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Geochemical and Nd-Hf Isotopic Constraints on the Petrogenesis of an Archean Granitoid in the Erguna Massif, NE China
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14645 Jun SHAO 1 , Yinglei LI 2, 3 , Deli WANG 4 , Wanbing SONG 5 , Xinwei XU 1 , Hongzhang LIU 6
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14645 Jun SHAO 1 , Yinglei LI 2, 3 , Deli WANG 4 , Wanbing SONG 5 , Xinwei XU 1 , Hongzhang LIU 6
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Crystalline basement and Precambrian crustal growth of the continental massifs within the Central Asian Orogenic Belt (CAOB) are still pending problems. Our geological and geochemical investigations identified an Archean (2606 Ma) granitic pluton in the Biliya area of the Erguna Massif. The Neoarchean granitoids show high and positive in-situ zircon ∊Hf(t) (+0.3 to +10.0), whole-rock ∊Nd(t) (+4.8) and whole-rock ∊Hf(t) values (+2.1). They are characterized by high Y + Ce + Zr + Nb (> 220 ppm) and Zr contents and could be classified as A-type granites. These granitoids are characterized by high Zr saturation temperatures (TZr) (796–836°C). They were derived from partial re-melting of juvenile mafic lower crust in an intracontinental back-arc extensional environment. This newly identified Neoarchean granitic pluton may represent the crystalline basement of the several continent massifs within the CAOB, and their high ∊Hf(t)–∊Nd(t) values may also indicate the occurrence of lateral crustal growth events in these massifs during the Neoarchean.
中文翻译：
额尔古纳地块太古宙花岗岩成因的地球化学和 Nd-Hf 同位素约束
中亚造山带（CAOB）内陆块的结晶基底和前寒武纪地壳生长仍是悬而未决的问题。我们的地质和地球化学调查在额尔古纳地块的比利亚地区发现了一个太古宙（2606 Ma）花岗岩体。新太古代花岗岩显示高正原位锆石∊ Hf ( t ) (+0.3 to +10.0), 全岩∊ Nd ( t ) (+4.8) 和全岩∊ Hf ( t ) 值 (+2.1) . 它们的特点是 Y + Ce + Zr + Nb (> 220 ppm) 和 Zr 含量高，可归类为 A 型花岗岩。这些花岗岩的特点是高 Zr 饱和温度（TZr ) (796–836°C)。它们来源于陆内弧后伸展环境中幼年镁铁质下地壳的部分重熔。这个新发现的新太古代花岗质岩体可能代表了CAOB内几个大陆地块的结晶基底，它们的高∊ Hf ( t )– ∊ Nd ( t ) 值也可能表明在这些地块中发生了横向地壳生长事件。新太古代。
更新日期：2021-01-08
中文翻译：
额尔古纳地块太古宙花岗岩成因的地球化学和 Nd-Hf 同位素约束
中亚造山带（CAOB）内陆块的结晶基底和前寒武纪地壳生长仍是悬而未决的问题。我们的地质和地球化学调查在额尔古纳地块的比利亚地区发现了一个太古宙（2606 Ma）花岗岩体。新太古代花岗岩显示高正原位锆石∊ Hf ( t ) (+0.3 to +10.0), 全岩∊ Nd ( t ) (+4.8) 和全岩∊ Hf ( t ) 值 (+2.1) . 它们的特点是 Y + Ce + Zr + Nb (> 220 ppm) 和 Zr 含量高，可归类为 A 型花岗岩。这些花岗岩的特点是高 Zr 饱和温度（TZr ) (796–836°C)。它们来源于陆内弧后伸展环境中幼年镁铁质下地壳的部分重熔。这个新发现的新太古代花岗质岩体可能代表了CAOB内几个大陆地块的结晶基底，它们的高∊ Hf ( t )– ∊ Nd ( t ) 值也可能表明在这些地块中发生了横向地壳生长事件。新太古代。
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