阿尔泰造山带伟晶岩型稀有金属矿化类型与成岩成矿时代/Types,Intrusive and Mineralization Ages of Pegmatite Rare-element Deposits in Chinese Altay[J]

新疆阿尔泰地区是世界闻名的稀有金属伟晶岩产区，其成岩成矿时代尚存很大争议。伟晶岩就位时代的厘定对该区伟晶岩型矿化的期次、类型划分和产出构造背景的研究及矿产评价至关重要。在典型伟晶岩脉系统调查基础上，通过对阿尔泰代表性稀有金属矿化伟晶岩和伟晶岩型稀有金属矿床的锆石LA-ICP MS U-Pb定年，获得一批新的年龄结果：阿斯喀尔特Be矿床(200.7±6.5) Ma、可可托海矿集区的可可托海3号脉Li-Be-Nb-Ta-Cs矿床180~186 Ma、柯鲁木特-吉得克矿集区的柯鲁木特112号脉(191.8±1.4) Ma、库卡拉盖650号脉(207.9±5.1) Ma和群库尔Be矿床(194.3±1.6) Ma、卡拉额尔齐斯矿集区的虎斯特Be矿化伟晶岩(195.9±2.4) Ma、大喀拉苏-可可西尔矿集区的大喀纳苏Be-Nb-Ta矿床(231.8±7.4) Ma、小卡拉苏-切别林矿集区的小喀纳苏Li-Nb-Ta矿床(296.3±9.0) Ma和苇子沟Be矿床(248.2±2.2) Ma。阿尔泰伟晶岩型稀有金属矿床可划分为加里东期、海西期、印支期至燕山早期4期。阿尔泰造山带北西和南东端矿集区的形成时代集中在370~480 Ma，其他矿集区伟晶岩时代集中在180~250 Ma。造山作用峰期(加里东期与海西早期)形成的伟晶岩多为工业白云母型和REE-Nb型，造山后与非造山阶段(二叠纪-中侏罗世)形成的伟晶岩多为稀有金属型(矿化类型包括Be，Li，Li-Be-Nb-Ta-Cs组合)

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^