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| 1 | 吉林敦化松江河地区中生代似斑状花岗岩成因和形成环境:元素、Hf同位素和锆石U-Pb年代学证据显示文摘花岗岩是陆壳的重要组成部分,它是揭示地壳演化地球动力学过程的主要对象之一。为了揭示夹皮沟—海沟构造带的中生代地质演化,本文系统地开展了该带中段松江河地区花岗岩体内部产出的似斑状花岗岩的野外地质调查、岩相学、单颗粒锆石U-Pb同位素年代学、全岩元素、Hf同位素地球化学的研究。研究结果揭示:岩石呈粉红色、普遍发生较强的糜棱岩化作用,发育糜棱叶理构造;获得岩浆锆石的U-Pb同位素谐和年龄为217~169Ma;加权平均年龄为(169.6±1.8)Ma(n=9,MSWD=1.3);主量元素呈现高硅(71.18%~71.99%)、富碱(8.54%~8.93%)、贫镁(0.42%~0.52%)、贫钙(0.93%~1.38%)特征,并且A/NK>1.0,A/CNK<1.1;微量元素呈现低Rb、Zr和高Sr、Ba等质量分数,高Sr/Y和(La/Yb)_N特征;稀土元素表现轻稀土元素富集、重稀土元素亏损和较弱Eu的正异常特征;获得锆石原位^(176 )Yb/^(177 )Hf值为0.010 517~0.050 159,^(176 )Lu/^(177 )Hf值为0.000 476~0.001 784,^(176 )Hf/^(177 )Hf为0.282 310~0.282 457,对应的锆石ε_(Hf)(t)值为-12.7~-7.5,二阶段模式年龄为2 792~2 325Ma。上述特征揭示,松江河地区中生代似斑状花岗岩属准中等分异、同碰撞向伸展转换的Ⅰ型花岗岩,原始岩浆起源于新太古代陆壳重熔作用,岩浆就位发生在中侏罗世早阶段;它记录了燕山期早侏罗世古太平洋板块向欧亚大陆之下俯冲的挤压陆壳活化产生岩浆,并于中侏罗世地壳伸展岩浆上升过程中经岩浆结晶分离作用而产生的中等分异岩浆结晶形成,成岩后于晚侏罗世遭受了韧脆性构造作用改造。 | 鲁倩 孙景贵 安久海 韩吉龙 褚小磊 | 2019 | 吉林大学学报(地球科学版)2019，49，3： | 5 |
| 2 | Geochronology and Geochemical Characteristics of Intrusion in the Jinchangliang Gold Deposit,Inner Mongolia and Their Tectonic Significance显示文摘Discovered and mined in recent years, the Jinchangliang gold deposit has not yet been studied in its genetic type. In this paper, the geological features of ore deposit, S isotopic composition, metallogenic age and elements geochemical of the granite closely related to mineralization were discussed. The results of the geological features of ore deposit and S isotopic composition show that ore-bearing hydrothermal solution was closely related with the intrusion of magmatic. The granite is characteristic of high silica SiO_2=72.38%–72.98%, high aluminum and Al_2O_3=14.22%–14.35%, low calcium CaO=0.16% –0.26%, and low value of FeOT/MgO(6.86–7.73), and rich in alkalis Na_2O+K_2O=9.11%–9.24%, suggesting that it is high-K calc-alkaline, highly fractionated, weak aluminum A-type granite. The REE patterns are inclined to right and show intense fractionation between LREE and HREE, without obvious negative Eu