苏鲁造山带碱性岩的成因研究------主微量元素地球化学证据
Petrogenesis of Alkaline Rocks in the Sulu Orogen-Evidence from Elemental Geochemistry
查看参考文献51篇
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文摘
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苏鲁造山带碱性岩总体具有高SiO2(60.2% ~65.1% )、高钾(K2O=4.66% ~5.79%, K2O/Na2O>1)、富碱(Na_2O+K_2O=8.30% ~10.1% )和过铝质(Al_2O_3=14.5% ~16.7%, A/KNC=0.92~1.10)的特征. 在微量元素蛛网图上, 样品表现出富集大离子亲石元素(Rb、Ba、K)、Th和U及亏损高场强元素(Nb、Ta、Zr、Hf、Ti、P)的特点. 研究区碱性岩具有较高的稀土总量(ΣREE=296×10~(-6)~868×10~(-6)), 球粒陨石标准化配分曲线呈平行分布, 轻重稀土分异明显(右倾型), 具有中等-弱的负Eu异常(δEu=0.46~0.78). 元素地球化学特征表明, 苏鲁造山带碱性岩为富集岩石圈地幔部分熔融的产物, 但在成岩过程中可能经历了单斜辉石、斜长石、磷灰石、Ti-Fe氧化物、角闪石和黑云母等矿物的分离结晶作用, 锆石饱和温度计算表明岩浆的结晶温度范围为830 ~924℃. 苏鲁造山带碱性岩形成于岩石圈拉张减薄的构造环境, 岩浆在上升侵位过程中没有明显受到地壳物质的混染. |
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其他语种文摘
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We reported the major and trace elements of alkaline rocks from the Sulu orogenic belt. The rocks belong to peraluminous series ( Al_2O_3 = 14. 5% ~ 16. 7%, A/KNC = 0. 92 ~ 1. 10), and are characterized by high SiO_2 (60. 2%-65. 1%) and K_2O contents (4. 66%% -5.79%, K_2O/Na_2O > 1). Moreover, the alkaline rocks are characterized by enrichment in Th, U, Rb, Ba and K, depletion in Nb, Ta, Zr, Hf, Ti and P, strong fractionation of LREE and HREE [(La/Yb)_N = 15. 0 ~ 47. 3], as well as moderate negative Eu anomalies ( Eu = 0. 46 ~ 0. 78) Based on the above geochemical features, we propose that these alkaline rocks were derived from partial melting of the enriched lithospheric mantle in the extensional tectonic setting. Meanwhile, the parental magma underwent intense mineral fractional crystallization, including clinopyroxene, plagioclase, apatite, horrnblende and biotite, whereas there had no crustal contamination during magma ascent Simulative calculation for zircon saturation temperatures (T_(Zr)) indicated that the alkaline rocks crystallized between 830 ℃ and 924 ℃. |
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来源
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矿物学报
,2010,30(2):194-206 【核心库】
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关键词
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碱性岩
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元素地球化学
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岩石成因
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苏鲁造山带
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地址
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1.
中国科学院研究生院, 矿床地球化学国家重点实验室, 北京, 100049
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室;;大陆动力学国家重点实验室, 贵州, 贵阳, 550002
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金
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西北大学大陆动力学国家重点实验室基金
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:3914305
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