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) - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Minerals Année : 2020

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)

Qing Wei
  • Fonction : Auteur
Hongrui Fan
  • Fonction : Auteur
Jacques Pironon
Xuan Liu
  • Fonction : Auteur

Résumé

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.
Fichier principal
Vignette du fichier
Wei-2020-Minerals.pdf (10.54 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-03004026 , version 1 (13-11-2020)

Identifiants

Citer

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, 2020, 10 (5), pp.417. ⟨10.3390/min10050417⟩. ⟨hal-03004026⟩
44 Consultations
31 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More