Whether short-lived or prolonged duration of multistage combined magmatic and hydrothermal events in the giant Chalukou porphyry Mo deposit, China
Whether short-lived or prolonged duration of multistage combined magmatic and hydrothermal events in the giant Chalukou porphyry Mo deposit, China
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中国岔路口巨型斑岩钼矿床多期岩浆热液联合事件的持续时间是短暂还是长期
DOI：
10.1016/j.oregeorev.2021.104576
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发表时间：
2021-11
影响因子：
3.3
通讯作者：
Lijun Liu
中科院分区：
文献类型：
--
作者：
Changming Wang;Jiaxuan Zhu;Leon Bagas;Qi Chen;Zhaochong Zhang;Hongyu Duan;Lijun Liu
The duration (or time scales) of multistage combined magmatic and hydrothermal events provides key information constraining the metallogenic history of porphyry deposits, but the duration (time scale) of the mineralising hydrothermal process remains uncertain. Here, we report zircon U–Pb isotopic age, fluorite Sm–Nd isochron ages, and Ti-in-quartz diffusion chronometry for the giant Chalukou porphyry Mo deposit with reserves of 2.46 Mt @ 0.087 wt% Mo in NE China. The deposit is genetically related to hydrothermal fluids associated with a Late Jurassic (148–147 Ma) porphyritic magmatic event coincident with our new fluorite Sm–Nd isochron age of 148 Ma. Porphyry Mo mineralisation is characterised by the superposition of multiple generations of crosscutting quartz-bearing veins including: quartz veins with minor magnetite and hematite associated with K-silicate alteration (A-veins), quartz-molybdenite veins with K-feldspar alteration halos that host the bulk of the Mo mineralisation (B-veins), and late base-metal mineralisation with phyllic alteration (D-veins), as well as post-mineralisation veins with argillic alteration. Hydrothermal veins from the Chalukou porphyry Mo deposit contain multiple generations of quartz that are distinct in their Ti concentrations and scanning electron microscope-cathodoluminescence images. The A-veins preserve subhedral to euhedral characteristics with alternating CL bright and dark growth zoning. The A-veins probably formed at a near-lithostatic pressure of ∼ 1.35 kbar and contain CL-bright quartz assaying 31–71 ppm Ti with Ti-in-quartz temperatures averaging 603 ± 30 °C, and CL-dark quartz assaying 6–25 ppm Ti with Ti-in-quartz temperatures averaging 496 ± 36 °C. The mineralised B-veins also CL-dark quartz, although they display less growth zoning with lower Ti assays of 0.4–27.9 ppm. These veins have near 0.7 kbar pressure and Titanium-in-quartz temperature averaging 390 ± 79 °C. The D-veins are dominated by CL-dark quartz and systematically lower Ti concentrations of 0.4–8 ppm, being lower than the relatively latter vein generations, formed at a temperature of 348 ± 58 °C and pressure of 0.4 kbars. The Ti diffusion in quartz has become a successful method constraining time scales and duration of magmatic and hydrothermal processes. Ti diffusion modelling indicates that the A-veins were deposited and cooled in a period between 2500 and 50,000 years. This shows that the earliest magma-related hydrothermal fluids activities formed within tens of thousands of years.
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影响因子：
2.7
作者：
O. Tomurtogoo;B. Windley;A. Kröner;G. Badarch;Dunyi Liu
通讯作者：
O. Tomurtogoo;B. Windley;A. Kröner;G. Badarch;Dunyi Liu
影响因子：
3
作者：
Zhen-zhen Li;K. Qin;Guangming Li;Luying Jin;Guoxue Song
通讯作者：
Zhen-zhen Li;K. Qin;Guangming Li;Luying Jin;Guoxue Song
影响因子：
6.1
作者：
Changming Wang;Jun Deng;L. Bagas;Qiao Wang
通讯作者：
Changming Wang;Jun Deng;L. Bagas;Qiao Wang
DOI：
--
发表时间：
1980-08
期刊：
--
影响因子：
--
作者：
C. Burnham;Ohmoto Hiroshi
通讯作者：
C. Burnham;Ohmoto Hiroshi
影响因子：
5
作者：
Huang, Ruifang;Audetat, Andreas
通讯作者：
Audetat, Andreas