qinling orogen
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2022 ◽  
Vol 804 ◽  
pp. 150218
Author(s):  
Zemin Qin ◽  
Shuting Zhao ◽  
Taoran Shi ◽  
Fengyang Zhang ◽  
Ziru Pei ◽  
...  

2021 ◽  
Author(s):  
Hao-Cheng Yu ◽  
Kun-Feng Qiu ◽  
Franco Pirajno ◽  
Peng-Cong Zhang ◽  
Wen-Qi Dong

2021 ◽  
Vol 11 (18) ◽  
pp. 8756
Author(s):  
Changming Wang ◽  
Shicheng Rao ◽  
Kangxing Shi ◽  
Leon Bagas ◽  
Qi Chen ◽  
...  

Rutile is an important ore mineral to meet the increasing demand of critical metal Ti in various sectors. Here we report a rare example of rutile deposits hosted within the Baishugang–Wujianfang amphibolite-facies metamorphic rocks in the East Qinling Orogen, central China. The rutiles are mostly located within or along the margins of biotite and show 94.6 to 99 wt% TiO2. Rutiles occur as chains, thin layers along the foliation, and dense clusters. The grains are coexisted with magnetite. Based on Zr-in-rutile thermometer the estimated crystallisation temperature is at 630 °C at 7.0 kba. Based on Cr/Nb ratio, the source of the rutile is correlated with Ti-bearing silicate minerals such as biotite from aluminous sedimentary protoliths. The rutile deposit formed during lower amphibolite-facies metamorphism, and is distinct from the eclogite- and granulite-related types elsewhere in the orogen. The LA-ICP-MS U–Pb analyses of rutiles from the deposit yield lower intercept 238U/206Pb ages of 386 ± 16 Ma at the Baishugang–Wujianfang district. These ages correspond to a Devonian arc–continent collisional event between the South and North Qinling domains in the East Qinling Orogen.


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