Geochronology of the Chakabeishan Li–(Be) rare-element pegmatite, Zongwulong orogenic belt, northwest China: Constraints from columbite–tantalite U–Pb and muscovite–lepidolite 40Ar/39Ar dating

• DOI: 10.1016/j.oregeorev.2022.104930
• Publication Date: 2022-05-13T08:35:59Z
• Authors: Jin-Heng Liu; Qiang Wang; Chuan-Bing Xu; Jin-Sheng Zhou; Bing-Zhang Wang; Wu-Fu Li; Shan-Ping Li; Tong-Yu Huang; Qing-He Yan; Tai-Zhong Song; Chun-Tao Wang; Ying Zheng; Jin-Shou Wang
• Keywords: Pegmatite; Muscovite; Columbite; Spodumene; Geochronology; Massif

Lithium–(beryllium) are important strategic metals in modern industries. The Markam–Yajiang–Karakoram (MYK) giant Li ore belt (>14 Mt Li2O) is located the central Qinghai–Tibetan Plateau, and a world-class deposit belt. reported pegmatite deposits mainly found Tianshuihai–Songpan–Garzê Terrane (TSGT) generally considered to be related Late Triassic S-type granites flysch sedimentary rocks. Recently, abundant veins have also been discovered an adjacent terrane (i.e., North Qaidam Terrane) north of MYK belt, but it unclear whether these newly pegmatites genetic Here, we report high-precision columbite–tantalite coltan) U–Pb ages muscovite–lepidolite 40Ar/39Ar for Li–(Be) rare-element from (NQT) Chakabeishan area Zongwulong orogenic Coltan grains three spodumene-bearing samples yielded weighted-mean 207Pb-corrected 214.9 ± 1.7, 217.0 2.3, 215.0 1.5 Ma. Muscovite dating two one barren sample plateau 213.00 0.97, 211.67 0.35, 211.78 0.29 Ma, respectively. A lepidolite age lepidolite-bearing 216.62 0.88 subtle differences obtained by different methods within reasonable error estimates or may due closure temperatures. ore-forming similar those This data previous studies suggest that were formed post-collisional setting after Paleo-Tethys (Anyemaqen) Ocean. study has implications understanding origins indicating formation was not solely associated with Our results exploration, which extends potential Terrane.