| 孙志远,龙灵利,王玉往,杜杨松,赵路通,解洪晶,李德东.新疆景峡铜矿区火山岩地球化学特征与构造环境探讨[J].矿产勘查,2016,7(1):53-64 |
| 新疆景峡铜矿区火山岩地球化学特征与构造环境探讨 |
| Geochemical characteristics and tectonic setting of the volcanic rocks in Jingxia copper deposit,Xinjiang |
| 投稿时间：2015-09-07 |
| DOI： |
| 中文关键词: 新疆 东天山 景峡 早石炭世 火山岩 地球化学 |
| 英文关键词: volcanic rocks, early Carboniferous, geochemistry, Jingxia, eastern Tianshan, Xinjiang |
| 基金项目:国家重点基础发展研究计划项目(编号:2014CB440803)、中国地质调查局老矿山项目(编号:12120113086300)和国家自然科学基金(编号:41202064)联合资助。 |
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| 中文摘要: |
| 景峡铜矿区位于东天山觉罗塔格构造带南缘阿奇山—雅满苏岛弧带内,矿区主要发育下石炭统阿奇山组火山岩。火山岩以基性、中—基性的玄武岩、玄武质粗面安山岩、安山岩为主,夹少量英安斑岩和火山凝灰岩；岩石以高铝(A/CNK=1.09~2.09,平均1.60)、富钠(Na2O/K2O=0.43~53.63,平均10.49)为特征；包含了CAB和IAT两种类型岩石系列；稀土元素整体上呈现轻稀土相对富集、重稀土相对亏损的右倾型稀土配分模式,富集Th、U、La、Ce等大离子亲石元素(LILE)和亏损Nb、Ta、Ti高场强元素(HFSE)的特点,表明火山岩原始岩浆在演化过程中受到俯冲带中的流体的交代作用,显示出岛弧岩浆岩的特点。 |
| 英文摘要: |
| The Jingxia copper deposit is located in the northern Jueluotage tectonic belt,eastern Tianshan mountain. The early Carboniferous volcanic rocks consisting of basic - intermediate basalt, basaltic trachy andesite, andesite with minor dacite porphyry and volcanic tuffs,widely outcropped in this area. Volcanic rocks are characterized with high Al2O3 content (A/CNK=1.09-2.09,average 1.60) and rich Na2O (Na2O/K2O = 0.43-53.63), include CAB and IAT rock series.They are enriched in LREE relatively to HREE. The primordialmantal-normalized trace element patterns are characterized by LILE (Th, U, La and Ce) enrichment and HFSE depletion (Nb, Ta and Ti). The geochemical characteristics indicates that the parent magma of these volcanic rocks was metasomatized by fluids derived from subduction zone during the evolution of magma and therefore, they have characteristics of island arc magmatic rocks. |
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