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First Discovery of Late Triassic Tuffs in the South Qilian Basin: Geochemical Characteristics, Zircon LA-ICP-MS U-Pb Ages and Potential Source Regions

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Journal of Earth Science 2023年第6期34卷 1692-1703页

作者： fangpeng du Furong Tan Shiming Liu Xiaochen Zhao Yingtao Chen Junwei Qiao School of Petroleum Engineering and Environmental Engineering Yan'an UniversityYan'an 716000China China National Administration of Coal Geology Beijing 100038China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China Key Laboratory of Resource Exploration Research of Hebei Province Hebei University of EngineeringHandan 056038China College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710054China

This investigation reports the first discovery of more than 70 tuff intervals in the Upper Triassic,South Qilian *** and geochemical analyses were carried out on ten tuff samples and zircon U-Pb dating were on *** section and X-ray diffraction(XRD)results indicate that the tuffs were composed of crystal shards and altered glass shards;crystal shards include plagio-clase and *** of the tuffs had been transformed into illite/smectite mixed-layers(I/S).In addition,calcite,pyrite,dolomite and siderite were also identified in some of the tuff *** of major elements suggests that the tuffs are peraluminous high-K calcalkaline *** elements indicate that the tuffs are enriched in high field strength elements(HFSE),including Th,U,Ta,Zr and *** characteristics suggest that the tuffs originated from comendite pantellerite and rhyolite from within plate *** U-Pb dating(236.0±1.7,231.4±1.6,and 223.1±3.9 Ma)indicate that the tuffs were erupted in the Late *** chronology and geochemical analyses suggest that the West Qinling belt and the East Kunlun belt are the potential source regions of these tuffs,and they originated from the within plate magma during a post-collisional period.

关键词： tuff South Qilian Basin Late Triassic U-Pb isotopic dating source regions zircon geo-chemistry

Provenance Analyses of Lower Cretaceous Strata in the Liupanshan Basin: From Paleocurrents Indicators, Conglomerate Clast Compositions, and Zircon U-Pb Geochronology

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Journal of Earth Science 2020年第4期31卷 757-771页

作者： Xiaochen Zhao Chiyang Liu Jianqiang Wang Wei Luo fangpeng du Li Ma College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710054China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China BGP Inc. China National Petroleum Corporation Southwest Geophysical Research InstituteChengdu 610000China College of Energy Engineering Xi'an University of Science and TechnologyXi'an 710054China

The Liupanshan Basin constitutes a major portion of the northern North-South tectonic belt. The Lower Cretaceous strata in the Liupanshan Basin recorded the tectono-sedimentary evolution processes of this area and are pivotal for understanding the original sedimentary appearance of the Liupanshan Basin. In this work, we present a study of provenance and tectono-sedimentary evolution of the Liupanshan Basin during the Early Cretaceous. Integrated-paleocurrent directions, gravel clast compositions, and detrital zircon U-Pb isotopic analysis of the Lower Cretaceous Sanqiao and Heshangpu formations were applied to determine the provenance. The gravel clast compositions of Sanqiao Formation conglomerates(mainly including magmatic rocks, metamorphic rocks and limestones) display various features in different places, revealing different rock components of source areas. The paleocurrent directions of the Sanqiao and Heshangpu formations suggest that the sediments were transported from the basin margin to the center. Detrital zircons of two samples from the Huoshizhai Section(northwestern Liupanshan Basin) yield a dominant unimodal distribution from 420 to 500 Ma, suggesting a single-sourced provenance. Based on the above analyses, comparing to the magmatic records in the Qilian-Qinling orogenic belt, the detritus of the Sanqiao and Heshangpu formations were mainly from the proximal metamorphic and magmatic rocks of the Qilian-Qinling orogenic belt and the limestones of the archaic uplift. Combined with sedimentary characteristics, we concluded that the Liupanshan Basin experienced multi-stage evolution history:(1) the early rifting extension stage(Sanqiao Period),(2) the middle spanning and depression stage(Heshangpu–Early Naijiahe Period), and(3) the late extinction stage(Late Naijiahe Period). The evolution of Liupanshan Basin is closely related to that of Ordos Basin and it is further associated with tectonic transition of the northern North-South tectonic belt.

