Metasomatic alteration of volcanic-sedimentary terrane in the Early Devonian: Implication for the formation of the Mengxi porphyry copper deposit, eastern Junggar, Central Asian Orogenic Belt

2017 ◽  
Vol 53 ◽  
pp. 278-292 ◽  
Author(s):  
Haidong Zhang ◽  
Dequan Wang ◽  
Ruimei Wang ◽  
Jianchao Liu ◽  
Rongxi Li
Keyword(s):  
Porphyry Copper ◽  
Copper Deposit ◽  
Porphyry Copper Deposit ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Metasomatic Alteration ◽  
Early Devonian ◽  
Central Asian

Exhumation and Preservation of Paleozoic Porphyry Cu Deposits: Insights from the Yandong Deposit, Southern Central Asian Orogenic Belt

2021 ◽  
Author(s):  
Lin Gong ◽  
Barry P. Kohn ◽  
Zhiyong Zhang ◽  
Bing Xiao ◽  
Lin Wu ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Mineral Exploration ◽  
Porphyry Copper ◽  
Copper Deposit ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Porphyry Copper Deposits ◽  
Copper Deposits ◽  
Central Asian ◽  
Chinese Tianshan

Abstract Paleozoic porphyry copper deposits are generally much less common than their Mesozoic or Cenozoic counterparts, as they can be completely eroded in rapidly uplifting arcs. There are, however, some large Paleozoic porphyry copper deposits preserved worldwide, especially in the Central Asian orogenic belt, although the processes by which these ancient porphyry deposits were preserved are poorly constrained. The Carboniferous Yandong porphyry copper deposit was selected as a case study to resolve this issue using a combination of thermal history models derived from low-temperature thermochronology data and regional geologic records. Our results show that Yandong preserves a record of at least two episodes of cooling separated by a phase of mild Middle Jurassic reheating. These two cooling events included one major event, linked to the Qiangtang collision or northward motion of Tarim plate during the late Permian to Triassic, and one minor event, possibly related to the Lhasa collision or closure of Mongol-Okhotsk Ocean from the Middle Jurassic to Early Cretaceous, respectively. Tectonic quiescence and limited exhumation prevailed from the Late Cretaceous to Cenozoic in the Yandong area. Combining our results with regional geologic records, we propose that extensional tectonic subsidence, postmineralization burial, dry paleoclimatic conditions, and Cenozoic tectonic quiescence were key factors for the preservation of Yandong. This study demonstrates that anomalously old apatite fission track ages, integrated with age-elevation relationships, can have implications for mineral exploration strategies in the Chinese Tianshan orogens.

Oxidation Conditions of Granitic Magmas Associated With Porphyry Copper Deposits in the Central Asian Orogenic Belt

2014 ◽  
Vol 88 (s2) ◽  
pp. 601-602
Author(s):  
Ping SHEN ◽  
KeiKo HATTORI ◽  
Hongdi PAN ◽  
Simon JACKSON ◽  
Eleonora SEITMURATOVA ◽  
...  
Keyword(s):  
Porphyry Copper ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Porphyry Copper Deposits ◽  
Copper Deposits ◽  
Central Asian

scholarly journals Using Whole Rock and Zircon Geochemistry to Assess Porphyry Copper Potential of the Tonggou Copper Deposit, Eastern Tianshan

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 584
Author(s):  
Xue-Bing Zhang ◽  
Feng-Mei Chai ◽  
Chuan Chen ◽  
Hong-Yan Quan ◽  
Ke-Yong Wang ◽  
...  
Keyword(s):  
Fractional Crystallization ◽  
Porphyry Copper ◽  
Copper Deposit ◽  
Middle Part ◽  
Orogenic Belt ◽  
Geochemical Data ◽  
Eastern Tianshan ◽  
Porphyry Cu ◽  
Central Asian ◽  
Geochemical Analyses

Eastern Tianshan hosts a number of porphyry Cu deposits. However, these mainly formed in the Jueluotage Belt, in the middle part of Eastern Tianshan. The Tonggou porphyry Cu mineralization is an exception to this, since it is located in the Bogda Orogenic Belt, north of Eastern Tianshan. We obtained new zircon U-Pb ages, whole-rock geochemical data, zircon Hf isotope data, and zircon trace element compositions. LA-ICP-MS zircon U-Pb dating indicates a crystallization age of 302.2–303.0 Ma for the Tonggou mineralized granodiorite (TMG), which suggests that the Tonggou porphyry Cu mineralization formed in the Late Carboniferous period. εHf (t) data (1.8–14.1) for TMG suggests it was sourced from juvenile crustal melts, mixed with some mantle materials. TMG displays low ΣREE, compatible elements (Ba, Sr, Zr, and Hf), Zr/Hf and Nb/Ta ratios, as well as clearly negative Eu anomalies in whole rocks analyses. In addition, TMG is enriched in P, Hf and Th/U ratios in zircon, and has lower crystallization temperatures (734 to 735 °C) than the Daheyan barren granodiorite (DBG) (753 to 802 °C). Whole rock and zircon geochemical analyses show that the TMG was formed by fractional crystallization to a greater extent than the DBG in the Bogda Orogenic Belt. Moreover, zircon grains of the TMG show high Ce4+/Ce3+ ratios (159–286), which are consistent with related values from large porphyry deposits of the Central Asian Orogenic Belt (CAOB). High Ce4+/Ce3+ ratios reflect oxidizing magmas as a result of fractional crystallization, which indicates that the Tonggou deposit has potential to host a large porphyry Cu deposit.

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