Are rare earth elements mobile during spilitisation?
Are rare earth elements mobile during spilitisation?
复制标题
稀土元素在分裂过程中会移动吗？
DOI：
10.1038/267038a0
复制
发表时间：
1977
期刊：
影响因子：
64.8
通讯作者：
P. Henderson
中科院分区：
文献类型：
--
作者：
P. Hellman;P. Henderson
通过对海底玄武岩、细碧岩和热液蚀变玄武岩1 -5、蛇绿岩6、7、地槽3、8和低级至绿片岩相区9中稀土元素（REE）的研究，人们逐渐接受了稀土元素在岩石蚀变过程中是不活动的。这一结论导致使用某些丰度比，特别是La/Sm和La/Yb，作为母岩浆类型和成因的指标。尽管有些人认为稀土元素，如La和Ce，在海水/岩石相互作用、热液蚀变或火成岩细碧化过程中可能是移动的，但稀土元素继续以类似于Ti、Y和Zr（参考文献11）的方式进行处理（例如参考文献6和7）。在这里，我们通过对变化不定的拉斑玄武岩流的分析表明，在某些情况下，细碧化可能会影响REE丰度及其球粒陨石标准化模式。
FROM the study of rare earth elements (REE) in basalts, spilites and hydrothermally altered basalts in the ocean floor1–5, ophiolites6,7, geosynclines3,8and low-grade to greenschist facies regions9it has come to be accepted that the REE are immobile during rock alteration. This conclusion has led to the use of certain abundance ratios, particularly La/Sm and La/Yb, as indicators of parent magma type and genesis. Despite some suggestions2,10that REE, such as La and Ce, may be mobile during sea-water/rock interaction, hydrothermal alteration or spilitisation of igneous rocks, the REE continue to be treated (e.g. refs 6 and 7) in an analgous fashion to Ti, Y and Zr (ref. 11). Here we show from analyses of a variably altered tholeiite flow that spilitisation may, in some circumstances, affect the REE abundances and their chondrite normalised pattern.