| 华北克拉通北缘张家口-宣化地区古生代-中生代岩浆构造活动与成矿作用 |
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| 引用本文： | 甄世民,王大钊,白海军,贾儒雅,王江,查钟健,李阳,缪建普.华北克拉通北缘张家口-宣化地区古生代-中生代岩浆构造活动与成矿作用[J].岩石学报,2021,37(6):1619-1652. |
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| 作者姓名： | 甄世民 王大钊 白海军 贾儒雅 王江 查钟健 李阳 缪建普 |
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| 作者单位： | 中国地质调查局发展研究中心, 北京 100037;自然资源部矿产勘查技术指导中心, 北京 100083;东华理工大学核资源与环境国家重点实验室, 南昌 330013;河北省地矿局第三地质大队, 张家口 075000;中国地质大学(北京), 北京 100083;安徽省地质测绘技术院, 合肥 230022 |
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| 基金项目： | 本文受中国地质调查局地质矿产调查专项（DD20190159、DD20160052、DD20190166）和国家自然科学基金项目（9260019、42003032、41573036）联合资助. |
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| 摘 要： | 河北省张家口-宣化地区(张宣地区)位于华北克拉通北缘中段,区内自显生宙以来构造活动频繁,并产出大量岩浆岩和金矿床,是研究华北克拉通北缘岩浆-构造-成矿演化体系的重要对象。本文通过对张宣地区的水泉沟正长岩、响水沟似斑状花岗岩、井儿洼粗安岩-英安岩、象山花岗闪长岩、青羊沟黑云母二长花岗岩和张家口组流纹岩的锆石年龄、Lu-Hf同位素和地球化学组成进行研究,结合前人研究成果,获得区内古生代-中生代岩浆岩的侵位时期主要为海西期(峰值398Ma和373Ma)、印支期(峰值234Ma)和燕山期(峰值143Ma和130Ma)。张宣地区在古生代-中生代经历了古亚洲洋俯冲、华北克拉通破坏及古太平洋俯冲过程。早古生代时期,古亚洲洋向华北克拉通俯冲;到泥盆纪,白乃庙岛弧带和华北克拉通北缘发生弧陆碰撞,张宣地区处于弧陆碰撞后的伸展环境,富集地幔岩浆上涌并经历了地壳的同化混染和分离结晶的共同作用,形成大量碱性岩;二叠纪末期-三叠纪,各微陆块相互碰撞,张宣地区处于碰撞后伸展阶段,地幔岩浆引起加厚下地壳的部分熔融,基性、酸性岩浆混合,导致区内的基性岩与酸性岩共存;侏罗纪-白垩纪时期,华北克拉通发生减薄,形成区内大范围的侵入岩和火山岩。张宣地区产有大量金矿、铅锌矿、银矿及少量铜矿和钼矿,金矿集中产于宣化-崇礼-赤城交界处,而银铅锌多金属矿则成群成带环绕金矿化集中区分布。成矿时间主要为海西期和燕山期,印支期成矿尚未明确,但成矿潜力巨大。根据地质特征和同位素组成,可将张宣地区的金矿床划分为"东坪式"、"小营盘式"和"张全庄式"三类。古生代-中生代各时期岩浆活动对金成矿均有贡献,大部分金矿床与海西期和燕山期岩浆活动联系密切,多期次成矿及成矿叠加是形成张宣地区大量金矿床的重要因素。
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| 关 键 词： | 张家口-宣化地区 古生代-中生代 岩浆构造活动 岩浆-构造-成矿系统 金矿 |
| 收稿时间： | 2021/1/1 0:00:00 |
| 修稿时间： | 2021/4/14 0:00:00 |
The Paleozoic-Mesozoic magmatic-tectonic activities and their geological implications in the Zhangjiakou-Xuanhua district, northern margin of the North China Craton |
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| ZHEN ShiMin,WANG DaZhao,BAI HaiJun,JIA RuY,WANG Jiang,ZHA ZhongJian,LI Yang,MIAO JianPu.The Paleozoic-Mesozoic magmatic-tectonic activities and their geological implications in the Zhangjiakou-Xuanhua district, northern margin of the North China Craton[J].Acta Petrologica Sinica,2021,37(6):1619-1652. |
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| Authors: | ZHEN ShiMin WANG DaZhao BAI HaiJun JIA RuY WANG Jiang ZHA ZhongJian LI Yang MIAO JianPu |
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| Institution: | Center of Development and Research, China Geological Survey, Beijing 100037, China;Technical Guidance Center for Mineral Resources Exploration, Ministry of Natural Resources, Beijing 100083, China;State Key Laboratory of Nuclear Resource and Environment, East China University of Technology, Nanchang, 330013, China;The Third Geological Brigade of Hebei Bureau of Geology and Mineral Resources, Zhangjiakou 075000, China;School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China;Institute of Geological Surveying and Mapping Technology of Anhui Province, Hefei 230022, China |
