The Laqiong Sb-Au deposit: Implications for polymetallic mineral systems in the Tethys-Himalayan zone of southern Tibet, China

Hua Wen Cao, Hao Zou, Leon Bagas, Lin Kui Zhang, Zhi Zhang, Zhong Quan Li

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The Himalayan mineral field includes over 50 quartz-vein type Sb-Au deposits, and placer Au deposits. The poorly documented Laqiong deposit is a typical example of quartz-vein type Sb-Au mineralisation in Tethys Himalayan sequence. The orebody are controlled by shallow north-dipping normal faults and north–south trending faults. Magmatic zircons extracted from muscovitic leucocratic granite from the southern part of the Laqiong mine area yield a Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry U-Pb age of 14 ± 1 Ma (n = 12, MSWD = 0.9) that is similar to the 40 Ar/ 39 Ar age of ca. 14 Ma from hydrothermal sericite in auriferous sulphide-quartz veins. The ε Hf (t) values for the magmatic zircon rims range from −5.4 to −1.9, corresponding to two-stage Hf model ages of 1403–1214 Ma. Quartz from the mineralised veins has δ 18 O H2O-SMOW values varying from +4.97 to +9.59‰ and δD H2O-SMOW values ranging from −119.7 to −108.1‰. The δ 13 C V-PDB values for calcite from the ore Stage III range from −6.9 to −5.3‰, and calcite from Stage IV are −3.5 to −1.7‰. The δ 18 O V-SMOW values for calcite from Stage III are +20.3 to +20.6‰ and for Stage IV are −6.3 to −4.9‰. The stibnite and pyrite samples have 208 Pb/ 204 Pb ratios of 38.158 to 39.02, 207 Pb/ 204 Pb ratios of 15.554 to 15.698, and 206 Pb/ 204 Pb ratios of 17.819 to 18.681, and bulk and in-situ δ 34 S V-CDT values for stibnite, arsenopyrite and pyrite range from −1.1 to +2.3‰. The calcite from the orebodies are enriched in MREE and depleted in LREE and HREE. Fieldwork, petrological, and geochemical data collected during our study leads to the following salient findings: the mineralising fluid is a mix of magmatic and meteoric fluids; and the deposit is closely related to the emplacement of Miocene granites originating from a thickened continental crust.

Original languageEnglish
Pages (from-to)83-96
Number of pages14
JournalGondwana Research
Volume72
DOIs
Publication statusPublished - 1 Aug 2019

Fingerprint

Tethys
calcite
quartz vein
stibnite
mineral
pyrite
zircon
placer deposit
fluid
arsenopyrite
ablation
normal fault
fieldwork
continental crust
emplacement
granite
mass spectrometry
laser
Miocene
sulfide

Cite this

Cao, Hua Wen ; Zou, Hao ; Bagas, Leon ; Zhang, Lin Kui ; Zhang, Zhi ; Li, Zhong Quan. / The Laqiong Sb-Au deposit : Implications for polymetallic mineral systems in the Tethys-Himalayan zone of southern Tibet, China. In: Gondwana Research. 2019 ; Vol. 72. pp. 83-96.
@article{6feeb1054ebf4d3197853939d6d16324,
title = "The Laqiong Sb-Au deposit: Implications for polymetallic mineral systems in the Tethys-Himalayan zone of southern Tibet, China",
abstract = "The Himalayan mineral field includes over 50 quartz-vein type Sb-Au deposits, and placer Au deposits. The poorly documented Laqiong deposit is a typical example of quartz-vein type Sb-Au mineralisation in Tethys Himalayan sequence. The orebody are controlled by shallow north-dipping normal faults and north–south trending faults. Magmatic zircons extracted from muscovitic leucocratic granite from the southern part of the Laqiong mine area yield a Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry U-Pb age of 14 ± 1 Ma (n = 12, MSWD = 0.9) that is similar to the 40 Ar/ 39 Ar age of ca. 14 Ma from hydrothermal sericite in auriferous sulphide-quartz veins. The ε Hf (t) values for the magmatic zircon rims range from −5.4 to −1.9, corresponding to two-stage Hf model ages of 1403–1214 Ma. Quartz from the mineralised veins has δ 18 O H2O-SMOW values varying from +4.97 to +9.59‰ and δD H2O-SMOW values ranging from −119.7 to −108.1‰. The δ 13 C V-PDB values for calcite from the ore Stage III range from −6.9 to −5.3‰, and calcite from Stage IV are −3.5 to −1.7‰. The δ 18 O V-SMOW values for calcite from Stage III are +20.3 to +20.6‰ and for Stage IV are −6.3 to −4.9‰. The stibnite and pyrite samples have 208 Pb/ 204 Pb ratios of 38.158 to 39.02, 207 Pb/ 204 Pb ratios of 15.554 to 15.698, and 206 Pb/ 204 Pb ratios of 17.819 to 18.681, and bulk and in-situ δ 34 S V-CDT values for stibnite, arsenopyrite and pyrite range from −1.1 to +2.3‰. The calcite from the orebodies are enriched in MREE and depleted in LREE and HREE. Fieldwork, petrological, and geochemical data collected during our study leads to the following salient findings: the mineralising fluid is a mix of magmatic and meteoric fluids; and the deposit is closely related to the emplacement of Miocene granites originating from a thickened continental crust.",
keywords = "Ar-Ar age, C–H–O–Pb–S isotope, Laqiong Sb-Au deposit, Tethys-Himalayan zone, U-Pb zircon age",
author = "Cao, {Hua Wen} and Hao Zou and Leon Bagas and Zhang, {Lin Kui} and Zhi Zhang and Li, {Zhong Quan}",
year = "2019",
month = "8",
day = "1",
doi = "10.1016/j.gr.2019.02.010",
language = "English",
volume = "72",
pages = "83--96",
journal = "Gondwana Research",
issn = "1342-937X",
publisher = "Elsevier",

}

The Laqiong Sb-Au deposit : Implications for polymetallic mineral systems in the Tethys-Himalayan zone of southern Tibet, China. / Cao, Hua Wen; Zou, Hao; Bagas, Leon; Zhang, Lin Kui; Zhang, Zhi; Li, Zhong Quan.

