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首页> 外文期刊>Contributions to Mineralogy and Petrology >Competing effects of crystal chemistry and silicate melt composition on trace element behavior in magmatic systems: insights from crystal/silicate melt partitioning of the REE, HFSE, Sn, In, Ga, Ba, Pt and Rh
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Competing effects of crystal chemistry and silicate melt composition on trace element behavior in magmatic systems: insights from crystal/silicate melt partitioning of the REE, HFSE, Sn, In, Ga, Ba, Pt and Rh

机译：晶体化学和硅酸盐熔融组合物对岩岩系统痕量元素行为的竞争效果：晶体/硅酸盐熔体分配的见解，HFSE，Sn，In，Ga，Ba，Pt和Rh

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摘要

We present new partition coefficients for the REE, HFSE, Sn, In, Ga, Ba, Pt and Rh between clinopyroxene, olivine and basaltic melt as a function of crystal chemistry and melt composition at temperatures of 11901300 degrees C and 1-bar pressure. Two components, namely Al2O3 and Na2O, were chosen to be investigated since they are known to affect the structure of silicate melts and especially clinopyroxene crystal chemistry. The amount of Al-[4]' in clinopyroxene will result in an increase of D-i(cpx/melt) even after applying a correction factor to account for the effect of melt polymerization. Moreover, the positive correlation between Al-[4] and D-i(cpx/melt) is not restricted to the REE, but also applies for Sn, Ga, In, and Ba. The addition of up to 2.6 wt% Na2O to the silicate melt universally increases the D-i(cpx/melt) without any concomitant change in crystal chemistry or a significant effect in melt polymerization. This compositional effect is likely due to the ability of Na to break REE-Al complexes in the melt. Our results emphasize the importance of considering all variables that affect the behavior of trace elements in magmatic systems before applying the lattice strain model and derive meaningful results for the changes in the parameters of the crystallographic sites.
机译：我们为临床，橄榄石和玄武岩熔体之间的REE，HFSE，Sn，，Ga，Ba，Pt和Rh的新分区系数作为晶体化学和熔融组合物在11901300℃和1杆压力的温度下的函数。选择两个组分，即Al 2 O 3和Na 2 O，因为已知它们会影响硅酸盐熔体的结构，特别是临床曲折晶体化学。即使在施加校正因子以考虑熔融聚合的影响后，临床中的AL-[4]'的量也会导致D-1（CPX /熔体）增加。此外，AL-[4]和D-I（CPX / MELT）之间的正相关性不限于REE，而且还适用于SN，GA，IN和BA。向硅酸盐熔体加入高达2.6wt％Na 2 O，普遍增加D-1（CPX /熔体）而没有任何伴随的晶体化学变化或在熔融聚合中的显着效果。这种组成效应可能是由于Na在熔体中破坏Ree-Al络合物的能力。我们的结果强调了考虑在应用晶格应变模型之前影响岩石系统中的跟踪元素行为的所有变量，并导出结晶位点参数的变化的有意义的结果。

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