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赣南兴国县张家地钼钨矿床成岩成矿时代及地质意义
引用本文:丰成友,曾载淋,屈文俊,刘俊生,李海潘. 赣南兴国县张家地钼钨矿床成岩成矿时代及地质意义[J]. 岩石学报, 2015, 31(3): 709-724
作者姓名:丰成友  曾载淋  屈文俊  刘俊生  李海潘
作者单位: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实验室, 北京 100037;江西省地勘局赣南地质调查大队, 赣州 341000;国家地质实验测试中心, 北京 100037;江西省地勘局赣南地质调查大队, 赣州 341000;江西省地勘局赣南地质调查大队, 赣州 341000
基金项目:本文受国家重点基础研究发展计划973项目(2012CB416704)、中国地质调查局高层次地质人才培养计划(201309)和青年地质英才计划(201112)联合资助.
摘    要:地处EW向南岭成矿带和NE向武夷山成矿带叠置部位的赣南兴国-宁都钨锡矿集区产有多处不同矿化类型的钨锡多金属矿床,但总体研究程度较低。本文基于详细野外地质调查,重点开展了张家地钼钨矿床的高精度成岩成矿年代学研究,并探讨了区域钨锡矿床成岩成矿时空分布及地球动力学背景。张家地钼钨矿化产于花岗岩与震旦纪浅变质细碎屑岩的内、外接触带,包括石英脉型(王泥排矿段)和云英岩型(刘家庄矿段)两种矿化类型。利用SHRIMP锆石U-Pb法,获得张家地钼钨矿区似斑状中细粒黑云母花岗岩的年龄为154.1±1.8Ma;利用辉钼矿Re-Os法,获得王泥排矿段石英脉型矿体的辉钼矿Re-Os等时线年龄为158.4±3.1Ma、加权平均年龄为157.7±1.4Ma,刘家庄矿段云英岩型矿体的辉钼矿Re-Os等时线年龄为161.9±3.2Ma、加权平均年龄为157.9±1.6Ma,厘定矿床成岩成矿时代为晚侏罗世,对应于华南中生代第二次大规模成矿作用。石英脉型和云英岩型矿体中辉钼矿的铼含量均较低(9.58×10-6~22.65×10-6),表明成矿物质以壳源为主;综合分析区域最新年代学数据资料,表明钨锡矿床成岩成矿具多期性,主要集中在240~210Ma、170~150Ma和130~90Ma,以赣南和湘南为中心,钨锡矿床向四周成矿年龄均呈变小趋势。燕山期钨锡大规模成岩成矿作用主要形成于华南中生代岩石圈伸展-减薄时期的侏罗纪板内拉张的地球动力学背景。

关 键 词:钼钨矿床  成岩成矿时代  中生代成矿  地球动力学  张家地  赣南
收稿时间:2014-07-23
修稿时间:2014-10-10

A geochronological study of granite and related mineralization of the Zhangjiadi molybdenite-tungsten deposit in Xingguo County, southern Jiangxi Province, China, and its geological significance
FENG ChengYou,ZENG ZaiLin,QU WenJun,LIU JunSheng and LI HaiPan. A geochronological study of granite and related mineralization of the Zhangjiadi molybdenite-tungsten deposit in Xingguo County, southern Jiangxi Province, China, and its geological significance[J]. Acta Petrologica Sinica, 2015, 31(3): 709-724
Authors:FENG ChengYou  ZENG ZaiLin  QU WenJun  LIU JunSheng  LI HaiPan
Affiliation:MLR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;South Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, China;National Research Center of Geoanalysis, Beijing 100037, China;South Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, China;South Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, China
Abstract:The Xingguo-Ningdu ore cluster in southern Jiangxi Province, located in the convergent zone of the eastern Nanling EW-trending metallogenic belt and the western Wuyishan NE-trending metallogenic belt, possess several different type of W-Sn polymetallic deposits. However, little research has been done for these deposits. Based on detailed field investigations, high-precision isotope dating on the Zhangjiadi Mo-W deposit, the time-space distribution of W-Sn ore deposits in Cathaysia Block and their geodynamic settings are studied in this paper. SHRIMP zircon U-Pb age for porphyritic fine to medium-grained biotite granite from the Zhangjiadi ore deposit is 154.1±1.8Ma. Molybdenites separated from the quartz vein type orebody in the Wangnipai ore block and the greisen orebody in the Liujiazhuang ore block yield Re-Os isochron ages of 158.4±3.1Ma (weighted mean age 157.7±1.4Ma) and 161.9±3.2Ma (weighted mean age 157.9±1.6Ma), respectively, which are corresponding to Late Jurassic period. The studied molybdenites show quite low Re contents (9.58×10-6~22.65×10-6), suggesting a continental crustal source of the ore metals. Integrated with the latest research results, it is concluded that the W-Sn deposits formed during 240~210Ma, 170~150Ma and 130~90Ma, and are centered by the largest scale in southern Jiangxi Province and southern Hunan Province, and become younger in the east, west, south and north directions. We suggest that the Yanshanian large-scale magmatic and ore-forming processes may have occurred in a Jurassic intraplate extensional geodynamic setting during the Mesozoic lithosphere extension in South China.
Keywords:Molybdenite-tungsten deposit  Ages of magmatism and mineralization  Mesozoic mineralization  Geodynamic setting  Zhangjiadi deposit  Southern Jiangxi Province
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