FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4213181260> ?p ?o ?g. }

• W4213181260 endingPage "73" @default.
• W4213181260 startingPage "40" @default.
• W4213181260 abstract "The dynamics of tropical weathering through time with the formation and long-term evolution of laterite associated with climatic and geodynamic forcing is still a poorly explored issue. To better access this, we focused on lateritic-bauxitic duricrusts from the well-explored, 300 m high Kaw mountain in northeastern French Guiana. Macroscopically homogeneous Fe (oxyhydr)oxides-rich subsamples were separated from 10 bulk samples. Bulk- and subsamples were investigated by mineralogical and geochemical analyses and (U-Th)/He geochronology. The samples show a large heterogeneity on the macro- and microscopic scale reflecting different stages of duricrust formation and evolution through processes of dissolution and (re)precipitation of Fe (oxyhydr)oxides. The 284 (U-Th)/He ages obtained for goethite α-(Fe, Al)OOH and hematite α-Fe2O3 range from 30.5 ± 3.1 to < 0.8 Ma and show large variability within a sample. The oldest hematite and Al-poor goethite subsamples precipitated since 30 Ma and formed while kaolinite was stable. Precipitation of Fe-minerals increased since ∼ 14–12 Ma but still happened under ferruginous lateritic, non-bauxitic conditions. The dissolution and (re)precipitation of Fe minerals, Al-substitution in goethite, and the overall enrichment in Th, as well as gibbsite precipitation indicate an intensification of weathering and a shift towards bauxitic conditions since the end of the Miocene. The Th-, U-, and Al-rich Fe phases formed in this late episode of intense weathering partially replace the oldest, often Th- and U-poor phases leading to a considerable age spread. We claim that this episode of intensified weathering, which had its peak at ca. 6–2 Ma, corresponds to the bauxitization of the lateritic cover of Kaw mountain. Our proposed model of lateritization since at least 30 Ma and bauxitization since the late Miocene provides new constraints on the timescale and intensity of weathering at Kaw mountain. The onset of lateritization in French Guiana (Kaw region) is potentially older than ca. 30 Ma and was possibly synchronous with the development of bauxites in neighboring countries, and differences in the Paleogene weathering intensity might be due to different drainage capacities of the parental material. Late Neogene bauxitization suggests a regional increase in precipitations and drainage potentially linked to increased incision owing to local uplift. Finally, we confirm that a detailed combination of geochronological results coupled to mineralogical and geochemical analyses improves our understanding of tropical weathering processes and duricrust formation by placing mineralogical and geochemical processes into a temporal framework." @default.
• W4213181260 created "2022-02-24" @default.
• W4213181260 creator A5001972326 @default.
• W4213181260 creator A5007585895 @default.
• W4213181260 creator A5028596418 @default.
• W4213181260 creator A5031797477 @default.
• W4213181260 creator A5040901817 @default.
• W4213181260 creator A5041206946 @default.
• W4213181260 creator A5074564312 @default.
• W4213181260 creator A5079349772 @default.
• W4213181260 creator A5083032497 @default.
• W4213181260 creator A5083706926 @default.
• W4213181260 creator A5089267646 @default.
• W4213181260 date "2022-04-01" @default.
• W4213181260 modified "2023-09-26" @default.
• W4213181260 title "Reading the climate signals hidden in bauxite" @default.
• W4213181260 cites W1610621533 @default.
• W4213181260 cites W1970283992 @default.
• W4213181260 cites W1973767821 @default.
• W4213181260 cites W1974073968 @default.
• W4213181260 cites W1975546264 @default.
• W4213181260 cites W1977740010 @default.
• W4213181260 cites W1985889447 @default.
• W4213181260 cites W1986140763 @default.
• W4213181260 cites W1998236113 @default.
• W4213181260 cites W2002449222 @default.
• W4213181260 cites W2003488835 @default.
• W4213181260 cites W2006040444 @default.
• W4213181260 cites W2014145546 @default.
• W4213181260 cites W2024210206 @default.
• W4213181260 cites W2025780112 @default.
• W4213181260 cites W2026877746 @default.
• W4213181260 cites W2029964093 @default.
• W4213181260 cites W2030246380 @default.
• W4213181260 cites W2032096308 @default.
• W4213181260 cites W2033670093 @default.
• W4213181260 cites W2040080056 @default.
• W4213181260 cites W2040643332 @default.
• W4213181260 cites W2041080687 @default.
• W4213181260 cites W2042366312 @default.
• W4213181260 cites W2044479101 @default.
• W4213181260 cites W2044994077 @default.
• W4213181260 cites W2055442076 @default.
• W4213181260 cites W2056605536 @default.
• W4213181260 cites W2057552572 @default.
• W4213181260 cites W2058032279 @default.
• W4213181260 cites W2062633464 @default.
• W4213181260 cites W2063721379 @default.
• W4213181260 cites W2063994607 @default.
• W4213181260 cites W2064530868 @default.
• W4213181260 cites W2066216965 @default.
• W4213181260 cites W2070716407 @default.
• W4213181260 cites W2076017235 @default.
• W4213181260 cites W2082462029 @default.
• W4213181260 cites W2083441806 @default.
• W4213181260 cites W2088583542 @default.
• W4213181260 cites W2090423888 @default.
• W4213181260 cites W2094545984 @default.
• W4213181260 cites W2096185740 @default.
• W4213181260 cites W2108826566 @default.
• W4213181260 cites W2112184907 @default.
• W4213181260 cites W2115548373 @default.
• W4213181260 cites W2116634224 @default.
• W4213181260 cites W2133155865 @default.
• W4213181260 cites W2135965501 @default.
• W4213181260 cites W2136791754 @default.
• W4213181260 cites W2137966020 @default.
• W4213181260 cites W2142835121 @default.
• W4213181260 cites W2143413964 @default.
• W4213181260 cites W2144902994 @default.
• W4213181260 cites W2145180142 @default.
• W4213181260 cites W2162506399 @default.
• W4213181260 cites W2164103141 @default.
• W4213181260 cites W2166587069 @default.
• W4213181260 cites W2177114131 @default.
• W4213181260 cites W2185304862 @default.
• W4213181260 cites W2278086497 @default.
• W4213181260 cites W2314813734 @default.
• W4213181260 cites W2316463087 @default.
• W4213181260 cites W2318156580 @default.
• W4213181260 cites W2320087255 @default.
• W4213181260 cites W2331441635 @default.
• W4213181260 cites W2508955515 @default.
• W4213181260 cites W2548564294 @default.
• W4213181260 cites W2599363749 @default.
• W4213181260 cites W2603762175 @default.
• W4213181260 cites W2620771639 @default.
• W4213181260 cites W2621164945 @default.
• W4213181260 cites W2782799159 @default.
• W4213181260 cites W2790410732 @default.
• W4213181260 cites W2793815045 @default.
• W4213181260 cites W2796884027 @default.
• W4213181260 cites W2898962279 @default.
• W4213181260 cites W2898979032 @default.
• W4213181260 cites W2920927865 @default.
• W4213181260 cites W2946088634 @default.
• W4213181260 cites W3015374988 @default.
• W4213181260 cites W3044453881 @default.

• next