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| 庐枞盆地侵入岩的时空格架及其对成矿的制约 | |
| 引用本文： | 周涛发,范裕,袁峰,宋传中,张乐骏,钱存超,陆三明.庐枞盆地侵入岩的时空格架及其对成矿的制约[J].岩石学报,2010,26(9):2694-2714. |
| 作者姓名： | 周涛发 范裕 袁峰 宋传中 张乐骏 钱存超 陆三明 |
| 作者单位： | 1. 合肥工业大学资源与环境工程学院,合肥,230009;中国科学院矿产资源研究重点实验室,北京,100029 2. 合肥工业大学资源与环境工程学院,合肥,230009 3. 合肥工业大学资源与环境工程学院,合肥,230009;Centre of Excellence in Ore Deposits(CODES),University of Tasmania,Private Bag 79,Hobart,Australia 4. 安徽省公益性地质项目管理中心,合肥,230001 5. Centre of Excellence in Ore Deposits(CODES),University of Tasmania,Private Bag 79,Hobart,Australia |
| 基金项目： | 本文受国家自然科学基金项目(40830426、40803015、40772131)、国家深部探测技术与实验研究专项第三项目(SinoProbe-03)、安徽省地质勘查专项费项目(2005-51、2007-1)、中国科学院矿产资源研究重点实验室开放课题、澳大利亚塔斯马尼亚大学国家优秀矿床研究中心科研基金(CODES2009P2-3)和新世纪优秀人才支持计划项目(NCET-10-0324)联合资助. |
| 摘 要： | 庐枞中生代火山盆地位于长江中下游断陷带内,地处扬子板块的北缘。庐枞盆地内火山岩和侵入岩分布广泛,包括龙门院、砖桥、双庙和浮山四组火山岩以及34个侵入岩体。本次工作在详细野外地质调查的基础上,结合作者已有的5个岩体(巴家滩岩体、城山岩体、花山岩体、黄梅尖岩体和枞阳岩体)年代学的研究工作,系统开展了盆地侵入岩体的年代学和时空分布特征研究。通过侵入岩锆石LA-ICP-MSU-Pb定年方法,本次研究确定庐枞盆地内15个主要侵入岩体的成岩时代分别为:黄屯岩体134.4±2.2Ma、岳山岩体132.7±1.5Ma、拔茅山岩体132.7±1.9Ma、尖山岩体132.0±1.3Ma、谢瓦泥岩体131.6±1.1Ma、龙桥岩体131.1±1.5Ma、焦冲岩体129.6±1.3Ma、土地山岩体127.4±2.8Ma、凤凰山岩体128.4±0.9Ma、罗岭岩体126.3±2.0Ma、龙王尖岩体126.5±1.5Ma、小岭岩体126.2±1.8Ma、大缸窑岩体125.9±1.3Ma、巴坛岩体125.1±1.1Ma、毛王庙岩体123.9±1.9Ma。从而得出庐枞盆地内侵入岩的成岩时代界于134～123Ma之间,属于早白垩世,并进一步将庐枞盆地内侵入岩划分成2期,其中早期侵入岩主要为二长岩和闪长岩类,主要分布在盆地北部,与龙门院旋回和砖桥旋回火山活动关系密切,岩体侵位受火山机构和北东向构造联合控制,成岩时代为134～130Ma;晚期侵入岩还可分为两类,第一类主要为正长岩类,分布在盆地南部,主要受盆地内火山机构和北北东向断裂控制,侵入活动与双庙旋回和浮山旋回火山岩浆活动相对应,成岩时代为129～123Ma;第二类主要为A型花岗岩,分布于盆地东南缘,成岩时代为126～123Ma,主要受区域北北东向大断裂控制,而与盆地火山机构无关。庐枞盆地内与岩浆岩有关的铁、铜、金、铅、锌、铀矿床可划分为3个成矿系列,其中砖桥旋回形成的二长岩类与罗河、泥河和龙桥等铁矿床、岳山铅锌矿床及井边和拔茅山铜矿床关系密切,双庙旋回形成的正长岩类与马口等铁矿床关系密切,而晚期的A型花岗岩与3440矿床等金、铀矿化关系密切。长江中下游地区燕山期存在145～136Ma、135～127Ma、126～123Ma等三期成岩(成矿)作用,庐枞盆地内侵入岩对应于该区域第二和第三期岩浆活动的产物,其形成时代明显晚于长江中下游成矿带断隆区内与斑岩型-矽卡岩型铜(铁)、金矿床有关的高钾钙碱性岩体(第一期)。庐枞盆地内侵入岩形成于区域岩石圈伸展的构造环境。 |
| 关 键 词： | 白垩纪侵入岩 成岩时代 时空格架 成矿系列 庐枞盆地 长江中下游 |
| 收稿时间： | 7/3/2010 12:00:00 AM |
| 修稿时间： | 2010/8/22 0:00:00 |
Temporal-spatial framework of magmatic intrusions in Luzong volcanic basin in East China and their constrain to mineralizations. |
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| ZHOU TaoF,FAN Yu,YUAN Feng,SONG ChuanZhong,ZHANG LeJun,QIAN CunChao and LU SanMing.Temporal-spatial framework of magmatic intrusions in Luzong volcanic basin in East China and their constrain to mineralizations.[J].Acta Petrologica Sinica,2010,26(9):2694-2714. | |
| Authors: | ZHOU TaoF FAN Yu YUAN Feng SONG ChuanZhong ZHANG LeJun QIAN CunChao and LU SanMing |
| Institution: | School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009, China;Key Laboratory of Mineral Resources, Chinese Academy of Sciences, Beijing 100029, China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009, China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009, China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009, China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009, China;Centre of Excellence in Ore Deposit(CODES),University of Tasmania,Private Bag 79,Hobart,Australia;Public Geological Survey Management Center of Anhui Province, Hefei 230001, China;Public Geological Survey Management Center of Anhui Province, Hefei 230001, China |
