|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 福建龙岩大洋-莒舟花岗岩地球化学、年代学、铪同位素特征及其地质意义显示文摘为了揭示闽西南龙岩地区大洋、莒舟花岗岩体的成因、侵位时代及其与成矿的关系,在岩石学、地球化学研究基础上,利用LA-MC-ICPMS锆石U-Pb、Lu-Hf同位素测试方法对上述岩体进行年龄测定及铪同位素示踪。岩石学特征表明大洋、莒舟岩体具有多期次侵入特征,岩性主要为花岗岩、似斑状花岗岩以及花岗闪长岩。大洋岩体花岗闪长岩的年龄为(136.2±0.9)Ma,细粒花岗岩的年龄为(125.0±1.7)Ma,似斑状花岗岩的年龄为(132.0±0.2)Ma,菖舟似斑状花岗岩的年龄为(132.4±0.8)Ma。岩石地球化学成分上具有富硅、富铝、低钛、高钾钙碱性特征,富集大离子亲石元素(K、Rb、Cs、Pb等),亏损高场强元素(Nb、Ta、Zr、Ce、Ti等),微量元素表现出后造山伸展背景的特征。稀土含量较低,总稀土含量分别为92.76×10^-6-176.26×10^-6和116.63×10^-6-213.95×10^-6,具有显著的负铕异常(δEu=0.01-0.54)和稀土分布模式差异性特征。总体上具有较高的Na2O+K2O值、Ga/Al值及Rb含量,低Zr含量,具有高分异Ⅰ型花岗岩成因特征。两个代表性样品锆石铀εHf(t)值分别为-16.47--5.95和-11.05--3.35,对应的二阶段模式年龄分别为1567~2221Ma和1400~1889Ma,来源于古元古一中元古代地壳物质重熔。在以上研究基础上,讨论了两个岩体的成因及其所代表的构造环境,进而探讨了大洋、莒舟花岗岩与成矿的关系。 | 王森 张达 Absai Vatuva 闫鹏程 马帅 冯海滨 宇腾达 白昱 狄永军 | 2015 | 地球化学2015，44，5： | 16 |
| 2 | 闽西南晚古生代以来伸展构造演化:中基性岩墙群的年代学、地球化学制约显示文摘为了深入探讨闽西南地区晚古生代以来的伸展构造演化特征,在岩石地球化学研究基础上,利用LA-ICP-MS锆石U-Pb定年方法对闽西南龙岩一带中基性岩墙群进行年龄测定。地球化学特征表明,该岩墙群属于钙碱性系列,主量元素以低TiO2(0.99%~1.73%)、高Al2O3(13.80%~15.76%)、高K2O(0.59%~4.42%)、K2O〉Na2O为特征;富集轻稀土元素(LREE)及大离子亲石元素(LILE,如Rb, Ba, Th, K等),亏损高场强元素(HFSE,如Nb, Ta, Zr等)。锆石U-Pb测年结果表明,两期代表性岩墙分别形成于316 Ma和141 Ma,属于晚古生代中晚期和中生代晚期。本文运用构造环境判别方法,并结合沉积古地理特征,认为早期辉绿岩(316 Ma)可能形成于被动大陆边缘的板内拉张环境,晚期辉绿岩(141 Ma)可能形成于板块俯冲之后的火山弧?伸展的过渡环境。在以上研究基础上,讨论了闽西南地区晚古生代以来经历的构造演化阶段,即晚泥盆世?早三叠世伸展,中?晚三叠世印支运动挤压,早?中侏罗世古特提斯构造域向燕山期太平洋构造域转换,以及晚侏罗世末?早白垩世大规模伸展等主要阶段。 | 王森 张达 吕良冀 ABSAI Vatuva 狄永军 闫鹏程 林全胜 张林阔 马帅 袁远 | 2015 | 大地构造与成矿学2015，39，5： | 11 |
| 3 | Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes显示文摘The tectonic evolution of SE China block since late Paleozoic remains debated.Here we present a new set of zircon U-Pb geochronological,Lu-Hf isotopic data and whole-rock geochemistry for two stages of basicintermediate dykes from the southwestern Fujian.The samples were collected from the NE-trending(mainly diabases) and NW-trending(mainly diabasic diorites) dykes and yielded zircon U-Pb ages of 315 and 141 Ma,with ε_(Hf)(t) values of-8.90 to 7.49 and-23.39 to-7.15(corresponding to T_(DM2) values of 850 to 1890 Ma and 737 to 2670 Ma),respectively.Geochemically these rocks are characterized by low TiO_2(0.91-1.73 wt.%)and MgO(3.04-7.96 wt.%),and high Al_2O_3(12.5-16.60 wt.%) and K_2O(0.60-3.63 wt.%).Further they are enriched in LREEs and ULEs(Rb,Ba,Th and K).but depleted in HFSEs(Nb,Ta and Zr).The tectonic discrimination analysis revealed that the dykes were formed in an intraplate extensional environment.However,the NW trending dykes show crust-mantle mixed composition,which indicate an extensional tectonic setting with evidence for crustal contamination.The SE China block experienced two main stages of extensional tectonics from late Carboniferous to early Cretaceous.The tectonic evolution of the SE China block from late Devonian to Cretaceous is also evaluated. | Sen Wang Da Zhang Ganguo Wu Absai Vatuva Yongjun Di Pengcheng Yan Haibin Feng Shuai Ma | 2017 | Geoscience Frontiers2017，8，3： | 6 |
