Synthesis of refractory metal nuggets and constraints on the thermal histories of nugget‐bearing Ca, Al‐rich inclusions
Synthesis of refractory metal nuggets and constraints on the thermal histories of nugget‐bearing Ca, Al‐rich inclusions
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难熔金属熔核的合成及对含熔核富钙、铝夹杂物热历史的限制
DOI：
10.1111/maps.12440
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发表时间：
2015
影响因子：
2.2
通讯作者：
Ott U.
中科院分区：
文献类型：
--
作者：
Schwander;Schönhense;Ott U.
微小的难熔金属块主要在南极陨石中的富钙铝包裹体（CAIs）中观察到，通常被认为是太阳成分气体的冷凝物。然而，最近对金属块金成分的详细研究及其与冷凝预测的比较表明，所观察到的丰度模式极难以这种方式实现。作为对所提出的替代方案（从硅酸盐液体中沉淀）的测试，我们进行了熔化实验，其中九种不同的难熔金属（熔核组分）在还原条件下与CAI样液体一起相互平衡。当淬火时，类似于CAIs中的那些的矿物由这样的液体形成，包括表现出类似于陨石块的成分和外观的难熔金属块。运行产品及其与含陨石熔核的CAI的比较是在以约1000°/40 s的速率（在1900至900 °C的区间内）冷却富含Ca、Al的液体期间形成难熔金属熔核的证据。为了实现难熔金属熔核和在宿主夹杂物中观察到的织构的形成，在冷却期间，速率可能改变。在尖晶石结晶之前，在淬火过程中明显形成了难熔金属熔核。
Tiny refractory metal nuggets are mainly observed inside Ca, Al‐rich inclusions (CAIs) from chondritic meteorites and are commonly assumed to be condensates from a solar composition gas. However, recent detailed studies of metal nugget compositions and their comparison with predictions from condensation show that the observed abundance patterns are extremely difficult to achieve in this way. As a test for the proposed alternative, precipitation from a silicate liquid, we conducted melting experiments, in which nine different refractory metals (nugget components) were equilibrated with each other along with a CAI‐like liquid at reducing conditions. When quenched, minerals similar to those in CAIs formed from such liquids including refractory metal nuggets exhibiting compositions and appearances similar to those of the meteoritic nuggets. The run products and their comparison with a meteoritic nugget‐bearing CAI is evidence for formation of refractory metal nuggets during cooling of Ca, Al‐rich liquids at rates about 1000°/40 s (in the interval from 1900 to 900 °C). To achieve the formation of refractory metal nuggets and the textures observed in the host inclusions, during cooling the rate probably changed. Refractory metal nuggets apparently formed during quenching before spinel crystallized.
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DOI：
10.1016/b0-08-043751-6/01067-7
发表时间：
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期刊：
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影响因子：
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作者：
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