Geochronology, petrogenesis and tectonic settings of pre- and syn-ore granites from the W-Mo deposits (East Kounrad, Zhanet and Akshatau), Central Kazakhstan
Geochronology, petrogenesis and tectonic settings of pre- and syn-ore granites from the W-Mo deposits (East Kounrad, Zhanet and Akshatau), Central Kazakhstan
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哈萨克斯坦中部 W-Mo 矿床（东 Kounrad、Zhanet 和 Akshatau）的前矿和同矿花岗岩的年代学、岩石成因和构造环境
DOI：
10.1016/j.lithos.2016.01.023
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发表时间：
2016-05
期刊：
影响因子：
3.5
通讯作者：
Eleonora Yusupovha Seitmuratova
中科院分区：
文献类型：
--
作者：
GuangMing Li;MingJian Cao;KeZhang Qin;Noreen J. Evans;Pete Hollings;Eleonora Yusupovha Seitmuratova
关于哈萨克斯坦中部东Kounrad、Zhanet和Akshatau钨-钼矿床的成矿年龄以及与这些矿床有关的花岗岩的岩石成因和构造-岩浆演化存在重大争议。针对这些问题，对成矿前和成矿期花岗岩进行了辉橄榄岩Re-Os定年、锆石U-Pb定年、全岩地球化学、Sr-Nd-Pb和锆石O-Hf同位素分析。成矿前花岗岩的锆石U-Pb年龄为320-309Ma，晚石炭世;成矿花岗岩的年龄为298-285Ma，早二叠世。辉钼矿Re-Os同位素数据表明，东Kounrad、Akshatau和Zhanet的成矿年龄分别为296 Ma、294 Ma和285 Ma。成矿前花岗岩和成矿花岗岩为高钾钙碱性、偏铝-稍过铝的I型花岗岩。成矿前花岗岩相对未分馏，而成矿花岗岩分馏程度较高。分离矿物相可能是钾长石、磷灰石、含钛相和少量斜长石。成矿前岩石与成矿岩石具有相似的Sr-Nd-Pb-Hf-O同位素组成特征（87Sr/86Sr）i = 0.70308 - 0.70501，ε Nd（t）=-0.5~+2.8，207Pb/204Pb = 15.60 - 15.82，锆石ε Hf（t）=+1.2~+15.6，δ 18O =+4.6~+10.3 ‰），全岩TDMC（Nd）（840 - 1120 Ma）和锆石TDMC（Hf）（320 - 1240 Ma）。同位素特征与10 - 30%的年轻下地壳同化古地壳所造成的混合岩浆源是一致的。这些花岗岩的年代学和地球化学研究表明，晚石炭世成矿前花岗岩形成于俯冲过程中，而早二叠世成矿的、高度分馏的花岗岩可能经历了显著的分馏作用，形成于晚石炭世末开始的伊犁-哈萨克斯坦造山带碰撞过程中，具有钾长石、磷灰石、含钛相和少量斜长石的残留岩组合。
There is significant debate regarding the mineralization ages of the East Kounrad, Zhanet and Akshatau W-Mo deposits of Central Kazakhstan, and the petrogenesis and tectono-magmatic evolution of the granites associated with these deposits. To address these issues, we present molybdenite Re-Os dating, zircon U-Pb dating, whole rock geochemistry as well as Sr-Nd-Pb and zircon O-Hf isotopic analyses on the pre-mineralization and ore-forming granites. U-Pb dating of zircons from pre-mineralization granitic rocks yield Late Carboniferous ages of 320–309 Ma, whereas ore-forming granites have Early Permian ages of 298–285 Ma. Molybdenite Re-Os isotopic data indicate a mineralization age of ~ 296 Ma at East Kounrad, ~ 294 Ma at Akshatau and ~ 285 Ma at Zhanet. The pre-ore and ore-forming granites are high-K calc-alkaline, metaluminous to slightly peraluminous I-type granites. The pre-mineralization granites are relatively unfractionated, whereas the ore-forming granites are highly fractionated. The fractionating mineral phases are probably K-feldspar, apatite, Ti-bearing phases and minor plagioclase. The pre-mineralization and ore-forming rocks are characterized by similar Sr-Nd-Pb-Hf-O isotopic compositions ((87Sr/86Sr)i= 0.70308–0.70501, εNd(t) = − 0.5 to + 2.8,207Pb/204Pb = 15.60–15.82, zircon εHf(t) = + 1.2 to + 15.6 and δ18O = + 4.6 to + 10.3‰), whole rock TDMC(Nd) (840–1120 Ma) and zircon TDMC(Hf) (320–1240 Ma). The isotopic characteristics are consistent with a hybrid magma source caused by 10–30% assimilation of ancient crust by juvenile lower crust. The geochronology and geochemistry of these granites show that the Late Carboniferous pre-mineralization granitic rocks formed during subduction, whereas the Early Permian ore-forming, highly fractionated granite probably underwent significant fractionation with a restite assemblage of K-feldspar, apatite, Ti-bearing phases and minor plagioclase and developed during collision between the Yili and Kazakhstan terranes commenced at the latest Late Carboniferous.
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影响因子：
3.5
作者：
Fu-Yuan Wu;Wei-Qiang Ji;Jian-Gang Wang;Chuan-Zhou Liu
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DOI：
10.1086/376763
发表时间：
2003-09
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影响因子：
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作者：
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通讯作者：
Guangming Li;Qin Kz;Li Jx
影响因子：
3.5
作者：
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通讯作者：
Chamberlain, Kevin R.