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豫西鱼池岭斑岩型钼矿床地质特征及其辉钼矿铼-锇同位素年龄

ISSN号：0258-7106
期刊名称：《矿床地质》
时间：0
分类：P618.65[天文地球—矿床学;天文地球—地质学]
作者机构：[1]中国地质大学（北京）地球科学与资源学院,北京100083, [2]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点开放实验室,北京100037, [3]国家地质实验测试中心,北京100037, [4]洛阳龙羽山川钼业有限公司,河南洛阳471400
相关基金：本文得到全国危机矿山接替资源找矿项目（编号20089949、200841019）、国土资源大调查项目（1212010634001）和国家自然科学基金项目（40434011）的共同资助志谢在野外工作中得到向君峰硕士、洛阳龙羽山川钼业有限公司刘彦伟、徐卫强、杜彦臣、闫立伟等技术人员的大力支持与协助;室内工作得到Re-Os同位素实验室杜安道研究员的帮助与指点;成文过程中得到两位审稿人的细致评阅和中肯建议,在此一并表示衷心感谢.

作者：周珂[1], 叶会寿[2], 毛景文[2], 屈文俊[3], 周树峰[4], 孟芳[1], 高亚龙[1]

关键词：地质学, RE-OS同位素定年, 斑岩型钼矿, 伸展环境, 鱼池岭, 河南, geology, Re-Os dating, porphyry Mo deposit, extensional environment, Yuchiling, Henan Province

中文摘要：

河南省嵩县鱼池岭钼矿是近几年在东秦岭钼矿带中新发现的超大型斑岩钼矿床。该钼矿床产于合峪复式花岗岩体及隐爆角砾岩中。含矿岩体以富二氧化硅、铝质、贫钙、富碱、高F以及K2O含量大于Na2O含量为特征。矿区内辉钼矿化主要类型为浸染状、细脉状、网脉状、薄膜状和薄饼状。成矿围岩蚀变类型有钾长石化、硅化、绢云母化、黄铁矿化、黄铁绢英岩化、绿帘石化、绿泥石化和高岭石化等，具典型的斑岩型钼矿床的矿化和围岩蚀变特征。笔者选取了6件不同矿化类型的辉钼矿样品进行Re-Os同位素定年，获得模式年龄（130．3±2．0）～（131．7±1．9）Ma，等时线年龄（131．2±1．4）Ma。表明该矿床形成于早白垩世，与赋矿的合峪花岗岩体的侵位年龄相一致，应为同一构造-岩浆-流体活动的产物。辉钼矿中Re的含量为12．48×10^-6～53．39×10^-6，表明成矿物质具有壳幔混源性质。鱼池岭钼矿与东沟、汤家坪等斑岩钼矿形成于同一时期，应为东秦岭大别地区晚中生代区域岩石圈大规模伸展的响应。

英文摘要：

The Yuchiling Mo deposit located in Songxian County of Henan Province is a newly discovered superlarge porphyry Mo deposit in the East Qinling molybdenum belt. The deposit is hosted in the porphyritic monzogranite and breccia unit of Heyu composite granitic pluton. The host rock is characterized by rich silica and aluminum, poor calcium and abundant alkali with high K2O/Na2O ratios and F content. The main ore-forming types in the deposit include disseminated, veinlet, stockwork, and laminated molybdenite mineralizations, and the major alteration types of wall rocks comprise potassic alteration, silicification, sericitization, pyritization, phyllic alteration, epidotization, chloritization, argillic alteration etc., which constitute typical ore-forming and alteration characteristics of porphyry Mo deposits. Six molybdenite-bearing samples of different mineralizing types were selected for precise Re-Os dating, which yielded model ages ranging from （130.3±2.0）Ma to （131.7±1.9） Ma and an isochron age of （131.2±1.4） Ma. The deposit was formed in the Early Cretaceous, which is consistent with the emplacing age of the host rock Heyu granitic pluton. The authors thus believe that they are products of the same magma-structure-fluid activity. The Re contents of molybdenite are （12. 48±53. 39）×10^-6, indicating that they were derived from mixed crust and mantle sources. The Yuchiling Mo deposit was formed at the same time with the Donggou and the Tangjiaping Mo deposits, and hence should be the response to Late Mesozoic large-scale regional lithospheric extension in East Qinling-Dabie area.