| Abstract: | Luzong Mesozoic volcanic basin is located in the Lower Yangtze River fault-depression zone, where is the north margin of the Yangtze block. The volcanic and intrusive plutons occur widely in Luzong basin, including four formations of volcanic rocks, such as, Longmenyuan Formation, Zhuanqiao Formation, Shuangmiao Formation and Fushan Formation and 34 intrusive plutons. Based on detailed field geological work and our former geochronology research on five plutons such as Bajiatan pluton, Chengshan pluton, Huashan pluton, Huangmeijian pluton and Zongyang pluton, we further carried out systematic geology and geochronology study of intrusive plutons in the Luzong Basin. LA-ICP-MS zircon U-Pb dating for 15 plutons has been carried out, which yield the ages of Huangtun pluton (134.4±2.2Ma), Yueshan pluton (132.7±1.5Ma), Bamaoshan pluton (132.7±1.9Ma), Jianshan pluton (132.0±1.3Ma), Xiewani pluton (131.6±1.1Ma), Longqiao pluton (131.1±1.5Ma), Jiaochong pluton (129.6±1.3Ma), Tudishan pluton (127.4±2.8Ma), Fenghuangshan pluton (128.4±0.9Ma), Luolin pluton (126.3±2.0Ma), Longwangjian pluton (126.5±1.5Ma), Xiaolin pluton (126.2±1.8Ma), Dagangyao pluton (125.9±1.3Ma), Batan pluton (125.1±1.1Ma), Maowangmiao pluton (123.9±1.9Ma), respectively. The epoch of plutons in the Luzong basin is 134~123Ma. According to the epoch and geological characteristics, the intrusive rocks in the Luzong basin can be divided into two stages. The early stage monzonite-diorite plutons outcrop in the north part of the Luzong basin with epoch of 134~130Ma, are controlled by NNE orient structures and volcano-structure and have close relationship with Longmenyuan and Zhuanqiao cycle volcanic activity. The late stage intrusive plutons have two types. One type is syenite and outcrops in the south part of the Luzong basin, whose epoch is 129~123Ma. Those syenite plutons are mainly controlled by NNE orient structures or volcano-structure and share close relationship with Shuangmiao and Fushan cycle volcanic activity. The other type is A-type granites and outcrops in the southeast margin of the basin, whose epoch is 126~123Ma. Those A-type granites are controlled by regional NNE deep faults and have no relationship with the basin volcano-structures. The iron, copper, gold, lead, zinc and uranium deposits in the study area related to magmatic activities can be classified into three metallogenic seiries. The monzonite-diorite plutons have close relationship with Luohe, Nihe and Longqiao iron deposits, Yueshan lead and zinc deposit and Jingbian and Bamaoshan copper deposits. The syenite plutons have close relationship with Makou and other iron deposits. The A-type granites have close relationship with No. 3440 and other gold uranium deposits. Regionally, there are three periods (145~136Ma, 135~127Ma, 126~123Ma) of magmatic and ore-forming activities in the Middle-Lower Yangtze River Valley metallogenic belt. The intrusive plutons in the Ning-Wu basin were the products of the second and third period magmatic activity and obviously later than the first period high-K calc-alkaline intrusions related to skarn-porphyry Cu-Au mineralizations in the uplift areas in the Middle-Lower Yangtze River Valley metallogenic belt. The intrusive plutons in Luzong volcanic basin were thought to be formed under regional lithospheric extension and thinning environment which has great significance for further research and exploration. |
| Keywords: | Cretaceous Intrusive rocks Ziron U-Pb geochronology Framework of magmatic activity Metallogenic seiries Luzong basin Middle-Lower Yangtze River Valley |
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