东天山卡拉塔格钠质火山岩岩石学、地球化学及成因

唐俊华[1,2] 顾连兴 郑远川 方同辉 张遵忠 高军辉 王福田 汪传胜 张光辉. 东天山卡拉塔格钠质火山岩岩石学、地球化学及成因[J]. 岩石学报, 2006, 22(5): 1150-1166.
引用本文: 唐俊华[1,2] 顾连兴 郑远川 方同辉 张遵忠 高军辉 王福田 汪传胜 张光辉. 东天山卡拉塔格钠质火山岩岩石学、地球化学及成因[J]. 岩石学报, 2006, 22(5): 1150-1166.
TANG JunHua, GU LianXing, ZHENG YuanChuan, FANG TongHui, ZHANG ZunZhong, GAO JunHui, WANG FuTian, WANG ChuanSheng and ZHANG GuangHui. Petrology, geochemistry and genesis of the Na-rich volcanic rocks of the Kalatag area, eastern Tianshan.[J]. Acta Petrologica Sinica, 2006, 22(5): 1150-1166.
Citation: TANG JunHua, GU LianXing, ZHENG YuanChuan, FANG TongHui, ZHANG ZunZhong, GAO JunHui, WANG FuTian, WANG ChuanSheng and ZHANG GuangHui. Petrology, geochemistry and genesis of the Na-rich volcanic rocks of the Kalatag area, eastern Tianshan.[J]. Acta Petrologica Sinica, 2006, 22(5): 1150-1166.

东天山卡拉塔格钠质火山岩岩石学、地球化学及成因

  • 基金项目:

    本文为国家重点基础研究发展规划项目(2001CB409802)和国家自然科学基金项目(No.40472042)成果.致谢 周新民教授多次对作者的研究工作进行指导.两位匿名审稿人仔细地审阅了本文初稿,并提出了建设性的修改意见.作者等在此致以衷心的感谢.

Petrology, geochemistry and genesis of the Na-rich volcanic rocks of the Kalatag area, eastern Tianshan.

  • 东天山卡拉塔格早泥盆世卡拉塔格组火山岩主要岩性为海相富钠质的安山岩、流纹岩和英安岩,夹少量的钠质玄武安山岩和钠质玄武岩以及正常系列的玄武安山岩。钠质火山岩的特征是:Na2O=1.69~6.38%,Na2O/K,O〉1,多在2~100间:无论是斑晶还是基质,斜长石均为富钠长石;酸性岩石斑晶主要是钠长石和石英,中基性岩石斑晶主要是钠长石(少量更长石):酸性岩以斑状结构、霏细结构、球粒结构为主,而中基性岩以交织结构、玻晶交织结构为主。各类岩石全岩化学分析计算结果均含标准矿物Q、Hy、Hm,一部分含Di或C,在TAS图上全都投于亚碱性区;∑REE=25、96-96.11ppm,LaN/YbN=1.68-5.32,Eu/E^*=0.46-1.25,LaN/SmN=1.01-2.95;强不相容元素适度富集,Nb和Ta强烈亏损,部分样品Cs、Rb、K、Zr和Hf适度亏损。这些特征表明,该区钠质火山岩的原始岩浆可能来自富钠俯冲洋壳熔体与地幔楔岩石反应的产物部分熔融。这样的岩浆形成机制与前人有关卡拉塔格是早泥盆世岛弧的认识相一致。
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收稿日期:  2006-02-20
修回日期:  2006-04-01
刊出日期:  2006-05-31

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