Origin of terra rossa over dolomite on the Yunnan-Guizhou Plateau, China

Feng, Jing-Chun; Cui, Zhijiu; Zhu, Liping

doi:10.2343/geochemj.1.0014

Cited by 27 publications

(18 citation statements)

References 45 publications

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“…The sampling site lies at the pediment of a karst hill with TR up to 5.4 m thick overlying Early Triassic dolomite (Feng et al, 2009a).…”

Section: Geological Setting and Data On The Tr Profilementioning

confidence: 99%

“…1). Horizon I (0-2.5 m) is silty clay and clay: light-brownish-grey soil and anthropogenic slag deposits (0-0.1 m), silty clay, mainly reddish-yellow (0.1-1.2 m), and reddish-yellow clay (1.2-2.5 m) that exhibits Feng et al, 2009a).…”

Section: Geological Setting and Data On The Tr Profilementioning

confidence: 99%

“…The fresh dolomite contained 0.69% insoluble residue (IR) on average following acid treatment, consisting of illite, illite/smectite mixed-layer minerals, quartz, hematite, pyrite, and small amounts of feldspar (Feng et al, 2009a).…”

Section: Fig 1 (A) Simplified Stratigraphic Section Of Tr Profile Amentioning

confidence: 99%

“…However, XRD analysis of the FMC samples did not reveal distinct peaks for Mn-oxide minerals, probably due to the poorly crystallized Mn mineral phase. Feng et al (2009a) suggested that the TR in the Dashandong profile is probably an in situ weathering crust, based on content, grain size distribution, morphology and δ 18 O of the contained quartz; however, the parent rocks are vertically heterogeneous. The TR partly consists of the insoluble residue of the underlying dolomite, enriched by elements imported by percolating external soil-water and/or from pre-existing TR at the top of the profile.…”

Section: Fig 1 (A) Simplified Stratigraphic Section Of Tr Profile Amentioning

confidence: 99%

“…FMCs occur in the TR (Feng et al, 2009a). The main objectives of the study were to investigate (1) the trace element composition in the FMCs and TR matrix, and their distribution in the profile; (2) the enrichment behavior of trace elements in the FMCs compared to the surrounding TR matrix; (3) specific inter-element associations between Mn and Fe and the trace elements in the FMCs; and (4) the potential desorption of trace elements from the FMCs and TR due to human activity.…”

Section: Introductionmentioning

confidence: 99%

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Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption

et al. 2012

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The distributions of trace elements in ferromanganese concretions (FMCs) and the surrounding terra rossa (TR) matrix overlying dolomite have been examined to extend our understanding of their mobilization, redistribution and fractionation during karst weathering and pedogenesis. This study demonstrates that the characteristics of trace elements in TR have been severely overprinted by weathering and pedogenetic processes. The composition of trace elements in FMCs within TR soil profiles varies greatly with depth. The concentrations of Be, Ni, Cu, Zn, As and Bi in FMCs fluctuate and tend to increase with depth; other trace element concentrations fluctuate in the profile but show no clear trend. The toxic elements Cr, As, Cd, Tl and Pb, as well as Co, are significantly enriched in FMCs relative to the surrounding TR matrix: arsenic exhibits strong affinity with Fe, but Cr and Cd contents are not significantly correlated with either Mn or Fe. Correspondingly, Co, Tl and Pb are related to the Mn in FMCs rather than the Fe. In FMCs, trace element distribution and partitioning in the Mn-Fe phases are governed by the location-specific formational pedoenvironment, with the weathering front etching downwards. Experiments with simulated acid rain indicate that desorption of elements from FMCs is generally pH-dependent regardless of the variation of the released amounts and their desorbability. Moreover, it seems that toxic elements bonded to Mn-phase were easily desorbed from FMCs. As a result, the bioavailability, mobility and activity of some toxic elements in FMCs and TR are potentially increased in field areas experiencing severe soil erosion and acid rain.

