Observation of the dissolution process of Globigerina bulloides tests (planktic foraminifera) by X-ray microcomputed tomography
Observation of the dissolution process of Globigerina bulloides tests (planktic foraminifera) by X-ray microcomputed tomography
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DOI：
10.1002/2014pa002639
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发表时间：
2015-04-01
期刊：
影响因子：
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通讯作者：
Okazaki, Yusuke
中科院分区：
文献类型：
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作者：
Iwasaki, Shinya;Kimoto, Katsunori;Okazaki, Yusuke
我们进行了一个9天的溶解实验，测试的pH值为6.70.1的水不饱和的方解石的反硝化有孔虫Globigerina bulloides。通过X射线显微计算机断层扫描（XMCT）定量评价了溶出过程的初始阶段，该阶段无法从试验的表面结构中识别。XMCT显示了三种不同的测试结构：早期发育的方解石形成于G.泡状体、内部方解石层和外部方解石层。用扫描电镜观察试验区超微结构，用CT值评价试验区密度分布。早期发育的方解石和内方解石层的CT值较低（500-1300;低密度，多孔）并且对溶解敏感，而外方解石层的CT值较高（
We performed a 9 day dissolution experiment with tests of the planktic foraminifer Globigerina bulloides at pH 6.70.1 in water undersaturated with respect to calcite. The initial stage of the dissolution process, which is not recognizable from the surface structure of the tests, was quantitatively evaluated by X-ray microcomputed tomography (XMCT). XMCT revealed three distinct test structures: early-developed calcite formed during the juvenile stage of G. bulloides, an inner calcite layer, and an outer calcite layer. The test ultrastructure was observed by scanning electron microscopy, and CT number evaluated the density distribution in the test. The early-developed calcite and inner calcite layer had low CT numbers (500-1300; low density, porous) and were sensitive to dissolution, whereas the outer calcite layer had high CT numbers (