| 4 | Late Mesozoic Tectonic Evolution of Southwestern Fujian Province,South China:Constraints from Magnetic Fabric,Zircon U-Pb Geochronology and Structural Deformation显示文摘A combined study of magnetic fabrics, zircon U-Pb geochronology and structural deformation was carried out for Late Paleozoic sedimentary and Mesozoic magmatic rocks in the southwestern Fujian rift basin, South China, aiming at deciphering the tectonic evolution during Late Mesozoic. Field observations showed that the Late Mesozoic structure deformations in southwestern Fujian were categorized into four phases: NW-SE compression, ENE-WSW extension, NNE-SSW compression and NNW-SSE extension, sequentially. Zircons picked out from Juzhou granite and WNW-trending diabase dykes showed complete crystal shapes and clear oscillatory zonings on their edges, and the U-Pb dating yielded ages of 132 and 141 Ma, respectively. The susceptibility ellipsoid magnitude parameters of the Juzhou granite are characterized by flaser type strain ellipsoid, with pole density center of K3 falling into the first and the third quadrants, these features revealed that the Juzhou granite formed in ENE-WSW compressional stress field, indicating the early stage of Early Cretaceous extrusion in southwestern Fujian. The late stage of Early Cretaceous NNE-SSW extension was limited by the widespread WNW-trending diabase dykes, which were usually regarded as important indications for a regional extensional setting. On the basic of the previous researches, structural deformation studies, and the deductions above, it can be concluded that southwestern Fujian experienced five main tectonic stages during Late Mesozoic: Early Jurassic extension, Middle–Late Jurassic thrusting, early stage of Early Cretaceous extension, late stage of Early Cretaceous compression and Late Cretaceous extension. | Sen Wang Da Zhang Ganguo Wu Xingjian Li Xiaoqiao Gao Absai Vatuva Yuan Yuan Tengda Yu Yu Bai Ye Fang | 2018 | Journal of Earth Science2018，29，2： | 4 |
| 5 | 闽西南大排铁铅锌多金属矿床O、S、Pb同位素组成及其成因意义显示文摘对闽西南大排铁铅锌多金属矿床地质特征调查的基础上,分别开展了矿石中主要矿物磁铁矿、石榴子石的O同位素及黄铁矿、闪锌矿和方铅矿的S、Pb同位素测试.结果表明,石榴子石中δ18O值变化范围为3.4‰-6‰,反映了石榴子石矽卡岩可能继承隐伏花岗岩体的O同位素组成;根据磁铁矿的O同位素组成(2.2-4.3‰)所计算的磁铁矿阶段成矿流体的δ18O为9.23‰-11.34‰(500℃)或8.58‰-10.69‰(600℃),暗示有富集δ18O的CO2融入到成矿流体中;矿石硫化物δ“S组成.变化范围较窄,变化范围为-2.6‰-1.5‰,多数集中在0值分布,具有岩浆硫(0±3‰)的特点;硫化物的Pb同位素组成206Pb/204Pb、207Pb/204Pb、208Pb/204Pb的数值分别为18.486-18.537、15.665-15.712、38.823-38.979,变化范围小,整体上具有壳幔混合且以壳源物质为主的特点.结合对闽西南马坑式铁多金属矿床及闽西南花岗岩年代学讨论认为,大排铁铅锌多金属矿床的形成主要与晚中生代花岗岩浆侵入接触交代作用有关.上述认识对于进一步明确闽西南地区铁多金属矿找矿方向具有重要的理论意义. | 冯海滨 张达 狄永军 袁远 Vatuva Absai | 2015 | 地质通报2015，34，5： | 1 |
