Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China

Li, Zhaoli; Hu, Ruizhong; Peng, Jiantang; Bi, Xian‐Wu; Li, Xiaomin

doi:10.1111/j.1751-3928.2006.tb00263.x

Cited by 21 publications

(11 citation statements)

References 28 publications

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“…As shown before, the REE and C‐O isotopic geochemistry of calcites from the Furong deposit provides information on the magmatic hydrothermal origin for the tin mineralization, probably involving surface‐derived meteoric water. This also agrees with the results from sulfur, lead and helium isotopic geochemistry (Li et al. , 2006; Li et al.…”

Section: Discussionsupporting

confidence: 92%

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REE, Mn, Fe, Mg and C, O Isotopic Geochemistry of Calcites from Furong Tin Deposit, South China: Evidence for the Genesis of the Hydrothermal Ore‐forming Fluids

Yan¹,

Bi²,

Hu³

et al. 2010

Resource Geology

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The Furong tin deposit in the central Nanling region, South China, consists of three main types of mineralization ores, i.e. skarn-, altered granite-and greisen-type ores, hosted in Carboniferous and Permian strata and Mesozoic granitic intrusions. Calcite is the dominant gangue mineral intergrown with ore bodies in the orefield. We have carried out REE, Mn, Fe, and Mg geochemical and C, and O isotopic studies on calcites to constrain the source and evolution of the ore-forming fluids. The calcites from the Furong deposit exhibit middle negative Eu anomaly (Eu/Eu* = 0.311-0.921), except for one which has an Eu/Eu* of 1.10, with the total REE content of 5.49-133 ppm. The results show that the calcites are characterized by two types of REE distribution patterns: a LREE-enriched pattern and a flat REE pattern. The LREE-enriched pattern of calcites accompanying greisen-type ore and skarn-type ore are similar to those of Qitianling granite. The REE, Mn, Fe, and Mg abundances of calcites exhibit a decreasing tendency from granite rock mass to wall rock, i.e. these abundances of calcites associated with altered granite-type and greisen-type ores are higher than those associated with skarn-type ores. The calcites from primary ores in the Furong deposit show large variation in carbon and oxygen isotopic compositions. The d From the intrusion to wall-rock, the calcites display an increasing tendency with respect to d 13 C values. This implies that the carbon isotopic compositions of the ore-bearing fluids have progressively changed from domination by magmatic carbon to sedimentary carbonate carbon. In combination with other geological and geochemical data, we suggest that the ore-forming fluids represent magmatic origin. We believe that the fluids exsolved from fractionation of the granitic magma, accompanying magmatism of the Qitianling granite complex, were involved in the mineralization of the Furong tin polymetallic deposit.

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Section: Discussionsupporting

confidence: 92%

“…Regional NE-trending fault structures are well developed in the central Nanling district. Along these faults there intruded a great deal of granitoids, and numerous granite-related tin and tungsten deposits occur, including Shizhuyuan , Yaogangxian , Xianghualing , and Furong (Li et al, 2006) (Fig. 1).…”

Section: Regional and Local Geologymentioning

confidence: 99%

REE, Mn, Fe, Mg and C, O Isotopic Geochemistry of Calcites from Furong Tin Deposit, South China: Evidence for the Genesis of the Hydrothermal Ore‐forming Fluids

Yan¹,

Bi²,

Hu³

et al. 2010

Resource Geology

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“…The high initial melt H 2 O contents may relate to dehydration partial melting of hydrous source minerals such as Amp and Bt, which may yield initial H 2 O melt of up to ~9 wt % with melt compositions broadly similar to Qitianling mafic magmas (e.g., Beard & Lofgren, ). In addition, fluids derived from mantle‐derived magmas underplated in the lower crust, which are inferred to have provided most of the heat for generating the crustal melts and Jurassic granites in South China (e.g., Li et al, , ; Zhao et al, ), could have played a role as well, though such fluids would have been CO 2 ‐rich, while we infer low CO 2 contents for the main granite magmas with X H 2 O > 0.7 during most of its crystallization (compare Figures and ). Based on the composition of the natural Bt crystals, melt fluorine contents appear to have been ~0.2 wt % and thus moderately high during Bt crystallization (using a ( D F Bt/melt ) partition coefficient of 3.7 according to Icenhower and London (), but significantly below saturation (at several wt %; Bailey, ; Huang et al, ) until late‐stage crystallization.…”

Section: Discussionmentioning

confidence: 61%

Experimental Constraints on Intensive Crystallization Parameters and Fractionation in A‐Type Granites: A Case Study on the Qitianling Pluton, South China

et al. 2019

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Phase equilibrium experiments are essential for robustly and accurately constraining the intensive parameters of magma systems and their fractionation history, which is particularly true for A-type granites crystallized from H 2 O-rich melts and at reducing conditions. Here, we constrain the crystallization conditions of the ferroan (A-type), Sn-mineralized Qitianling granite of South China, which formed during a major event of crustal formation and reorganization in the Mesozoic. To characterize the magma system conditions and fractionation, we have carried out a series of experiments on three representative, amphibole-bearing samples. The experiments were performed at 100-700 MPa (mainly at 200 and 300 MPa), at an fO 2 of~NNO−1.3 (1.3 log unit below the Ni-NiO buffer) or~NNO+2.4, at 660 to 900°C , and at variable H 2 O melt (~3-9 wt %). They show that the Qitianling magmas last crystallized at ≥300-350 MPa, at a H 2 O melt ≥ 6.5-8.0 wt %, and that magmatic fO 2 was~NNO−1.3 ± 0.5 at above-solidus conditions. Amphibole texture in the rocks suggests an early crystallization of this mineral, hence that water-rich (≥4 wt % H 2 O in melt) conditions prevailed early during the magmatic evolution, prior to amphibole crystallization. At all investigated conditions, amphibole crystallization requires at least 5-6 wt % dissolved H 2 O, being even absent in the more potassic composition. We interpret this as resulting from the elevated K 2 O content of the investigated compositions that inhibits amphibole crystallization in metaluminous granitic systems. The experimental liquid line of descent obtained at 200-300 MPa mimics the geochemical trend expressed by the pluton suggesting that fractionation occurred in the upper crustal reservoir. Key Points: • A-type Qitianling magmas were produced at high temperature (>900°C ) and with initial H 2 O melt ≥ 4 wt % • Crystallization of Qitianling granites occurred at ≥300-350 MPa, NNO −1.3 ± 0.5, and near-solidus H 2 O melt ≥ 6.5-8.0 wt % • Fractionation of the magmas occurred at or close to the level of final emplacement and crystallization Supporting Information: • Supporting Information S1granite evolution, we have carried out phase equilibrium experiments to robustly constrain the intensive parameters of crystallization for the A-type granites. We present (1) a petrological and geochemical overview on the Qitianling pluton; and (2) results from our phase equilibrium experiments; followed by a discussion of (3) the intensive crystallization parameters; and (4) processes underlying the geochemical variation of the pluton. We highlight that phase equilibrium constraints are crucial for deriving reliable estimates for crystallization temperatures, melt H 2 O content, and fO 2 for ferroan A-type granites, and thus for unraveling Mesozoic crust formation and evolution in South China.

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“…Over the last century, many studies have focused on these ore fields, including petrological and mineralogical research on the geological settings of metallogenesis, geological features of the deposits, sources of ore-forming materials, and the signatures of ore-forming fluids. In particular, some large ore deposits, such as the Dexing porphyry Cu deposit in Jiangxi Province, the Shuikoushan Pb-Zn polymetallic deposits in Hunan Province, the Shizhuyuan-Xianghualing-Furong W-Sn polymetallic deposits in South Hunan Province, etc., have been studied by many researchers (Hua et al 2003;Li et al 2006Li et al , 2007dWang et al 2006;Li and Sasaki 2007;Mao et al 2007Mao et al , 2009Zhang et al 2007b). Three metallogenic belts are recognized from NE to SW (Figure 2A (1) The Cu-(Au) metallogenic belt is mainly located in the NE corner of the South China Block.…”

Section: Mesozoic Igneous Rocks In Se Chinamentioning

confidence: 99%

Mesozoic large magmatic events and mineralization in SE China: oblique subduction of the Pacific plate

Wang

Ling

Ding

et al. 2010

International Geology Review

189

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Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China

Cited by 21 publications

References 28 publications

REE, Mn, Fe, Mg and C, O Isotopic Geochemistry of Calcites from Furong Tin Deposit, South China: Evidence for the Genesis of the Hydrothermal Ore‐forming Fluids

REE, Mn, Fe, Mg and C, O Isotopic Geochemistry of Calcites from Furong Tin Deposit, South China: Evidence for the Genesis of the Hydrothermal Ore‐forming Fluids

Experimental Constraints on Intensive Crystallization Parameters and Fractionation in A‐Type Granites: A Case Study on the Qitianling Pluton, South China

Mesozoic large magmatic events and mineralization in SE China: oblique subduction of the Pacific plate

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