Feasibility of absolute-age determination for potassium-carrying manganese minerals

Chukhrov, F. V.; Shanin, L.L.; Yermilov, L.P.

doi:10.1080/00206816609474282

Cited by 15 publications

(3 citation statements)

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“…The first applications of the K‐Ar dating method to cryptomelane were very promising despite problems of phase mixing and difficulties for extracting pure samples [ Chukhrov et al , 1966; Yashvili and Gukasyan , 1974; Varentsov and Golovin , 1987; Segev et al , 1991]. The small quantities required for 39 Ar‐ 40 Ar laser probe dating reduce the mixing risks [ Ruffet et al , 1996], which are further lessened by a precise sampling [ Hénocque et al , 1998].…”

Section: Material Sampling and Analytical Methodsmentioning

confidence: 99%

Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The ³⁹Ar‐⁴⁰Ar dating of supergene K‐Mn oxides

et al. 2008

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[1] Chemical weathering and mechanical erosion are first-order processes of long-term tropical morphogenesis, which is still poorly deciphered for lack of time constraints. We address this issue by laser probe 39 Ar age groups with d 18 O and eustatic curves allow definition of the different stages of morphogenesis. Paleocene-Eocene ages (59-45 Ma) bracket a greenhouse period propitious to bauxitic weathering. The lack of significant ages between $45 and 29 Ma characterizes a period dominated by mechanical erosion, during which detrital sediments, including lateritic materials, were accumulated in intracratonic basins allowing the exhumation of a new lateritic landsurface. Two major weathering periods separated by a second erosion episode (24-18 Ma) are also depicted at the end of Oligocene (29-24 Ma) and lower to mid-Miocene (18-11.5 Ma) in the upper domain, during which newly shaped land surfaces conspicuously weathered. The shorter-weathering and erosion episodes recorded in the lower domain from $18 to $2.9 Ma led to the final geomorphic changes that were conducive to the formation of glacis. The preservation of old cryptomelane (59-45 Ma) in the upper part of the ore deposit indicates a Cenozoic denudation limited to the erosion of previous bauxites, and partly, of ferricretes.

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Section: Material Sampling and Analytical Methodsmentioning

confidence: 99%

Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The ³⁹Ar‐⁴⁰Ar dating of supergene K‐Mn oxides

et al. 2008

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“…These minerals contain sufficiently high K contents (in weight percent level) in their tunnel structures and have been considered as ideal phases for dating weathering processes using the K-Ar (Chukhrov et al, 1966;Yashvili and Gukasyan, 1973) and 40 Ar/ 39 Ar methods (Vasconcelos et al, 1992(Vasconcelos et al, , 1994Lippolt and Hautmann, 1995;Ruffet et al, 1996). The utilization of laser-heating 40 Ar/ 39 Ar technique, which obviates the need for large quantities of samples and thus minimizes the contamination problems, has significantly advanced the study of weathering geochronology (Vasconcelos et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Deng

Vasconcelos

et al. 2014

Geochimica et Cosmochimica Acta

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Please cite this article as: Deng, X-D., Li, J-W., Vasconcelos, P.M., Cohen, B.E., Kusky, T.M., Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/ j.gca. 2014.04.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Despite the long-established recognition that supergene minerals are suitable for geochronology (Strutt 1910;Chukhrov et al 1966Chukhrov et al , 1969, they have been only recently used to date minerals in soils and weathering profiles thanks to two main reasons:…”

Section: Introductionmentioning

confidence: 99%

Dating constituent formation in soils to determine rates of soil processes: A review

2009

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Feasibility of absolute-age determination for potassium-carrying manganese minerals

Cited by 15 publications

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Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The ³⁹Ar‐⁴⁰Ar dating of supergene K‐Mn oxides

Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The ³⁹Ar‐⁴⁰Ar dating of supergene K‐Mn oxides

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Dating constituent formation in soils to determine rates of soil processes: A review

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Feasibility of absolute-age determination for potassium-carrying manganese minerals

Cited by 15 publications

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Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The 39Ar‐40Ar dating of supergene K‐Mn oxides

Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The 39Ar‐40Ar dating of supergene K‐Mn oxides

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Dating constituent formation in soils to determine rates of soil processes: A review

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Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The ³⁹Ar‐⁴⁰Ar dating of supergene K‐Mn oxides

Chemical and physical erosion rhythms of the West African Cenozoic morphogenesis: The ³⁹Ar‐⁴⁰Ar dating of supergene K‐Mn oxides