GSTDTAP  > 地球科学
DOI10.1073/pnas.2100689118
Colloidal transport and flocculation are the cause of the hyperenrichment of gold in nature
Duncan F. McLeish; Anthony E. Williams-Jones; Olga V. Vasyukova; James R. Clark; Warwick S. Board
2021-05-18
发表期刊Proceedings of the National Academy of Science
出版年2021
英文摘要

Aqueous complexation has long been considered the only viable means of transporting gold to depositional sites in hydrothermal ore-forming systems. A major weakness of this hypothesis is that it cannot readily explain the formation of ultrahigh-grade gold veins. This is a consequence of the relatively low gold concentrations typical of ore fluids (tens of parts per billion [ppb]) and the fact that these “bonanza” veins can contain weight-percent levels of gold in some epithermal and orogenic deposits. Here, we present direct evidence for a hypothesis that could explain these veins, namely, the transport of the gold as colloidal particles and their flocculation in nanoscale calcite veinlets. These gold-bearing nanoveinlets bear a remarkable resemblance to centimeter-scale ore veins in many hydrothermal gold deposits and give unique insight into the scale invariability of colloidal flocculation in forming hyperenriched gold deposits. Using this evidence, we propose a model for the development of bonanza gold veins in high-grade deposits. We argue that gold transport in these systems is largely mechanical and is the result of exceptionally high degrees of supersaturation that preclude precipitation of gold crystals and instead lead to the formation of colloidal particles, which flocculate and form much larger masses. These flocculated masses aggregate locally, where they are seismically pumped into fractures to locally form veins composed largely of gold. This model explains how bonanza veins may form from fluids containing ppb concentrations of gold and does not require prior encapsulation of colloidal gold particles in silica gel, as proposed by previous studies.

领域地球科学
URL查看原文
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/326763
专题地球科学
推荐引用方式
GB/T 7714
Duncan F. McLeish,Anthony E. Williams-Jones,Olga V. Vasyukova,et al. Colloidal transport and flocculation are the cause of the hyperenrichment of gold in nature[J]. Proceedings of the National Academy of Science,2021.
APA Duncan F. McLeish,Anthony E. Williams-Jones,Olga V. Vasyukova,James R. Clark,&Warwick S. Board.(2021).Colloidal transport and flocculation are the cause of the hyperenrichment of gold in nature.Proceedings of the National Academy of Science.
MLA Duncan F. McLeish,et al."Colloidal transport and flocculation are the cause of the hyperenrichment of gold in nature".Proceedings of the National Academy of Science (2021).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Duncan F. McLeish]的文章
[Anthony E. Williams-Jones]的文章
[Olga V. Vasyukova]的文章
百度学术
百度学术中相似的文章
[Duncan F. McLeish]的文章
[Anthony E. Williams-Jones]的文章
[Olga V. Vasyukova]的文章
必应学术
必应学术中相似的文章
[Duncan F. McLeish]的文章
[Anthony E. Williams-Jones]的文章
[Olga V. Vasyukova]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。