Voluminous continental growth of the Altaids and its control on metallogeny  

作　　者：Tao Wang He Huang Jianjun Zhang Chaoyang Wang Guangyue Cao Wenjiao Xiao Qidi Yang Xuewei Bao 

机构地区：[1]Beijing SHRIMP Center,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China [2]Key Laboratory of Earth Probeand Geodynamics,Chinese,Academy of Geological Sciences,Beijing 100037,China [3]National Key Laboratory of Arid Area Ecological Security and Sustainable Development,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [4]Wuhan Center of China Geological Survey,Wuhan 430205,China [5]School of Earth Sciences,Zhejiang University,Hangzhou 310058,China

出　　处：《National Science Review》2023年第2期64-79,共16页国家科学评论（英文版）

基　　金：supported by the National Key Technologies R&D Program of China(2019YFA0708600 and 2018YFE0204202);the National Natural Science Foundation of China(41830216,92162322,41802074 and 41888101);the Geological Survey Program of China(DD20221647,DD20221645 and DD20221648)。

摘　　要：The Altaids is generally considered to be the largest Phanerozoic accretionary orogen on Earth,but it is unclear whether it was associated with extensive continental crustal growth and whether there is a link between the crustal growth and ore mineralization.This paper reviews whole-rock Nd and zircon Hf isotope data for felsic-intermediate-mafic igneous rocks in the Altaids and presents Nd+Hf isotopic contour maps for this region.The maps highlight the 3D lithospheric compositional architecture of the Altaids and make it possible to quantitatively evaluate the crustal growth and its relationship with ore deposits.The Altaids hosts~4107350 km^(2)and~184830750 km^(3)(assuming a crustal thickness of 40-50 km)juvenile crust(εNd(t)>0),accounting for 58% by isotope-mapped area(~7010375 km2)of almost all outcrops of the Altaids(~8745000 km2)and formed during 1000-150 Ma(mainly 600-150 Ma).The juvenile crustal,slightly juvenile-reworked crustal and slightly reworked crustal provinces controlled the Cu-Au,the Pb-Zn-Ag and the Li-Be,Nb-Ta and W-Sn ore deposits.According to the crustal architecture and background of deep compositions,we propose that the ore deposits can be grouped into three types:juvenile crust-related,mixed-source(or slightly juvenile crust)-related and reworked crust-related.This highlights the close relationship between accretion,continental growth and mineralization,and will facilitate exploration for specific ore-deposit types in the Altaids.

关 键 词：3D lithospheric architecture architecture evolution juvenile crust igneous rocks isotopic mapping METALLOGENY Central Asian Orogenic Belt(CAOB) 

分 类 号：P542.2[天文地球—构造地质学] P611[天文地球—地质学]