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长江中下游成矿带南陵—宣城矿集区中生代构造—岩浆—成矿特征及其地质意义

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地质论评 2024年第5期70卷 1639-1659页

作者：徐晓春金林森许心悦谢巧勤夏彩莲合肥工业大学资源与环境工程学院合肥230009 阿尔伯塔大学地球与大气科学学院加拿大埃德蒙顿T6G 2E3

安徽南陵—宣城矿集区是长江中下游成矿带中一个新确立的矿集区,近年来找矿勘查工作取得重要进展。笔者等在广泛收集以往区域地质调查以及最新地球物理探测和矿床地质勘查成果的基础上,系统总结了矿集区地质构造、岩浆岩和铜多金属矿床... 详细信息

安徽南陵—宣城矿集区是长江中下游成矿带中一个新确立的矿集区,近年来找矿勘查工作取得重要进展。笔者等在广泛收集以往区域地质调查以及最新地球物理探测和矿床地质勘查成果的基础上,系统总结了矿集区地质构造、岩浆岩和铜多金属矿床的地质和地球化学特征,探讨了中生代时期区域构造作用与岩浆作用和成矿作用的相互关系。研究认为,南陵—宣城矿集区构造上为一个受深大断裂控制的中生代—新生代陆相凹陷—断陷火山—沉积盆地,盆地之上叠置古生代地层构成的NE向指状展布的复背斜/逆冲推覆体,盆地基底地层组成和构造特征与盆地之上叠置的复背斜/逆冲推覆体基本一致,且两者均发育相同时代和特征的侵入岩及相关铜多金属矿床。南陵—宣城矿集区构造—岩浆—成矿特征总体上与长江中下游成矿带其他地区基本一致,反映自中生代以来受古太平洋板块向欧亚板块之下俯冲作用的控制,经历了强烈的陆内变形改造以及相应的多期次NW—SE向挤压作用和拉张作用。南陵—宣城矿集区构造—岩浆—成矿特征同时又具有其独特性,表现在其地质构造格架、侵入岩和矿床特征与长江中下游成矿带其他火山—沉积盆地明显不同,反映其在区域构造空间以及地壳基底结构和组成上的差异,同时揭示南陵—宣城矿集区是长江中下游成矿带跨构造单元复合系统的典型代表。

关键词：地质构造格架成岩成矿特征长江中下游成矿带江南隆起带南陵—宣城矿集区

Evidence from pseudomorphous β-quartz phenocryst for decompression of rock-forming and ore-forming processes in Shapinggou porphyry Mo deposit

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Science China Earth Sciences 2016年第5期59卷 1014-1024页

作者： HE Jun XU XiaoChun xie qiaoqin FAN ZiLiang CHEN TianHu School of Resources and Environmental Engineering Hefei University of Technology Laboratory for Nanomineralogy & Environmental Material Hefei University of Technology

The Shapinggou porphyry molybdenum(Mo) deposit, located in Jinzhai County, Anhui Province, China, is the largest in the Qinling-Dabie Mo Metallogenic Belt. The intrusive rocks in the Shapinggou Mo ore district formed in the Yanshanian can be divided into two stages based on zircon U-Pb dating and geochemical features. This study focuses on the late stage intrusions(quartz syenite and granite porphyry), which are closely genetically related to molybdenum mineralization. Petrographic observations identified two quartz polymorphs in the quartz syenite and granite porphyry, which were derived from the same magmatic sources and similar evolutionary processes. The quartzes were identified as a xenomorphic β-quartz within quartz syenite, while the quartz phenocrysts within the granite porphyry were pseudomorphous b-quartz, characterized by a hexagonal bipyramid crystallography. The pseudomorphous b-quartz phenocrysts within the granite porphyry were altered from b-quartz through phase transformation. These crystals retained b-quartz pseudomorph. Combined with titanium-inzircon thermometry, quartz phase diagrams, and granitic Q-Ab-Or-H_2O phase diagrams, it is suggested that the quartz syenite and granite porphyry were formed under similar magmatic origins, including similar depths and magmatic crystallization temperatures. However, the β-quartz within quartz syenite indicated that the crystallization pressure was greater than 0.7 GPa, while the original b-quartz within the granite porphyry was formed under pressures between 0.4 and 0.7 GPa. The groundmass of the granite porphyry which formed after the phenocryst indicated a crystallizing pressure below 0.05 GPa. This indicates that the granite porphyry was formed under repetitive and rapid decompression. The decompression was significant as it caused the exsolution of the ore-forming fluids, and boiling and material precipitation during the magmatic-fluid process. The volumetric difference during the phase transformation f

关键词： Porphyry Mo deposit Pseudomorphous β-quartz Decompression mechanism Rock-forming and ore-forming processes Shapinggou Mo deposit

