大兴安岭南段东麓中生代O型埃达克质火山岩及其成因、古构造环境和找矿意义

张永北 孙世华 毛骞. 大兴安岭南段东麓中生代O型埃达克质火山岩及其成因、古构造环境和找矿意义[J]. 岩石学报, 2006, 22(9): 2289-2304.
引用本文: 张永北 孙世华 毛骞. 大兴安岭南段东麓中生代O型埃达克质火山岩及其成因、古构造环境和找矿意义[J]. 岩石学报, 2006, 22(9): 2289-2304.
Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China.[J]. Acta Petrologica Sinica, 2006, 22(9): 2289-2304.
Citation: Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China.[J]. Acta Petrologica Sinica, 2006, 22(9): 2289-2304.

大兴安岭南段东麓中生代O型埃达克质火山岩及其成因、古构造环境和找矿意义

  • 基金项目:

    国家重点基础研究发展规划项目(2003CB716506)与中国地质大学(武汉)(40472037)和北京大学(40372103)自然科学基金项目.致谢审稿人张旗老师为本文提出了宝贵的修改意见.在此表示衷心感谢!

Mesozoic O-type adakitic volcanic rocks and its petrogenesis, paleo-tectonic dynamic and mineralization significance of the eastern side of sourthern Da Hinggan, China.

  • 蒙东西拉木伦河北侧查干木伦河流域,属中生代大兴安岭火山-侵入杂岩带南段.最近区内晚侏罗世满克头鄂博组陆相火山杂岩火山盾中,发现有埃达克质火山岩,与少量钠质流纹岩和玄武岩共生.埃达克岩Al2O3>15%,MgO<3.4%,K2O平均=1.77%,Na2O/K2 O>1,LREE富集,HREE及LIRE强烈亏损,无负铕异常,高Sr(497.91~896.40×10-6),低Y(4.33~15.77<18×10-6),低Yb(0.35~1.54<1.9×10-6),ISr=0.70374~0.70594,εNd(t)为-0.45~+6.58,在K-Na-Ca、Rb-Sr-Ba、Sr/Y-Y和Sr/Yb-Yb等图中属埃达克岩,具奥长花岗岩演化趋势,是典型的O型埃达克岩.其与共生岩石εNd(t)、ISr与晚古生代玄武岩的接近,部分岩石tDM(677~845Ma)与晚古生代俯冲洋壳(tDM=627~998Ma)相同,Sr-Nd同位素及Zr/Hf-Nb/Ta比值具有亏损地幔与下地壳混合特征,另有岩石(tDM=343~453Ma)源于古生代年轻地幔.据此推论其源岩是以晚元古代俯冲洋壳为主,多源物质混合的增生地体下地壳.LaN/YbN-YbN及La/Sm-La图证明埃达质岩浆是榴辉岩化源岩部分熔融的原始岩浆,钠质流纹岩是该原始岩浆分离结晶产物,玄武岩浆则可能是源岩深度熔融的结果.岩石成分及微量元素判别该火山活动环境是大陆边缘弧.大兴安岭地区在中生代出现埃达克质火山岩及该类火山弧,未必与环太平洋或者鄂霍茨克海俯冲构造直接相关,而是晚古生代古亚洲洋残存洋壳在中生代沿续存俯冲断裂继续向增生地体下地壳俯冲并发生部分熔融结果.区内与满克头鄂博组有关的铁、铜、金矿化,应有大矿前景.
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收稿日期:  2005-12-06
修回日期:  2006-09-10
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