scholarly journals In Situ Trace Elemental Analyses of Scheelite from the Chuankou Deposit, South China: Implications for Ore Genesis

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1007
Author(s):  
Junqing Pan ◽  
Tagen Dai ◽  
Dexian Zhang ◽  
Wenshen Li ◽  
Richard C. Bayless ◽  
...  
Keyword(s):  
South China ◽  
Meteoric Water ◽  
Central Area ◽  
Optical Microscope ◽  
Stratigraphic Sequence ◽  
Mass Spectrometers ◽  
Inductively Coupled ◽  
Elemental Analyses ◽  
Trace Elemental

The Chuankou tungsten ore field is situated in the central area of the Xuefeng Uplift Belt in South China. The deposit is characterized by two types of tungsten mineralization: quartz-scheelite veins in both the Neoproterozoic Banxi Group and Devonian Yanglin’ao Formation and quartz-wolframite (scheelite) veins in the Chuankou granite. The host rocks of the Chuankou tungsten Deposit of South China are similar to the stratigraphic sequence of Au-Sb-W deposits in the Xuefeng Uplift Belt. It is thus an appropriate location for the study of scheelite mineralization in the belt, especially the relative contributions of surrounding rocks, magma and hydrothermal fluids. Optical Microscope-Cathodoluminescene (OM-CL) and Laser Ablation Inductively Coupled Mass Spectrometers (LA ICPMS) were used to examine scheelite textures and trace element concentrations in the Chuankou deposits. Scheelite in quartz-scheelite veins was formed over three generations. In situ LA-ICPMS trace elemental analyses of scheelite I show light rare earth element (LREE)-rich REE patterns and negative Eu anomalies, suggesting a relatively close fluid system. Significantly positive Eu anomalies of scheelite II and III indicate variable degrees of addition of meteoric water during scheelite precipitation. Therefore, ore-forming fluids of the Chuankou deposit were dominantly magma-derived, with different contributions of recycled meteoric water in the surrounding strata.

In-situ LA-ICP-MS trace elemental analyses of magnetite: Cu-(Au, Fe) deposits in the Khetri copper belt in Rajasthan Province, NW India

2015 ◽  
Vol 65 ◽  
pp. 929-939 ◽  
Author(s):  
Wei Terry Chen ◽  
Mei-Fu Zhou ◽  
Xiaochun Li ◽  
Jian-Feng Gao ◽  
Kejun Hou
Keyword(s):  
Icp Ms ◽  
Elemental Analyses ◽  
Trace Elemental ◽  
Khetri Copper Belt

In situ simultaneous measurement of Rb–Sr/Sm–Nd or Sm–Nd/Lu–Hf isotopes in natural minerals using laser ablation multi-collector ICP-MS

2015 ◽  
Vol 30 (4) ◽  
pp. 994-1000 ◽  
Author(s):  
Chao Huang ◽  
Yue-Heng Yang ◽  
Jin-Hui Yang ◽  
Lie-Wen Xie
Keyword(s):  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Hf Isotopes ◽  
Mass Spectrometers ◽  
Inductively Coupled ◽  
Natural Minerals ◽  
System P ◽  
Icp Ms ◽  
193 Nm

This study presents a combined methodology of simultaneously measuring Rb–Sr/Sm–Nd or Sm–Nd/Lu–Hf isotopes in natural minerals by a means of two multiple collector inductively coupled plasma mass spectrometers connected to a 193 nm excimer laser ablation system.

In-situ LA-ICP-MS trace elemental analyses of magnetite: The Bayan Obo Fe-REE-Nb deposit, North China

2015 ◽  
Vol 65 ◽  
pp. 884-899 ◽  
Author(s):  
Xiao-Wen Huang ◽  
Mei-Fu Zhou ◽  
Yu-Zhuo Qiu ◽  
Liang Qi
Keyword(s):  
North China ◽  
Icp Ms ◽  
Elemental Analyses ◽  
Trace Elemental ◽  
Bayan Obo

scholarly journals LA-ICP-MS Analysis of Minerals from the Shizhuyuan W-Polymetallic Deposit, South China: Implications for Mineralization of Pb, W, Mo and Bi

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 748
Author(s):  
Jiaxin Yuan ◽  
Qingye Hou ◽  
Zhongfang Yang ◽  
Zhaochu Hu ◽  
Tao Yu
Keyword(s):  
South China ◽  
Inductively Coupled Plasma ◽  
Hydrothermal Process ◽  
Silicate Minerals ◽  
Inductively Coupled ◽  
Polymetallic Deposit ◽  
Nanling Range ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

The South China Block (SCB) is a globally important metallogenic district containing numerous W-Sn deposits. Extensive studies of W-polymetallic deposits in this region have greatly improved our understanding of the petrogenesis, geochronology and metallogenesis of these systems. However, studies on the mobilization of ore-forming elements between mineralization- and alteration-related minerals using in situ analyses are rare. Using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), we analyzed W, Pb, Mo and Bi concentrations in silicate minerals and scheelite from granites and skarns associated with the Shizhuyuan W-polymetallic deposit in the Nanling Range in the SCB. Data show that muscovitized biotite in granites contains high W contents. Pb mainly occurs in K-feldspar and plagioclase in granites and epidote and scheelite in skarns. Bi mainly occurs in epidote in skarns. Scheelite in skarns contains high W and Mo contents. Pb isomorphously substitutes K or Ca in silicate minerals and scheelite. W isomorphously substitutes Ti in biotite. Mo isomorphously substitutes W in scheelite and occurs as W-bearing submicroscopic inclusions in minerals with low contents. Bi isomorphously substitutes Pb when the Pb content is relatively high and occurs as Bi-bearing micro or submicroscopic inclusions in minerals when the Pb content is low. Biotite and feldspar are altered in a magmatic-hydrothermal process, W enriched in biotite, Pb enriched in feldspar and the W-, Pb-, Mo- and Bi-bearing submicroscopic inclusions are excluded from minerals and released to the magmatic-hydrothermal fluids. Large amounts of W are precipitated in scheelite when the fluids come in contact with carbonate rocks to form skarn, while a few contents of Pb, Mo and Bi are distributed in skarn minerals. Thus, large amounts of Pb, Mo, Bi and residual W remain in the fluids, which results in the formation of a W-Sn-Mo-Bi massive skarn ore.

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