| 河南商城县汤家坪钼矿辉钼矿铼_锇同位素年龄及地质意义 |
| 点此下载全文 |
| 引用本文：.2007.Re-Os isotopic ages of Tangjiaping molybdenum deposit in Shangcheng County，Henan and their geological significance[J].Mineral Deposits,26(3):289~295 |
| Hits: 3921 |
| Download times: 2838 |
|
| 基金项目:河南金达矿业有限公司“河南省商城县汤家坪矿区钼矿勘探”项目 |
|
| 中文摘要:为查明商城县汤家坪大型钼矿床形成的时代，建立钼多金属矿成矿模 式，利用电感耦合等离子体质谱仪对汤家坪等3个钼矿床的7件辉钼矿样品进行了Re-Os同位 素 年龄测定，获得汤家坪钼矿床辉钼矿Re_Os等时线年龄为（113.1±7.9） Ma，准确厘定其 成矿时代为早白垩世；测得天目沟钼矿床辉钼矿Re_Os 同位素模式年龄为（121.6±2.1） Ma，大银尖钼矿床辉钼矿Re_Os 同位素模式年龄为（122.1±2.4）Ma，初步确定大别山钼 成 矿带的成矿年龄大约在（122.1±2.4）～（113.1±7.9） Ma之间。结合前人研究成果 ，认为大别山北麓钼成矿作用的地球动力学背景为燕山晚期大别造山带在伸展机制下岩石圈 减薄，中国中东部区域构造_动力体制由近EW向构造为主向近SN向构造为主的大转换时期 。 |
| 中文关键词:地球化学 辉钼矿 铼_锇同位素年龄 地球动力学背景 汤家坪 |
| |
| Re-Os isotopic ages of Tangjiaping molybdenum deposit in Shangcheng County，Henan and their geological significance |
|
|
| Abstract:In order to determine the age of the Tangjiaping large_size molybdenum deposit i n Shangcheng County and establish the metallogenic model for molybdenum_polymeta llic ore deposits, the authors dated seven molybdenite samples from Tangjiaping and two other molybdenum deposits by using such ionic mass spectrographs as indu ctance coupling. The results show that the Re_Os isochron age of molybdenite fro m the Tangjiaping molybdenum deposit is （113.1±7.9） Ma, suggesting Early Cr et aceous, the Re_Os isotopic model age of molybdenite from the Tianmugou molybdeni te is （121.6±2.1）Ma, and the Re_Os isotopic model age of molybdenite from th e Dayinjian molybdenum is （122.1±2.4）Ma. It is thus thought that the ore-fo rm ing age of the Dabie molybedum metallogenic belt should be （122.1±2.4）～（1 13 .1±7.9）Ma. Considering also the achievements made by previous workers, the au thors hold that the molybdenum metallogenic geodynamic background of the norther n slope of the Dabie Mountain should be a great transformation period during whi ch the lithosphere of the Dabie orogenic belt became thinner under the stretchin g mechanism and the regional tectonic_dynamic system of central and eastern Chin a turned from nearly EW_trending to nearly SN_trending structures. |
| keywords:geochemistry, molybdenite, Re_Os isotopic age, geodynamic background, Tangjiaping |
| View Full Text View/Add Comment Download reader |
