Studies on Geochemistry, Zircon U-Pb Geochronology and Hf isotopes of Granite in Wangfeng Area at the Northern Margin of Middle Tianshan, Xinjiang

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Studies on Geochemistry, Zircon U-Pb Geochronology and Hf isotopes of Granite in Wangfeng Area at the Northern Margin of Middle Tianshan, Xinjiang

详细信息

责任者：Yang Meng(State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’ an 710069 ; China) ; Wang JuLi
刊名：Acta Petrologica Sinica
出版年：2012
卷期：28(7)
关键词：S型花岗岩 ; S-type granite ; 天山 ; Tianshan Mountains
页码：p.2121-2131
图表：illus.,3 tables,51 refs.
分类号：0801
issnNo：ISSN1000-0569
isbnNo：CN11-1922/P

摘要

mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Rock samples in Wangfeng area consisting of two-mica monzonitic granite and biotite monzonitic granite locate in the northern margin of Middle Tianshan in Xinjiang,exhibiting as the direct gold-bearing country rocks,which synthetically display characteristics of peraluminous S-type granite or MPG belonging to high-K calcalkaline series: Allitic mineral assemblages of granitic rocks with medium-fine grained granitic texture and weakly gneissic structure comprise primary muscovite and biotite.Geochemically,Wangfeng granite is characterized by high SiO_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">,Al_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">O_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">3}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"> and ALK with K_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">O/Na_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">O ratios changing from 1.07 to 1.25 and 1.15 on average,A/CNK ratios range from 1.10 to 1.12 and 1.11 on average.Granite samples are rich in LREE and LILE(K,Rb,Th,U etc.),infertile in HREE and Ba,Sr,P,Ti,Nb,Ta etc.,coupling with moderate Eu negative anomaly(mal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-SIZE: 12px; FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">δmal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Eu=0.42～0.49),which are in relation to magmatic fractionation.Wangfeng granite intruded at 439.9±2.2Ma based on the dating results of zircon U-Pb geochronology.Zircon Lu-Hf isotopic compositions indicate that mal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-SIZE: 12px; FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">ε_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">Hf}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">(mal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-SIZE: 12px; FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">tmal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">)=-5.0～-1.3 with an average of -2.72,two-stage model ages(mal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-SIZE: 12px; FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">t_{mal; FONT-STYLE: normal; TEXT-INDENT: 0px; FONT-FAMILY: ��,verdana; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); FONT-WEIGHT: normal; WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">DM2}mal; ORPHANS: 2; FLOAT: none; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">)range from 1294Ma to1482Ma,which yields Wangfeng granite derived from partial melting of Mid-Mesoproterozoic crystallized basements formed during the process of metamorphism of greywacke combining with the plotting results of experimental petrology.In terms of both previous research results on regional tectonic setting and tectonic discrimination diagrams,Wangfeng granite formed at the syn-collisional stage of Caledonian Orogeny,there is a quite significant conclusion that Middle Tianshan may be compound,which is composed of orogenic belts with distinct inner frameworks.

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