Morphology of Barite Synthesized by In-Situ Mixing of Na2SO4 and BaCl2 Solutions at 200 °C

Crystals

Shuai Zhang¹  Chunyao Wang¹  Li Wang¹  Wenge Zhou¹  Chunwan Wei²  Liping Xu³  Li Zhou⁴  Wenlei Song⁵ 

[1] Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;School of Fundamental Science, Zhejiang Pharmaceutical College, No. 666 Siming Road, Ningbo 315500, China;School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550025, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China;

关键词: Barite;    hydrothermal synthesis;    typomorphic characteristics;    in-situ mixing solutions at high temperature;   

DOI  :  10.3390/cryst11080962

来源: DOAJ

【 摘 要 】

Barite is an abundant sulfate mineral in nature. Especially, the variety of morphologies of barite is often driven by the mixing of Ba-bearing hydrothermal fluid and sulfate-bearing seawater around hydrothermal chimneys. In order to better understand the factors affecting the morphology and precipitation mechanism(s) of barite in seafloor hydrothermal systems, we synthesized barite by a new method of in-situ mixing of BaCl₂ and Na₂SO₄ solutions at 200 °C while varying Ba concentrations and ratios of Ba²⁺/SO₄²⁻, and at room temperature for comparison. The results show that barite synthesized by in-situ mixing of BaCl₂ and Na₂SO₄ solutions at 200 °C forms a variety of morphologies, including rod-shaped, granular, plate-shaped, dendritic, X-shaped, and T-shaped morphologies, while room temperature barites display relatively simple, granular, or leaf-like morphologies. Thus, temperature affects barite morphology. Moreover, dendritic barite crystals only occurred at conditions where Ba²⁺ is in excess of SO₄²⁻ at the experimental concentrations. The dendritic morphology of barite may be an important typomorphic feature of barite formed in high-temperature fluids directly mixing with excess Ba²⁺ relative to SO₄²⁻.

【 授权许可】

Unknown