本文選題：石英二長(zhǎng)閃長(zhǎng)巖 + 早志留世�。� 參考：《現(xiàn)代地質(zhì)》2016年06期

【摘要】：新疆東準(zhǔn)噶爾姜格爾庫(kù)都克石英二長(zhǎng)閃長(zhǎng)巖體被下泥盆統(tǒng)卓木巴斯套組不整合覆蓋,其形成時(shí)代一直缺乏精確的年代學(xué)約束。采用LA-ICP-MS鋯石U-Pb同位素測(cè)年方法,獲得石英二長(zhǎng)閃長(zhǎng)巖鋯石U-Pb年齡為(432.8±1.2)Ma,表明侵位時(shí)限為早志留世。巖石地球化學(xué)顯示,石英二長(zhǎng)閃長(zhǎng)巖具低硅(Si O2=55.64%~58.68%)、低鈦(Ti O2=0.54%~0.71%)、高鋁(Al2O3=16.99%~18.05%)的特征,屬高鉀鈣堿性、準(zhǔn)鋁質(zhì)(A/CNK=0.85~1.00)系列,富集輕稀土元素(LREE)(LREE/HREE=2.88~3.26)和大離子親石元素(LILE,如K、Rb、Ba和Sr),虧損高場(chǎng)強(qiáng)元素(HFSE:Nb、Ta、Ti)及P,反映出明顯的消減帶巖漿巖的特征。鋯石具正εHf(t)值,介于+10.8~+13.6之間,兩階段Hf模式年齡(TDM2)為726~560 Ma,大于其形成年齡,表明源區(qū)可能為新元古代晚期至早古生代早期的新生島弧陸殼物質(zhì)。結(jié)合區(qū)域地質(zhì)背景,認(rèn)為姜格爾庫(kù)都克石英二長(zhǎng)閃長(zhǎng)巖可能由俯沖洋殼和沉積物的含水流體引起上覆地幔楔以新元古代晚期至早古生代早期的新生島弧陸殼物質(zhì)部分熔融形成的,代表了古亞洲洋在早志留世時(shí)期向南俯沖消減的陸緣弧巖漿產(chǎn)物。
[Abstract]:The Xinjiang East Junggar Jianggaer Kuduk quartz monzodiorite is covered by the unconformity of the Lower Devonian Zhuomubas formation, and its formation age has been short of precise chronological constraints. Using LA-ICP-MS zircon U-Pb isotopic dating method, the zircon U-Pb age of quartz monzodiorite is 432.8 鹵1.2 Ma, indicating that the emplacement time is early Silurian. The petrochemistry shows that the quartz monzodiorite has the characteristics of low silica, SiO2, 55.64 and 58.68, low Ti, Ti, O, 0.54, 0.54, 0.71, and high alumina, Al _ 2O _ 3, 16.99, and 18.05), which belong to the high-potassium calc-alkaline, quasi-aluminous Ar / CNK 0.85 / 1.00 series. The enrichment of LREE / HREE (2.88 ~ 3.26) and the large ion lithophile elements such as K _ (RbN) Ba and Sr ~ (2 +), and the depletion of high field strength elements (HFSE: NB ~ (+) Tatii) and Pe) reflect the characteristics of subducted zone magmatic rocks. The zircon has a positive 蔚 HfT (10.8 ~ 13.6), and the two-stage HF model age (TDM2) is 726560Ma. it is larger than its age of formation, indicating that the source region may be a neoproterozoic to early Paleozoic Cenozoic island-arc continental crust material. Combined with the regional geological background, It is considered that the Jiangerkuduk quartz monzodiorite may have been formed by the partial melting of the overlying mantle wedge from subducted oceanic crust and water bearing fluid in sediments from the late Neoproterozoic to the early Paleozoic. It represents the continental margin arc magma that subducted southward during the early Silurian period in the Paleo-Asian Ocean.
【作者單位】： 陜西區(qū)域地質(zhì)礦產(chǎn)研究院;
【基金】：中國(guó)地質(zhì)調(diào)查局項(xiàng)目“新疆滴水泉幅(L45C003004) 北塔山牧場(chǎng)幅(L46C003001)1∶25萬(wàn)區(qū)調(diào)修測(cè)”(1212011120500) 中央返還兩權(quán)價(jià)款資金項(xiàng)目“新疆東準(zhǔn)噶爾卡拉麥里金礦帶控礦構(gòu)造調(diào)查研究及靶區(qū)優(yōu)選”(Y15-1-LQ02)
【分類號(hào)】：P588.122;P597

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