Rodingite formation from diorite in the Samothraki ophiolite, NE Aegean, Greece
Rodingite formation from diorite in the Samothraki ophiolite, NE Aegean, Greece
复制标题
希腊爱琴海东北部 Samothraki 蛇绿岩中闪长岩形成的罗鼎石
DOI：
10.1002/gj.887
复制
发表时间：
2001
影响因子：
1.8
通讯作者：
B. Tsikouras
中科院分区：
文献类型：
--
作者：
K. Hatzipanagiotou;B. Tsikouras
Samothraki 蛇绿岩中的交代事件涉及闪长岩中的罗丁岩的形成，闪长岩是通过富含 H2O 的流体相的相互作用而演化的。以一对空间密切相关的样本为例来研究这一事件。表明该过程的特点是在稀土元素相当固定的相对氧化条件下添加Ca并去除Si和一些大离子亲石元素。萨莫色拉基罗丁岩表现出与其他地方相似的岩性的共同地球化学特征。建议的 T-XCO2 路径涉及一系列顺行反应，该反应发生在 550°C 以下，并稍微富集了流体相中的 CO2。高含水流体的后期渗透将流体相成分推向低二氧化碳潜力，并导致晚期透辉石和维苏威石的形成。或者，如果流体由外部源连续控制，则只有在低于 500°C 的温度下加热才能完成整个过程。版权所有 © 2001 约翰·威利父子有限公司
A metasomatic episode in the Samothraki ophiolite involved the formation of rodingites hosted in a diorite, which evolved by the interaction of an H2O‐rich fluid phase. A pair of samples, which are in close spatial association, was used as an example to investigate this event. It is suggested that this process is characterized by the addition of Ca and the removal of Si and some large ion lithophile elements, under relatively oxidizing conditions where rare earth elements were fairly immobile. The Samothraki rodingites show common geochemical characteristics with similar lithologies elsewhere. A suggested T–XCO2 path involves a prograde reaction series, which occurred below 550°C and slightly enriched the fluid phase in CO2. A late infiltration of a highly hydrous fluid drove the fluid phase composition towards low CO2 potential and led to the formation of late‐stage diopside and vesuvianite. Alternatively, if the fluid had been continuously controlled by an external source, only heating at temperatures below 500°C could have developed the whole process. Copyright © 2001 John Wiley & Sons, Ltd.