关键词： provenance analyses tectono-sedimentary evolution Liupanshan Basin Lower Cretaceous North-South tectonic belt

Origin of the Gas Hydrate and Free Gas in the Qilian Permafrost,Northwest China:Evidence from Molecular Composition and Carbon Isotopes

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 602-616页

作者： TAN Furong LI Yang du fangpeng LIU Shiming CUI Weixiong LIU Zhiwu GENG Qingming LU Ping State Key Laboratoiy of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China State Key Laboratory of Organic Geochemistty Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China China National Administration of Coal Geology Beijing 10038China Shaanxi Mineral Resources and Geological Survey Xi'an 71006SChina Xi'an Research Institute of China Coal Technology&Engineering Group Corp. Xi'an 710077China College of Earth Science and Resources Chang'an UniversityXi'an 710054China

The Qilian permafrost of the South Qilian Basin(SQB)has become a research focus since gas hydrates were discovered in *** many works from different perspectives have been conducted in this area,the origin of gas from gas hydrate is still *** composition and carbon isotope of 190 samples related to gas hydrates collected from 11 boreholes allowed exploration of genetic type,thermal maturity,biodegradation,as well as gas-source correlation of alkane gases from gas hydrates and free *** indicate that alkane gases biodegraded after the formation of natural *** to differences in carbon isotopes of methane and their congeners(CH4,C2H6,C3H8),the thermal maturity(vitrinite reflectance,VRo)of most alkane gases ranges from 0.6%to 1.5%,indicating a mature to high mature *** thermal maturity VRo of a small part of alkane gas(in boreholes DK5 and DK6)is higher than 1.3%,indicating a high mature *** gases were mainly produced by secondary cracking,consisting of crude oilcracking gases and wet gases cracking to dry *** types of alkane gases are primarily oil-type gases generated from shales and mudstones in the upper Yaojie Formation of Jurassic,with less coal-type gases originated from the mudstones in the Triassic Galedesi Formation and the lower Yaojie Formation of *** dioxides associated with alkanes from gas hydrates and free gases indicate the thermal decomposition and biodegradation of organic *** origins of natural gases from gas hydrates and free gases shed light on the evaluation of petroleum resource potential,deeply buried sediments,and petroleum resource exploration in the SQB.

关键词： uunconventional energy gas hydrate carbon isotope alkane gas origin thermal maturity South Qilian Basin

陕北曹家滩矿井富油煤地球化学特征及其沉积环境

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西安科技大学学报 2024年第2期44卷 289-300页

作者：乔军伟董伸培苏刚王昌建焦龙祥梁向阳杜芳鹏李领晨西安科技大学地质与环境学院陕西西安710054 西安科技大学陕西省煤炭绿色开发地质保障重点实验室陕西西安710054 陕西陕煤曹家滩矿业有限公司陕西榆林719000 延安大学石油工程与环境工程学院陕西延安716000

为探讨陕北富油煤形成的沉积环境和控制因素,采用井下刻槽和钻探定向取样相结合的方法采集了曹家滩矿井2^(-2)煤的垂向剖面煤样,对样品的煤岩煤质参数和等离子低温灰化样的地球化学参数进行了系统测试,从有机显微煤岩组成和无机地球化... 详细信息

为探讨陕北富油煤形成的沉积环境和控制因素,采用井下刻槽和钻探定向取样相结合的方法采集了曹家滩矿井2^(-2)煤的垂向剖面煤样,对样品的煤岩煤质参数和等离子低温灰化样的地球化学参数进行了系统测试,从有机显微煤岩组成和无机地球化学特征方面研究了2^(-2)煤层形成的沉积环境,探讨了焦油产率与沉积环境之间的关系,揭示了富油煤形成的主要控制因素。结果表明:曹家滩矿井2^(-2)煤层以亮煤、暗淡煤为主,显微煤岩组成以惰质组为主、镜质组次之,壳质组含量较少;低温灰化样无机矿物组成主要是方解石、石英和黏土,元素组成以Ca、Si、Fe、Al、S、Mg和Na为主;微量元素中大多数元素处于亏损,仅有Cs、Ba属于轻度富集;稀土元素含量均值9.91μg/g,低于世界煤均值68.47μg/g;煤相分析显示2^(-2)煤主要形成于干燥森林沼泽和潮湿森林沼泽中,成煤植物以低木本植物为主,整体属于弱还原的陆相淡水沉积环境、水动力条件弱,沉积期以温湿和干热的过渡气候为主,晚期出现了古气候由温湿向干热气候转变;显示了2^(-2)煤焦油产率与镜质组含量、凝胶化指数、Sr/Ba、Ni/Co、Ce/La等呈正相关关系,但与植物保存指数、植被指数及Fe_(2)O_(3)、Fe_(2)O_(3)+CaO+MgO、MnO_(2)含量呈负相关关系。富油煤在分布上具有中高等镜质组含量、中高凝胶化程度和低木本组分的特征,即植物组织保存程度低、凝胶化程度较高、低木本植物,以及有适量的陆源碎屑物质供应、适量盐度的还原沉积环境更有利于富油煤的生成。

