Evidence for two-fluid mixing at Pine Point, NWT

被引：16

作者：

Adams, JJ ^{[1
]}

Rostron, BJ ^{[1
]}

Mendoza, CA ^{[1
]}

机构：

[1] Univ Alberta, Edmonton, AB T6G 2E3, Canada

来源：

JOURNAL OF GEOCHEMICAL EXPLORATION | 2000年 / 69卷

关键词：

Mississippi Valley-type deposits; O-18; water-rock interaction; fluid inclusions; regional hydrogeology; brines;

D O I：

10.1016/S0375-6742(00)00014-5

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

New interpretation of geochemical data for gangue and ore minerals at the Pine Point Mississippi Valley-type ore district constrains the sulphide precipitation mechanism and the conceptual models for the ore-district flow system. Fluid inclusion homogenization temperatures and salinities along with signatures of epigenetic hydrothermal carbonates at Pine Point show a distinctive shift in chemical character of the parent fluid between the regional flowpath and the ore deposit site. Water-rock ratio modelling and parent fluid salinities indicate that a second, more saline, O-18-enriched brine, mixed with Presqu'ile barrier fluids near Pine Point and initiated ore precipitation. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：103 / 108

页数：6

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