大别造山带新太古代地壳岩石和古元古代混合岩化作用——来自锆石U-Pb年代学和Hf同位素证据
发布时间:2022-01-20 02:49
大别造山带北大别超高压变质带是研究秦岭-大别-苏鲁造山带古老基底演化过程的关键区域,其内广泛发育的混合岩长期被认为主要形成于中生代。本文对北大别团风一带新识别出的一套混合岩开展了锆石U-Pb定年和Hf同位素组成分析,结果显示,混合岩第一类锆石核部具有岩浆锆石特点,组成的不一致线上交点年龄为2850±86 Ma,该年龄代表了混合岩原岩年龄。第二类锆石具有变质深熔锆石特点,其加权平均207Pb/206Pb年龄为2011±12 Ma,代表了混合岩化的时间。岩浆锆石多数具有负的εHf(t)值(—8.1~2.2),对应两阶段Hf同位素模式年龄(TDM2)为3.6~3.0 Ga,表明原岩可能为大别造山带内古太古代地壳物质重熔形成,并可能在形成过程中伴有少量幔源物质加入。与之相比,变质锆石均具有正的εHf(t)值(0.3~8.2),对应TDM2为2.7~2.2 Ga,说明在混合岩化变质深熔过程中锆石Lu-Hf同位素体系完全开放,导致了锆石Hf同位素组成的升高。本文研究表...
【文章来源】:地质学报. 2020,94(03)北大核心EICSCD
【文章页数】:10 页
【部分图文】:
图5北大别团风混合岩锆石U-Pb年龄与e]Hf(〇关系图??(腔岭杂岩数据来自?Qiu?Xiaofei?et?al.,2014;?Li?et?al.,??2014;?Guo?et?al.,2015)??
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本文编号:3598031
【文章来源】:地质学报. 2020,94(03)北大核心EICSCD
【文章页数】:10 页
【部分图文】:
图5北大别团风混合岩锆石U-Pb年龄与e]Hf(〇关系图??(腔岭杂岩数据来自?Qiu?Xiaofei?et?al.,2014;?Li?et?al.,??2014;?Guo?et?al.,2015)??
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[2]北大别混合岩类型及其成因[J]. 陈永康,闫峻,刘晓强,张媛媛,李全忠. 矿物岩石. 2017(02)
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[6]大别山岳西县石关混合岩锆石SHRIMP定年及其地质意义[J]. 夏斌,蔡周荣,张玉泉,钟立峰,吴维平,王洪,刘立文,杨之青,董春艳. 地质学报. 2010(02)
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本文编号:3598031
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