |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |