New evidence from the Wuliji'Oboo fluorite deposit for the role of the paleo-Pacific Plate and Mongol–Okhotsk suture in creating extensive fluorite mineralization in the Great Xing'an Range, NE China

Hao Zou, Franco Pirajno, Qiang Zhang, Svetlana Tessalina, Bryant Ware, Xinyu Li, Hang Liu, Yang Li, Xiu wei Jiang, Shao yi Wei

Research output: Contribution to journalArticle

Abstract

The Wuliji'Oboo fluorite deposit is a newly discovered deposit hosted by volcanic rocks of the Early Cretaceous Baiyin'gaolao Formation, which are located in the Great Xing'an Range. Fluorite orebodies within this area are controlled by the NNE-trending faults. The ΣREE of fluorite samples ranges from 19.18 to 361.22 ppm, with an average of 131.14 ppm. The homogenization temperatures are concentrated in the ranges of 100–150°C and 230–350°C, while the salinity is concentrated in 0.3–1.0 and 2.0–4.5 wt.% NaCl eqv., and the density has ranges of 0.92–0.96 and 0.75–0.8 g/cm3, respectively. The δDV-SMOW values of fluid inclusions within the fluorite range between −122.3‰ and −105.6‰ with a mean of −115.36‰. The δ18OV-SMOW of fluorite ranges from −12.0 to −8.5‰, average is −9.9‰. Sm–Nd isotopic data on the fluorite ore yield an isochron age of 122 ± 15 Ma and have ɛNd(t) values ranging from +3.15 to +4.16 and (87Sr/86Sr)i values ranging from 0.704907 to 0.705765. In this contribution, field, petrologic, and geochemical data lead us to the following salient findings: (a) The ore consists of fluorite, quartz, and calcite, with host rock alteration that includes silicification, calcitization, and sericitization. The major element data reveal that the host rocks are a series of highK calc-alkaline rhyolite. The REEs suggest that F-rich fluids in this region might have experienced a long-distance migration. The Tb/Ca-Tb/La diagram confirms a hydrothermal origin for the deposit. (b) Petrographic evidence and fluid inclusions in the fluorites indicate that this deposit might have two ore-forming stages. The ore-forming fluids can be attributed to a NaCl-H2O-F system with moderate-low temperature, low salinity, and low density and have a meteoric water source, with water/rock reaction as the main mechanism for fluorite precipitation. (c) The deposit was formed in an anorogenic within-plate extensional tectonic setting related to the lithospheric thinning occurring after the Mongolian–Okhotsk Ocean closure.

Original languageEnglish
JournalGeological Journal
DOIs
Publication statusE-pub ahead of print - 19 Aug 2019

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Pacific plate
fluorite
mineralization
fluid inclusion
host rock
rare earth element
salinity
ore-forming fluid
silicification
extensional tectonics
rhyolite
meteoric water
plate tectonics
tectonic setting
thinning
volcanic rock
calcite
diagram
quartz
Cretaceous

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@article{799ab295e7c34f059124b23e01c2b012,
title = "New evidence from the Wuliji'Oboo fluorite deposit for the role of the paleo-Pacific Plate and Mongol–Okhotsk suture in creating extensive fluorite mineralization in the Great Xing'an Range, NE China",
abstract = "The Wuliji'Oboo fluorite deposit is a newly discovered deposit hosted by volcanic rocks of the Early Cretaceous Baiyin'gaolao Formation, which are located in the Great Xing'an Range. Fluorite orebodies within this area are controlled by the NNE-trending faults. The ΣREE of fluorite samples ranges from 19.18 to 361.22 ppm, with an average of 131.14 ppm. The homogenization temperatures are concentrated in the ranges of 100–150°C and 230–350°C, while the salinity is concentrated in 0.3–1.0 and 2.0–4.5 wt.{\%} NaCl eqv., and the density has ranges of 0.92–0.96 and 0.75–0.8 g/cm3, respectively. The δDV-SMOW values of fluid inclusions within the fluorite range between −122.3‰ and −105.6‰ with a mean of −115.36‰. The δ18OV-SMOW of fluorite ranges from −12.0 to −8.5‰, average is −9.9‰. Sm–Nd isotopic data on the fluorite ore yield an isochron age of 122 ± 15 Ma and have ɛNd(t) values ranging from +3.15 to +4.16 and (87Sr/86Sr)i values ranging from 0.704907 to 0.705765. In this contribution, field, petrologic, and geochemical data lead us to the following salient findings: (a) The ore consists of fluorite, quartz, and calcite, with host rock alteration that includes silicification, calcitization, and sericitization. The major element data reveal that the host rocks are a series of highK calc-alkaline rhyolite. The REEs suggest that F-rich fluids in this region might have experienced a long-distance migration. The Tb/Ca-Tb/La diagram confirms a hydrothermal origin for the deposit. (b) Petrographic evidence and fluid inclusions in the fluorites indicate that this deposit might have two ore-forming stages. The ore-forming fluids can be attributed to a NaCl-H2O-F system with moderate-low temperature, low salinity, and low density and have a meteoric water source, with water/rock reaction as the main mechanism for fluorite precipitation. (c) The deposit was formed in an anorogenic within-plate extensional tectonic setting related to the lithospheric thinning occurring after the Mongolian–Okhotsk Ocean closure.",
keywords = "fluid inclusion, fluorite mineralization, geochemistry, Great Xing'an Range, H-O isotopes, Sm–Nd dating",
author = "Hao Zou and Franco Pirajno and Qiang Zhang and Svetlana Tessalina and Bryant Ware and Xinyu Li and Hang Liu and Yang Li and Jiang, {Xiu wei} and Wei, {Shao yi}",
year = "2019",
month = "8",
day = "19",
doi = "10.1002/gj.3601",
language = "English",
journal = "Geological Journal",
issn = "0072-1050",
publisher = "John Wiley & Sons",

}

New evidence from the Wuliji'Oboo fluorite deposit for the role of the paleo-Pacific Plate and Mongol–Okhotsk suture in creating extensive fluorite mineralization in the Great Xing'an Range, NE China. / Zou, Hao; Pirajno, Franco; Zhang, Qiang; Tessalina, Svetlana; Ware, Bryant; Li, Xinyu; Liu, Hang; Li, Yang; Jiang, Xiu wei; Wei, Shao yi.

In: Geological Journal, 19.08.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - New evidence from the Wuliji'Oboo fluorite deposit for the role of the paleo-Pacific Plate and Mongol–Okhotsk suture in creating extensive fluorite mineralization in the Great Xing'an Range, NE China

AU - Zou, Hao

AU - Pirajno, Franco

AU - Zhang, Qiang

AU - Tessalina, Svetlana

AU - Ware, Bryant

AU - Li, Xinyu

AU - Liu, Hang

AU - Li, Yang

AU - Jiang, Xiu wei

AU - Wei, Shao yi

PY - 2019/8/19

Y1 - 2019/8/19

N2 - The Wuliji'Oboo fluorite deposit is a newly discovered deposit hosted by volcanic rocks of the Early Cretaceous Baiyin'gaolao Formation, which are located in the Great Xing'an Range. Fluorite orebodies within this area are controlled by the NNE-trending faults. The ΣREE of fluorite samples ranges from 19.18 to 361.22 ppm, with an average of 131.14 ppm. The homogenization temperatures are concentrated in the ranges of 100–150°C and 230–350°C, while the salinity is concentrated in 0.3–1.0 and 2.0–4.5 wt.% NaCl eqv., and the density has ranges of 0.92–0.96 and 0.75–0.8 g/cm3, respectively. The δDV-SMOW values of fluid inclusions within the fluorite range between −122.3‰ and −105.6‰ with a mean of −115.36‰. The δ18OV-SMOW of fluorite ranges from −12.0 to −8.5‰, average is −9.9‰. Sm–Nd isotopic data on the fluorite ore yield an isochron age of 122 ± 15 Ma and have ɛNd(t) values ranging from +3.15 to +4.16 and (87Sr/86Sr)i values ranging from 0.704907 to 0.705765. In this contribution, field, petrologic, and geochemical data lead us to the following salient findings: (a) The ore consists of fluorite, quartz, and calcite, with host rock alteration that includes silicification, calcitization, and sericitization. The major element data reveal that the host rocks are a series of highK calc-alkaline rhyolite. The REEs suggest that F-rich fluids in this region might have experienced a long-distance migration. The Tb/Ca-Tb/La diagram confirms a hydrothermal origin for the deposit. (b) Petrographic evidence and fluid inclusions in the fluorites indicate that this deposit might have two ore-forming stages. The ore-forming fluids can be attributed to a NaCl-H2O-F system with moderate-low temperature, low salinity, and low density and have a meteoric water source, with water/rock reaction as the main mechanism for fluorite precipitation. (c) The deposit was formed in an anorogenic within-plate extensional tectonic setting related to the lithospheric thinning occurring after the Mongolian–Okhotsk Ocean closure.

AB - The Wuliji'Oboo fluorite deposit is a newly discovered deposit hosted by volcanic rocks of the Early Cretaceous Baiyin'gaolao Formation, which are located in the Great Xing'an Range. Fluorite orebodies within this area are controlled by the NNE-trending faults. The ΣREE of fluorite samples ranges from 19.18 to 361.22 ppm, with an average of 131.14 ppm. The homogenization temperatures are concentrated in the ranges of 100–150°C and 230–350°C, while the salinity is concentrated in 0.3–1.0 and 2.0–4.5 wt.% NaCl eqv., and the density has ranges of 0.92–0.96 and 0.75–0.8 g/cm3, respectively. The δDV-SMOW values of fluid inclusions within the fluorite range between −122.3‰ and −105.6‰ with a mean of −115.36‰. The δ18OV-SMOW of fluorite ranges from −12.0 to −8.5‰, average is −9.9‰. Sm–Nd isotopic data on the fluorite ore yield an isochron age of 122 ± 15 Ma and have ɛNd(t) values ranging from +3.15 to +4.16 and (87Sr/86Sr)i values ranging from 0.704907 to 0.705765. In this contribution, field, petrologic, and geochemical data lead us to the following salient findings: (a) The ore consists of fluorite, quartz, and calcite, with host rock alteration that includes silicification, calcitization, and sericitization. The major element data reveal that the host rocks are a series of highK calc-alkaline rhyolite. The REEs suggest that F-rich fluids in this region might have experienced a long-distance migration. The Tb/Ca-Tb/La diagram confirms a hydrothermal origin for the deposit. (b) Petrographic evidence and fluid inclusions in the fluorites indicate that this deposit might have two ore-forming stages. The ore-forming fluids can be attributed to a NaCl-H2O-F system with moderate-low temperature, low salinity, and low density and have a meteoric water source, with water/rock reaction as the main mechanism for fluorite precipitation. (c) The deposit was formed in an anorogenic within-plate extensional tectonic setting related to the lithospheric thinning occurring after the Mongolian–Okhotsk Ocean closure.

KW - fluid inclusion

KW - fluorite mineralization

KW - geochemistry

KW - Great Xing'an Range

KW - H-O isotopes

KW - Sm–Nd dating

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U2 - 10.1002/gj.3601

DO - 10.1002/gj.3601

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JO - Geological Journal

JF - Geological Journal

SN - 0072-1050

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