Mineral inclusions in corundum from chromitites in the Kangjinla chromite deposit, Tibet
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摘要:
西藏康金拉铬铁矿石的矿物学研究中，发现大量的微粒金刚石和碳硅石等超高压异常地幔矿物，表明它们产在一个强还原的高压环境。本研究在铬铁矿石中还发现了刚玉及其中大量的矿物包裹体。电子探针等方法研究表明，包裹体的种类包括简单氧化物，如金红石；自然钛；Ti-N、Ti-Si、Ti-C、Ti-Si-P、Ti-B等合金类；含稀土元素的硅酸盐矿物，以及一些未知矿物。结合对铬铁矿石中其他矿物的研究成果，认为康金拉铬铁矿石中的刚玉及其中的强还原环境形成的矿物组合形成于深部地幔。因此，康金拉铬铁矿石中的刚玉可以认为是一种新的带有高压环境信息的标志性矿物。
Abstract:Large amounts of microdiamond and moissanite have been recovered from the Kangjinla chromitite, Luobusa ophiolite, Tibet, indicating a high reduced and high pressure environment they formed. In this paper many corundum grains and their mineral inclusions have been studied by EPMA and EDS. The inclusions contain simple oxides (such as rutile); nature titanium; alloys such as Ti-N, Ti-Si, Ti-C, Ti-Si-P, Ti-B and so on; REE-bearing silicate minerals, as well as some unknown minerals. Combined the previous study, we conclude that the corundum and their inclusions formed in a high reduced and high pressure environment at deep mantle, and the corundum in the Kangjinla chromitite might be regarded as a new mineral index of a high-pressure environment.
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Key words:
- Inclusion /
- Corundum /
- Chromitite /
- Kangjinla /
- Tibet
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图 1
西藏康金拉豆荚状铬铁矿区地质简图(据鲍佩声等，1999修改)
Figure 1.
Simplified geological map of Kangjinla chromite deposit in Tibet (revised after Bao et al., 1999)
图 2
西藏康金拉铬铁矿石中的刚玉
Figure 2.
Steromicroscope photos of corundum from the podiform chromitite in Kangjinla, Tibet
图 3
西藏康金拉铬铁矿石中的刚玉成分
Figure 3.
Composition diagram of corundum from the podifrom chromitite in Kangjinla, Tibet
图 4
康金拉铬铁矿石中的刚玉及其包裹体
Figure 4.
Corundum and its inclusions from the podiform chromitite in Kangjinla, Tibet
图 5
康金拉铬铁矿石中的刚玉及其包裹体
Figure 5.
Corundum and its inclusions from the podiform chromitite in Kangjinla, Tibet
图 6
康金拉铬铁矿石中的刚玉及其包裹体
Figure 6.
Corundum and its inclusions from the podiform chromitite in Kangjinla, Tibet
图 7
康金拉铬铁矿石中的刚玉及其包裹体
Figure 7.
Corundum and its inclusions from the podiform chromitite in Kangjinla, Tibet
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