Mixing between chemically variable primitive basalts creates and modifies crystal cargoes.
Mixing between chemically variable primitive basalts creates and modifies crystal cargoes.
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DOI：
10.1038/s41467-021-25820-z
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发表时间：
2021-09-17
影响因子：
16.6
通讯作者：
Holtz F
中科院分区：
文献类型：
--
作者：
Neave DA;Beckmann P;Behrens H;Holtz F
玄武岩晶体货物通常保存着地幔衍生的化学变异性的记录，这些记录已被岩浆混合从其载体液体中抹去。然而，尽管普遍存在初级熔体成分的化学可变性和喷发的结晶货物中混合引起的不平衡，但类似原始但在其他方面化学变化的岩浆之间混合的后果仍然知之甚少。在这里，我们报道了对来自不同地幔来源的原始冰岛熔岩的类似物进行的岩浆-岩浆反应实验的观察，以确定它们的结晶物质对混合诱导的化学不平衡的反应。我们实验产品中的化学可变性主要由熔体中的主要元素扩散控制，这些扩散改变了相平衡，并在最初斜长石饱和的区域内引发斜石再吸收。因此，化学变化的玄武岩岩浆之间的等温混合可能会通过解锁富含斜长石的泥浆、驱动吸收、(重新)结晶和固态扩散，在创造和修改晶体货物方面发挥重要的作用，但以前没有得到充分认识。化学成分不同的原始玄武岩在从地幔上升的过程中发生混合。在这里，作者展示了岩浆-岩浆反应实验的观察结果，这些实验证明了化学变量不同的玄武岩之间的等温混合如何创造和改变了在海洋环境中喷发的结晶货物。
Basaltic crystal cargoes often preserve records of mantle-derived chemical variability that have been erased from their carrier liquids by magma mixing. However, the consequences of mixing between similarly primitive but otherwise chemically variable magmas remain poorly understood despite ubiquitous evidence of chemical variability in primary melt compositions and mixing-induced disequilibrium within erupted crystal cargoes. Here we report observations from magma–magma reaction experiments performed on analogues of primitive Icelandic lavas derived from distinct mantle sources to determine how their crystal cargoes respond to mixing-induced chemical disequilibrium. Chemical variability in our experimental products is controlled dominantly by major element diffusion in the melt that alters phase equilibria and triggers plagioclase resorption within regions that were initially plagioclase saturated. Isothermal mixing between chemically variable basaltic magmas may therefore play important but previously underappreciated roles in creating and modifying crystal cargoes by unlocking plagioclase-rich mushes and driving resorption, (re-)crystallisation and solid-state diffusion. Chemically variable primitive basalts undergo mixing during ascent from the mantle. Here the authors show observations from magma–magma reaction experiments which demonstrate how isothermal mixing between chemically variable basalts creates and modifies crystal cargoes erupted in oceanic settings.
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影响因子：
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