检索结果-南通市图书馆

Provenance of the Lower Jurassic pyroclastic sediments in the Zigui Basin:Implication for crustal thickening in the eastern qinling orogenic belt

引用

Science China Earth Sciences 2024年第1期67卷 196-207页

作者： Rong CHAI Jianghai YANG Yuansheng DU Chengshan WANG School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100023China School of Earth Sciences China University of Geosciences(Wuhan)Wuhan 430074China Chinese Academy of Geological Sciences Beijing 100037China

The Late Triassic witnessed significant collisional orogenic events in the qinling orogenic belt,accompanied by magma underplating and tectonic deformation.These processes potentially resulted in substantial crustal thickening and uplift of the qinling orogen.However,due to the absence of igneous rock records from this period in the eastern section of the qinling orogen,the changes in crustal thickness during this orogenic process have not been thoroughly investigated.A series of foreland basins emerged during the Early Mesozoic to the south of the East qinling orogenic belt.These basins have preserved clastic sedimentary rocks derived from the uplift and erosion of the orogenic belt.These sedimentary records serve as crucial records to reconstruct the evolutionary history of the qinling orogen.To further clarify the collisional orogenic process of the qinling orogenic belt,this study conducted in situ volcanic lithic fragment geochemistry,detrital zircon U-Pb chronology and trace element composition analysis on the sandstones of the Lower Jurassic Tongzhuyuan Formation in the Zigui Basin.The results suggest that the sandstones,which exhibit a significant abundance of volcanic lithic fragments,has a characteristic detrital zircon age group of 250–200 Ma,indicating a major provenance from the Triassic volcanic rocks.Combined with regional correlation and paleocurrent analysis,the detrital zircon U-Pb age data show that the source area of volcanic rocks should be in the qinling orogenic belt to the north of the basin.This interpretation is further supported by the Triassic granitic rocks exposed in the western part of the orogenic belt,representing the magmatism during the Triassic collisional orogenesis in the qinling orogen.Based on the co-varying relationships between present-day crust thickness with the chemical compositions of granite rocks and zircons,the La/Yb ratio of volcanic lithic fragments in the Tongzhuyuan Formation and the Eu/Eu*ratio of detrital zircons with Triassic ages indicate that the qinling o

关键词： qinling orogenic belt Zigui Basin Late Triassic Detrital zircons Crustal thickening

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Structural Geology and Chronology of Shear Zones along the Shangdan Suture in qinling orogenic belt,China:Implications for Late Mesozoic Intra-Continental Deformation of East Asia

引用

Journal of Earth Science 2024年第2期35卷 376-393页

作者： Falak Sheir Wei Li Le Zhang Basil Alabowsh Liuqing Jiang Li Liang Sainan Gao Shair Baz Umar Ashraf State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an710069China Institute of Geology University of PunjabLahore45590Pakistan

The Shangdan suture zone(SDZ)in the qinling orogenic belt(QOB)is a key to understanding the East Asia tectonic evolution.The SDZ gives information about convergent processes between the North China Block(NCB)and South China Block(SCB).In the Late Mesozoic,several shear zones evolved along the SDZ boundary that helps us comprehend the collisional deformation between the NCB and SCB,which was neglected in previous studies.These shear zones play an essential role in the tectonic evolution of the East Asia continents.This study focuses on the deformation and geochronology of two shear zones distributed along the SDZ,identified in the Shaliangzi and Maanqiao areas.The shear sense indicators and kinematic vorticity numbers(0.54–0.90)suggest these shear zones have sinistral shear and sub-simple shear deformation kinematics.The quartz’s dynamic recrystallization and c-axis fabric analysis in the Maanqiao shear zone(MSZ)revealed that the MSZ experienced deformation under green-schist facies conditions at∼400–500℃.The Shaliangzi shear zone deformed under amphibolite facies at∼500–700℃.The^(40)Ar/^(39)Ar(muscovite-biotite)dating of samples provided a plateau age of 121–123 Ma.Together with previously published data,our results concluded that QOB was dominated by compressional tectonics during the Late Early Cretaceous.Moreover,we suggested that the Siberian Block moved back to the south and Lhasa-Qiantang-Indochina Block to the north,which promoted intra-continental compressional tectonics.

