| 鲁东地区侵入岩形成时代和期次划分——锆石SHRIMPU—Pb年龄的证据 |
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| 引用本文： | 王世进,;王来明,;万渝生,;张成基,;宋志勇,;王金光.鲁东地区侵入岩形成时代和期次划分——锆石SHRIMPU—Pb年龄的证据[J].山东地质,2009(12):8-20. |
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| 作者姓名： | 王世进 ;王来明 ;万渝生 ;张成基 ;宋志勇 ;王金光 |
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| 作者单位： | [1]山东省地质调查院,山东济南250013; [2]北京离子探针中心,北京100037; [3]山东省地质矿产勘查开发局,山东济南250013 |
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| 摘 要： | 鲁东地区前寒武纪侵入岩其侵入活动集中于新太古代和新元古代，均遭受不同程度的区域变质和韧性剪切带的改造，形成一套花岗质片麻岩类。新太古代早期TTG质花岗岩分布于胶北隆起区莱州一栖霞一带，经受了区域变质作用，形成一套灰色片麻岩，锆石内核SHRIMPU—Pb年龄2726—2707Ma基本代表岩浆结晶年龄，锆石变质边为2500Ma；古元古代侵入岩——莱州基性一超基性岩组合形成于1900～1850Ma左右，锆石SHRIMPU—Pb年龄（1852±9）Ma，（1868±11）Ma；新元古代侵入岩主要为花岗闪长质-二长花岗质片麻岩，出露于胶南-威海造山带，锆石U～Pb定年结果集中为892～605Ma，其中荣成超单元锆石SHRIMPU—Pb年龄720～780Ma。中生代侵入岩以花岗岩类为主，集中出露于半岛北部和东南沿海一带。燕山早期侵入岩文登超单元、垛崮山超单元、玲珑超单元锆石SHRIMPU—Pb同位素年龄值集中在167～150Ma；燕山晚期侵入岩大店超单元锆石SHRIMPU～Pb年龄120±4Ma，崂山超单元锆石SHRIMPU～Pb同位素年龄值为（120±2）～（114±2）Ma。
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| 关 键 词： | 侵入岩 形成时代 期次划分 锆石SHRIMP U—Pb 鲁东地区 |
Study on Intrusive Rocks Forming Period and Stages Division in Ludong Area |
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| Institution: | WANG Shi -jin, WANG Lai -ming , WAN Yu -sheng , ZHANG Cheng -ji , SONG Zhi -yong , WANG Jin - guang (1. Shandong Geological Surveying Instititute, Shandong Jinan 250013, China; 2. Beijing SHRIMP Center, Beijing 200037, China; 3. Shandong Exploration Institute of Geology and Mineral Resources, Shandong Jinan 250013, China) |
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| Abstract: | Intrusive activities of early Precambrian intrusive rocks in Ludong area focused on new Archean and Proterozoic are all sufferred different degrees of regional metamorphism and ductile shear zone, and formed a series of granitic gneiss. TTG granitoids of new early Archean distributed in Laizhou - Qixia area of Jiaobei uplift, and experienced regional metamorphism and formed a set of gray gneiss. SHRIMP U - Pb age of zircon core is 2726 2707Ma, which basically represent magmatic crystallization age. The zircon metamorphic side is 2500Ma; Paleo- proterozoic intrusive rocks, that is Laizhou basic -ultrabasic rock combination were formed in about 1900 1850Ma. Its zircon SHRIMP U -Pb age is （1852 ±9）Ma, （1868 ± 11） Ma; Neoproterozoic intrusive rocks are mainly composed of granodioritic- monzonitic granitic gneiss, and exposed in Jiaonan -Weihai orogenic belt. Its zircon U - Pb dating results focus on 892 - 605 Ma. Mesozoic intrusive rocks are mainly composed of granitoid, and concentrated exposed in north part ofthe peninsula and southeast along the coast. Zircon SHRIMP U - Pb isotopic ages of intrusive rocks in early Yanshan period, such as Wendeng superunit, Duogushan superunit and Linglong superunit are 167 - 150Ma; while zircon SHRIMP U - Pb isotopic ages of Laoshan superunit in Yanshan intrusive rocks is （119.8 ±2.5） - （114.3 ± 1.9）Ma. |
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| Keywords: | Intrusive rocks forming period stage division new progress Ludong area |
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