铜陵地区晚泥盆世五通组叶腊石的发现及其资源意义

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高校地质学报 2024年第2期30卷 157-164页

作者：刘童谢巧勤徐亮王家宇周跃飞陈天虎徐晓春合肥工业大学资源与环境工程学院纳米矿物与污染控制安徽普通高校重点实验室合肥230009

叶山铁矿是铜陵新桥矿田一小型沉积—热液叠加改造型铁矿床。文章采用粉晶X射线衍射(XRD)、扫描电子显微镜(SEM)等研究手段,对叶山铁矿区内晚泥盆世五通组沉积岩进行系统矿物学研究。结果发现,五通组碎屑岩中除了常见的碎屑矿物石英、... 详细信息

叶山铁矿是铜陵新桥矿田一小型沉积—热液叠加改造型铁矿床。文章采用粉晶X射线衍射(XRD)、扫描电子显微镜(SEM)等研究手段,对叶山铁矿区内晚泥盆世五通组沉积岩进行系统矿物学研究。结果发现,五通组碎屑岩中除了常见的碎屑矿物石英、长石、伊利石和高岭石,还含有大量叶腊石,伴生一定量赤铁矿和针铁矿。XRD定量显示叶腊石含量介于7.54%~70%,且沉积层中部为叶腊石富集层位,其含量皆高于50%。微结构观察发现叶腊石多呈自形—半自形的块状、板条状形态,多环绕石英颗粒生长,甚至有的颗粒已经完全由片状叶腊石组成,但是仍具有石英棱柱状形态的假象结构。化学成分分析显示,岩石样品SiO_(2)含量较高,介于44.47%~80.23%,Al_(2)O_(3)含量介于10.49%~28.75%。根据矿物组成和化学成分特征,铜陵叶山矿区五通组沉积岩已经具有叶腊石矿石品质,矿石类型属于硅铝质叶腊石,这种叶腊石矿石是陶瓷原料、耐火材料、无碱玻璃等重要原料。矿石微结构观察和矿区地质背景综合研究显示,五通组叶腊石可能为区域中生代岩浆热作用下高岭石和石英再活化产物。该研究成果为铜陵乃至长江中下游成矿带内具备类似地质条件、寻找非金属叶腊石粘土矿物资源提供基础矿物学理论支撑。

关键词：铜陵地区五通组叶腊石矿石成因类型非金属资源

Acid Mine Drainage and Heavy Metal Pollution from Solid Waste in the Tongling Mines, China

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Acta Geologica Sinica(English Edition) 2008年第1期82卷 146-153页

作者： XUXiaochun xie qiaoqin CHEN Fang WANG Jun WU Wentao School of Resources and Environment Engineering Hefei University of Technology Hefei 230009 China

Based on investigation of the characteristics of solid waste of two different mines, the Fenghuangshan copper mine and the Xinqiao pyrite mine in Tongling, Anhui province in central-east China, the possibility and the differences of acid mine drainage （AMD） of the railings and the waste rocks are discussed, and the modes of occurrence of heavy metal elements in the mine solid waste are also studied. The Fenghuangshan copper mine hardly produces AMD, whereas the Xinqiao pyrite mine does and there are also differences in the modes of occurrence of heavy metal elements in the railings. For the former, toxic heavy metals such as Cu, Pb, Zn, Cd, As and Hg exist mostly in the slag mode, as compared to the latter, where the deoxidization mode has a much higher content, indicating that large amounts minerals in the waste rocks have begun to oxidize at the earth surface. AMD is proved to promote the migration and spread of the heavy metals in mining waste rocks and lead to environmental pollution of the surroundings of the mine area.

关键词： acid mine drainage heavy metal pollution solid waste Tongling Anhui province China

铜陵新桥层状菱铁矿成因的矿物学证据及成矿意义

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地质科学 2024年第2期59卷 498-509页

作者：谢巧勤胡雨王家宇马子意徐亮周跃飞陈天虎徐晓春纳米矿物与污染控制安徽普通高校重点实验室合肥工业大学资源与环境工程学院合肥230009 安徽省地质矿产勘查局321地质队安徽铜陵244033 中国科学院广州地球化学研究所矿物学与成矿学重点实验室广州510640

安徽铜陵新桥矿区二叠系栖霞组底部和石炭系黄龙组—船山组之间产出层状、似层状菱铁矿矿层。开展菱铁矿矿层成因研究对于深入剖析区域层控矽卡岩型铜铁矿床成矿机制具有重要意义。本文利用粉晶X射线衍射(XRD)、扫描电镜(SEM)对菱铁矿... 详细信息

