Boiling and mixing of hydrothermal fluids in the Wharekirauponga rhyolite-hosted epithermal gold-silver deposit, Hauraki goldfield, New Zealand

被引：0

作者：

Christie, AB ^{[1
]}

Faure, K ^{[1
]}

Rabone, SDC ^{[1
]}

Barker, RG ^{[1
]}

机构：

[1] Inst Geol & Nucl Sci, Lower Hutt, New Zealand

来源：

MINERAL EXPLORATION AND SUSTAINABLE DEVELOPMENT, VOLS 1 AND 2 | 2003年

关键词：

Wharekirauponga; New Zealand; epithermal gold-silver deposit; rhyolite; hydrothermal alteration; fluid inclusions; oxygen isotopes; boiling; mixing;

D O I：

暂无

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

Wharekirauponga is a low sulphidation, epithermal Au-Ag deposit hosted in a Late Miocene rhyolite dome complex. Electrum is present in sheeted to stockwork quartz veins and disseminated in the host rocks. Quartz + adularia alteration grades outward to quartz + illite, quartz + interlayered illite-smectite and quartz + kaolinite + smectite alteration zones. Boiling is indicated by crustiform and colloform banding, platy quartz pseudomor-phous, adularia, a wide range in fluid inclusion T-h (183-249 degreesC), and vapour-rich fluid inclusions. Estimated delta(18)O(water) values vary between -6.6 and +4.7 parts per thousand. Below elevations of c. 100 in asl, two isotopically different fluids are seen: a deep fluid with delta(18)O(water) -0 parts per thousand and another around -3 parts per thousand (mixed deep fluid + heated groundwater). At elevations >100 m, delta(18)O(water) values trend toward values (-6parts per thousand) typical of local meteoric water. However, some samples trend toward heavier values (up to +4.7 parts per thousand) due to boiling. The deep fluid contained either a magmatic (5-10 parts per thousand) component or delta(18)O-shifted meteoric water.

引用

页码：453 / 456

页数：4

共 26 条

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