【摘要】：薩熱克含銅盆地庫孜貢蘇組是復(fù)合型沖積扇沉積相,在薩熱克含銅盆地元古界—新生界地層劃分基礎(chǔ)上,厘定了晚侏羅世層控型鉛鋅銅礦的賦礦層—庫孜貢蘇組是一套快速沉積的沖積扇沉積相。薩熱克含銅盆地出露最老的地層為長城系阿克蘇群變質(zhì)巖,其上疊地層依次為莎里塔什組(J_1s)、康蘇組(J_1k)、楊葉組(J_2y)、塔爾尕組(J_2t)、庫孜貢蘇組(J_3k)、克孜勒蘇組(K1kz)。對庫孜貢蘇組沖積扇沉積相進(jìn)行研究分析,有助于針對新疆烏恰縣薩熱克含銅盆地的銅多金屬礦產(chǎn)開展基礎(chǔ)地質(zhì)調(diào)查,大致查明盆地內(nèi)銅礦找礦前景。利用研究區(qū)24個鉆孔和13條露頭剖面資料,運用高分辨率層序地層學(xué)知識對沖積扇沉積相層序地層進(jìn)行了短期基準(zhǔn)面旋回、中期基準(zhǔn)面旋回劃分。綜合各實測剖面、鉆孔的短期基準(zhǔn)面旋回分界面、地層巖石序列特征及洪泛面特征,將各實測剖面、鉆孔沉積序列均劃分為若干短期基準(zhǔn)面旋回和兩個中期基準(zhǔn)面旋回(MSC1、MSC2)。同時,依據(jù)巖性和巖相的垂向變化特征,沖積扇體可劃分為扇根、扇中、扇緣3個亞相。扇根亞相分為主槽、泥石流、片流帶3個微相;扇中亞相又分為辮狀河道、河漫灘2個微相;扇緣亞相沉積多為洪漫帶微相,局部為間歇河道微相;除此之外,沖積扇體之間還有扇間沉積。結(jié)合盆地各地域古流向特征,選取合適的實測剖面、鉆孔,運用高分辨率層序地層學(xué)原理進(jìn)行單孔沉積相、連孔沉積相分析,建立四條地層等時格架對比剖面,用來分析復(fù)合型沖積扇沉積相各中期基準(zhǔn)面旋回期間沖積扇平面發(fā)育特征。利用優(yōu)勢相理論知識,繪制各中期基準(zhǔn)面旋回期間沖積扇亞相沉積分布圖。結(jié)合研究區(qū)各區(qū)域礫巖、砂巖巖石學(xué)特征,對庫孜貢蘇組沉積相研究進(jìn)行補充完善。MSC2期間,盆地北部、南部區(qū)域發(fā)育較大規(guī)模銅礦體(化)條帶;MSC1期間,僅盆地北部、南部區(qū)域部分鉆孔區(qū)、實測剖面區(qū)處見小規(guī)模銅礦體(化)條帶。
[Abstract]:The Zigongsu formation, the basement of the Sajek copper-bearing basin, is a composite alluvial fan sedimentary facies, which is based on the division of the Proterozoic and Cenozoic strata in the Sajek copper-bearing basin. Kuzigongsu formation of late Jurassic stratabound lead-zinc copper deposit is a set of fast sedimentary alluvial fan sedimentary facies. The oldest strata in the Sajek copper-bearing basin are the metamorphic rocks of Aksu group of the Great Wall system. The superimposed strata are: Saritash formation (J1s), Kangsu formation (JStu1k), Yangye formation (J2y), Talga formation (J2t). Kuzigongsu formation (Js 3k), Kizilesu formation (K1kz). The study and analysis of sedimentary facies of alluvial fan in Kuzigongsu formation is helpful to carry out basic geological investigation on copper polymetallic deposits in Sarek copper-bearing basin of Wuqian County Xinjiang and to find out the prospecting prospect of copper deposits in the basin. Based on the data of 24 boreholes and 13 outcrop sections in the study area, the sedimentary facies sequence stratigraphy of alluvial fan has been divided into short-term base-level cycle and mid-base-level cycle using high-resolution sequence stratigraphic knowledge. By synthesizing the measured profiles, the short term base-level cycle of boreholes, the characteristics of strata rock sequence and flood surface, the measured profiles and drilling sedimentation sequences are divided into several short-term base-level cycles and two medium-term base-level cycles (MSC1,). MSC2) At the same time, according to the vertical variation of lithology and lithofacies, the alluvial fan body can be divided into three subfacies: fan root, fan middle and fan margin. The fan root subfacies are divided into three microfacies: main channel, debris flow and flow zone; the fan central facies is divided into braided channel and floodplain, and the fan margin subfacies is mostly flood diffuse microfacies, partial intermittent channel microfacies; In addition, there is also between alluvial fan body between fan deposit. According to the paleo-direction characteristics of each region of the basin, the appropriate measured section is selected, the borehole is drilled, the single-hole sedimentary facies and the multi-hole sedimentary facies are analyzed by using the high-resolution sequence stratigraphy principle, and four isochronous frame correlation sections are established. It is used to analyze the development characteristics of alluvial fan plane during the middle period of base-level cycle of sedimentary facies of composite alluvial fan. Based on the theory of dominant facies, the subfacies distribution map of alluvial fan during the middle period of base-level cycle is plotted. Combined with the petrological characteristics of conglomerate and sandstone in various regions of the study area, the sedimentary facies of Kuzigongsu formation were supplemented and perfected. During the period of MSC2, large scale copper ore bodies (mineralization) were developed in the northern and southern regions of the basin. During MSC1, only in the northern and southern regions of the basin, there are small scale copper deposits in the measured section.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P534.52;P618.4

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