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| 1 | On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt显示文摘The Shaitian granite complex(SGC)spans more than 80 Ma of crustal growth in the Arabian–Nubian Shield in southeast Egypt.It is a voluminous composite intrusion(60 km2)comprising a host tonalite massif intruded by subordinate dyke-like masses of trondhjemite,granodiorite and monzogranite.The host tonalite,in turn,encloses several,fine-grained amphibolite enclaves.U-Pb zircon dating indicates a wide range of crystallization ages within the SGC(800±18Ma for tonalites;754±3.9 Ma for trondhjemite;738±3.8 Ma for granodiorite;and 717±3.2 Ma for monzogranite),suggesting crystallization of independent magma pulses.The high positiveεNdi(+6–+8)indicate that the melting sources were dominated by juvenile material without any significant input from older crust.Application of zircon saturation geothermometry indicates increasing temperatures during the generation of melts from 745±31℃ for tonalite to 810±25℃ for trondhjemite;840±10℃ for granodiorite;and 868±10℃ for monzogranite.The pressure of partial melting is loosely constrained to be below the stability of residual garnet(<10 kbar)as inferred fromthe almost flat HREE pattern((Gd/Lu)N=0.9–1.1),but>3 kbar for the stability of residual amphibole as inferred from the significantly lower NbN and TaN compared with LREEN and the sub-chondrite Nb/Ta ratios exhibited by the granitic phases.The inverse relation between the generation temperatures and the ages estimates of the granitoid lithologies argue against a significant role of fractional crystallization.The major and trace element contents indicate the emplacement of the SGC within a subduction zone setting.It lacks distinctive features for melt derived from a subducted slab(e.g.high Sr/Y and high(La/Yb)N ratios),and the relatively low MgO and Ni contents in all granite phases within the SGC suggest melting within the lower crust of an island arc overlying a mantlewedge.Comparisonwith melts produced during melting experiments indicates an amphibolite of basaltic composition is the best candidate as source for the tonalite,trondhjemite and granodiorite magmas whereas the monzogranite magma is most consistent with fusion of a tonalite protolith.Given the overlapping Sm-Nd isotope ratios as well as several trace element ratios between monzogranite and tonalite samples,it is reasonable to suggest that the renewed basaltic underplating may have caused partialmelting of tonalite and the emplacement ofmonzogranite melt within the SGC.The emplacement of potassic granite(monzogranite)melts subsequent to the emplacement of Na-rich granites(tonalitetrondhjemite-granodiorite)most likely suggests major crustal thickening prior arc collision and amalgamation into the over thickened proto-crust of the Arabian-Nubian shield.Eventually,after complete consolidation,the whole SGC was subjected to regional deformation,most probably during accretion to the Saharan Metacraton(arc–continent collisions)in the late Cryogenian-Ediacaran times(650–542 Ma). | Ali A.Khudeir Jean-Louis Paquette Kirsten Nicholson Åke Johansson Tyrone O.Rooney Sadiq Hamid Mohamed A.El-Fadly Loretta Corcoran Shawn J.Malone Mohamed Ali Abu El-Rus | 2021 | Geoscience Frontiers2021，12，4： | 0 |
| 2 | 阿拉伯地盾地质构造演化与关键地质矿产问题浅析显示文摘阿拉伯地盾位于阿拉伯板块的西南部,与红海西岸的努比亚地盾共同组成努比亚−阿拉伯地盾,是新元古代东、西冈瓦纳大陆汇聚过程中形成的泛非造山带的重要组成部分。在“沙特阿拉伯地盾精细地质填图”技术标编制过程中,笔者综合分析了该区的地质调查和研究成果,总结了阿拉伯地盾8个次级地体、主要蛇绿岩构造混杂岩带及新元古代沉积盆地的地质特征,并将阿拉伯地盾的地质演化细分为4个构造演化阶段。其中,在新元古代洋−陆转化过程中阿拉伯地盾形成了一系列重要的矿产资源。在此基础上,系统梳理了区内地层、构造、岩浆作用及与成矿相关的地质问题,提出了未来精细地质填图过程中的工作建议。 | 查显锋 计文化 辜平阳 吕鹏瑞 王国强 陈锐明 康磊 李猛 孙吉明 荆德龙 王凯 罗克勇 | 2023 | 西北地质2023，56，5： | 0 |
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