皖南中生代早期成矿和晚期非成矿花岗岩成因对比
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  • 英文篇名:Petrogenetic contrastive studies on the Mesozoic early stage ore-bearing and late stage ore-barren granites from the southern Anhui Province
  • 作者:闫峻 ; 后田结 ; 王爱国 ; 王德恩 ; 张定源 ; 翁望飞 ; 刘建敏 ; 刘晓强 ; 李全忠
  • 英文作者:Yan J;Hou T J;Wang A G;Wang D E;Zhang D Y;Weng W F;Liu J M;Liu X Q;Li Q Z;
  • 关键词:燕山期 ; 花岗岩 ; 下地壳 ; 成矿岩浆岩 ; 皖南 ; 江南造山带
  • 中文刊名:JDXK
  • 英文刊名:Scientia Sinica(Terrae)
  • 机构:合肥工业大学资源与环境工程学院;中国地质调查局南京地质调查中心;安徽省地质矿产勘查局332地质队;
  • 出版日期:2017-11-20
  • 出版单位:中国科学:地球科学
  • 年:2017
  • 期:v.47
  • 基金:国家重点研发计划项目(编号:2016YFC0600203);; 国家自然科学基金项目(批准号:41672052、41272074)资助
  • 语种:中文;
  • 页:JDXK201711002
  • 页数:23
  • CN:11
  • ISSN:11-5842/P
  • 分类号:17-39
摘要
皖南地区燕山期岩浆作用强烈,可划分为早阶段(152~137Ma)和晚阶段(136~122Ma).野外调查发现,屯溪地区沿青山-长陔发育一条燕山期花岗岩带,与钼多金属矿床具有密切的成因关系.黄山岩体是皖南地区代表性的正长花岗岩体,目前尚未发现与成矿有关.锆石LA-ICP-MS定年结果表明,青山-长陔带4个花岗岩体的形成时代一致,介于(140±4)~(141±2)Ma,属于燕山期早阶段岩浆作用.黄山花岗岩体的形成时代为(129±2)Ma,属于晚阶段岩浆作用,青山-长陔带花岗岩具有较高的SiO_2含量,相对富K_2O、低P_2O_5以及中等程度的Al_2O_3含量,属于高钾钙碱性系列准铝质Ⅰ型花岗岩.这些岩石均表现出富集大离子亲石元素和轻稀土元素,亏损高场强元素,中等程度的Eu负异常,为岛弧或大陆壳源岩浆地球化学特征.样品的~(87)Sr/~(86)Sr(t)介于0.7120~0.7125,ε_(Nd)(t)值为-7.24~-4.38,锆石ε_(Hf)(t)值为-4.4~6.7,类似于同时期皖南成矿花岗闪长岩.综合地球化学研究表明,皖南燕山期成矿花岗闪长岩为中-新元古代增生加厚下地壳部分熔融的产物,而青山-长陔带花岗岩为这种岩浆经过斜长石+角闪石+上溪群的结晶分异同化混染(AFC)过程形成.黄山花岗岩富SiO_2和K_2O,Al_2O_3含量中等,具有海鸥式稀土元素配分型式和显著的Eu负异常.相比青山-长陔带花岗岩,黄山岩体具有更加显著的Ba、Sr、P和Ti的负异常,没有Nb和Ta的亏损,为高钾钙碱性准铝质A型花岗岩,其ε_(Hf)(t)值介于-6.6~-1.2,类似于早阶段成矿花岗闪长岩.黄山花岗岩同样起源于中-新元古代增生地壳的深熔作用,但岩浆源区为经过了燕山期早阶段Ⅰ型中酸性岩浆抽取后的残留麻粒岩质地壳.两期花岗岩的比较研究表明,早阶段花岗岩形成于相对厚的下地壳环境,温度较低,源区为中-新元古代增生地壳,富含成矿物质,岩浆AFC演化过程进一步加强了成矿物质的富集;而晚阶段A型花岗岩起源深度较浅,形成温度更高,源区由于早期的岩浆抽取作用而亏损成矿物质,从而成矿能力较弱,指示从早至晚,岩浆作用阶段从后造山转变为非造山.后者对应着古太平洋板块俯冲角度加大背景下的弧后拉张环境.
        
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