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Anomalously low chemical weathering in fluvial sediment of a tropical watershed (Puerto Rico)

2018; Geological Society of America; Volume: 46; Issue: 8 Linguagem: Inglês

10.1130/g40315.1

1943-2682

Young Ji Joo, M. E. Elwood Madden, Gerilyn S. Soreghan,

earthquake and tectonic studies

Research Article| July 12, 2018 Anomalously low chemical weathering in fluvial sediment of a tropical watershed (Puerto Rico) Young Ji Joo; Young Ji Joo 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA2Korea Polar Research Institute, Incheon 21990, Republic of Korea Search for other works by this author on: GSW Google Scholar Megan E. Elwood Madden; Megan E. Elwood Madden * 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA *E-mail: melwood@ou.edu Search for other works by this author on: GSW Google Scholar Gerilyn S. Soreghan Gerilyn S. Soreghan 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Young Ji Joo 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA2Korea Polar Research Institute, Incheon 21990, Republic of Korea Megan E. Elwood Madden * 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Gerilyn S. Soreghan 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA *E-mail: melwood@ou.edu Publisher: Geological Society of America Received: 23 Mar 2018 Revision Received: 04 Jun 2018 Accepted: 11 Jun 2018 First Online: 12 Jul 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2018) 46 (8): 691–694. https://doi.org/10.1130/G40315.1 Article history Received: 23 Mar 2018 Revision Received: 04 Jun 2018 Accepted: 11 Jun 2018 First Online: 12 Jul 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Young Ji Joo, Megan E. Elwood Madden, Gerilyn S. Soreghan; Anomalously low chemical weathering in fluvial sediment of a tropical watershed (Puerto Rico). Geology 2018;; 46 (8): 691–694. doi: https://doi.org/10.1130/G40315.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Humid tropical and subtropical regions commonly host thick soils that supply sediment to adjacent streams. These soils are depleted in Ca and Na and enriched in Al and Si, yielding high chemical weathering indices, including chemical index of alteration (CIA) values >90, indicative of intense chemical weathering. Here, we investigated chemical weathering in granitoid-sourced fluvial sediments of Puerto Rico—a region with one of the highest documented rates of chemical weathering on Earth. Although thick soils occur throughout the study area, weathering signatures from fluvial muds (CIA values of 58–69) are significantly lower than expected. Indeed, these weathering indices are similar to values expected in climates 10–20 °C cooler. These remarkably low values likely reflect significant input from partially weathered bedrock mobilized during mass wasting. Furthermore, future climate warming may increase torrential precipitation and accompanying mass wasting, producing a counterintuitive decrease in weathering intensity recorded in fluvial sediments. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.