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中国矿物岩石地球化学学会第九次全国会员代表大会暨第16届学术年会

作者：陈能松王连顺 Hassan M.A.Mustafa 马昌前 mushaal abdelgadir salih 中国地质大学(武汉)地球科学学院 University of Kordofan

苏丹是"一带一路"中的"21世纪海上丝绸之路"的沿路国家之一。苏丹大陆构成了西冈瓦纳和阿拉伯-努必亚地盾的重要组成部分,曾经历了Rodinia超大陆和冈瓦纳大陆的形成与裂解过程,其构造单元目前倾向于划分为4个:前新元古代地壳单元、新元... 详细信息

苏丹是"一带一路"中的"21世纪海上丝绸之路"的沿路国家之一。苏丹大陆构成了西冈瓦纳和阿拉伯-努必亚地盾的重要组成部分,曾经历了Rodinia超大陆和冈瓦纳大陆的形成与裂解过程,其构造单元目前倾向于划分为4个:前新元古代地壳单元、新元古代变形改造的前新元古代地壳单元、新元古代地壳单元以及盖层。前新元古代单元保存着Rodinia超大陆汇聚与裂解的热构造事件痕迹,新元

关键词：角闪岩锆石年龄岩浆作用构造划分

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Geochemistry of Metamafic Dykes from the Quanji Massif: Petrogenesis and Further Evidence for Oceanic Subduction, Late Paleoproterozoic, NW China

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Journal of Earth Science 2016年第4期27卷 529-544页

作者： Hassan Abdelslam Mustafa Qinyan Wang Nengsong Chen Fanxi Liao Min Sun Meshaal abdelgadir salih Faculty of Earth Sciences China University of Geosciences Faculty of Science University of Kordofan Center for Global Tectonics China University of GeosciencesWuhan State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Department of Earth Sciences The University of Hong Kong

A suite of ~1.84-1.92 Ga metamafic dykes within the paragneiss suite（khondalite） of the Quanji massif in NW China, has been chosen in this study for further understanding the tectonic evolution and possible links to the global Columbia supercontinent. Occurrence and field relations suggest that they were formed coevally with a previous studied ~1.83-1.85 Ga metamafic dyke swarms. Whole-rock major and trace elemental geochemistry suggests precursor magma of the amphibolites being generated from a volcanic arc-related tectonic setting rather than a back-arc environment where the metamafic dyke swarms were emplaced. The metamafic dykes show enrichment of LREE and strongly negative anomalies for Ta-Nb, Zr-Hf and Ti, have high SiO_2（49.3 wt.%-52.5 wt.%） but low MgO（6.40 wt.%-7.76 wt.%） contents and Mg~#（Mg~#=[100×（MgO/40.3）]/[MgO/40.3＋FeO/71.8]） values（45.7-52.1）, suggesting evolved precursor magma. The high values of La/Ta（22.2-42.8） and La/Nb（1.71-2.47）, mildly negative εNd（t） values（-2.51-0.15）, with depleted mantle model ages（TDM） of 2.45-2.84 Ga, suggest that their precursor magmas were possibly derived from a subduction-related fluid metasomatized Archean sub-continental lithospheric mantle. This study provides further evidence for oceanic plate subduction prevailing before or around ~1.85 Ga, which confirms a prolonged subduction-accretion-collision history in the NW China which is possibly linked to the assembly of the Columbia supercontinent.

关键词： metamafic dyke geochemistry petrogenesis tectonic setting Quanji massif NW China.

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Early Paleoproterozoic Post-Collisional Basaltic Magmatism in Quanji Massif:Implications for Precambrian Plate Tectonic Regime in NW China

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Journal of Earth Science 2022年第3期33卷 706-718页

作者： Hassan Abdelslam Mustafa Fanxi Liao Nengsong Chen Zhendong You Meshaal abdelgadir salih Lu Wang Lu Zhang School of Earth Sciences China University of GeosciencesWuhan 430074China Faculty of Science University of KordofanEL ObeidP.O.160Sudan International Research Center for Geology and Resources along the Silk Roads China University of GeosciencesWuhan 430074China College of Earth Sciences University of Science and Technology of ChengduChengdu 610059China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

Basaltic magmas can provide important information about mantle source nature,tectonic settings and tectonic evolution for a given *** paper reports geology,petrography and geochemistry of whole-rock major and trace elements and Nd-Sr isotopes for a suite of garnet amphibolites from southeastern Wulan(Ulan),Quanji Massif,northwestern *** garnet amphibolites were likely generated from basaltic lavas,associated with both paragneisses and orthogneisses of the lower Delingha *** basaltic protolith of these amphibolites can be broadly constrained to be formed at~2.33 Ga in an extensional setting *** geochemistry of amphibolites shows subalkaline and highly evolved *** display high-Fe low-Ti characteristics,with TFeO of 13.1 wt.%-17.9 wt.%and TiO_(2) of 1.42 wt.%-3.09 wt.%(in most samples TiO_(2)≤2.5 wt.%).The chondrite-normalized REE patterns show enrichment of LREE and LILE and the primitive-mantle-normalized incompatible element patterns display negative P,Ti,Nb-Ta and Zr-Hf ***(^(87)Sr/^(86)Sr)t values of 0.6978-0.7123 andε_(Nd)(t)values of-2.81-5.08 respond to depleted mantle model ages(T_(DM))of 2.33-3.30 *** suggest that the precursor magmas of the protolith of the garnet amphibolites were probably derived from the Early Paleoproterozoic depleted sub-continental lithospheric mantle that had been metasomatized by subduction-induced fluids and *** precursor basaltic magmas were contaminated by the older crustal components during magma *** post-collisional basaltic magmatic event at~2.33 Ga in Quanji Massif thus enhanced the subduction shutdown or slowdown tectonic regime both in NW China and coevally with those plate tectonics in some important domains worldwide during the Early Paleoproterozoic.

关键词： amphibolite geochemistry NW China post-collisional magmatism Precambrian tectonic evolution

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