Sequential growth of early diagenetic freshwater siderites in the Holocene coastal deposits, Korea SCIE SCOPUS

Cited 19 time in WEB OF SCIENCE Cited 19 time in Scopus
Title
Sequential growth of early diagenetic freshwater siderites in the Holocene coastal deposits, Korea
Author(s)
Lim, DI; Jung, HS; Yang, SY; Yoo, HS
KIOST Author(s)
Lim, Dhongil(임동일)Jung, Hoi Soo(정회수)
Publication Year
2004-07-01
Abstract
Spherulitic siderite grains ranging from 100 to 250 lint in diameter occur abundantly in a sediment layer, which is almost 8600 years old, in Namyang Bay, on the west coast of Korea. These large siderite grains consist predominantly of FeCO3 (average 65%) and MnCO3 (average 22%) and have low Mg/Ca and Mg/Fe ratios. Compositional scatter plots, together with the high Mn and low Mg contents, indicate that meteoric pore water was mainly involved in the siderite precipitation. Examination of the siderite grains with an electron microprobe reveals a systematic, micron-scale, center-to-margin compositional variation within individual grains. Three zones are recognized on the basis of the compositional variations: Zone I (center) in which Mn decreases and Fe increases, Zone II (intermediate) in which Mn increases and Fe decreases, and Zone III (outer) in which both Mn and Fe decrease and Mg increases. This zoning is interpreted as a result of depth-related early diagenetic reactions with different Fe, Mn, and Mg concentrations in the sediment pore waters. Meanwhile, compositional mapping of spherulitic grains implies that a siderite grain consists of numerous tiny siderite precipitates. Such dust-like tiny siderite precipitates appear to be adhered to the large spherulitic siderite grain. In some cases, large siderite grains are adjoined together and occurred as a siderite aggregate. We suggest that a spherulitic siderite grain is growing sequentially by adhering of numerous tiny siderite precipitates formed in each diagenetic zone onto the siderite grain like the formation of a snowball. (C) 2004 Elsevier B.V. All rights reserved.
ISSN
0037-0738
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5233
DOI
10.1016/j.sedgeo.2004.05.002
Bibliographic Citation
SEDIMENTARY GEOLOGY, v.169, no.1-2, pp.107 - 120, 2004
Publisher
ELSEVIER SCIENCE BV
Subject
PORE-WATER; ISOTOPIC COMPOSITION; CONCRETIONARY SIDERITE; SPHERULITIC SIDERITES; ELEMENTAL COMPOSITION; YELLOW SEA; SEDIMENTS; GEOCHEMISTRY; ENVIRONMENT; CHEMISTRY
Keywords
spherulitic siderite; freshwater system; compositional zoning; diagenetic sequential growth
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine Geochemistry,Paleoceanography,Marine Pollution,해양지화학,고해양학,해양오염학

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