Distribution of trace elements between carbonaceous matter and sulfides in a sediment-hosted orogenic gold system
Distribution of trace elements between carbonaceous matter and sulfides in a sediment-hosted orogenic gold system
复制标题
沉积物造山金系统中碳质和硫化物之间微量元素的分布
DOI：
10.1016/j.gca.2020.03.006
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发表时间：
2020-05
影响因子：
5
通讯作者：
Li Jian-Wei
中科院分区：
文献类型：
--
作者：
Wu Ya-Fei;Evans Katy;Fisher Louise A.;Zhou Mei-Fu;Hu Si-Yu;Fougerouse Denis;Large Ross R.;Li Jian-Wei
Carbonaceous matter (CM) plays a critical role in the formation of sediment-hosted ore deposits, but metal partitioning between CM and associated sulfides remains unclear. Here we use synchrotron X-ray fluorescence microscopy (SXRF), laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS), and nanoscale secondary ion mass spectrometry (NanoSIMS) to characterize the distribution and deportment of trace elements between CM and sulfides from the Daqiao orogenic gold deposit, China. Four types of CM co-existing with different generations of sulfides are recognized: sedimentary CM1 with pyrite polyframboids in black shale host; indigenous CM2 with early- to main-ore pyrite and marcasite; CM3 with main-ore pyrite; CM4 with pyrite porphyroblasts in underlying graphitic schists.The SXRF results reveal that As, Se, Ni, Pb, and Cu are enriched in pyrite polyframboids relative to CM1 in black shales, although a small proportion of As, Pb, Bi, and U is accommodated in the latter. NanoSIMS images show that Au and As are associated with the CM1 matrix within pyrite framboids that are overgrown by recrystallized pyrite rims. Most trace elements are enriched in the newly-formed aggregates of pyrite and marcasite relative to the CM2 rims that formed via the interactions between ore fluids and pre-existing CM2 cores. Gold, As, Tl, Se, and Hg are highly enriched in the main-ore pyrite relative to co-precipitated CM3 veinlets, and this deportment might reflect changes in fluid redox conditions in response to hydraulic fracturing that is the main mechanism of gold deposition. The pyrite porphyroblasts in the schists are enriched in As, Se, Ni, and Cu relative to CM4, but have lower Au, As, Co, Ni, and Pb than sedimentary pyrite framboids. Taken together, we suggest that biological activity causes accumulation of As and Au within CM interstitial to the framboidal pyrite, and that these elements are released during metamorphic recrystallization and hydrothermal replacement. Trace element deportment in hydrothermal CM and sulfides is controlled by a variety of factors such as the fluid chemistry and interaction between indigenous CM and fluids. Our quantitative results provide significant new insights into the complex processes that formed carbonaceous sediment-hosted ore systems worldwide.
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DOI：
10.1016/j.palaeo.2019.03.010
发表时间：
2019-05
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
D. Rickard
通讯作者：
D. Rickard
西秦岭造山带大桥沿带造山金矿床成矿过程：黄铁矿、白铁矿的结构、微量元素、硫同位素和碳质材料拉曼光谱的制约
DOI：
10.5382/econgeo.2018.4583
发表时间：
2018-08
期刊：
Economic Geology and the Bulletin of the Society of Economic Geologists
影响因子：
--
作者：
Wu Ya-Fei;Li Jian-Wei;Evans Katy;Koenig Alan E.;Li Zhan-Ke;O'Brien Hugh;Lahaye Yann;Rempel Kirsten;Hu Si-Yu;Zhang Zhong-Ping;Yu Jun-Peng
通讯作者：
Yu Jun-Peng
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
4.8
作者：
Y. Sung;J. Brugger;C. Ciobanu;A. Pring;W. Skinner;M. Nugus
通讯作者：
Y. Sung;J. Brugger;C. Ciobanu;A. Pring;W. Skinner;M. Nugus
影响因子：
3.3
作者：
S. Cox;V. Wall;M. Etheridge;T. F. Potter
通讯作者：
S. Cox;V. Wall;M. Etheridge;T. F. Potter