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Late Neoproterozoic adakitic magmatism of the eastern Arabian Nubian Shield

Geoscience Frontiers 2019年第6期10卷 1981-1992页

作者： Grant M.Cox John Foden Alan S.Collins Centre for Tectonics Resources and Exploration(TRaX) Dept of Earth SciencesThe University of Adelaide

Late Neoproterozoic adakitic magmatism within the Eastern Arabian Nubian Shield has been dated at633.2±9.0 Ma(2σ).These magnas intrude the forearc Ad Dawadimi Basin,which is composed of metapelitic schists and greywacke along with ophiolitic melanges of boninitic affinity which underwent inversion and deformation by^620 *** adakitic magmatism,while intruding parts of the Ad Dawadimi Basin,predates this deformation,but is possibly coincident with basin *** adakitic magmatism requires melting of an amphibolite or eclogitic source,empirical and experimental constraints require anomalously hot supra-subduction zone *** that this magmatism immediately predates basin inversion,these magmas possibly pinpoint the timing of the slab breaking,marking the terminal stages of arc magmatism,terrane accretion and the influx of hot oceanic asthenospheric *** influx of hot asthenospheric mantle may also be responsible for postcolltsional A-type magmatism.

关键词： Arabian Nubian Shield adakites A-type magmatism

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Petrogenesis of Jurassic Granitoids on Liaodong Peninsula,Northeast China:Constraints on the Evolution of the Mongol-Okhotsk and Pacific Tectonic Regimes

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Journal of Earth Science 2021年第1期32卷 127-143页

作者： Jinyu Li Ye Qian Leontine Tekoumc Changji Zhao Jinlei Sun Tao Zheng Fengyue Sun Yanjie Shen College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Nature ResourcesChangchun 130061China Laboratory of Geology Faculty of SciencesUniversity of N'djamenaN'djamena 1027Republic of Chad

The tectonic setting of Jurassic magmatism in the Northeast China(NE China)is ***,we present new petrological,whole-rock geochemical,zircon U-Pb geochronological,and zircon Lu-Hf isotope data for Jurassic granitoids of the Wulong region,Liaodong Peninsula,NE *** ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)zircon U-Pb data indicate that these granitoids were emplaced at 165-156 *** biotite monzogranite,two-mica monzogranite,monzogranite,granodiorite,biotite granodiorite,and syenogranite are strongly peraluminous(A/CNK=1.09-1.29),contain peraluminous minerals such as muscovite,have high normative corundum abundances(1.26 wt.%-3.28 wt.%),and have high K2_(O)/Na2O ratios(0.76-1.48),all of which indicate an S-type granite ***,the biotite granodiorite and syenogranite have high Sr(391 ppm-570 ppm)and low Y(3.06 ppm-5.94 ppm)contents,with high Sr/Y(65.8-185.9)ratios,and the two-mica monzogranite,monzogranite,and granodiorite have relatively high Sr(138 ppm-379 ppm)and low Y(3.38 ppm-8.71 ppm)contents,with high Sr/Y ratios(19.1-77.9).All of the analyzed samples have negative zircon eHf(t)values(-41.4 to-20.6)with old two-stage Hf model ages(TDM2(Hf)=2.50-3.76 Ga).Therefore,we infer that the biotite monzogranite is the typical feature of S-type granite that was derived by partial melting of *** monzogranite,two-mica monzogranite,granodiorite,biotite granodiorite,and syenogranite exhibit geochemical characteristics of S-type granite with K-rich adakitic features,and were possibly derived by mixing of melts from clastic crustal materials and ada-kitic *** are voluminous Jurassic igneous rocks in the NE *** combining our study with the previous researches,this paper infers that the Jurassic magmatism within the Erguna-Xing'an Massif was related to the southward subduction and closure of the Mongol-Okhotsk Ocean;the Early Jurassic magmatism to the east of the Songliao Basin and in the northern North

关键词： Mongol-Okhotsk Ocean Pacific Plate S-type granites adakites Northeast China

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Eocene Crustal Thickening and Uplifting of the Tibetan Plateau:Evidence from Adakitic Volcanic Rocks

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地学前缘 2009年第S1期16卷 274-274页

作者： Derek A.Wyman School of Geosciences Division of Geology and GeophysicsThe University of Sydney

Changes in oceanic O-Sr-C isotopic compositions, global cooling and Asian continental aridification beginning in the Middle-Late Eocene(47-34 Ma) are considered to have been caused by the uplift of the Tibetan *** specific timing and uplift mechanism,however,have long been subjects of *** investigated the Duogecuoren lavas of the central-western Qiangtang block,which form the largest outcrops among Cenozoic lavas in north-

关键词： adakites high-Mg andesites subduction uplift Eocene icehouse Tibet

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