scholarly journals EVOLUTION OF MAGMATIC-HYDROTHERMAL SYSTEM OF THE KALAXIANGE’ER PORPHYRY COPPER BELT AND IMPLICATIONS FOR ORE FORMATION (Xinjiang, China)

2015 ◽  
Vol 56 (8) ◽  
Keyword(s):  
Hydrothermal System ◽  
Porphyry Copper ◽  
Ore Formation

Evolution of magmatic-hydrothermal system of the Kalaxiange’er porphyry copper belt and implications for ore formation (Xinjiang, China)

2015 ◽  
Vol 56 (8) ◽  
pp. 1114-1127 ◽  
Author(s):  
Gao Jinggan ◽  
Li Wenyuan ◽  
Xue Chunji ◽  
Tu Qijun ◽  
Zhao Zhanfeng ◽  
...  
Keyword(s):  
Hydrothermal System ◽  
Porphyry Copper ◽  
Ore Formation

Characteristics of the hydrothermal system of the porphyry copper (gold) deposit at Shaxi, Eastern China

2021 ◽  
pp. 683-685
Author(s):  
Qijang Ren ◽  
Bing Fu ◽  
Wenxuan Hu ◽  
Wenyi Xu ◽  
Zhenhao Duan ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Hydrothermal System ◽  
Porphyry Copper ◽  
Eastern China ◽  
Copper Gold

scholarly journals An abrupt switch in magmatic plumbing taps porphyry copper deposit-forming magmas

2021 ◽  
Author(s):  
Lawrence Carter ◽  
Simon Tapster ◽  
Ben Williamson ◽  
Yannick Buret ◽  
David Selby ◽  
...  
Keyword(s):  
Porphyry Copper ◽  
Copper Deposit ◽  
Ore Deposits ◽  
Green Technology ◽  
Ore Formation ◽  
Porphyry Deposits ◽  
Order Of Magnitude ◽  
Magmatic Plumbing System ◽  
Lower Crustal ◽  
Melt Evolution

Abstract Porphyry-type deposits are a vital source of green technology metals such as copper and molybdenum. They typically form in subduction-related settings from large, long-lived magmatic systems. The most widely accepted model for their formation requires that mantle-derived magmas undergo a multi-million year timescale ramp-up in volatiles and ore-forming constituents in mid- to lower-crustal reservoirs, however this does not explain why porphyry deposits are absent from the vast majority of arc magmatic systems. To address this, we have carried out geochemical and geochronological studies on the tilted, ~8 km depth equivalent, cross-section through the classic Yerington magmatic system, Nevada. Here we show that the magmas underwent a major and abrupt change in chemistry over a period of 100 kyrs which is coincident with the initiation of ore formation. This is attributed to a wholesale switch in the magmatic plumbing system whereby volatile-rich granitic melts were extracted from an estimated ~30 km depth and transported to shallow levels (~3-8 km) where exsolving fluids were focussed through highly permeable pathways to form porphyry deposits. The change in magma chemistry is documented across the entire plutonic to volcanic record. Its rapidity suggests that the increase in a magma’s ore-forming potential is not solely driven by tectonic factors, that occur over multi-million year scales, but through internal processes within the melt evolution zone, operating at more than an order of magnitude faster than previously envisaged. This short timescale narrows the temporal-geochemical footprint of magmas associated with porphyry mineralisation which will aid in targeting the next generation of ore deposits.

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