anomaly(δEu=0.80–0.84). The primitive mantle-normalized spidergrams are characterized by depletion of Ba, U, Ta, Nb, Zr, Ti and P, which implies that the granite has the characteristics of the crust-mantle mixing. S isotopes also indicate that the material source of gold deposit is closely related to the granite rocks. The LA-ICP-MS Zircon UPb age of the Damiao rock mass medium-fine grained monzogranite(belonging to the early IndoChina) is(245±1) Ma. It shows that Jinchangliang gold deposit was not formed in Yanshanian, but the early Indo-China. Specifically speaking, the deposit was formed in the collision stage of the North China plate and the Siberian plate. | SUN Zhenjun SUN Guosheng YU Henan TIAN Yi LIU Shanli XIANG Zhu MENG Jian XUE Huaiyu LU Lina | 2015 | Acta Geologica Sinica(English Edition)2015，89，6： | 4 |
| 3 | 华北克拉通北缘早白垩世金成矿与地幔物质的贡献显示文摘华北克拉通北缘是我国重要的金成矿带,早白垩世金矿床主要分布在成矿带的中-东段赤峰-朝阳矿集区、五龙-猫岭矿集区、夹皮沟矿集区、老岭矿集区及附近区域。本文综述了华北北缘早白垩世金矿床的地质及同位素地球化学特征,讨论了早白垩世地幔组分参与金成矿的证据和过程。研究表明,华北北缘早白垩世金矿床与矿区内中-基性岩脉具有密切的时空关系;金矿脉中石英流体包裹体氢-氧同位素、碳酸盐矿物碳同位素及含金黄铁矿氦-氩同位素组成揭示成矿流体以岩浆水为主,具有壳-幔混合来源的特征;硫-铅-锶-钕同位素组成显示成矿物质具有显著的上地幔贡献。个别金矿床原位硫同位素组成反映成矿流体经历了强烈的水-岩反应,从围岩中萃取了部分硫等成矿组分。总体上,华北北缘早白垩世金矿具有基本一致的地质和地球化学特征,反映了幔源岩浆对金矿床的成矿流体及成矿物质具有重要贡献,其金成矿过程与早白垩世(140~120Ma)华北克拉通破坏及相关的壳幔相互作用有关。 | 白阳 张连昌 朱明田 黄柯 高炳宇 李文君 王长乐 | 2023 | 岩石学报2023，39，1： | 2 |
| 4 | 内蒙古敖汉旗金厂梁金矿床地质特征及矿床成因探析显示文摘金厂梁金矿床是近年来在赤峰—朝阳金矿带东北端发现的新矿床,矿体分布于大庙二长花岗岩外接触带建平群片麻杂岩碎裂岩带的北东向、近东西向断裂中,主要呈脉状产出,由硫化物石英脉和蚀变岩组成,围岩蚀变主要为硅化、黄铁绢英岩化、绿泥石化和高岭土化等。通过收集成矿岩体年代学、岩石地球化学、成矿流体及稳定同位素资料,探讨了成岩成矿时代、构造背景、成矿物质来源及矿床成因。成矿岩体大庙二长花岗岩锆石U-Pb年龄为245 Ma±1 Ma,为早印支期侵入体,Sr、Y含量表明其具有喜马拉雅型花岗岩特征,暗示大庙二长花岗岩是在地壳加厚背景下,由下地壳泥质岩等沉积岩部分熔融形成的S型花岗岩,是对华北板块和西伯利亚板块在晚二叠世末—早三叠世初沿西拉木伦河—长春一线缝合碰撞造山的响应。石英流体包裹体完全均一温度138℃~225℃,盐度1.0%~8.1%,密度0.86~0.97 g/cm 3,表明成矿流体为低盐度、低密度成矿流体。黄铜矿δ34 S为2.1‰~3.1‰,其成矿物质不是直接来自下地幔,而是源自下地壳中玄武岩等来自地幔岩石的部分熔融。金厂梁金矿床是在古亚洲洋闭合造山构造背景下形成的浅成中低温造山型金矿床;晚二叠世末—早三叠世初为古亚洲洋闭合造山期,是华北板块北缘重要的金矿成矿期。 | 单子凌 孙国胜 孙九达 王刚 李雪 周桓 | 2020 | 黄金2020，41，10： | 1 |
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