Nature and origin of organic matter in carbonates from speleothems, marine cements and coral skeletons

被引：96

作者：

Ramseyer, K ^{[1
]}

Miano, TM ^{[1
]}

DOrazio, V ^{[1
]}

Wildberger, A ^{[1
]}

Wagner, T ^{[1
]}

Geister, J ^{[1
]}

机构：

[1] UNIV BARI, IST CHIM AGR, I-70126 BARI, ITALY

来源：

ORGANIC GEOCHEMISTRY | 1997年 / 26卷 / 5-6期

关键词：

fluorescence spectroscopy; SEM; humic substances; fulvic acids; submicroscopic inclusions in carbonates; speleothems; corals;

D O I：

10.1016/S0146-6380(97)00008-9

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Organic matter in speleothem calcite, marine carbonate cements and aragonitic coral skeletons was studied to determine its location, molecular structure, functionality and effect on mineral growth. SEM analyses showed that inorganically precipitated carbonates incorporate, during growth, adsorbed organic matter between submicroscopic subunits of the crystals whereas biologically secreted carbonates incorporate biogenic tissue between the crystals. Molecular fluorescence spectroscopy indicated that low molecular weight fulvic acids are the most important constituents of the organic matter. The fulvic acids are probably derived from soils (speleothem calcite), dissolved organic matter (marine carbonates) and biological decay products (aragonitic coral skeleton). (C) 1997 Elsevier Science Ltd.

引用

页码：361 / 378

页数：18

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