Tectonic controls on ore deposit exhumation and preservation:A case study of the Handan-Xingtai iron-skarn district  

作　　者：Yannan Wang Zhiyuan He Kai Bian Cunliang Zhao Lian Chen Rui Dong Jin Zhang Zhaoqun Zhu Guang Liu 

机构地区：[1]Key Laboratory of Resource Exploration Research of Hebei Province,Hebei University of Engineering,Handan 056038,PR China [2]Hebei Province Collaborative Innovation Center for Strategic Critical Mineral Research,Hebei GEO University,Shijiazhuang 050031,PR China [3]Laboratory for Mineralogy and Petrology,Department of Geology,Ghent University,Krijgslaan 281 S8,9000 Ghent,Belgium [4]Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Chinese Academy of Geological Sciences,Beijing 100037,PR China [5]The Institute of Regional Geological Survey of Hebei Province,Langfang 065000,Hebei,PR China

出　　处：《Geoscience Frontiers》2024年第6期469-484,共16页地学前缘（英文版）

基　　金：supported by the Open Project Program of Hebei Province Collaborative Innovation Center for Strategic Critical Mineral Research,Hebei GEO University,China(No.HGUXT-2023-14);the China Geological Survey(DD20221646);National Natural Science Foundation of Hebei Province(Nos.D2020402013 and D2023402022);National Natural Science Foundation of China(No.42102091).

摘　　要：Despite the growing concern regarding post-mineralization thermo-tectonic processes in recent years,the relative roles in exhuming and preserving ore deposits remain highly controversial.This study presents new apatite fission track and(U-Th)/He data from the Xishimen iron skarn deposit in the Handan-Xingtai district,central North China Craton.Apatite fission track dating yielded central ages ranging from 88±18 Ma to 125±9 Ma,with mean confined track lengths varying between 11.9±0.4μm and 13.3±0.2μm.Integrated apatite(U-Th)/He dating provided ages of 42.5±0.8 Ma to 48.1±3.3 Ma.Our new data,combined with previous zircon U-Pb and potassium-bearing mineral^(40)Ar/^(39)Ar ages,revealed three cooling episodes:very rapid cooling(100–140℃/Ma)at ca.130–120 Ma,a protracted slow cooling period(0.2–0.4℃/Ma)at ca.120–50 Ma,and moderate cooling(0.8–1.0℃/Ma)since ca.50 Ma.The initial rapid cooling phase was primarily attributed to post-magmatic thermal equilibration following the shallow emplacement of the Xishimen deposit.The subsequent cooling phases were controlled by uplift and exhumation processes.Our thermal models indicate an estimated total unroofing thickness of<3 km,which is shallower than the emplacement depth of the ore deposit(3–5 km).This suggests significant potential for mineral exploration.Furthermore,a comprehensive review of preservation mechanisms for various ore deposits underscores the significant role of tectonics in both exhuming and preserving ore bodies.

关 键 词：Low-temperature thermochronology Ore deposits Exhumation and preservation Handan-Xingtai district Xishimen iron deposit 

分 类 号：P619.2[天文地球—矿床学]