新疆萨热克含铜盆地上侏罗统库孜贡苏组层序地层及其复合型冲积扇沉积相研究
发布时间：2018-11-20 06:23
【摘要】：萨热克含铜盆地库孜贡苏组是复合型冲积扇沉积相,在萨热克含铜盆地元古界—新生界地层划分基础上,厘定了晚侏罗世层控型铅锌铜矿的赋矿层—库孜贡苏组是一套快速沉积的冲积扇沉积相。萨热克含铜盆地出露最老的地层为长城系阿克苏群变质岩,其上叠地层依次为莎里塔什组(J_1s)、康苏组(J_1k)、杨叶组(J_2y)、塔尔尕组(J_2t)、库孜贡苏组(J_3k)、克孜勒苏组(K1kz)。对库孜贡苏组冲积扇沉积相进行研究分析,有助于针对新疆乌恰县萨热克含铜盆地的铜多金属矿产开展基础地质调查,大致查明盆地内铜矿找矿前景。利用研究区24个钻孔和13条露头剖面资料,运用高分辨率层序地层学知识对冲积扇沉积相层序地层进行了短期基准面旋回、中期基准面旋回划分。综合各实测剖面、钻孔的短期基准面旋回分界面、地层岩石序列特征及洪泛面特征,将各实测剖面、钻孔沉积序列均划分为若干短期基准面旋回和两个中期基准面旋回(MSC1、MSC2)。同时,依据岩性和岩相的垂向变化特征,冲积扇体可划分为扇根、扇中、扇缘3个亚相。扇根亚相分为主槽、泥石流、片流带3个微相;扇中亚相又分为辫状河道、河漫滩2个微相;扇缘亚相沉积多为洪漫带微相,局部为间歇河道微相;除此之外,冲积扇体之间还有扇间沉积。结合盆地各地域古流向特征,选取合适的实测剖面、钻孔,运用高分辨率层序地层学原理进行单孔沉积相、连孔沉积相分析,建立四条地层等时格架对比剖面,用来分析复合型冲积扇沉积相各中期基准面旋回期间冲积扇平面发育特征。利用优势相理论知识,绘制各中期基准面旋回期间冲积扇亚相沉积分布图。结合研究区各区域砾岩、砂岩岩石学特征,对库孜贡苏组沉积相研究进行补充完善。MSC2期间,盆地北部、南部区域发育较大规模铜矿体(化)条带;MSC1期间,仅盆地北部、南部区域部分钻孔区、实测剖面区处见小规模铜矿体(化)条带。
[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.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P534.52;P618.4
本文编号：2344047
[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.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P534.52;P618.4
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相关硕士学位论文 前2条
1 陆俊吉;新疆乌恰萨热克铜矿北矿带库孜贡苏组地层沉积相研究[D];昆明理工大学;2016年
2 乔欣;新疆萨热克含铜盆地上侏罗统库孜贡苏组层序地层及其复合型冲积扇沉积相研究[D];昆明理工大学;2016年
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