| 铜陵中酸性侵入岩成因及锆石SHRIMP定年 |
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| 引用本文： | 吴才来,高前明,国和平,郭祥炎,刘良根,郜源红,雷敏,秦海鹏.铜陵中酸性侵入岩成因及锆石SHRIMP定年[J].岩石学报,2010,26(9):2630-2652. |
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| 作者姓名： | 吴才来 高前明 国和平 郭祥炎 刘良根 郜源红 雷敏 秦海鹏 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 安徽地矿局321地质队,铜陵,244033 |
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| 基金项目： | 本文受国家专项(SinoProbe-05-05)、国家自然科学基金项目(49772106、40472034和40672049) 和中国地调局项目(1212010918007、1212010818090、1212010611803和1212010711816)联合资助. |
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| 摘 要： | 铜陵地区高钾钙碱性系列侵入岩包括辉长闪长岩+石英二长闪长岩+花岗闪长岩,橄榄安粗岩系列侵入岩包括辉石二长闪长岩+二长岩+石英二长岩。高钾钙碱性系列侵入岩中含有富云母包体和微粒闪长质包体以及镁铁质石英二长闪长质包体,与区内的铜(金)矿化关系密切;橄榄安粗岩系列岩体中含多种深源堆积岩包体,与金(铜)、银、铅、锌等矿化关系密切。锆石SHRIMP定年结果表明,石英二长闪长岩为140Ma左右,花岗闪长岩为142～146Ma,辉长闪长岩为143Ma,辉石二长闪长岩为138～142Ma,二长岩为143Ma,可见两个系列侵入岩的年龄既有一定的差别,也有一些重叠。岩石地球化学及包体岩石学研究表明,橄榄安粗岩系列岩石可能为幔源碱性玄武质岩浆分异后形成,高钾钙性系列岩石可能为分异的幔源岩浆与壳源岩浆混合后形成。
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| 关 键 词： | 锆石SHRIMP定年 高钾钙碱性和橄榄安粗岩系列 侵入岩 成因 铜陵 |
| 收稿时间： | 2009/7/14 0:00:00 |
| 修稿时间： | 2010/8/15 0:00:00 |
Petrogenesis of the intermediate-acid intrusive rocks and zircon SHRIMP dating in Tongling, Anhui, China. |
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| WU CaiLai,GAO QianMing,GUO HePing,GUO XiangYan,LIU LiangGen,GAO YuanHong,LEI Min and QIN HaiPeng.Petrogenesis of the intermediate-acid intrusive rocks and zircon SHRIMP dating in Tongling, Anhui, China.[J].Acta Petrologica Sinica,2010,26(9):2630-2652. |
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| Authors: | WU CaiLai GAO QianMing GUO HePing GUO XiangYan LIU LiangGen GAO YuanHong LEI Min and QIN HaiPeng |
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| Institution: | Institute of Geology, CAGS, Beijing 100037, China.;321 Geological Team, Anhui Bureau of Geology and Mineral Resources, Tongling 244033, China;321 Geological Team, Anhui Bureau of Geology and Mineral Resources, Tongling 244033, China;321 Geological Team, Anhui Bureau of Geology and Mineral Resources, Tongling 244033, China;321 Geological Team, Anhui Bureau of Geology and Mineral Resources, Tongling 244033, China;Institute of Geology, CAGS, Beijing 100037, China.;Institute of Geology, CAGS, Beijing 100037, China.;Institute of Geology, CAGS, Beijing 100037, China. |
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| Abstract: | The Mesozoic intermediate-acid intrusive rocks in Tongling area can be divided into two magmatic series, namely the shoshonitic series and the high-potassium (K) calc-alkaline series. The shoshonitic series is characterized by an association of pyroxene monzodiorites (PMD)+monzonites (Mz)+quartz monzonites (QM), and high Rittmann indices. This series has common association with gold deposits. This series is associated cumulate enclaves such as pyroxene cumulate, hornblende cumulate and hornblende gabbro. The high-potassium calc-alkaline series is an association of gabbro-diorite (GBD)+quartz monzodiorites (QMD)+granodiorites (GD). It has lower Rittmann indices and REEs than the shoshonitic series and is associated with copper deposits. This series contains three kinds of enclaves, mica-enriched enclaves, which appear to be melted pelitic rock, mafic quartz monzodiorite enclaves and micro-diorite enclaves. The two series overlap in age. Zircon U-Pb SHRIMP ages for the quartz monzodioirite are around 140Ma, for the granodioirte are 142~146Ma, for the gabbro-diorite is 143Ma, for pyroxene monzodiorites are 138~142Ma and monzonite is 143Ma. From the differences in chemistry between the two suites study and the different kinds of enclaves found in each, we conclude that the shoshonitic series magma is derived from the differentiation of the mantle-derived alkaline basic magma and the high-potassium (K) calc-alkaline series magma is mixture between the differentiated mantle magma and crustal magma. |
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| Keywords: | Zircon SHRIMP dating Both high-K calc-alkaline and shoshonitic series Intrusive rock Origin Tongling |
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