本文選題：雄村 + 島弧　； 參考：《地質(zhì)學(xué)報(bào)》2017年09期

【摘要】：西藏雄村銅金礦區(qū)位于岡底斯造山帶中段南緣,其南緊鄰雅魯藏布縫合帶(IYS)和日喀則弧前盆地,北為謝通門始新世大巖基。通過對(duì)雄村礦區(qū)砂巖進(jìn)行系統(tǒng)的鏡下鑒定,主量、微量元素分析,揭示雄村組砂巖構(gòu)造背景和物源屬性。研究結(jié)果顯示,雄村砂巖樣品SiO_2含量53.27%~66.13%,平均含量58.27%,與古生代雜砂巖(66.1%)相近。Al_2O_3含量較高(14.53%~24.04%),平均20.12%,指示砂巖長(zhǎng)石礦物較多且黏土化較強(qiáng)。綜合微觀特征,雄村砂巖為長(zhǎng)石巖屑砂巖。主量元素中特征氧化物組合Fe2O3+MgO(7.3%~17.6%)、TiO_2(0.68%~1.25%)、Al_2O_3/SiO_2(0.22%~0.45%)與大洋島弧成因砂巖值相似;微量元素蛛網(wǎng)圖上雄村砂巖相對(duì)虧損Ta、Nb、P、Ti及HREE等高場(chǎng)強(qiáng)元素而富集K、Rb、U、REE等大離子親石元素,REE球粒隕石標(biāo)準(zhǔn)化后具有輕稀土富集而重稀土元素較平坦的右傾分布模式。特征微量元素Th(2.5×10~(-6))、Zr(114×10~(-6))、Hf(3.6×10~(-6))、Ce(27.95×10~(-6))、Ti(0.54×10~(-6))含量及Th/U(2.9)、Zr/Th(46)、La/Sc(0.72)、Th/Sc(0.11)比值表明雄村砂巖具有大洋島弧成因性質(zhì),La-Th-Sc、Th-Sc-Zr/10、Th-Co-Zr/10等判別圖解顯示砂巖形成源區(qū)可能位于大洋島弧環(huán)境。稀土元素頁(yè)巖標(biāo)準(zhǔn)化后具有弱負(fù)Ce異常及正Eu異常,指示砂巖受海水及深部熱液雙重影響,同樣與大洋島弧環(huán)境頁(yè)巖標(biāo)準(zhǔn)化后特征相似。Co/Th-La/Sc和La/Th-Hf圖解表明雄村砂巖物源區(qū)為長(zhǎng)英質(zhì)中酸性火山巖源區(qū)和安山質(zhì)火山弧源區(qū),結(jié)合他人對(duì)砂巖中碎屑鋯石的年齡研究,認(rèn)為雄村礦區(qū)砂巖沒有早于晚三疊世的碎屑鋯石,具有島弧火山巖源區(qū)特點(diǎn)。
[Abstract]:Xiongcun copper and gold deposit area in Tibet is located in the southern margin of the Gangdis orogenic belt, adjacent to the Yalu Zangbo suture zone (IYS) and Xigaze forearc basin, and to the north is the large Eocene rock base of Xetongmen. The structural background and provenance attributes of Xiongcun formation sandstone are revealed by means of systematic microscopic identification, principal quantity and trace element analysis of the sandstone in Xiongcun mining area. The results show that the SiO_2 content of Xiongcun sandstone sample is 53.270.66.13 and the average content is 58.27, which is similar to that of Paleozoic impurity sandstone (66.1). The content of Al _ 2O _ 2O _ 3 is higher. The content of Al _ 2O _ 2O _ 3 is higher, with an average of 20.12, indicating that the sandstone has more feldspar minerals and stronger clay. Comprehensive microscopic characteristics, Xiongcun sandstone is feldspar lithic sandstone. The characteristic oxide assemblage Fe2O3 MgO7.3in the principal elements is 17.6T / TiO2S / 0.68 / 1.25 / T / T / Al2O3 / SiO20.22T / 0.45T), which is similar to the value of oceanic island arc origin sandstone; The sandstones of Xiongcun on the cobweb of trace elements are relatively depleted of high field strength elements such as Tahln NbPU Ti and HREE, and enriched with large ion lithophile elements, such as HREE, etc. After standardization, the REE chondrites have a pattern of light rare earth enrichment and flat right-dip distribution of heavy rare earth elements. The characteristic trace element Th(2.5 脳 10 ~ (10) ~ (-6) and the ratio of Th / T ~ (2. 9) ~ (2. 9) ~ (2. 9) La ~ (Sc) ~ (0.72) ~ (2) ~ (2) 2 ~ (2) O ~ (2 +) ~ (1) ~ (0. 11) indicate that the sandstone of Xiongcun has the genetic properties of oceanic island arc, La-Th-Sctc / Thc-Th10Zr-Zr10, and so on, indicating that the source area of the sandstone may be located in the oceanic arc environment, such as La-Th-Sctr. Th-Zr-Zr10 / Zr10. 10% -Zr10 / Zr10. The results show that the source area of the sandstone may be located in the oceanic arc environment, and the results show that the source area of the sandstone may be located in the oceanic arc environment. The REE shale is characterized by weak negative ce anomaly and positive EU anomaly after standardization, indicating that sandstone is affected by both seawater and deep hydrothermal solution. Also similar to the characteristics of shale normalized in oceanic island arc environment. Co-% Th-La-Sc and La/Th-Hf diagrams show that the source of Xiongcun sandstone is the source of felsic intermediate-acid volcanic rock and the source of Anshan volcanic arc. The age of clastic zircon in sandstone is studied in combination with others. It is considered that the sandstone in Xiongcun mine has no clastic zircon earlier than the late Triassic and has the characteristics of island arc volcanic source.
【作者單位】： 成都理工大學(xué)地球科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所國(guó)土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室;西藏天圓礦業(yè)資源開發(fā)有限公司;西藏大學(xué)工學(xué)院;中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;中國(guó)地質(zhì)大學(xué)地球科學(xué)與資源學(xué)院;
【基金】：大陸構(gòu)造與動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室開放基金重點(diǎn)項(xiàng)目(編號(hào)K201401) 國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào)41502079;41172077) 四川省青年基金項(xiàng)目(編號(hào)2014JQ0047) 四川省教育廳自然科學(xué)重點(diǎn)項(xiàng)目(編號(hào)15ZA0073) 地調(diào)項(xiàng)目(編號(hào)12120114068401)聯(lián)合資助成果
【分類號(hào)】：P618.41;P618.51

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