Lateritic profile on basalt, northern Hainan
Northern Hainan Island, China
Soils
- Type
- Soil
Lateritic profile about 6 m deep on Neogene tholeiitic basalt (K-Ar 4.05 ± 0.33 Ma), under a humid tropical climate (25 C, 1500 mm/yr); red laterite at the top, yellow material at about 2.5 to 3.2 m, brown soil with less weathered core stones below; secondary minerals: kaolinite, halloysite, gibbsite, Fe oxyhydroxides (Ma et al., 2007). He et al. (2022): light Ti accumulates above 3 m, heavy Ti leaves with fluids (Rayleigh-type fractionation); ilmenite resists and carries light Ti. Coordinates published as "110° 38 71 E, 19° 34 74 N", read here as decimal minutes.
δ49Ti in ‰ (per mil) Values of the same system
Standard : OL-Ti
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.003 ± 0.035 ‰ | −0.068 / 0.039 ‰ | 9 | laterite, 0.5 to 3 m depth (bulk) Mean and standard deviation recalculated from 9 analyses, -0.068 to +0.039 (HK06-1 -0.042; HK06-2 -0.009; HK06-3 -0.068; HK06-4 +0.013; HK06-5 +0.022; HK06-6 -0.019; HK06-7 +0.016; HK06-8 +0.019; HK06-9 +0.039). Ti-depleted zone (τTh,Ti down to -37 %), lighter than the basalt (+0.052 and +0.039 ‰). Depths: HK06-1 0.5 m; HK06-2 0.9 m; HK06-3 1.3 m; HK06-4 1.6 m; HK06-5 1.9 m; HK06-6 2.2 m; HK06-7 2.5 m; HK06-8 2.8 m; HK06-9 3.0 m. | He et al. (2022), Mass-dependent fractionation of titanium stable isotopes during intensi… |
| 0.052 ± 0.022 ‰ | 0.017 / 0.076 ‰ | 10 | saprolite, 3.2 to 4.5 m depth (bulk) Mean and standard deviation recalculated from 10 analyses, +0.017 to +0.076 (HK06-10 +0.057; HK06-12 +0.017; HK06-13 +0.019; HK06-14 +0.030; HK06-15 +0.076; HK06-16 +0.076; HK06-17 +0.070; HK06-18 +0.065; HK06-19 +0.058; HK06-20 +0.047). Ti retained or slightly accumulated (τTh,Ti -9 to +9 %), δ49Ti close to the basalt or slightly heavier. HK06-11 is not published. Depths: HK06-10 3.2 m; HK06-12 3.5 m; HK06-13 3.7 m; HK06-14 3.8 m; HK06-15 4.0 m; HK06-16 4.1 m; HK06-17 4.2 m; HK06-18 4.3 m; HK06-19 4.4 m; HK06-20 4.5 m. | He et al. (2022), Mass-dependent fractionation of titanium stable isotopes during intensi… |
| 0.333 ± 0.159 ‰ | 0.108 / 0.54 ‰ | 13 | crystalline Fe oxyhydroxide fraction (sequential extraction) Mean and standard deviation recalculated from 13 analyses, +0.108 to +0.540 (HK06-1 +0.524; HK06-3 +0.484; HK06-5 +0.540; HK06-7 +0.209; HK06-8 +0.419; HK06-9 +0.256; HK06-10 +0.115; HK06-12 +0.108; HK06-13 +0.148; HK06-14 +0.291; HK06-16 +0.431; HK06-18 +0.310; HK06-20 +0.500). This fraction holds 5 to 26 % of sample Ti (Table 3) and concentrates heavy Ti; 2SD 0.040 to 0.065 ‰. | He et al. (2022), Mass-dependent fractionation of titanium stable isotopes during intensi… |
| −0.068 ± 0.06 ‰ | −0.165 / 0.043 ‰ | 13 | residual fraction (kaolinite, gibbsite, ilmenite, quartz) Mean and standard deviation recalculated from 13 analyses, -0.165 to +0.043 (HK06-1 -0.050; HK06-3 -0.045; HK06-5 -0.073; HK06-7 -0.165; HK06-8 -0.089; HK06-9 -0.043; HK06-10 -0.151; HK06-12 +0.043; HK06-13 +0.022; HK06-14 -0.087; HK06-16 -0.039; HK06-18 -0.129; HK06-20 -0.084). This fraction holds 72 to 94 % of Ti. The recalculated balance (oxides + residue) sometimes departs from measured δ49Ti: HK06-7 -0.083 calculated against +0.016 measured, HK06-10 -0.075 against +0.057. | He et al. (2022), Mass-dependent fractionation of titanium stable isotopes during intensi… |
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- Luchengjiang soil profiles, outside the Lanmuchang mining zone China
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Cite this page
IsoFind Atlas (2026). Lateritic profile on basalt, northern Hainan, isotope signatures. https://www.isofind.tech/isotopes/en/sites/profil-lateritique-sur-basalte-du-nord-de-hainan/ (accessed 2026-10-20).
@misc{isofind2026lateriticprofileonbasaltnorth,
title = {Lateritic profile on basalt, northern Hainan, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/profil-lateritique-sur-basalte-du-nord-de-hainan/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20