Skip to Main content Skip to Navigation
Journal articles

Auriferous Quartz Veining Due to CO2 Content Variations and Decompressional Cooling, Revealed by Quartz Solubility, SEM-CL and Fluid Inclusion Analyses (The Linglong Goldfield, Jiaodong)

Abstract : Quartz is the most common gangue mineral in hydrothermal veins. Coupled with capacities of hosting fluid inclusions and recording varieties of microtextures, its solubility behavior may provide unparalleled insights into hydrothermal processes. In this study, the Linglong goldfield in Jiaodong is targeted to investigate gold-producing quartz veining process. Scanning electron microscope (SEM)-cathodoluminescence (CL) imaging uncovered three episodes of quartz deposition, intervened by an episode of quartz dissolution. Based on newly-developed quartz solubility diagrams and CL-aided fluid inclusion microthermometry, it is proposed that precipitation of the earliest quartz (Qz1) was controlled by CO 2 content increase and subordinately affected by decompressional cooling, leading to the formation of the early thick gold-barren veins (V1); the second generation of quartz (Qz2a) was formed by the same fluids that may have been diluted and cooled by meteoric water, leading to a greatly reduced quantity of quartz and the deposition of pyrite and gold; and the third generation of quartz (Qz2b) was deposited along with polymetallic sulfides, due to fluid cooling following a quartz dissolution event likely induced by cooling in retrograde solubility region and/or CO 2 content decrease. This research may elucidate gold formation processes in orogenic intrusion-related deposits, and points to imperative CL-based in situ analyses for future studies.
Complete list of metadatas

Cited literature [81 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/hal-03004026
Contributor : Jacques Pironon <>
Submitted on : Friday, November 13, 2020 - 3:13:51 PM
Last modification on : Monday, November 16, 2020 - 12:25:26 PM

File

Wei-2020-Minerals.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Qing Wei, Hongrui Fan, Jacques Pironon, Xuan Liu. Auriferous Quartz Veining Due to CO2 Content Variations and Decompressional Cooling, Revealed by Quartz Solubility, SEM-CL and Fluid Inclusion Analyses (The Linglong Goldfield, Jiaodong). Minerals, MDPI, 2020, 10 (5), pp.417. ⟨10.3390/min10050417⟩. ⟨hal-03004026⟩

Share

Metrics

Record views

15

Files downloads

16