Electron Microprobe Analysis of Biotite with Reequilibration Texture in Altered Trachyte

Xiao NIE; Zong-qi WANG; Lei CHEN; Pu-pu CHEN; Gang WANG

doi:10.15898/j.cnki.11-2131/td.201807100081

2019 Vol. 38, No. 5

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Article navigation > Rock and Mineral Analysis > 2019 > 38(5): 565-574

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Xiao NIE, Zong-qi WANG, Lei CHEN, Pu-pu CHEN, Gang WANG. Electron Microprobe Analysis of Biotite with Reequilibration Texture in Altered Trachyte[J]. Rock and Mineral Analysis, 2019, 38(5): 565-574. doi: 10.15898/j.cnki.11-2131/td.201807100081

Citation:

Xiao NIE, Zong-qi WANG, Lei CHEN, Pu-pu CHEN, Gang WANG. Electron Microprobe Analysis of Biotite with Reequilibration Texture in Altered Trachyte[J]. Rock and Mineral Analysis, 2019, 38(5): 565-574. doi: 10.15898/j.cnki.11-2131/td.201807100081

Electron Microprobe Analysis of Biotite with Reequilibration Texture in Altered Trachyte

1.
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Shanxi Dikuang Overseas Engineering Construction Co. LTD, Taiyuan 030002, China

More Information

Corresponding author: Lei CHEN, chenleihx@gmail.com

Received Date: 10 July 2018

Revised Date: 05 March 2019

Accepted Date: 16 July 2019

Abstract

Abstract

BACKGROUNDThe chemical composition of biotite contains important genetic information. The in-situ analyses of biotite with metasomatic texture can reflect the migration of the elements during the metasomatic alteration, and provide mineralogical evidence for the ore-forming mechanism. OBJECTIVESTo investigate the migration of elements during trachyte alteration and reveal the Nb mineralization mechanism in altered trachyte. METHODSBiotite phenocryst with reequilibration texture in altered trachyte in the Pingli area of North Dabashan was studied, and the EMPA element mapping and line profile analyses were carried out. RESULTSThe results show that the phenocryst was magmatic in the core and the reequilibrated origin on the rim, caused by diffusion-reaction process. Compared with the core, the TiO₂ content decreased from an average of 5.78% to 2.22% in the rim, indicating that Ti was leached out into the fluid during the exchange alteration. The CaO content increased from 0.06% to 0.14% on average, and the F content increased from 0.60% to 0.80% on average, suggesting that the alteration fluid is rich in Ca and F. CONCLUSIONSThe formation of Nb deposits in trachyte is closely related to the hydrothermal activity, and the components such as Ca and F in the ore-forming fluid play an important role in the migration and enrichment of Nb.
- biotite /
- electron microprobe analysis /
- reequilibration textures /
- Nb deposit /
- trachyte

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References

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