The formation of the Yichun Ta-Nb deposit, South China, through fractional crystallization of magma indicated by fluid and silicate melt inclusions

Formation of miarolitic-class, segregation-type pegmatites in the Taishanmiao batholith, China: The role of pressure fluctuations and volatile exsolution during pegmatite formation in a closed, isochoric system

“…This suggests that F would remain in the melt during exsolution of a magmatic aqueous phase. The silicate melt would be continuously enriched in F as fractional crystallization proceeds, even in the presence of an exsolving aqueous phase, as is observed in many natural systems (Li et al, 2017). In contrast, once volatile saturation is achieved, Cl is strongly partitioned into the aqueous phase, especially in rhyolitic systems, with D Cl varying from 16 to 115 based on experiment results (Webster et al, 2009).…”

Refinement of the α–β quartz phase boundary based on in situ Raman spectroscopy measurements in hydrothermal diamond‐anvil cell and an evaluated equation of state of pure H2O

“…We calibrated the thermocouples by using the melting points of pure NaNO 3 (306.8 C) and NaCl (800.5 C) reagents at ambient pressure, and the accuracy of our temperature measurements is ±1.5 C, which is consistent with that reported by Bassett et al [5] Instead of having two guide posts as in HDAC-V, the new type of HDAC (HDAC-VT) has three, such that it greatly improves the quality of alignment of the two diamonds against the Re gasket to minimize the force needed to seal the fluid sample and facilitate experiments at elevated pressures. More information about the construction of HDAC-VT and experimental procedures can be found in Li et al [14] and Li et al [15] 2.2 | Experimental procedures Raman spectra were collected during a heating cycle after the quartz sample was held at a set temperature for more than 3 min. We used a JY/Horiba LabRAM HR Evolution Raman system, with 532.06-nm (frequency doubled Nd: YAG) laser excitation, an SLWD 50Â Olympus objective having 0.35 numerical aperture, a 1800 grooves/mm grating with a spectral resolution of about 0.2 cm À1 , and $14 mW laser light was focused on the sample during the measurement.…”

A review of niobium and tantalum metallogenic regularity in China

“…(ⅰ) 花岗岩型钽铌矿床. 过铝质花岗岩赋存大量 的原生(如宜春414矿床 [9] )或共(伴生)钽资源(如巴西的 Pitinga矿床和俄罗斯的Orlovka矿床 [10,11] (图S1); 岩体上部也可能产出伟晶岩型钽矿 化和石英脉型钨锡矿化 [13] . 该类矿床的稀有金属矿物…”

“…[12,14] . 近年来, 岩石矿 物学和熔体包裹体研究表明国内该类型矿床多为岩浆 结晶分异成因 [9,15] . 矿物学研究表明, 该类矿床除了岩 浆结晶作用外, 还存在热液阶段铌钽成矿的现象 [16~23] .…”