scholarly journals Subduction of a spreading ridge within the Bangong Co–Nujiang Tethys Ocean: Evidence from Early Cretaceous mafic dykes in the Duolong porphyry Cu–Au deposit, western Tibet

2017 ◽  
Vol 41 ◽  
pp. 128-141 ◽  
Author(s):  
Wei Xu ◽  
Cai Li ◽  
Ming Wang ◽  
Jian-jun Fan ◽  
Hao Wu ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Spreading Ridge ◽  
Mafic Dykes ◽  
Porphyry Cu ◽  
Tethys Ocean

An early Cretaceous analogue of the ~2.5 Ga Malanjkhand porphyry Cu deposit, Central India

2016 ◽  
Vol 72 ◽  
pp. 1197-1212 ◽  
Author(s):  
Deepanker Asthana ◽  
Harshavardhan Kumar ◽  
S. Balakrishnan ◽  
Qunke Xia ◽  
Min Feng
Keyword(s):  
Early Cretaceous ◽  
Central India ◽  
Porphyry Cu ◽  
Porphyry Cu Deposit

Geochemistry and geochronology of gabbros from the Asa Ophiolite, Tibet: Implications for the early Cretaceous evolution of the Meso-Tethys Ocean

Lithos ◽  
2018 ◽  
Vol 320-321 ◽  
pp. 192-206 ◽  
Author(s):  
Xiao-Wen Zeng ◽  
Ming Wang ◽  
Jian-Jun Fan ◽  
Cai Li ◽  
Chao-Ming Xie ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Tethys Ocean

scholarly journals Tectono-magmatic controls on decratonic gold deposits

2021 ◽  
Vol 176 (9) ◽  
Author(s):  
Jia Chang ◽  
Andreas Audétat ◽  
Jian-Wei Li
Keyword(s):  
Numerical Modeling ◽  
Early Cretaceous ◽  
North China Craton ◽  
North China ◽  
Melt Inclusions ◽  
Mineral Exploration ◽  
Gold Deposits ◽  
Porphyry Cu ◽  
The North ◽  
Icp Ms

AbstractMagmatic-hydrothermal gold–copper deposits in post-subduction settings represent essential targets for mineral exploration, but controls on their formation remain controversial. The early Cretaceous lode Au districts that formed during lithosphere destruction of the North China Craton provide an ideal opportunity to better understand the key tectono-magmatic factors responsible for the genesis of Au-rich deposits in post-subduction settings. Here, we present a LA-ICP-MS study of silicate melt inclusions and sulfide inclusions from ore-related mafic to intermediate rocks in the central Taihangshan Au district in the interior of the North China Craton to constrain the content and evolution of magmatic ore metals ± volatiles. The results, combined with numerical modeling, suggest that the ore-related magmas contained only a few ng/g Au, which is similar to the Au content of non-mineralization-related mafic to intermediate magmas worldwide. The low Au content of the lode Au-related magmas suggest that large volumes of magmas had to accumulate in the middle to lower crust through trans-lithospheric fault systems to produce the lode Au deposits. It is further suggested that the lode Au-related magmas were alkali-rich, hydrous, oxidized and relatively rich in sulfur and chlorine (mafic melt inclusions contain 0.14‒0.24 wt% S and 0.1‒0.2 wt% Cl). These properties are considered critical for the generation of auriferous ore fluids. By comparing the tectono-magmatic setting of the giant Jiaodong Au province (~ 4000 t Au) with the central Taihangshan district (~ 150 t Au), we propose that the much larger total Au tonnage of the Jiaodong district results from the accumulation of a much larger volume of ore-forming magmas at deep crustal levels, induced by a stronger degree of lithosphere modification. In addition, given that the composition of lode Au-related magmas is similar to that of porphyry Cu–Au-related magmas, the lack of giant, early Cretaceous porphyry Cu–Au deposits in the North China Craton suggests that strong extensional settings favor the formation of lode Au deposits instead of porphyry Cu–Au deposits. The present study, therefore, has general implications for the genesis of Au-rich deposits in strongly extensional settings.

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