关键词： qinling orogenic belt Shangdan suture zone shear zone Late Mesozoic intra-continental deformation East Asia tectonics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

qinling orogenic belt:Its Palaeozoic-Mesozoic Evolution and Metallogenesis

引用

Acta Geologica Sinica(English Edition) 2000年第3期74卷 452-457页

作者： SHAO Shicai Beijing Institute of Geology for Mineral Resources BeiyuanAndingmenwaiBeijing 100012

The formation, development and evolution of the qinling orogenic belt can be divided into three stages: (1) formation and development of Precambrian basement in the Late Archaean-Palaeoproterozoic (3.0–1.6 Ga), (2) p... 详细信息

关键词： qinling orogenic belt evolution metallogenesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Xiba Granitic Pluton in the qinling orogenic belt, Central China: Its Petrogenesis and Tectonic Implications

引用

Acta Geologica Sinica(English Edition) 2012年第5期86卷 1128-1142页

作者： ZHANG Fan LIU Shuwen CHEN Xu LI Qiugen DAI Junzhi YANG Kai WU Fenghui CHEN Youzhang The Key Laboratory of orogenic belts and Crustal Evolution MOEPeking UniversityBeijing 100871 Northwest Bureau of Geological Exploration of China National Nonferrous Metals Industry Corporation Xi'anShaanxi 710054

Xiba granitic pluton is located in South qinling tectonic domain of the qinling orogenic belt and consists mainly of granodiorite and monzogranite with significant number of microgranular quartz dioritic enclaves. SHRIMP zircon U-Pb isotopic dating reveals that the quartz dioritic enclaves formed at 214±3 Ma, which is similar to the age of their host monzogranite （218±1 Ma）. The granitoids belong to high-K calc-alkaline series, and are characterized by enriched LILEs relative to HFSEs with negative Nb, Ta and Ti anomalies, and right-declined REE patterns with （La/Yb） N ratios ranging from 15.83 to 26.47 and δEu values from 0.78 to 1.22 （mean= 0.97）. Most of these samples from Xiba granitic pluton exhibit εNd（t） values of 8.79 to 5.38, depleted mantle Nd model ages （T DM ） between 1.1 Ga and 1.7 Ga, and initial Sr isotopic ratios （ 87 Sr/ 86 Sr） i from 0.7061 to 0.7082, indicating a possible Meso-to Paleoproterozoic lower crust source region, with exception of samples XB01-2-1 and XB10-1 displaying higher （ 87 Sr/ 86 Sr） i values of 0.779 and 0.735, respectively, which suggests a contamination of the upper crustal materials. Quartz dioritic enclaves are interpreted as the result of rapid crystallization fractionation during the parent magmatic emplacement, as evidenced by similar age, texture, geochemical, and Sr-Nd isotopic features with their host rocks. Characteristics of the petrological and geochemical data reveal that the parent magma of Xiba granitoids was produced by a magma mingling process. The upwelling asthenosphere caused a high heat flow and the mafic magma was underplated into the bottom of the lower continent crust, which caused the partial melting of the lower continent crustal materials. This geodynamic process generated the mixing parent magma between mafic magma from depleted mantle and felsic magma derived from the lower continent crust. Integrated petrogenesis and tectonic discrimination with regional tectonic evolution of the qinling orogen, it is suggested that the granitoids are most likel

关键词： Xiba granitoids SHRIMP U-Pb ages geochemistry and Sr-Nd isotopic systematics petrogenesis and tectonic implication qinling orogenic belt

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

In Situ Rb-Sr Dates of Muscovite and Sulfur Isotope of Pyrite from the Yangshan Gold Deposit in Western qinling,China