关键词：沉积环境地球化学富油煤延安组曹家滩矿井

维普期刊数据库博看期刊

昭通盆地褐煤元素地球化学特征及对沉积环境的响应

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延安大学学报（自然科学版） 2024年第3期43卷 33-41页

作者：杜芳鹏李聪聪谭富荣贺小元许文哲杨剑羽延安大学石油工程与环境工程学院陕西延安716000 中国煤炭地总局航测遥感局陕西西安710199 陕西省地质调查院陕西西安710054

昭通盆地是云南新近纪小型褐煤-泥炭盆地之一,为查明昭通盆地褐煤中金属元素富集特征,恢复褐煤沉积期古气候和沉积环境,采集了昭通盆地M_(2)煤层上部褐煤样品开展了主-微量元素分析。结果表明,M_(2)褐煤层主要特征为SiO_(2)含量低,平均... 详细信息

昭通盆地是云南新近纪小型褐煤-泥炭盆地之一,为查明昭通盆地褐煤中金属元素富集特征,恢复褐煤沉积期古气候和沉积环境,采集了昭通盆地M_(2)煤层上部褐煤样品开展了主-微量元素分析。结果表明,M_(2)褐煤层主要特征为SiO_(2)含量低,平均仅占灰成分的24.4%,明显低于中国煤平均值;微量元素均未达到富集,富集程度为正常或亏损。在褐煤样品的地质和煤质特征约束下,通过Sr/Ba、δCe、Sr/Cu等指标恢复M_(2)煤层上部主要形成于湿润-半湿润气候,低盐度、弱氧化-弱还原环境,水体流动性较弱,陆源碎屑供给弱;气候特征与沉积环境在垂向上具有一定变化,根据地球化学指标可将其划分为5个不同的沉积演化阶段。气候经历了半湿润-湿润-半湿润-半湿润-湿润;响应地,泥炭沼泽沉积环境经历了弱氧化-弱还原-弱氧化-弱还原-弱氧化,水体流动性和陆源碎屑供给经历了减弱-增强-减弱-减弱-增强的周期性变化。该研究可为昭通褐煤关键金属元素富集研究及沉积环境研究提供重要支撑。

关键词：昭通盆地褐煤微量元素沉积环境古气候

Discussion of gas hydrate origin in Juhugeng mining area of Muli coalfield

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Discussion of gas hydrate origin in Juhugeng mining area of ...

新疆卡姆斯特煤田西山窑组煤层发育特征与煤质分析

第三届全国青年地质大会

作者： Furong Tan Shiming Liu fangpeng du Weixiong Cui Yuqing Wan Chuang Ynag Weigang Liu Yuhai Fan Geological Exploration Institute of Aerial Photogrammetry and Remote Sensing Bureau Qinghai Institute of Coal Geological Prospecting Xi'an Research Institute of China Coal Technology & Engineering Group Corp

1 Introduction Muli Coalfield is located in the northeast of Tibetan *** has become a research hotspot in recent years,since the discovery of gas hydrate in Yaojie formation of Juhugeng mining,Muli coalfield.(Zhu,2009).Researches aimed at gas hydrate component,gas origin(Wang et al.,2009,Lu et al.,2010),formation condition(Zhu et al.,2010),microbial populations(Han et al.,2011)and characteristics of seismic(Xu et

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地质科技情报 2016年第1期35卷 152-155页

作者：牛军强杜芳鹏中国煤炭地质总局航测遥感局西安710054

准噶尔盆地东北缘卡姆斯特地区中侏罗统西山窑组为一套辫状河三角洲相沉积，主要可采煤层发育于三角洲平原，其中B1煤层最厚可达11．6m，平均厚度6．1m，厚度稳定、横向连续性好。煤岩显微组分以镜质组为主（73．3％），次为，隋质组（1... 详细信息

