Geochemical features of a soil chronosequence developed on basalt in Hainan Island, China
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
2007
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| _version_ | 1876466289420009472 |
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| author | Gan-Lin Zhang |
| author_facet | Gan-Lin Zhang |
| contents | Geochemical features of a soil chronosequence developed on basalt in Hainan Island, China Gan-Lin Zhang Ji-Hua Pan Cheng-Min Huang Zi-Tong Gong Ciencias de la Tierra China basalt Hainan Island soil geochemistry element migration Hainan Island is located in the South China Sea. Basalts of different geological ages are widelydistributed in the north of the island, and soils developed from them form a well dated soil chronosequence.The absolute ages of basalt from which soils have developed varied from 1.0×104 a to 1.81 Ma. A fewindicative soil features, especially typical geochemical features, were studied and related to the stagesof soil development. Relative depletion/enrichment ratios of macroelements and microelements, as wellas of rare earth elements (REE), were calculated and several indices were proposed to illustrate thedevelopment of the soil chronosequence.The study found that Fe and Al were relatively enriched, while Ca, Mg, K and Na as well as Si werestrongly lost during rock weathering and soil formation. Indices based on soil macroelements, such as thechemical index of alteration (CIA), the chemical index of weathering (CIW), the silicon-aluminum ratio(Sa), and the Silicon-aluminum-iron ratio (Saf) could not adequately express the sequential weatheringdegree of the chronosequence. The weathering index (WI) gave a good relationship with soil age andcan be taken as an index of soil development. Ba/Nb correlated significantly with soil age and can beused as an indicator of soil development. REE content increased linearly with soil age so it can expressthe degree of soil development. The relative depletion rates of major elements showed that Si was lost upto 80% of the original content before 1 Ma and remained in constant concentrations afterwards. Easilymobilized elements were lost quickly during the initial stage of weathering and more than 90% of themwere depleted within the first 1.0×104 a 2007 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57224211 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.2 Vol.24 |
| format | Artículo científico |
| id | redalyc_57224211 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Geochemical features of a soil chronosequence developed on basalt in Hainan Island, China Gan-Lin Zhang Ciencias de la Tierra China basalt Hainan Island soil geochemistry element migration Geochemical features of a soil chronosequence developed on basalt in Hainan Island, China Gan-Lin Zhang Ji-Hua Pan Cheng-Min Huang Zi-Tong Gong Ciencias de la Tierra China basalt Hainan Island soil geochemistry element migration Hainan Island is located in the South China Sea. Basalts of different geological ages are widelydistributed in the north of the island, and soils developed from them form a well dated soil chronosequence.The absolute ages of basalt from which soils have developed varied from 1.0×104 a to 1.81 Ma. A fewindicative soil features, especially typical geochemical features, were studied and related to the stagesof soil development. Relative depletion/enrichment ratios of macroelements and microelements, as wellas of rare earth elements (REE), were calculated and several indices were proposed to illustrate thedevelopment of the soil chronosequence.The study found that Fe and Al were relatively enriched, while Ca, Mg, K and Na as well as Si werestrongly lost during rock weathering and soil formation. Indices based on soil macroelements, such as thechemical index of alteration (CIA), the chemical index of weathering (CIW), the silicon-aluminum ratio(Sa), and the Silicon-aluminum-iron ratio (Saf) could not adequately express the sequential weatheringdegree of the chronosequence. The weathering index (WI) gave a good relationship with soil age andcan be taken as an index of soil development. Ba/Nb correlated significantly with soil age and can beused as an indicator of soil development. REE content increased linearly with soil age so it can expressthe degree of soil development. The relative depletion rates of major elements showed that Si was lost upto 80% of the original content before 1 Ma and remained in constant concentrations afterwards. Easilymobilized elements were lost quickly during the initial stage of weathering and more than 90% of themwere depleted within the first 1.0×104 a 2007 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57224211 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.2 Vol.24 |
| title | Geochemical features of a soil chronosequence developed on basalt in Hainan Island, China |
| topic | Ciencias de la Tierra China basalt Hainan Island soil geochemistry element migration |
| url | https://www.redalyc.org/articulo.oa?id=57224211 |