华北板块北缘中段早石炭世构造属性:察哈尔右翼后旗高分异Ⅰ型花岗岩地球化学的制约

doi:10.13278/j.cnki.jjuese.201504115

Abstract

Abstract:

This study focuses on the petrology and geochemistry of the monzonitic granites from the Cahayouhouqi area in Inner Mongolia. Tectonically it is located in the central-northern margin of the North China craton. These rocks have high content of silica, kalium and alkalis, low abundance of calcium, phosphorus, iron, magnesium; w(P₂O₅) decreases with the increasing of w(SiO₂); A/CNK equals 0.96-1.15; and differentiation index DI is between 90.36-92.96. The granites consist mainly of perthite, plagioclase, quartz, minor biotite, no mafic alkaline minerals and Al-rich minerals; their accessory minerals are zircon, magnetite, apatite, sphene and ilmenite. Combined with the petrological and geochemical characteristics, the granites can be classified as a highly fractionated I-type granite. The low content of ∑REE ((46.8-94.4)×10^-6), Th ((1.74-2.39)×10^-6), and U ((0.27-0.39)×10^-6), as well as their trace element discrimination diagrams indicate that the magma source derived from the lower crust, and their source-rock was lithosphere mantle. The chondrite normalized patterns are right declined with a serious positive Eu anomaly (δEu=0.83-3.51). They are enriched in the large ion lithophile elements (LILEs, e.g., Cs, Rb, Ba, and K), and depleted of the high field-strength elements (HFSEs, e.g., Nb, Ta, P, and Ti). Their geochemical characteristics indicates that the monzonitic granites emplaced in an active continental margin as a result of the Early Carboniferous subduction of Paleo-Asian Ocean towards the northern margin of the North China craton.

Key words: northern margin North China craton, Inner Mongolia, Early Carboniferous, highly fractionated I-type granites, active continental margin arc, Paleo-Asian Ocean

CLC Number:

P588.12

Liu Qun, Wang Wanqiong, Qiu Dianming, Bai Xinhui, Zhang Jinfeng, Wang Xin. Early Carboniferous Tectonic Attribute of the Central-Northern Margin of North China Craton: Constraints from Geochemistry of Highly Fractionated Ⅰ-Type Granites in Cahayouhouqi Area[J].Journal of Jilin University(Earth Science Edition), 2015, 45(4): 1121-1131.

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Early Carboniferous Tectonic Attribute of the Central-Northern Margin of North China Craton: Constraints from Geochemistry of Highly Fractionated Ⅰ-Type Granites in Cahayouhouqi Area

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