安徽铜陵新桥矿区二叠系栖霞组底部和石炭系黄龙组—船山组之间产出层状、似层状菱铁矿矿层。开展菱铁矿矿层成因研究对于深入剖析区域层控矽卡岩型铜铁矿床成矿机制具有重要意义。本文利用粉晶X射线衍射(XRD)、扫描电镜(SEM)对菱铁矿矿石进行矿物学研究,结果发现菱铁矿矿石主要由菱铁矿、石英、伊利石和有机质等组成,菱铁矿颗粒粒径较小,表面具有成岩自生的自形石英硬模的微结构,SEM原位微区成分分析显示菱铁矿中除了主量元素铁,还含有大量的锰、锌和钙。矿石中存在两种微结构和不同成因的石英:表面具菱铁矿硬模和次生加大结构的碎屑石英;具六方双锥、单锥以及生物成因球形的自生石英。菱铁矿矿石的组成和矿物表面微结构表明其为沉积成因,非岩浆热液起源。富有机质和亚铁的沉积菱铁矿层和沉积胶状黄铁矿层协同作用,可能是铜陵地区乃至长江中下游成矿带层状铜铁矿床层控性重要制约因素,以及可能作为燕山期中酸岩浆演化的氧化性含铜成矿流体卸载成矿的地球化学还原障。

关键词：新桥矿床菱铁矿层成因矿物学碎屑石英层控机制

Genesis of Strata-bound Sulfide Orebodies in the Tongling Polymetallic Mineralization Cluster, SE China: Evidence from Colloform Pyrite

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Acta Geologica Sinica(English Edition) 2020年第6期94卷 1849-1859页

作者： XU Liang xie qiaoqin CHEN Tianhu XU Xiaochun ZHOU Yuefei SUN Shaohua CHEN Ping School of Resource and Environmental Engineering Hefei University of TechnologyHefei 230009China

Colloform pyrite(CPy)is widely distributed in the Tongling mineralization cluster of the Middle-Lower Yangtze River Mineralization Belt(MLYRMB),*** have many debates as to whether such CPy is associated with Late Mesozoic igneous or Carboniferous *** from the Xinqiao deposit,a representative of the stratabound sulfide deposits in the MLYRMB,was studied by powder X-ray diffraction(XRD),field-emission scanning electron microscopy(SEM),and high-resolution transmission electron microscopy(TEM).The results show that CPy mainly comprises pyrite,pyrrhotite,quartz,and *** in CPy shows cubic,globule,and xenomorphic *** octahedral or pyritohedron was *** of the quartz crystals display xenomorphic morphology,where pyrite mold are popular on the *** matter(OM),which is usually bound to illite,is an important component in *** investigations which exhibit detrital features of quartz and clay minerals indicate that they were derived from continental ***,some hexagonal pyrrhotite nanoparticles which show mackinawite morphology are coexisted with *** results indicate that the transformation process of sulfides possibly is mackinawite(the precursor)—hexagonal ***,compositional and micro-textural characteristics of CPy in Xinqiao deposit suggest it to be a sedimentary origin rather than a hydrothermal origin which is associated with Yanshanian ***,the coexistence of CPy and stratabound sulfide orebodies in the MLYRMB suggests a causal link between the *** is considered that CPy might have served as a Cu mineralization geochemical barrier for the Cu-bearing ore-forming fluids,which originated from the Mesozoic magma in the MLYRMB.

关键词： nano-mineralogy colloform pyrite organic matter Xinqiao sulfide deposit Yangtze metallogenic belt Anhui Province

早期成岩条件下有孔虫壳体矿物稳定性:模拟实验的启示

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高校地质学报 2024年第4期30卷 431-441页

作者：阚立波周跃飞李晓松王家宇徐亮谢巧勤陈天虎纳米矿物与污染控制安徽普通高校重点实验室合肥工业大学资源与环境工程学院合肥230009

为了模拟早期成岩条件下钙质壳有孔虫壳体中碳酸盐矿物的稳定性及分解转化,文章对浙江台州大港湾滩涂沉积物中的优美小九字虫(Nonionella decora,CF1)、奥茅卷转虫(Ammonia aomoriensis,CF2)和暖水卷转虫(Ammonia tepida,CF3)壳体在硫... 详细信息

