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

摘要/Abstract

摘要：

察哈尔右翼后旗二长花岗岩岩体位于华北板块北缘中段.岩体富SiO₂、富K、富碱、低Ca和P、贫Fe和Mg,w(P₂O₅)与w(SiO₂)呈负相关,铝指数(A/CNK)为0.96~1.15,分异指数为90.36~92.96;主要造岩矿物为条纹长石、斜长石和石英,其铁镁矿物主要为黑云母,未出现碱性铁镁矿物和富铝矿物,副矿物为锆石、磁铁矿、磷灰石、榍石和钛铁矿;可见察哈尔右翼后旗二长花岗岩属高分异钙碱性I型花岗岩类.结合较低的w(∑REE)((46.8~94.4)×10^-6)、w(Th)((1.74~2.39)×10^-6)、w(U)((0.27~0.39)×10^-6)和微量元素判别图解,二长花岗岩岩浆源区可能为下地壳,源岩可能为岩石圈地幔.岩石轻重稀土分馏较强 ((La/Yb)_N= 6.52~28.39),δEu以正异常为主(0.83~3.51),富集大离子亲石元素(LILEs,Cs、Rb、Ba和K),亏损高场强元素 (HFSEs,Nb、Ta、P和Ti).地球化学特征反映了二长花岗岩具有火山弧岩石特征,且岩体侵入新元古界埃迪卡拉系什那干群,表明岩体形成于活动大陆边缘弧环境,其侵位反映了古亚洲洋的俯冲岩浆事件.

关键词: 华北板块北缘, 内蒙古, 早石炭世, 高分异I型花岗岩, 活动大陆边缘弧, 古亚洲洋

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

中图分类号:

P588.12

刘群, 王挽琼, 邱殿明, 白新会, 张金凤, 王新. 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[J]. 吉林大学学报(地球科学版), 2015, 45(4): 1121-1131.

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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