[an error occurred while processing this directive] 高校地质学报 2013, 19(1) 123- DOI:      ISSN: 1006-7493 CN: 32-1440/P

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本文关键词相关文章
锆石LA-ICP-MS U-Pb定年
Hf同位素组成
后碰撞
华北板块北缘
本文作者相关文章
PubMed
白云鄂博中二叠世巴音珠日和岩体地球化学特征及构造意义
罗红玲,吴泰然,赵 磊,贺元凯,荆 旭
摘要

白云鄂博巴音珠日和岩体位于华北板块北缘中段的东升庙—太仆寺旗岩浆岩带上。该岩体由角闪辉长岩和石英闪长
岩组成,其地球化学性质显示:低硅高铝,SiO2=49.72%~59.34%,Al2O3=15.79%~19.50%,Mg#=38~44 ;大离子亲石元素
(LILE)富集(如Ba=829×10-6~1104×10-6,Sr=502×10-6~726×10-6)、高场强元素(HFSE,Nb,Ta等)亏损、轻稀土(LREE)富集(La/Yb)N=5.0~11.4,多数样品为弱负铕异常(δEu=0.63~1.09);低Sr/Nd(12~24)和La/Nb(1.33~2.39)比值显示了板内岩浆作用特征。两个角闪辉长岩的高Nb/Th (9.6~18.4)比值显示了非弧玄武质岩浆特征。岩体的锆石LA-ICP-MS U-Pb年龄为(265±2) Ma,代表岩体侵位年龄。锆石εHf(t )=-13.0~-17.2、t DMC=2.12~2.38 Ga,显示了较明显的下地壳基底组
分的加入。巴音珠日和岩体可能为后碰撞背景下,地壳的伸展减薄造成基性下地壳的部分熔融,熔体与来自富集地幔的玄
武质岩浆发生部分混合,随后经进一步分异结晶作用形成。

关键词 锆石LA-ICP-MS U-Pb定年   Hf同位素组成   后碰撞   华北板块北缘  
Geochemical characteristics of Bayinzhurihe pluton and its tectonic significance, Bayan Obo, Inner Mongolia
LUO Hongling, WU Tairan, ZHAO Lei, HE Yuankai, JIN Xu 
Abstract:

The middle segment of northern margin of the North China Plate was influenced by intense tectonic and magmatic
activity during the Permian. Dozens of intrusions formed an E-W trending magmatic belt that extended from the Dongshenmiao to
Xianghuang Qi, Inner Mongolia, with a length of 400 km and width of 30 km. As a representative, Bayinzhurihe Pluton consists
of quartz diorite and hornblende gabbro, which belong to high-potassium calc-alkaline series. They are characterized by low SiO2
(49.72%~59.34%) and high Al2O3 (15.79%~19.50%) contents, with Mg#=38~44, enrichment in large ion lithophile elements
(LILE, e.g., Ba=829×10-6~1104×10-6, Sr=502×10-6~726×10-6), relative depletion in high field strength elements (HFSE, e.g.,
Nb, Ta) in primitive mantle-normalized spidergrams, and right-inclined rare earth element patterns, mostly with slightly negative
Eu anomalies (δEu=0.63~1.09). Their low Sr/Nd ratios (12~24) and La/Nb ratios (1.33~2.39) may reflect intraplate magmatism
involved. Hornblende gabbro shows non-arc-like (Nb/Th =9.6-18.4) basalt affinity compositions. LA-ICP-MS U-Pb zircon
dating of the Pluton yielded an intrusive age of 265±2Ma. Its zircons have εHf(t )= -13.0~-17.2 and t DM
C=2.12~2.38 Ga, mainly show the characteristics of lower continental crust. These features lead us to conclude that Bayinzhurihe Pluton was generated bymixing of lower crustal-derived mafic melt and minor enriched mantle-derived mafic magma, followed by fractional crystallization,due to crustal extension in post-collisional setting.

Keywords: zircon LA-ICP-MS U-Pb dating   Hf isotopic compositions   post-collision   northern margin of the North China Plate  
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