Growth of continental crust in intra-oceanic and continental-margin arc systems: Analogs for Archean systems

作     者：Timothy KUSKY Lu WANG 

作者机构：State Key Lab for Geological Processes and Mineral ResourcesCenter for Global TectonicsSchool of Earth SciencesChina University of GeosciencesWuhan 430074China Badong National Observatory and Research Station for GeohazardsChina University of GeosciencesWuhan 430074China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2022年第65卷第9期

页      面：1615-1645页

核心收录：

学科分类：070904[理学-构造地质学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 91755213, 41890834, 41888101, 41961144020, 42072228, and 41602234) the Chinese Ministry of Education (Grant No. BP0719022) the Chinese Academy of Sciences (Grant No. QYZDY-SSWDQC017) the MOST Special Fund (Grant No. MSF-GPMR02-3) the Open Fund of the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan) (Grant No. GPMR201704) 

主　　题：Oceanic arc Continental arc Accretionary orogen Archean Crustal growth 

摘      要：Earth’s continental crust has grown and been recycled throughout geologic history along convergent plate *** main locus of continental crustal growth is in intra-oceanic and continental-margin arc systems in Archean time. In arc systems, oceanic lithosphere is subducted to the deeper mantle, and together with its overlying sedimentary sequence is in some cases off-scraped to form accretionary prisms. Fluids are released from the subducting slab to chemically react with the mantle wedge, forming mafic-ultramafic metasomatites, whose partial melting generates mafic melts that rise up to form arcs. In intraoceanic arcs, they produce dominantly basaltic lavas, with a mid-crust that includes variably-developed vertically-walled intermediate plutons and higher-level dikes and sills. In continental-margin arcs, different petrogenetic processes cause assimilation and fractionation of basaltic magmas, partial melting/reworking of juvenile basaltic rocks, and mixing of mantle-and crust-derived melts, so they produce andesitic calc-alkaline melts but still have a mid-crust dominated by vertically-walled felsic plutons, which form 3-D dome-and-basin structures, akin to those in some Archean terranes such as parts of the Pilbara and Zimbabwe cratons. Notably, the continental crust of Archean times is dominated by tonalite-trondhjemite-granodiorite(TTG)plutons, similar to that of the mid-crust of these arc systems, suggesting that early continental crust may have formed largely by the amalgamation of multiple arc systems. The patterns of magmatism, in terms of petrogenesis, rock types, duration of magmatic and accretionary events, and the spatial scales of deformation and magmatism have remained essentially the same throughout geological history, demonstrating that plate tectonic processes characterized by subduction and arc magmatism have been in operation at least as long as recorded by the preserved geologic record, since the Eoarchean. However, the early Earth was dom