| 6 | Genesis of Makeng-type Fe-polymetallic deposits in SE China:New constraints by geochronological and isotopic data from the Dapai–Makeng metallogenic system显示文摘The southwestern Fujian depression belt(SFDB)is an economically important Mesozoic Fe metallogenic belt in South China and is renowned for its Makeng-type Fe deposits,in which stratified skarn Fe orebodies generally occur in or near the contact zone between late Paleozoic carbonate sequences and Mesozoic granites.However,the genesis and geodynamic setting of these deposits remain unclear because the characteristics of the widely distributed Pb–Zn–Cu and Mo orebodies in these deposits and the temporal,spatial,and genetic relationships between magmatism and mineralization are poorly defined.The Dapai Fe polymetallic deposit in the SFDB is a typical example of Makeng-type Fe deposits but also has regional significance,whereby the stratified skarn Fe orebodies have overprinted the stratabound Pb–Zn–Cu mineralization followed by final fissure-filling by vein-disseminated Mo mineralization.A detailed geological investigation suggests that episodic magmatic–hydrothermal events were involved in the formation process of the Dapai Fe polymetallic deposit.Pyrite and sphalerite from the Pb–Zn–Cu orebodies yield an Rb–Sr isochron age of 175.5±3.3 Ma,which is regarded as the timing of Pb–Zn–Cu mineralization.Zircon grains from Fe-mineralized granodiorite porphyry and Mo-mineralized monzogranite yield weighted-mean 206Pb/238U ages of 146.3±0.9 Ma and 131.7±0.4 Ma,interpreted as the timings of Fe and Mo mineralization,respectively.Six zircons from granodiorite also yield a 206Pb/238U model age cluster of184 Ma,which coincides reasonably with the timing of Pb–Zn–Cu mineralization and implies the existence of an unidentified ore-related intrusion in the Dapai deposit.Five further zircons from the porphyritic granodiorite yield an age cluster of-150 Ma,consistent with the timing of Fe mineralization.Galena,pyrite,and sphalerite from the Dapai and Makeng deposits have similar S–Pb isotopic compositions and suggest a magmatic source.Combining our results with published isotopic data for the SFDB,we suggest that the Pb–Zn–Cu mineralization in this area was derived from crustal magmas that mixed with mantle-derived magma prior to emplacement.The d56Fe and d57Fe values of magnetite from Dapai and Makeng are both slightly lower than those of the orerelated granites,suggesting that Fe in the initial fluid in both deposits was derived mainly from coeval granitic rocks.The Fe isotopic variation between intrusions and skarn Fe orebodies is interpreted as resulting from mass fractionation that occurred during fluid exsolution from melt.Contents of Re in molybdenite from published data for the SFDB indicate crust–mantle mixed sources of Mo and Re.The Makeng-type Fe polymetallic deposits formed as a result of three magmatic–hydrothermal episodes,generating Pb–Zn–Cu mineralization at 185–160 Ma,Fe–Mo mineralization at 150–140 Ma,and Mo–Fe mineralization at 135–130 Ma.The different metal associations formed during multiple stages of magmatism caused by ongoing subduction and rollback and/or retreat of the paleo-Pacific Plate. | Absai Vatuva Xiaolong He Xinming Zhang Da Zhang Haibin Feng Yuan Yuan Sen Wang Jinjun Yi Yongjun Di | 2023 | Geoscience Frontiers2023，14，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员