Microstructures in carbonates from the Alnø and Fen carbonatites
Microstructures in carbonates from the Alnø and Fen carbonatites
复制标题
Alnø 和 Fen 碳酸岩中碳酸盐的微观结构
DOI：
10.1007/bf00380168
复制
发表时间：
1984
影响因子：
3.5
通讯作者：
H. Wenk
中科院分区：
文献类型：
--
作者：
D. J. Barber;H. Wenk
本文用光学显微镜和透射电子显微镜，结合X射线衍射和电子探针分析，研究了阿宁和汾地区碳酸盐岩样品中碳酸盐和有关第二相矿物的性质，发现方解石、白云石和铁白云石具有双相显微结构。方解石材料的相干条带出现在白云石和铁白云石中，而方解石颗粒通常含有板状和有时棒状沉淀物的精细分散。方解石和白云石经常以相同的晶格取向接触，本文首次报道了白云石中方解石的两相结构，认为它是最近报道的钙质沉积方解石中调制显微结构的高温模拟（Wenk等人，1983）。
The nature of carbonates and related second phase minerals in carbonatite samples from the Alnø and Fen regions has been studied by optical and transmission electron microscopy, aided by X-ray diffraction and electron microprobe analysis.Calcite, dolomite and ankerite have been found to exhibit two phase microstructures. Coherent ribbons of calcitic material occur in dolomite and ankerite, while the calcite grains commonly contain a fine dispersion of plate-like and sometimes rod-like precipitates. Calcite and dolomite frequently occur in contact with the same crystallographic lattice orientation, the small lattice mismatch being indicated by moiré patterns at the grain boundaries and occasional misfit dislocations.The two-phase structure of calcite in dolomite reported for the first time in this paper is thought to be a high temperature analogue of the modulated microstructures reported recently in calcian sedimentary dolomites (Wenk et al. 1983).