Baddeleyite U-Pb Geochronology of Rare Metal Mineralized Carbonatite and Peridotite in Dagele Area of East Kunlun Orogen and Its Prospecting Significance
Wang Bingzhang
Li Wufu
Jin Tingting
Zhang Han
Li Yulong
Fu Changlei
Liu Jiandong
Wang Tao
Xue Wanwen
Wang Taishan
Abstract：The rare-metal and rare-earth mineralized alkaline-carbonatite complex was first discovered in the Dagele area of East Kunlun orogen.This discovery indicates that the East Kunlun orogen has great prospects for rare-metal mineralization.Related studies are vital for understanding the geological processes and searching for rare-metal deposits in East Kunlun orogen.This study reports the geochemistry and geochronology of baddeleyites from peridotite and carbonatite within the Dagele alkaline complex.Baddeleyites from peridotite mainly contain ZrO2(96.48%-97.21%)with minor HfO2(0.83%-1.17%)and Nb2O5(0.61%-0.93%).After common Pb correction using measured 207Pb,they yield weighted average ages of 381.0±2.3 Ma and 417.5±3.4 Ma with low intercept ages of 381.1±2.3 Ma and 417.7±3.4 Ma,respectively.Baddeleyites from carbonatite are mainly composed of ZrO2(91.1%),followed by HfO2(4.3%),Nb2O5(1.22%),and FeO(2.31%).They yield weighted average ages of 381.5±2.5 Ma and 416.5±4.5 Ma with low intercept ages of 381.8±1.8 Ma and 416.7±4.5 Ma,respectively.It is inferred that the carbonatite and peridotite are formed at 381.8 Ma and 417.7 Ma,respectively.There are at least two stages of enrichment of Nb in the silica-unsaturated magma.Post-collisional and post-orogenic lithosphere extension and partial melting of mantle beneath the East Kunlun collisional orogen were considered as the geodynamic mechanism for its formation.Therefore,it is suggested that the Late Silurian-Devonian is an important period of rare-metal mineralization.The area between Dagela and Nuomuhong River is one of the important regions for prospecting of rare-metal mineralization.
Keywords：East KunlunDageleperidotitecarbonatitebaddeleyiterare metalsgeochemistrypetrology
Publication Date：2024-04-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 1245-1260 )