In: Gondwana Research, Vol. 72, 01.08.2019, p. 83-96.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The Laqiong Sb-Au deposit

T2 - Implications for polymetallic mineral systems in the Tethys-Himalayan zone of southern Tibet, China

AU - Cao, Hua Wen

AU - Zou, Hao

AU - Bagas, Leon

AU - Zhang, Lin Kui

AU - Zhang, Zhi

AU - Li, Zhong Quan

PY - 2019/8/1

Y1 - 2019/8/1

N2 - The Himalayan mineral field includes over 50 quartz-vein type Sb-Au deposits, and placer Au deposits. The poorly documented Laqiong deposit is a typical example of quartz-vein type Sb-Au mineralisation in Tethys Himalayan sequence. The orebody are controlled by shallow north-dipping normal faults and north–south trending faults. Magmatic zircons extracted from muscovitic leucocratic granite from the southern part of the Laqiong mine area yield a Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry U-Pb age of 14 ± 1 Ma (n = 12, MSWD = 0.9) that is similar to the 40 Ar/ 39 Ar age of ca. 14 Ma from hydrothermal sericite in auriferous sulphide-quartz veins. The ε Hf (t) values for the magmatic zircon rims range from −5.4 to −1.9, corresponding to two-stage Hf model ages of 1403–1214 Ma. Quartz from the mineralised veins has δ 18 O H2O-SMOW values varying from +4.97 to +9.59‰ and δD H2O-SMOW values ranging from −119.7 to −108.1‰. The δ 13 C V-PDB values for calcite from the ore Stage III range from −6.9 to −5.3‰, and calcite from Stage IV are −3.5 to −1.7‰. The δ 18 O V-SMOW values for calcite from Stage III are +20.3 to +20.6‰ and for Stage IV are −6.3 to −4.9‰. The stibnite and pyrite samples have 208 Pb/ 204 Pb ratios of 38.158 to 39.02, 207 Pb/ 204 Pb ratios of 15.554 to 15.698, and 206 Pb/ 204 Pb ratios of 17.819 to 18.681, and bulk and in-situ δ 34 S V-CDT values for stibnite, arsenopyrite and pyrite range from −1.1 to +2.3‰. The calcite from the orebodies are enriched in MREE and depleted in LREE and HREE. Fieldwork, petrological, and geochemical data collected during our study leads to the following salient findings: the mineralising fluid is a mix of magmatic and meteoric fluids; and the deposit is closely related to the emplacement of Miocene granites originating from a thickened continental crust.

AB - The Himalayan mineral field includes over 50 quartz-vein type Sb-Au deposits, and placer Au deposits. The poorly documented Laqiong deposit is a typical example of quartz-vein type Sb-Au mineralisation in Tethys Himalayan sequence. The orebody are controlled by shallow north-dipping normal faults and north–south trending faults. Magmatic zircons extracted from muscovitic leucocratic granite from the southern part of the Laqiong mine area yield a Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry U-Pb age of 14 ± 1 Ma (n = 12, MSWD = 0.9) that is similar to the 40 Ar/ 39 Ar age of ca. 14 Ma from hydrothermal sericite in auriferous sulphide-quartz veins. The ε Hf (t) values for the magmatic zircon rims range from −5.4 to −1.9, corresponding to two-stage Hf model ages of 1403–1214 Ma. Quartz from the mineralised veins has δ 18 O H2O-SMOW values varying from +4.97 to +9.59‰ and δD H2O-SMOW values ranging from −119.7 to −108.1‰. The δ 13 C V-PDB values for calcite from the ore Stage III range from −6.9 to −5.3‰, and calcite from Stage IV are −3.5 to −1.7‰. The δ 18 O V-SMOW values for calcite from Stage III are +20.3 to +20.6‰ and for Stage IV are −6.3 to −4.9‰. The stibnite and pyrite samples have 208 Pb/ 204 Pb ratios of 38.158 to 39.02, 207 Pb/ 204 Pb ratios of 15.554 to 15.698, and 206 Pb/ 204 Pb ratios of 17.819 to 18.681, and bulk and in-situ δ 34 S V-CDT values for stibnite, arsenopyrite and pyrite range from −1.1 to +2.3‰. The calcite from the orebodies are enriched in MREE and depleted in LREE and HREE. Fieldwork, petrological, and geochemical data collected during our study leads to the following salient findings: the mineralising fluid is a mix of magmatic and meteoric fluids; and the deposit is closely related to the emplacement of Miocene granites originating from a thickened continental crust.

KW - Ar-Ar age

KW - C–H–O–Pb–S isotope

KW - Laqiong Sb-Au deposit

KW - Tethys-Himalayan zone

KW - U-Pb zircon age

UR - http://www.scopus.com/inward/record.url?scp=85063758576&partnerID=8YFLogxK

U2 - 10.1016/j.gr.2019.02.010

DO - 10.1016/j.gr.2019.02.010

M3 - Article

VL - 72

SP - 83

EP - 96

JO - Gondwana Research

JF - Gondwana Research

SN - 1342-937X

ER -