引用

Acta Geologica Sinica(English Edition) 2023年第5期97卷 1475-1489页

作者： HUANG Yong QI Xianmao WU Qingsong LI Jianzhong REN Minghua DUAN Liu’an XIONG Tao YANG Zhonghu ZHAO Yang CIREN Lamu WEI Wei DUAN Jilin YAN Mengmeng Civil-Military Integration Center of China Geological Survey Chengdu 610036China China University of Geosciences Wuhan 430074China Department of Geoscience University of NevadaLas Vegas 89154-4010USA Yantai Geological Survey Center of Coastal Zone China Geological SurveyYantaiShandong 264000China East China University of Technology Nanchang 330013China

Located along the southern part of the West qinling orogenic belt,the Yangshan gold deposit is one of the largest in China.The major gold ores of Yangshan are disseminated in metasedimentary host rocks with minor native gold amounts in stibnite-gold quartz veins.Pyrite and arsenopyrite are the major Au-bearing minerals.Hydrothermal muscovite from gold-bearing quartz veins was dated using the in situ Rb-Sr method to determine the formation age of the Yangshan gold deposit.The Rb-Sr isochron date of the muscovite yielded 210.1±5.6 Ma(MSWD=1.2).This date is near the lower end of the period of the mineralized granitic dykes(210.49-213.10 Ma).Two stages of gold enriching process are recognized in the gold-bearing pyrite:the first is incorporated with the Co,Cu,As,Ni enrichment;and the second is accompanied by Bi,Co,Ni,Pb,Cu,Sb concentration.The in-situ sulfur isotopic values of pyrites show a restrictedΔ34s range of-1.43‰to 2.86‰with a mean value of 0.43‰.Trace-element mapping and in-situ sulfur isotopic analysis of pyrite suggest that the sulfur deposits are likely derived from a magmatic source and likely assimilated by sulfur from the sedimentary bedrock.Thus,magmatism plays a critical role in the formation of the Yangshan gold deposit.

关键词： Rb-Sr dating trace-element mapping sulfur isotope gold deposit Yangshan qinling orogenic belt

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The effects of the source composition on the origin of orthopyroxenebearing adakitic granitoid in West qinling,Central China

引用

Geoscience Frontiers 2023年第3期14卷 180-200页

作者： Yuanhui Xie Xiaowei Li Xuanxue Mo Guochen Dong Yuqin Sun Wei Shan State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Sciences and ResourcesChina University of Geosciences(Beijing)Beijing 100083China Shandong Institute of Geological Sciences and Key Laboratory of Gold Mineralization Processes and Resource UtilizationJinan 250013China

Orthopyroxene-bearing granodiorite(sometimes referred to as‘charnockite’)with an adakitic affinity is a rare type of granitoid.It is generally accepted that the stabilization of orthopyroxene in igneous charnockites essentially requires low aH_(2)O and/or high temperatures in a closed system.However,orthopyroxene can be an antecryst in a trans-crustal magmatic system.In this regard,orthopyroxenebearing granitoids are somewhat analogous to pseudo-charnockites,where the orthopyroxene stems from a mafic reservoir.On the other hand,the source compositions of continental adakites can vary,which is often ignored in the interpretation of their contribution to the adakitic geochemical signature.In this study,we have investigated a rare orthopyroxene-bearing felsic pluton from the Zhuyuan area of West qinling,Central China.The Zhuyuan pluton was emplaced in the Middle–Late Triassic(222–217 Ma)and is mainly composed of metaluminous to weakly peraluminous granodiorites belonging to the high-K calc-alkaline series.Moreover,they are characterized by high Mg#values(49.7–60.9)and Sr contents(471–697 ppm),low Y(12.2–15.4 ppm)and Yb(1.03–1.24 ppm)contents,high Sr/Y(33.2–46.2)and(La/Yb)_(N)(15.3–21.4)ratios,and weakly negative Eu anomalies(Eu/Eu^(*)=0.78–0.89).The Zhuyuan adakitic granodiorites exhibit fairly limited Sr–Nd–Pb isotopic ratios and variable zircon initial Hf isotopes,indicating a major contribution from the Neoproterozoic basement of the qinling orogenic belt.There is no evidence of any formation through high-pressure magmatic processes,and we propose that the adakitic signature of the Zhuyuan pluton could have been inherited from its source rocks(i.e.,from the Neoproterozoic basement).The orthopyroxenes in the Zhuyuan granodiorites display poikilitic textures with high MgO,NiO and Cr_(2)O_(3) contents,indicating that they have an antecrystic origin.Studies of regional tectonic evolution have shown that the Zhuyuan granodiorites formed during the tearing stage of the A’nimaque–Mianlue oceanic subduction slab.Therefor