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“…The sampling site lies at the pediment of a karst hill with TR up to 5.4 m thick overlying Early Triassic dolomite (Feng et al, 2009a).…”

Section: Geological Setting and Data On The Tr Profilementioning

confidence: 99%

Section: Geological Setting and Data On The Tr Profilementioning

confidence: 99%

Section: Fig 1 (A) Simplified Stratigraphic Section Of Tr Profile Amentioning

confidence: 99%

Section: Fig 1 (A) Simplified Stratigraphic Section Of Tr Profile Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption

et al. 2012

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Pennsylvanian–earlyPermianpalaeokarst development on theYangtzePlatform,South China, and implications for the regional sea‐level history

et al. 2017

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The Pennsylvanian to lower Permian succession at Madiyi, South China, represents a nearshore mixed siliciclastic‐carbonate system characterized by cyclic sedimentation patterns along a depth gradient from continental siliciclastics to marine open platform carbonates. Various palaeokarst features related to subaerial exposure are widely distributed. Additionally, pedogenesis was pervasive. The identification of twenty‐eight sedimentary cycles grouped into five sequences allows the reconstruction of a relative sea‐level curve. The cycles represent higher frequency changes superimposed on the long‐term evolution. After the initial transgression, the sea level remained relatively low in the late Bashkirian to early Moscovian. Then, it rose stepwise until a major drop occurred in the late Moscovian. Afterwards, the sea level rose again, but marine sedimentation ceased during at least the early Kasimovian. The area was flooded in the late Kasimovian, and the sea level rose until a late Gzhelian sea‐level drop. The subsequent marine sequence contains uppermost Gzhelian to upper Asselian deposits, which are capped by lower Permian continental facies associated with a major regional regression. Shallow to deeper marine sedimentary settings recorded high‐frequency sea‐level changes throughout South China during the late Bashkirian to Asselian. The main transgression–regression cycles are clearly associated with different depositional settings during several time intervals. Furthermore, the good correlations among South China, Ukraine, and the U.S. Mid‐continent are rooted in the impact of Gondwanan glaciations on the global sedimentation patterns. However, not all changes at Madiyi are the result of glacio‐eustatic sea‐level fluctuations; some are related to the local subsidence history and the rise of the Xuefeng Uplift.

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An Indigenous Soil Bacterium Facilitates the Mitigation of Rocky Desertification in Carbonate Mining Areas

Zhang

Guo

2017

Land Degrad Dev

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Carbonate minerals are extensively distributed across China, and their special rock structures make them vulnerable to land damage through mining, leading to rocky desertification. Soil microorganisms play an important role in mineral weathering. However, little is known about the utilization of the mineral‐weathering microorganisms to alleviate the problem of rocky desertification in mines. In the present study, the mineral‐solubilizing bacterium NL‐11 was isolated from soil around weathered dolostones and identified as Bacillus thuringiensis based on the Biolog identification system and 16S rDNA sequence analysis. The mineral dissolution experiments revealed that inoculation with the live bacterium significantly increased the mineral sample dissolution via significantly enhancing Ca and Mg release, with increase values of 303·27 and 50·55 mg L−1 respectively, compared with that with the inactivated bacterium. Moreover, the acetic acid secreted by strain NL‐11 markedly decreased the size of particle diameter (quantified with a laser diffraction particle size analyser) through reducing pH value. The eroded traces were observed by scanning electron microscopy analysis, and the results further verified the erosional effects of this strain. In addition, this bacterium contributed to the establishment and proliferation of plants by providing nutrient elements, such as phosphorus (P) and potassium (K). Our study not only provided an efficient bacterial strain NL‐11 but also enriched the technologies to mitigate problems associated with ecological restorations of carbonate mines. Copyright © 2017 John Wiley & Sons, Ltd.

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Origin of terra rossa over dolomite on the Yunnan-Guizhou Plateau, China

Cited by 27 publications

References 45 publications

Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption

Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption

Pennsylvanian–earlyPermianpalaeokarst development on theYangtzePlatform,South China, and implications for the regional sea‐level history

An Indigenous Soil Bacterium Facilitates the Mitigation of Rocky Desertification in Carbonate Mining Areas

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