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| Abstract: | The Zhangjiakou-Xuanhua area is located in the central part of the northern margin of the North China Craton (NCC). There are many tectonic activities during Phanerozoic, and lots of magmatic rocks and gold deposits were developed in this area, which is an important case to study magmatic-tectonic-metallogenic evolution systems of the northern margin of the NCC. In this study, we present zircon U-Pb ages, Lu-Hf isotope and geochemical compositions of the Shuiquangou syenite, the Xiangshuigou porphyritic granite, the Jingerwa granite, the Xiangshan granodiorite, the Qingyanggou biotite monzogranite and the Zhangjiakou Formation rhyolite. Combineing with previously published results in the Zhangjiakou-Xuanhua area, three periods of magmatic activity have been recognized during the Paleozoic to Mesozoic. They are the Hercynian magmatic activity with peak ages of 398Ma and 373Ma, the Indosinian magmatic activity with peak age of 234Ma and the Yanshanian magmatic activity with peak ages of 143Ma and 130Ma. The Zhangjiakou-Xuanhua area had suffered subduction of the Paleo-Asian Ocean (PAO), destruction of the NCC and subduction of the Paleo-Pacific Ocean (PPO). During the Early Paleozoic, the PAO subducted under the NCC. At Devonian, arc-continental collision occurred between the Bainaimiao arc and the northern margin of the NCC, and the Zhangjiakou-Xuanhua area was in a post-collisional extensional environment. The enriched mantle magma upwelled and suffered crustal assimilation and fractional crystallization, creating lots of alkaline rocks. During the Late Permian to Triassic, the microcontinents collided with each other, and the study area was under post-collision extensional setting. The thickened lower crust was heated by mantle magma, leading to mixing of basic- and acid-magmas, generating the coexistence of mafic and felsic igneous rocks. During the Jurassic to Cretaceous, thinning of the NCC resulted in the widely distributed intrusive and volcanic rocks. Large amounts of Au, Pb-Zn, Ag deposits and several Cu and Mo deposits developed in the Zhangjiakou-Xuanhua area. Gold deposits mostly located in the junction area of Xuanhua, Chongli, Chicheng counties, while Pb-Zn-Ag deposits distributed around the gold mineralization area. Mineralization ages of deposits were concentrated in the Hercynian and Yanshanian, and it is unclear whether mineralization occurred in the Indosinian, but existing great metallogenic potential. Gold deposits in the Zhangjiakou-Xuanhua area could be divided into the "Dongping type", the "Xiaoyingpan type" and the "Zhangquanzhuang type" according to their geological and isotope characteristics. The Paleozoic Mesozoic magmatic activities were contributed to gold mineralization, and most gold deposits had genetic relationships with the Hercynian and Yanshanian magmatic activities. Multi-stage and superimposed mineralization are the essential factors to generate the large amounts of gold deposits in the Zhangjiakou-Xuanhua area. |
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| Keywords: | Zhangjiakou-Xuanhua area Paleozoic-Mesozoic Magmatic-tectonic activities Magmatic-tectonic-metallogenical system Gold deposits |
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