Mesoarchean to Paleoproterozoic crustal evolution of the Taihua Complex in the southern North China Craton
Mesoarchean to Paleoproterozoic crustal evolution of the Taihua Complex in the southern North China Craton
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华北克拉通南部太华杂岩中太古代至古元古代地壳演化
DOI：
10.1016/j.precamres.2019.105451
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发表时间：
2020-02
影响因子：
3.8
通讯作者：
Liu Yin
中科院分区：
文献类型：
--
作者：
Jia Xiaoliang;Zhai Mingguo;Xiao Wenjiao;Li Liang;Ratheesh-Kumar R. T.;Wu Jialin;Liu Yin
泰华杂岩主要出露于中国克拉通北部南缘的中西部。本文采用野外地质、地球化学、LA-ICP-MS锆石U-Pb定年和Lu-Hf同位素分析等方法，对太华杂岩中太古代至古元古代(约2.9-1.8 Ga)的地壳演化进行了研究。2.90-2.73 Ga岩浆作用是同时期地壳生长和地壳改造的重要事件。其中2.90 Ga花岗闪长质包体具有与太古宙闪长岩相似的特征，是俯冲过程中橄榄岩地幔楔直接部分熔融形成的，代表早期陆核。2.84 Ga高Mg#TTGs起源于俯冲洋壳与地幔楔相互作用后的部分熔融作用，而2.82-2.77 Ga低Mg#TTGs起源于底侵玄武岩地壳的部分熔融，反映了一系列连续的弧状岩浆活动。与同期变质作用有关的2.75-2.73 Ga壳源花岗岩和长英质亮体的形成表明地壳深成作用的存在，这可能是一次重要的岩浆底侵作用的结果。2.9 ~2.73 Ga之间的岩浆作用表明，壳幔相互作用增强和地壳分异作用促进了太华杂岩中地壳的成熟化。2.57-2.43 Ga岩浆作用是太华杂岩中另一项突出的岩浆活动。TTg片麻岩和闪长片麻岩的年龄约为2.57-2.50 Ga，是在榴辉岩至石榴石角闪岩相条件下，初始熔体与地幔楔体相互作用下，水化玄武岩部分熔融形成的，表明不断俯冲导致了微块体的拼合。大约2.50-2.43 Ga期间伴随着变质作用的花岗岩、长英质白云母、类TTg片麻岩的侵入表明，与克拉通稳定作用有关的地壳深交事件占主导地位。2.36-2.24 Ga岩浆活动还以基岩改造为特征，表现为钙碱性二长片麻岩、A型花岗片麻岩和镁铁质岩墙的侵入。这一情景与火山-沉积层序的形成同步，表明太华杂岩中存在伸展事件。1.96-1.85 的Ga构造热事件代表了挤压变形和随后的变质作用的最后阶段，导致了先前存在的基底岩石的改造。该事件形成了一条沿北东向南缘延伸超过1000 km的WNW-ESE向变质带，与全球范围内与努纳超大陆拼合相关的造山作用相吻合。随后，广泛分布的A型花岗岩、镁铁质岩墙和火山岩形成，年龄约为1.84-1.74 Ga，标志着太华杂岩结晶基底的最终固结。此后，南方NCC趋于稳定，进入平台化发展阶段。
The Taihua Complex is exposed mostly in the central-western part along the southern margin of the North China Craton (NCC). In this study, field geological, geochemical, LA-ICP-MS zircon U-Pb age dating and Lu-Hf isotopic analysis are applied to the orthorgneisses, felsic leucosomes, and granites of the Taihua Complex, in order to provide constraints on its crustal evolution from the Mesoarchean to Paleoproterozoic (ca.2.9–1.8 Ga). Theca.2.90–2.73 Ga magmatism was an important episode of contemporaneous crustal growth and crustal reworking. Among them, theca.2.90 Ga granodioritic enclaves have features similar to those of the Archean sanukitoids, and were generated by the direct partial melting of peridotitic mantle wedge in the subduction processes, representing the early continental nucleus. Theca.2.84 Ga high Mg# TTGs were derived from the partial melting of subducted oceanic crust after interaction with mantle wedge, whereas theca.2.82–2.77 Ga low Mg# TTGs were originated from the partial melting of underplated basaltic crust, pointing to a series of continuous arc magmatic activities. The formation of theca.2.75–2.73 Ga crust-derived granites and felsic leucosomes in association with the contemporaneous metamorphism indicate the presence of a crustal anatexis, which probably was the result of an important magmatic underplating event. The magmatism between 2.9 Ga and 2.73 Ga indicates that the increased crust-mantle interaction and crustal differentiation stimulated the crust in the Taihua Complex to become more matural. Theca.2.57–2.43 Ga magmatism represents another prominent magmatism in the Taihua Complex. The TTG gneisses and dioritic gneisses aged atca.2.57–2.50 Ga were derived from partial melting of the hydrated basalts under eclogite to garnet amphibolite facies conditions with interaction between initial melts and mantle wedge, indicating that incessant subduction led to the amalgamation of micro-blocks. The intrusion of granitic rocks, felsic leucosomes, TTG-like gneisses accompanied by metamorphism duringca.2.50–2.43 Ga indicate that a dominant crustal anatexis event occurred in association with the cratonic stabilization processes. Theca.2.36–2.24 Ga magmatism was also characterized by reworking of the basement rocks, which are represented by the intrusion of calc-alkaline monzogneisses, A-type granitic gneisses and mafic dykes. This scenario was coeval with the formation of volcanic-sedimentary sequences, indicating the presence of an extension event in the Taihua Complex. Theca.1.96–1.85 Ga tectono-thermal event represented the last phase of compressional deformation and consequent metamorphism, leading to reworking of the pre-existed basement rocks. This event formed a WNW-ESE trending metamorphic belt that extends over 1000 km along the southern margin of the NCC and was well concordant with the world-wide orogeny associated with the amalgamation of Nuna supercontinent. Subsequently, widespread A-type granites, mafic dykes and volcanic rocks aged ofca.1.84–1.74 Ga formed, marking the final consolidation of the crystalline basement at the Taihua Complex. Since then, the southern NCC became stable and entered into the stage of development of platform.
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影响因子：
3.8
作者：
X. Long;C. Yuan;M. Sun;Guochun Zhao;W. Xiao;Yujing Wang;Yue-heng Yang;A. Hu
通讯作者：
X. Long;C. Yuan;M. Sun;Guochun Zhao;W. Xiao;Yujing Wang;Yue-heng Yang;A. Hu
影响因子：
3.9
作者：
M. Pankhurst;B. Schaefer;S. Turner;T. Argles;C. Wade
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M. Pankhurst;B. Schaefer;S. Turner;T. Argles;C. Wade
华北克拉通西北缘新太古代晚期幕式地幔熔融-地壳改造:阴山地块岩浆岩和变质岩的锆石年龄
影响因子：
3.8
作者：
Jian, Ping;Kroener, Alfred;Windley, Brian F.;Zhang, Qi;Zhang, Wei;Zhang, Liqao
通讯作者：
Zhang, Liqao
影响因子：
3.1
作者：
Jian Zhang;Guochun Zhao;San-zhong Li;M. Sun;Shuwen Liu;S. Wilde;A. Kröner;C. Yin
通讯作者：
Jian Zhang;Guochun Zhao;San-zhong Li;M. Sun;Shuwen Liu;S. Wilde;A. Kröner;C. Yin
影响因子：
6.1
作者：
Lei Liu;Xiaoyong Yang;M. Santosh;S. Aulbach
通讯作者：
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