Fluid-melt and fluid inclusions in mianning REE deposit, Sichuan, Southwest China

1997 ◽  
Vol 16 (3) ◽  
pp. 256-262 ◽  
Author(s):  
Hecai Niu ◽  
Qiang Shan ◽  
Maoqing Lin
Keyword(s):  
Fluid Inclusions ◽  
Southwest China ◽  
Melt And Fluid Inclusions

Diffusive reequilibration of quartz-hosted silicate melt and fluid inclusions: Are all metal concentrations unmodified?

2009 ◽  
Vol 73 (10) ◽  
pp. 3013-3027 ◽  
Author(s):  
Zoltan Zajacz ◽  
Jacob J. Hanley ◽  
Christoph A. Heinrich ◽  
Werner E. Halter ◽  
Marcel Guillong
Keyword(s):  
Fluid Inclusions ◽  
Silicate Melt ◽  
Metal Concentrations ◽  
Melt And Fluid Inclusions

The origin of magnetite-apatite rocks of Mushgai-Khudag Complex, South Mongolia: mineral chemistry and studies of melt and fluid inclusions

Lithos ◽  
2018 ◽  
Vol 320-321 ◽  
pp. 567-582 ◽  
Author(s):  
Anna M. Nikolenko ◽  
Anna A. Redina ◽  
Anna G. Doroshkevich ◽  
Ilya R. Prokopyev ◽  
Alexey L. Ragozin ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Mineral Chemistry ◽  
Melt And Fluid Inclusions

Melt and fluid inclusions in dunite xenoliths from La Gomera, Canary Islands: tracking the mantle metasomatic fluids

1994 ◽  
Vol 6 (6) ◽  
pp. 805-818 ◽  
Author(s):  
Maria-Luce Frezzotti ◽  
Jacques L.R. Touret ◽  
Wim J. Lustenhouwer ◽  
Else-Ragnild Neumann
Keyword(s):  
Canary Islands ◽  
Fluid Inclusions ◽  
Melt And Fluid Inclusions ◽  
La Gomera

Tin and associated metal and metalloid geochemistry by femtosecond LA-ICP-QMS microanalysis of pegmatite–leucogranite melt and fluid inclusions: new evidence for melt–melt–fluid immiscibility

2012 ◽  
Vol 76 (1) ◽  
pp. 91-113 ◽  
Author(s):  
A. Y. Borisova ◽  
R. Thomas ◽  
S. Salvi ◽  
F. Candaudap ◽  
A. Lanzanova ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Inductively Coupled Plasma ◽  
Melt Inclusions ◽  
Saturation Index ◽  
Femtosecond Laser Ablation ◽  
Type A ◽  
Inductively Coupled ◽  
Melt And Fluid Inclusions ◽  
Layer Effect ◽  
Primary Melt

AbstractGranitic pegmatites are exceptional igneous rocks and the possible role of an immiscibility process in their origin is strongly debated. To investigate metal and metalloid behaviour in hydrous peraluminous systems (aluminium saturation index, ASI >1), we analysed 15 quartz-hosted primary melt and fluid inclusions from pegmatites in the Ehrenfriedersdorf Complex (Erzgebirge, Germany) and 26 primary melt inclusions from leucogranites of the Ehrenfriedersdorf district (Germany), Kymi (Finland) and Erongo (Namibia) by femtosecond laser ablation inductively coupled plasma quadrupole mass spectrometry. The results presented here for 32 elements provide evidence for metal and metalloid fractionation between two types of immiscible melts (A and B) and NaCl – HCl-rich brine in the pegmatite system. No evidence for the boundary layer effect was observed in the 40 – 500 μm size melt inclusions that were investigated. The data on the Ehrenfriedersdorf pegmatites allow quantification of the metal and metalloid partitioning between natural NaCl-rich brine and the two types of melt (e.g. KAsbrine/type-A,B melts = 0.01 – 1.7; KSbbrine/type-A,B melts = 10 – 285; KZnbrine/type-A,B melts ≥ 50; KPbbrine/type-A melt ≥ 50; KAgbrine/type-A melt = 46). These data are in accord with existing natural and experimental data on equilibrium fluid – melt partitioning as well as spectroscopic data on the metal and metalloid complexation in hydrous aluminosilicate melts and NaCl – HCl-rich fluids.

New Insights into the Origin of the World-Class Jinding Sediment-Hosted Zn-Pb Deposit, Southwestern China: Evidence from LA-ICP-MS Analysis of Individual Fluid Inclusions

2021 ◽  
Author(s):  
Lan Mu ◽  
Ruizhong Hu ◽  
Xianwu Bi ◽  
Yongyong Tang ◽  
Tingguang Lan ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Southwest China ◽  
Critical Role ◽  
Previous Suggestion ◽  
Inductively Coupled ◽  
Icp Ms ◽  
The World ◽  
World Class ◽  
Homogenization Temperatures ◽  
Very High

Abstract The Jinding deposit in the Lanping basin, southwest China, is the largest sandstone-hosted Zn deposit in the world and the second largest Zn-Pb deposit in China. However, questions related to the metal compositions and origin of the ore fluids remain. In this study, microthermometry and laser ablation-inductively coupled plasmamass spectrometry (LA-ICP-MS) were employed to determine the properties and compositions of individual fluid inclusions trapped in sphalerite and calcite. The results show that the fluid inclusions trapped in sphalerite and calcite have similar homogenization temperatures (79°–173°C with the majority 100°–130°C), salinities (10.3–29.1 wt % NaCl + CaCl2 equiv with the majority 24.5–27.4 wt % NaCl + CaCl2 equiv), and concentrations of alkali and alkali earth elements (e.g., Na, Ca, Mg, K, Sr, Ba, Li, Rb, and Cs). However, the concentrations of ore and associated metals (e.g., Pb, Sb, Ag, and Tl) in the fluid inclusions hosted by sphalerite are significantly higher than those hosted by calcite. Based on these observations, we propose that the sulfides including sphalerite were precipitated from a low-temperature, high-salinity, Ca-rich, metal-rich fluid, while the gangue minerals such as calcite crystallized subsequently from fluids depleted in metals due to prior precipitation of sulfides, and that the high salinities of the fluid inclusions are likely due to a combination of seawater evaporation and subsequent dissolution of evaporitic sequences during fluid percolation. The LA-ICP-MS analyses reveal that the fluid inclusions have K/Na, Rb/Na, and Cs/Na ratios within the range of modern basinal brines, and Li/Na, Ba/Na, and Ca/Na ratios share similar compositions with the ore fluids of basement interacted deposits in the world. The Jinding ore fluids contain ~200 to 650 ppm Pb, based on the data of fluid inclusions trapped in sphalerite. The estimated concentrations of Zn in the ore fluids are also very high at ~200 to 6,500 ppm. Our results reveal that anomalously metal rich fluids played a critical role in the formation of the giant Jinding sediment-hosted Pb-Zn deposit. We concur with the previous suggestion that sulfide precipitation at Jinding occurred when ascending metal-rich brines encountered an H2S-rich, Ca-rich fluid, which was produced by interaction of hydrocarbons with evaporites, in the cap of the Jinding dome.

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