Geochemical variations of the Late Mesozoic granitoids in the southern margin of North China Craton: A possible link to the tectonic transformation from compression to extension

2019 ◽  
Vol 75 ◽  
pp. 118-133 ◽  
Author(s):  
Shaohao Zou ◽  
Deru Xu ◽  
Teng Deng ◽  
Qinyi Huang ◽  
Deshui Yu ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Late Mesozoic ◽  
Southern Margin ◽  
Geochemical Variations ◽  
Mesozoic Granitoids

PRECISE AGES FOR LODE GOLD MINERALIZATION IN THE XIAOQINLING GOLD FIELD, SOUTHERN MARGIN OF THE NORTH CHINA CRATON: NEW CONSTRAINTS FROM IN SITU U-Pb DATING OF HYDROTHERMAL MONAZITE AND RUTILE

2020 ◽  
Author(s):  
Junchen Liu ◽  
Yitian Wang ◽  
Jingwen Mao ◽  
Wei Jian ◽  
Shikang Huang ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Gold Mineralization ◽  
Late Mesozoic ◽  
The North ◽  
Southern Margin ◽  
Lithospheric Extension ◽  
Gold Producer ◽  
Gold Bearing

Abstract The Xiaoqinling gold field, located along the southern margin of the North China craton, is the second largest gold producer in China, which comprises more than 1,200 auriferous quartz veins with a proven gold reserve of at least 800 tons. Previously, the absolute age of the gold metallogenesis in this area has not been well defined due to the lack of suitable dating minerals. This study presents new in situ laser ablation-inductively coupled plasma-mass spectrometry U-Pb ages of coexisting hydrothermal monazite and rutile for the Fancha gold deposit in this area, which yielded 206Pb/238U ages of 127.5 ± 0.7 Ma (n = 65, mean square of weighted deviates [MSWD] = 1.8) and 129.7 ± 4.3 Ma (n = 37, MSWD = 1.4), respectively. Both ages overlap within analytical uncertainty at the 2σ level of significance, suggesting that both gold-bearing veins were emplaced at ca. 128 Ma. Mineralogical observations indicate that the monazite and rutile precipitated simultaneously with gold from the hydrothermal fluid. Our new data, combined with recently published monazite age, define a more precise gold episode, demonstrating that the gold endowment of the Xiaoqinling area was formed during a relatively brief period at ca. 130 to 127 Ma. We suggest that auriferous fluids were generated as a result of interactions between the enriched mantle and the lower crust, which was driven by westward flat slab subduction of the Paleo-Pacific plate during the late Mesozoic. The peak of lithospheric thinning during the postsubduction may have led to the rapid release of gold from the fertilized mantle. Consequently, the large number of gold-bearing veins in the Xiaoqinling area may ultimately be related to the tectonic evolution and mantle fluid processes that occurred during Early Cretaceous lithospheric extension.

Late Mesozoic felsic magmatism and Mo-Au-Pb-Zn mineralization in the southern margin of the North China Craton: A review

2018 ◽  
Vol 161 ◽  
pp. 103-121 ◽  
Author(s):  
Taiping Zhao ◽  
Lei Meng ◽  
Xinyu Gao ◽  
Chang Jin ◽  
Qiang Wu ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Late Mesozoic ◽  
The North ◽  
Southern Margin
Sign in / Sign up

Export Citation Format

Share Document