Special Issue "Granite-Related Mineralization Systems "

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Deposits".

Deadline for manuscript submissions: 31 March 2020.

Special Issue Editor

Prof. Dr. Fernando Noronha
E-Mail Website
Guest Editor
Department of Geosciences, Environment and Spatial Planning, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
Interests: ore deposits related to granite magmatism; hydrothermal fluids; tungsten hydrothermal mineralization; Li pegmatites; characterization of geological materials

Special Issue Information

Dear Colleagues,

This Special Issue will focus on recent advances in the metallogeny and mineralogy of the granite-related mineralization system. This specific system is typically associated with orogenic to late-orogenic magmatism, usually of ilmenite type. With regard to the granite-related mineralization system, we can include three major types of ore deposits: disseminated magmatic mineralization in granites themselves, hydrothermal deposits (veins and greisen type), and late-magmatic pegmatites (rare element pegmatites). Distinct types of granite can be generated by the melting of crustal material and/or resulting from the differentiation of basal or infracortical basic magmas.

The role of granites is determinant, not only as a source of metals but also as a source of magmatic fluids. In the case of granites related to orogenic metamorphism, the evidence points to the importance of the composition of the starting materials. In the case of granites, where the basal or infracrustal component is more important, they can act as channels of mineralizing solutions from a deeper origin, or the metallic elements can be derived from the granitic magma itself.

Granites are also important as heat sources capable of generating fluid circuits capable of mobilizing preconcentrations of ores from the host rocks, or to push the non-magmatic fluids (meteoric and metamorphic) involved in the mineralizing processes.

Prof. Dr. Fernando Noronha
Guest Editor

Manuscript Submission Information

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Keywords

  • evaluation of intrusion ore potential
  • metal abundance in source magma
  • granite magma fertility
  • disseminated magmatic mineralization
  • hydrothermal veins
  • greisen
  • rare element pegmatites

Published Papers (2 papers)

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Research

Open AccessArticle
The Role of Magma Mixing in Generating Granodioritic Intrusions Related to Cu–W Mineralization: A Case Study from Qiaomaishan Deposit, Eastern China
Minerals 2020, 10(2), 171; https://doi.org/10.3390/min10020171 - 14 Feb 2020
Abstract
The newly exploited Qiaomaishan Cu−W deposit, located in the Xuancheng ore district in the MLYRB, is a middle-sized Cu–W skarn-type polymetallic deposit. As Cu–W mineralization is a rare and uncommon type in the Middle-Lower Yangtze River Belt (MLYRB), few studies have been carried [...] Read more.
The newly exploited Qiaomaishan Cu−W deposit, located in the Xuancheng ore district in the MLYRB, is a middle-sized Cu–W skarn-type polymetallic deposit. As Cu–W mineralization is a rare and uncommon type in the Middle-Lower Yangtze River Belt (MLYRB), few studies have been carried out, and the geochemical characteristics and petrogenesis of Qiaomaishan intrusive rocks related to Cu–W mineralization are not well documented. We studied two types of ore-bearing intrusive rocks in the Qiaomaishan region, i.e., pure granodiorite porphyry and granodiorite porphyry with mafic microgranular enclaves (MMEs). Age characterization using zircon LA–ICP–MS showed that they were formed almost simultaneously, around 134.9 to 135.1 Ma. Granodiorite porphyries are high Mg# adakites, characterized by high-K calc-alkaline and metaluminous features that are enriched in LILEs (e.g., Sr and Ba) and LREEs, but depleted in HFSEs (e.g., Nb, Ta, and Ti) and HREEs. Moreover, they have enriched Sr–Nd–Hf isotopic compositions (with whole-rock (87Sr/86Sr)i ratios (0.706666−0.706714), negative εNd(t) values of −9.1 to −8.6, negative zircon εHf(t) values of −12.2 to −6.7, and two-stage Hf model ages (TDM2) between 1.5 and 2.0 Ga). However, compared to host rocks, the granodiorite porphyry with MMEs shows variable geochemical compositions, e.g., high Mg#, Cr, Ni, and V contents and enriched with LILEs. In addition, they have more depleted ISr, εNd(t), and εHf(t) values (0.706025 to 0.706269, −6.4 to −7.4, and −10.6 to −5.7, respectively), overlapping with regions of Early Cretaceous mafic rocks derived from enriched lithospheric mantle in the MLYRB. Coupled with significant disequilibrium textures and geochemical features of host rocks and MMEs, we propose that those rocks have resulted from mixing the felsic lower crust-derived magma and the mafic magma generated from the enriched mantle. The mixed magmas subsequently rose to shallow crust to form the ore-bearing rocks and facilitate Cu–W mineralization. Full article
(This article belongs to the Special Issue Granite-Related Mineralization Systems )
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Open AccessArticle
Geochemical Study of Cretaceous Magmatic Rocks and Related Ores of the Hucunnan Cu–Mo Deposit: Implications for Petrogenesis and Poly-Metal Mineralization in the Tongling Ore-Cluster Region
Minerals 2020, 10(2), 107; https://doi.org/10.3390/min10020107 - 26 Jan 2020
Abstract
The Hucunnan porphyry- and skarn-type Cu–Mo deposit is located in the south of the central Shizishan ore field of the Tongling ore-cluster region. The intrusive Hucunnan granodiorite, outcropping in this deposit, has adakitic geochemical features, and its magma is proposed to have originated [...] Read more.
The Hucunnan porphyry- and skarn-type Cu–Mo deposit is located in the south of the central Shizishan ore field of the Tongling ore-cluster region. The intrusive Hucunnan granodiorite, outcropping in this deposit, has adakitic geochemical features, and its magma is proposed to have originated from partial melting of the oceanic crust mixed with mantle-derived materials. The porphyry-type orebody is hosted in the granodiorite, whereas the skarn-type orebody occurs in the contact zones of intrusions and country rocks. The δ34S values of pyrite from the skarn orebodies ranged from +3.9 to +4.7‰ (avg. +4.3‰, n = 6), while those of the porphyry orebodies ranged from +5.1 to +6.2‰ (avg. +5.6‰, n = 4). 208Pb/204Pb, 207Pb/204Pb, and 206Pb/204Pb ratios of the pyrites from the skarn orebodies were 38.04–38.45 (avg. 38.26), 15.55–15.66 (avg. 15.59), and 18.16–18.54 (avg. 18.44), respectively (n = 6). The pyrites in the porphyry orebodies had 208Pb/204Pb, 207Pb/204Pb, and 206Pb/204Pb ratios of 38.24–38.36, 15.51–15.662, and 18.10–18.41, respectively (avg. 38.32, 15.58, 18.22; n = 4), respectively. The metallogenic model ages from Re–Os isotopic dating were 138.7 ± 1.9 and 140.0 ± 2.8 Ma, respectively. Geochemical data indicate that the ore-forming fluids in the skarn stage are characterized by high temperature, low acidity, and high oxygen fugacity, and the ore-forming materials were mainly from magma and partly from stratum, proving that the skarn orebody has more stratum materials than the porphyry orebody. Full article
(This article belongs to the Special Issue Granite-Related Mineralization Systems )
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