eCite Digital Repository

LA-ICP-MS trace element analysis of pyrite from the Chang'an gold deposit, Sanjiang region, China: Implication for ore-forming process

Citation

Zhang, J and Deng, J and Chen, H-Y and Yang, L-Q and Cooke, D and Danyushevsky, L and Gong, Q-J, LA-ICP-MS trace element analysis of pyrite from the Chang'an gold deposit, Sanjiang region, China: Implication for ore-forming process, Gondwana Research, 26, (2) pp. 557-575. ISSN 1342-937X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The Authors

DOI: doi:10.1016/j.gr.2013.11.003

Abstract

The Chang'an gold deposit, Yunnan province is one of five large gold deposits in the Ailaoshan gold belt that is the most important ore belt of the Sanjiang Tethyan metallogenic domain. Geochemical study of pyrite in the deposit was conducted using laser ablation inductively coupled plasma mass spectroscopy. Three types of hydrothermal pyrite were identified in the ores and wall rocks, i.e., the coarse euhedral crystals in syenite (Py1), the coarse grains disseminated in altered sandstones or sandstone ores (Py2), and the fine-grained euhedral pyrite in sandstone ores (Py3). Their trace elements exhibit different concentrations, associations and rim–core zoning, implying different geneses and crystallization processes. The cores of Py1 were formed by magmatic fluids and have the lowest concentrations of Au, As, Cu and Zn. The cores of Py2 were formed by metamorphic fluids and have relatively high Au, Ag, Ni, Pb and Cu concentrations. The Py3 grains and the growth rims of Py1 and Py2 show consistently high contents of Au, As, Pb and Co, suggesting that all of them were rapidly deposited from a mixing fluid systemthatwas probably composed of fluids ofmetamorphic andmagmatic origins. This interpretation is supported by the observation that the high-grade ores generally contain lots of Py2 and Py3. Hence we consider that the deposit was formed during India–Asia collision, slightly postdate the 33–35 Ma tectono-magmatism.

Item Details

Item Type:Refereed Article
Keywords:gold, LA-ICP-MS, trace elements, pyrite, Chang'an gold deposit, Sanjiang Tethyan metallogenic domain
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Precious (Noble) Metal Ore Exploration
Author:Zhang, J (Ms Jing Zhang)
Author:Chen, H-Y (Dr Huayong Chen)
Author:Cooke, D (Professor David Cooke)
Author:Danyushevsky, L (Professor Leonid Danyushevsky)
ID Code:88917
Year Published:2013
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:36
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2014-02-20
Last Modified:2015-03-02
Downloads:0

Repository Staff Only: item control page