关键词： qinling orogenic belt Adakitic rock Orthopyroxene-bearing granodiorite Pseudo-charnockite

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tectonic Boundary and Ceasing Time of Amalgamation between the North China Craton and the North qinling belt

引用

Journal of Earth Science 2018年第5期29卷 1074-1080页

作者： Jingbo Liu Neng-Song Chen Wen Su State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth and Planetary Sciences University of the Chinese Academy of Sciences School of Earth Sciences Center for Global Tectonics China University of GeosciencesWuhan

The qinling orogenic belt is a composite orogen, consisting of the north and south qinling belts with different collision ages. The North qinling belt is composed of several petro-tectonic units, including the Kuanping, Erlangping, qinling and Danfeng groups with numerous granitoid plutons from Neoproterzoic to Middle Devonian. To the north of the Kuanping Group, a mylonitized granite body in the Luanchuan Group was determined to have the magmatic age of 850 Ma, which is the northernmost Neoprotozoic granite body. The volcanic rocks of the Dahongkou Formation from the Luanchuan Group had the eruptive age of -1 600 Ma, obtained from zircon U-Pb LA-ICP-MS analysis. The detrital zircons in meta-sandstones from the Taowan Group have three populations of-920-1 400, -1 600-2 100, and 〉2 200 Ma ages, whereas those from the Kuanping Group shows six populations with the peaks of -590, -767, -952, -1 590, -2 485, and -3 200 Ma. These data suggest that the boundary between the North China Craton and the North qinling belt cannot simply be constrained by using the events determined from zircon U-Pb ages. The granitoid plutons with the magmatic age of 430 Ma were strongly deformed, while those with the magmatic age of -390 Ma show no or less deformation, indicating that the deformation of amalgamation between the North China Craton and the North qinling belt ceased between 390 and 430 Ma.

关键词： qinling orogenic belt Taowan Group Kuanping Group granitoid zircon age.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

New　Evidence　for　Eastward　Extension　of　Late　Hercynian－Early　Indosinian　qinling　Sea

引用

Journal of Earth Science 1996年第2期15卷 141-146页

作者： Du Yuansheng Feng Qinglai Yin Hongfu(Faculty of Earth Sciences, China Universily of Geosciences, Wuhan 430074)Zhang Zongheng Zeng Xianyou(Third Geological Survey Team of Henan Province, Xinyang 464000)

The problem of the eastward extension of qinling sea of Late Hercynian -Early Indosinian has always been in suspension. The present paper makes an assumption that the qinling rock-group should be a tectonic complex consisting of complicated structural slices of different ages according to the new discovery of radiolarias and other faunas in the Yanlinggou rock-formation in the area around eastern qinling-Toughai Mountains. The discovery of the Early Triassic radiolarias in Tongbai Mountain and the analysis of the paleogeography of the Yangtze and North China plate margins indicate the existence of eastern qinling-Tongbai-Dabie sea of Late Hercynian-Early Indosinian, which is considered to be the eastward extension of the western qinling rift trough. The rift trough was closed by the convergent collision between the Yangtze and North China plates in Middle to Late Triassic.

