...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Mineralogy and Sr-Mg geochemistry of charophyte carbonates: a new tool for paleolimnological research
【24h】

Mineralogy and Sr-Mg geochemistry of charophyte carbonates: a new tool for paleolimnological research

机译：炭素碳酸盐矿物的矿物学和Sr-Mg地球化学：古湖泊学研究的新工具

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

The carbonate biominerals formed in the oogonial cells and on stems of charophytes reveal intra-specific and species-to-species variations within the genus Chara. Calcite, high-magnesian calcite (HMC) and aragonite may be present in both oogonium and stem calcifications, and for the first time evidence is presented of polymineral calcification (HMC + aragonite) within single oogonial cells. The data indicate strong specific differences in the biological mechanisms of mineralization within this group of plants. Among the various species of the genus Chara studied, there is no correlation between the charophyte carbonate mineralogy and the salinity of water where they formed: calcite, HMC and aragonite may all be present in charophyte calcifications formed in low-salinity waters. On the contrary, there is an overall relationship between the mineralogy of these carbonates and the Mg/Ca ratio of the water in which they formed. Sr content in charophyte calcite and high Mg-calcite reflect directly the Sr/Ca ratio of the host water, whereas Mg content in these carbonates probably depends on the temperature and the Mg/Ca ratio of the water. Partitioning coefficients for Mg and Sr for some widespread species are discussed. Our results indicate that charophyte carbonates may be used as paleohydrochemical proxies and imply that special attention must be paid to the mineralogical control of charophyte carbonates when they are to be used in isotopic studies.
机译：在卵母细胞和叶藻茎上形成的碳酸盐生物矿物揭示了Chara属内种内和种间的差异。方解石，高镁方解石（HMC）和文石可能同时存在于卵形钙化和干钙化中，并且首次出现了单个卵细胞内多矿物钙化（HMC +文石）的证据。数据表明在这组植物中矿化的生物学机制存在很大的特定差异。在所研究的Chara属的各种物种中，碳酸盐的碳藻石矿物学与它们所形成的水的盐度之间没有关联：方解石，HMC和文石都可能存在于低盐度水中形成的钙镁石钙化物中。相反，这些碳酸盐的矿物学与它们所形成的水的Mg / Ca之比之间存在总体关系。方解石和高镁方解石中的Sr含量直接反映了宿主水的Sr / Ca比，而这些碳酸盐中的Mg含量可能取决于温度和水的Mg / Ca比。讨论了一些广泛分布物种的Mg和Sr分配系数。我们的结果表明，碳藻碳酸盐可以用作古水化学代理，这意味着当将碳藻碳酸盐用于同位素研究时，必须特别注意碳酸盐的矿物学控制。

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