华东地质2026，Vol.47Issue(1)：3-28,26.DOI:10.16788/j.hddz.32-1865/P.2024.09.020
扬子地块太古宙—古元古代地质演化及其在Nuna超大陆中的重建
Archean-Paleoproterozoic geological evolution of the Yangtze Block and its reconstruction in the Nuna Supercontinent
摘要
Abstract
South China is one of the major Precambrian blocks in East Asia,the early continent growth of which was closely related to the evolution of supercontinents.The Yangtze Block(also known as the Yangtze Craton)in South China preserves a complete record of the Archean-Paleoproterozoic geology and is thus the key to characterize the Early Precambrian crustal growth,the crustal-mantle processes,and related tectonic evolution of South China,which can in turn provide important insights into the assembly and dispersal processes of the Pa-leoproterozoic Nuna Supercontinent.In this contribution,we summarize the distribution and lithological charac-ters of Archean-Paleoproterozoic rocks or rock units from the Yangtze Block.By synthesizing the available geochronological,isotopic,and geochemical data,we suggest that the Yangtze Block comprises several spatially isolated Archean-Paleoproterozoic crustal units.These crustal units are mostly exposed as tectonic massifs or metamorphic complexes,and are in fault contact with the Neoproterozoic or younger rocks.Though locally ex-posed in a relatively small area,these crustal units record a relatively prolonged,multistage crustal evolution since the Eoarchean(ca.3.8 Ga),featuring Early Archean crustal growth and/or reworking associated with formation of proto-continents and Late Archean crustal reworking leading to continental maturation,followed by continental accretion and formation of proto-Yangtze Craton during the Paleoproterozoic.Detailed comparison of the Archean-Paleoproterozoic crustal nature,ages and tectono-magmatic evolution shows differences among individ-ual crustal units of the Yangtze Block,indicating that they have distinct evolutionary trajectories and thus each could have been part of an early terrane or micro-continent.Middle to Late Paleoproterozoic(2.1-1.7 Ga)mag-matic and metamorphic events are documented to have affected much on the Yangtze Block,indicating internal assembly of various early terranes to form the proto-Yangtze Block in the context of early Nuna assembly,as well as its association with the formation of proto-craton.This is supported by results from deep seismic reflection pro-filing.Similarities in the Archean-Paleoproterozoic evolutionary processes between the western Yangtze and northern Laurentia,and between eastern or northeastern Yangtze and southern Siberia,suggest that they were like-ly close neighbors at the core Nuna Supercontinent.关键词
扬子地块(克拉通)/太古宙—古元古代/地壳演化/原始克拉通/Nuna超大陆Key words
Yangtze Block(Craton)/Archean-Paleoproterozoic/crustal evolution/proto-craton/Nuna Su-percontinent分类
天文与地球科学引用本文复制引用
王开,赵天宇..扬子地块太古宙—古元古代地质演化及其在Nuna超大陆中的重建[J].华东地质,2026,47(1):3-28,26.基金项目
中国地质调查局"秦岭成矿带区域地质调查(编号:DD20240031)"项目资助. （编号:DD20240031）
