• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Facies >Overgrowths of large authigenic apatite crystals on the surface of conodonts from Cantabrian limestones (Spain)
【24h】

Overgrowths of large authigenic apatite crystals on the surface of conodonts from Cantabrian limestones (Spain)

机译：来自坎塔布连石灰岩（西班牙）的牙形石表面上大量自生磷灰石晶体的过度生长

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Conodonts from the middle to upper Paleozoic limestones of the Cantabrian zone commonly show apatite overgrowths. A large crystal microtexture observed under the SEM corresponds to local rims of euhedral to subhedral apatite crystals, which were preceded by the neoformation of smaller crystals. Four types of this microtexture (blocky, columnar, fan, and denticular) are described on different areas of the oral surface of conodonts, whereas dissolution features may be present in the basal cavity area. The distribution of these types of microtexture in different areas of conodont morphology suggests a general trend to neocrystallization, where crystal size increases towards the top of the conodont ornamentation and a chemical gradient controls the crystalline growth. This arrangement is widely related to the surface morphology and to the general conodont histology. The large crystal microtexture grows during early diagenesis from near surface to moderate burial and is linked to the known secondary apatite cement present in natural fused clusters of conodonts. The features described here are also compared to microtextures developed on conodonts during low- to medium-grade metamorphic conditions, where phosphate in solution is available.
机译：坎塔布连地区中上古生界石灰岩的牙形体通常显示磷灰石过度生长。在SEM下观察到的大的晶体微观结构对应于从正面到背面的磷灰石晶体的全面体边缘，在此之前较小晶体的新形成。在牙形石口腔表面的不同区域上描述了四种类型的这种微纹理（块状，柱状，扇形和齿状），而在基底腔区域可能存在溶出特征。这些类型的微观纹理在牙形石形态的不同区域中的分布表明了新晶化的总体趋势，其中晶体尺寸朝向牙形石装饰物的顶部增大，并且化学梯度控制晶体的生长。这种布置与表面形态和普通牙形石的组织学广泛相关。大晶体的微观纹理在成岩过程中从近地表到中等埋藏生长，并与牙形石自然融合簇中存在的已知次生磷灰石胶结物有关。还将此处描述的特征与在中低品位变质条件下在牙形石上形成的微观纹理进行比较，那里存在磷酸盐溶液。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号