| 高 阳.河南嵩县土地庙沟铅锌矿床有关的花岗岩体LA-ICP-MS锆石U-Pb测年和Hf同位素特征及其地质意义[J].地质与勘探,2019,55(3):685-700 |
| 河南嵩县土地庙沟铅锌矿床有关的花岗岩体LA-ICP-MS锆石U-Pb测年和Hf同位素特征及其地质意义 |
| LA-ICP-MS zircon U-Pb dating and Hf isotope features of the Tudimiaogou Pb-Zn deposit related granite pluton in Songxian County, Henan Province and their geological implications |
| 投稿时间：2018-03-22 修订日期：2018-11-05 |
| DOI：10.12134/j.dzykt.2019.03.002 |
| 中文关键词: 栗扎树岩体 土地庙沟铅锌矿 LA-ICP-MS锆石U-Pb测年 Hf同位素分析 |
| 英文关键词: Lizhashu pluton, Tudimiaogou Pb-Zn deposit, LA-ICP-MS zircon U-Pb age, Hf isotopic analysis |
| 基金项目:河南省国土资源厅2014年度“两权价款”地质科研项目（编号:2015-258-16）
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| 中文摘要: |
| 土地庙沟铅锌矿床是豫西南铅锌银多金属成矿区域的重要组成部分。本文以与土地庙沟铅锌矿床成矿关系密切的栗扎树岩体为研究对象，利用LA-ICP-MS锆石U-Pb测年和Hf同位素分析方法，探讨岩体成岩时代及其与矿床成矿时空相关性。岩体测得的LA-ICP-MS锆石U-Pb年龄加权平均值分别为141.6±1.3Ma（样品YZY-G07）、135.5±1.6Ma（样品YZY-G08）、116.2±1.2Ma（样品YZY-G01），Hf同位素分析二阶段模式年龄为1724Ma~2244 Ma，表明成岩物质主要来源于地壳，并结合矿床特征，与栾川-维摩寺断裂北侧的合峪、伏牛山、太山庙相比，从早到晚，140Ma、135Ma、117Ma均有较好的对应关系。根据形成于140Ma左右的花岗岩浆活动，结合岩石地球化学、矿床地质特征、同位素特征等资料，并与华北克拉通南缘南泥湖矿田的成矿构造热事件对比，可推断出矿床为早白垩世早期同一构造-岩浆-流体成矿事件的产物，为矿山企业勘查找矿提供了科学依据。 |
| 英文摘要: |
| The Tudimiaogou Pb-Zn deposit is an important part of the lead-zinc-silver polymetallic metallogenic region in the southwest of Henan. Taking the Lizhashu pluton associated with this deposit in the northwest as the object, this work used the LA-ICP-MS zircon U - Pb dating and Hf isotopic analysis to explore the diagenetic age and the genesis and mineralization in this region. The weighted average ages of LA-ICP-MS zircon U-Pb dating in the pluton are 141.6±1.3 Ma (YZY-G07), 135.5±1.6 Ma (YZY-G08), and 116.2±1.2 Ma (YZY -G01), respectively. The Hf isotopic analysis of the two-stage model ages 1724-2244 Ma shows that diagenetic material was from crust, corresponding well to 140Ma, 135Ma and 117Ma from early to late compared with Heyu, Funiushan and Taishanmiao on the north side of the Luanchuan-Weimomiao fault. According to the granitic magma activities in the pluton formed at 140 Ma, combined with the data of rock geochemistry, geological characteristics of the deposit and isotopic characteristics, and compared with the metallogenic tectonic thermal events in the Nannihu orefield on the southern margin of the North China Craton, it can be inferred that the deposit was the product of the same tectonic-magmatic-fluid mineralization event in the early epoch of Early Cretaceous. It provides scientific evidence for surveys and ore search of mining enterprises. |
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