准噶尔盆地东北缘卡姆斯特地区中侏罗统西山窑组为一套辫状河三角洲相沉积，主要可采煤层发育于三角洲平原，其中B1煤层最厚可达11．6m，平均厚度6．1m，厚度稳定、横向连续性好。煤岩显微组分以镜质组为主（73．3％），次为，隋质组（13．3％），另含少量壳质组（6，2％）；无机组分则以碳酸盐矿物为主，另含少量黏土矿物。煤岩镜质体反射率（R0）范围为O．419％～O．522％，媒质，总体以中灰、低硫、特低氯、特低磷、特低发热量的长焰煤为特征。

关键词：卡姆斯特煤田侏罗系西山窑组长焰煤

新疆淖毛湖煤田A_(4)煤层优质直接液化用煤煤质特征与成因

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煤炭学报 2021年第1期46卷 251-262页

作者：宁树正黄少青杜芳鹏张莉张建强朱士飞中国煤炭地质总局勘查研究总院北京100039 西安科技大学地质与环境学院西安710054 江苏矿产地质设计研究院江苏徐州221006

新疆淖毛湖煤田A_(4)煤层具有优质的直接液化特性,以淖毛湖煤田A_(4)煤层为对象开展直接液化用煤研究,对优质直接液化用煤质量特征和成因认识具有重要意义。研究样品采集于淖毛湖煤田白石湖露天矿,测试结果显示淖毛湖煤田A_(4)煤层煤中... 详细信息

新疆淖毛湖煤田A_(4)煤层具有优质的直接液化特性,以淖毛湖煤田A_(4)煤层为对象开展直接液化用煤研究,对优质直接液化用煤质量特征和成因认识具有重要意义。研究样品采集于淖毛湖煤田白石湖露天矿,测试结果显示淖毛湖煤田A_(4)煤层煤中各样品的氢碳原子平均值达0.94,挥发分产率平均达49.2%,直接液化的活性组分(镜质组+壳质组)含量高达97.7%,而A_(4)煤层灰分平均5.2%,灰分极低,且灰分中对直接加氢液化有不良影响的SiO_(2)和Al_(2)O_(3)质量分数较低,对液化有催化作用的Fe_(2)O_(3)质量分数较高。所以淖毛湖煤田煤岩煤质“三高一低”(高氢碳原子比、高挥发分及高活性组分、低灰分)的特征为直接液化带来了有利条件。淖毛湖煤样镜质组最大反射率平均值为0.42%,处在直接液化的最佳煤化阶段。煤相研究结果表明,淖毛湖煤田A_(4)煤层形成的早侏罗世八道湾组沉积所处的泥炭沼泽环境为富钙环境,保证了泥炭堆积早期的腐殖化作用和生物化学凝胶化作用,地层层序属于水进序列,能够很好的在泥炭堆积后迅速被上覆沉积物所覆盖,保证了泥炭处在缺氧的还原环境,使得凝胶化作用充分进行;同时,煤层上覆、下伏地层均隔水性良好,保证了煤岩组分的演化过程不易受到来自顶底板的富氧水的影响,上述因素,形成淖毛湖煤田煤超高的直接液化活性组分(镜质组+壳质组)的重要因素,为优质直接液化用煤形成提供了有利条件。

关键词：直接液化用煤淖毛湖煤田八道湾组液化性能煤岩组分凝胶化作用

A Practical Regular LDPC Coded Scheme for Physical-Layer Information Security

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China Communications 2024年第5期21卷 190-201页

作者： du Junyi CETC Key Laboratory of Avionic Information System Southwest China Institute of Electronic TechnologyChengdu 610036China

In this paper,we aim to design a practical low complexity low-density parity-check(LDPC)coded scheme to build a secure open channel and protect information from *** this end,we first propose a punctured LDPC coded scheme,where the information bits in a codeword are punctured and only the parity check bits are transmitted to the *** further propose a notion of check node type distribution and derive multi-edge type extrinsic information transfer functions to estimate the security performance,instead of the well-known weak metric bit error *** optimize the check node type distribution in terms of the signal-to-noise ratio(SNR)gap and modify the progressive edge growth algorithm to design finite-length *** results show that our proposed scheme can achieve a lower computational complexity and a smaller security gap,compared to the existing scrambling and puncturing schemes.

关键词： extrinsic information transfer function physical layer scheme secure open channel security gap