关键词： qinling orogenic belt Triassic sea radiolaria qinling rock-group

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Metamorphic and Deformational History of a Continental Collision Zone and its Geodynamic Process——as Evidenced by qinling Complex,Western Henan,China

引用

Journal of Earth Science 1990年第1期9卷 62-76页

作者： You Zhendong Han Yujing Suo Shutian Chen Nensong Zhong ZenqiuDepartment of Geology, China University of Geosciences, Wuhan 430074

The qinling orogenic belt is a collision zone between the North China and Yangtze cratons. The qinling Complex is a Precambrian metamorphic complex, developed in the inner zone of the orogenic belt , which records the metamorphic and deformational history and PTt path of the regional meta-morphism of the collision zone . The present paper studies the metamorphic and deformational history and the PTt path of various tectono-metamorphic cycles in order to describe the geodynamic processes prevailing in that part of the qinling orogenic belt since Proterozoic.The tectonometamorphic history and evolution of the qinling Complex is divided into two stages: the stage of formation and the stage of modification During the stage of formation dated as Proterozoic,three deformational sequences are recognized. The amphibolite facies regional metamorphism is earlier than or synchronous with the first or second phase of folding. Three metamorphic zones, i.e. And-Ms ,Sil- Ms, Sil Kfs are delimited. During the stage of modification , the emplacement of Caledonian granite , superimposed thermal aureole (garnet K feldspar zone )and the development of ductile shear zones are major events.Metamorphic reactions are reconstructed in terms of analysis of re-equilibrium textures. Geothermobarometric calculations are conducted to calibrate the PT conditions of metamorphism .The metamorphic PTt paths have been estabh'shed. The PTt path of the Proterozoic tectonometamorphic cycle shows a clockwise pattern and is characterized by prominent decompression. The PTt path of the Caledonian tectonometamorphic cycle is characterized first by PT rising ,then isothermal decompression (rapid uplift), and finally by isobaric cooling The PTt path of the two tectonometamorphic cycles evidence the geodynamic processes: two major stages of collision and uplift in the Proterozoic and Caledonian Hercynian periods, respectively, during the evolution of qinling orogenic belt.

关键词： qinling orogenic belt metamorphic history ,tectonomet- am orphic cycle PTt path geodynamic processes .

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

秦岭中段及其相邻区域S波速度结构研究

引用

国际地震动态 2004年第Z1期25卷 70-页

作者：张学民刁桂苓束沛镒王为民中国地质大学地球物理与信息技术学院北京100083 河北省地震局石家庄050021 河北省地震局石家庄050021 中国科学院地质与地球物理研究所北京100029

　　利用纯S波波形拟合方法,输入纯S波波形,使用传递矩阵计算了层状介质自底面传到地表约100 km厚度、32 s的理论地震波形;引进快速模拟退火法进行反演搜索理想模型,用理论波形与观测波形的相关系数作为约束函数,选择同一台站几个震例... 详细信息

　　利用纯S波波形拟合方法,输入纯S波波形,使用传递矩阵计算了层状介质自底面传到地表约100 km厚度、32 s的理论地震波形;引进快速模拟退火法进行反演搜索理想模型,用理论波形与观测波形的相关系数作为约束函数,选择同一台站几个震例的理论波形与实际波形吻合最好的模型作为该台站下方的可接受速度结构模型.收集深源远震的清晰S波记录波形,我们共得到了陕西省境内秦岭造山带中段及其邻近区域13个地震台站下方的S波速度结构.结果显示,秦岭造山地带、渭河盆地及鄂尔多斯块体的地壳结构之间存在很大的差异,各个块体有其各自的构造特点;不过三个块体的地壳厚度都显示了由东向西逐渐增加的变化趋势.……

关键词：秦岭中段相邻区域波速度结构研究 qinling orogenic belt 记录波形速度结构模型秦岭造山带地震台站理论鄂尔多斯块体模拟退火法约束函数相关系数显示渭河盆地深源远震拟合方法理想模型矩阵计算

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：