为了模拟早期成岩条件下钙质壳有孔虫壳体中碳酸盐矿物的稳定性及分解转化,文章对浙江台州大港湾滩涂沉积物中的优美小九字虫(Nonionella decora,CF1)、奥茅卷转虫(Ammonia aomoriensis,CF2)和暖水卷转虫(Ammonia tepida,CF3)壳体在硫离子、异化铁还原菌(dissimilatory iron-reducing bacterium,DIRB)和硫酸盐还原菌(sulfate-reducing bacterium,SRB)作用下的形貌、结构和成分变化进行了分析。结果表明,初始S^(2-)≥64 mmol/L时,S^(2-)可以显著促进CF1和CF3壳体中方解石的溶解;对CF2,初始S^(2-)≥128 mmol/L时溶蚀现象明显;溶蚀作用主要发生在壳体表面锯齿构造位置。DIRB对三种有孔虫壳体中的方解石均产生强烈溶解作用,SRB对方解石的溶解无明显促进作用。S^(2-)作用不改变方解石Raman光谱特征,DIRB和SRB作用导致其Raman光谱整体发生5~7 cm^(-1)的移动。S^(2-)、DIRB及SRB作用均可促进壳体内部矿物的溶解和Mg的均一化,DIRB和SRB的代谢产物同时可以促进壳体中次生富Mg碳酸盐矿物的生成。研究认为,早期成岩环境中的DIRB对有孔虫壳体成分和结构的改变强于S^(2-)和SRB,但在长时间尺度上,SRB的作用也不可忽略。

关键词：有孔虫壳体早期成岩作用方解石分解

Genetic Types and Metallogenic Model for the Polymetallic Copper–Gold Deposits in the Tongling Ore District, Anhui Province, Eastern China

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Acta Geologica Sinica(English Edition) 2019年第1期93卷 88-110页

作者： FU Zhongyang XU Xiaochun HE Jun FAN Ziliang xie qiaoqin DU Jianguo CHEN Fang School of Resources and Environmental Engineering Hefei University of Technology Geological Survey of Anhui Province

The Tongling ore district is one of the most economically important ore areas in the Middle–Lower Yangtze River Metallogenic Belt, eastern China. It contains hundreds of polymetallic copper–gold deposits and occurrences. Those deposits are mainly clustered(from west to east) within the Tongguanshan, Shizishan, Xinqiao, Fenghuangshan, and Shatanjiao orefields. Until recently, the majority of these deposits were thought to be skarn-or porphyry–skarn-type deposits; however there have been recent discoveries of numerous vein-type Au, Ag, and Pb-Zn deposits that do not fall into either of these categories. This indicates that there is some uncertainty over this classification. Here, we present the results of several systematic geological studies of representative deposits in the Tongling ore district. From investigation of the ore-controlling structures, lithology of the host rock, mineral assemblages, and the characteristics of the mineralization and alteration within these deposits, three genetic types of deposits(skarn-, porphyry-, and vein-type deposits) have been identified. The spatial and temporal relationships between the orebodies and Yanshanian intrusions combined with the sources of the ore-forming fluids and metals, as well as the geodynamic setting of this ore district, indicate that all three deposit types are genetically related each other and constitute a magmatic–hydrothermal system. This study outlines a model that relates the polymetallic copper–gold porphyry-, skarn-, and vein-type deposits within the Tongling ore district. This model provides a theoretical basis to guide exploration for deep-seated and concealed porphyry-type Cu(–Mo, –Au) deposits as well as shallow vein-type Au, Ag, and Pb–Zn deposits in this area and elsewhere.

关键词： polymetallic copper–gold deposits genetic types metallogenic model magmatic–hydrothermal system Tongling ore district Anhui Province

Distribution of Palygorskite in the Lingtai Profile of Chinese Loess Plateau:Its Paleoclimatic Implications

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Acta Geologica Sinica(English Edition) 2008年第5期82卷 967-974页

作者： xie qiaoqin CHEN Tianhu CHEN Jun JI Junfeng XU Huifang XU Xiaochun School of Resources and Environment Engineering Hefei University of Technology Hefei Anhui 230009 China Department ofGeoscience Nanjing University Nanjing Jiangsu 210093 China Department of Geology and Geophysics University of Wisconsin Madison W153706 USA

Palygorskite is a typical indicator mineral of the arid and strong evaporation environment. Distribution of palygorskite in loess-red clay sequences may act as an important indicator for reconstruction of the paleoenvironment and paleoclimate. In this paper, field emission scanning electron microscope and high-resolution transmission electron microscope observations on the red clay-loess-paleosol of the Renjiapo profile at Lingtai, Gansu Province indicate that palygorskite occurs widely in red clay sequences formed before 3.6 Ma, but no occurrence has been found in eolian sediments since 3.2 Ma. Micromorphological features and microstructure of palygorskite show that it is an autogenic mineral formed during pedogenesis, and transformed from iilite-montmorilionite under the pore water action. In the Lingtai profile, the disappearance horizon of palygorskite is consistent with those of increasing magnetic susceptibility, dust flux and depositional rate. The distribution of palygorskite in the profile indicates that the interval of around 3.6 Ma was an important transformation period of the East Asian paleomonsoon, when changes took place in the East Asia paleoclimate pattern, i.e. a high-frequency strong fluctuation alternative evolution of the environment. Therefore, palygorskite is a key indicator mineral of the East Asian paleomonsoon evolution of that time.

关键词： palygorskite paleoclimate Lingtai loess-red clay sequence