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| 1 | Zircon U-Pb geochronology of basement metamorphic rocks in the Songliao Basin显示文摘Zircon LA-ICP MS U-Pb dating of six metamorphic rocks and a metagranite (breccia) from southern basement of the Songliao Basin are reported in order to constrain the formation ages of basement. The basement metamorphic rocks in the Songliao Basin mainly consist of metagabbro (L45-1), amphibolite (SN117), metarhyolitical tuff (G190), sericite (Ser) schist (N103), chlorite (Chl) schist (T5-1), biotite (Bi)-actinolite (Act)-quartz (Q) schist (Y205), and metagranite (L44-1). The cathodoluminesence (CL) images of the zircons from metagabbro (L45-1) and metagranite (L44-1) indicate that they have cores of magmatic origin and rims of metamorphic overgrowths. Their U-Pb isotopic ages are 1808±21 Ma and 1873±13 Ma, respectively. The zircons with oscillatory zoning from amphibolite (SN117) and Chl schist (T5-1), being similar to those of mafic igneous rocks, yield ages of 274 ± 3.4 Ma and 264 ± 3.2 Ma, re-spectively. The zircons from metarhyolitical tuff (G190) and Ser schist (N103) display typical magmatic growth zoning and yield ages of 424 ± 4.5 Ma and 287 ± 5.1Ma, respectively. Most of zircons from Bi-Act-Q schist (Y205) are round in shape and different in absorption degree in the CL images, implying their sedimentary detritals. U-Pb dating yield concordant ages of 427 ± 3.1Ma, 455 ± 12 Ma, 696 ± 13 Ma, 1384±62 Ma, 1649±36 Ma, 1778±18 Ma, 2450±9 Ma, 2579±10 Ma, 2793±4 Ma and 2953±14 Ma. The above-mentioned results indicate that the Precambrian crystalline basement (1808―1873 Ma) exists in the southern Songliao Basin and could be related to tectonic thrust, and that the Early Paleozoic (424―490 Ma) and Late Paleozoic magmatisms (264―292 Ma) also occur in the basin basement, which are consistent with the ages of the detrital zircons from Bi-Act-Q schist in the basement. | PEI FuPing XU WenLiang YANG DeBin ZHAO QuanGuo LIU XiaoMing HU ZhaoChu | 2007 | Chinese Science Bulletin2007，52，7： | 57 |
| 2 | Chronology and Geochemistry of Mesozoic Volcanic Rocks in the Linjiang Area,Jilin Province and their Tectonic Implications显示文摘锆石 U-Pb 年龄和 geochemical 分析结果在 Linjiang 区域为 Naozhigou, Ergulazi,和 Sidaogou 形成的暴烈的岩石被介绍,抑制岩浆来源和他们的构造背景的性质的东南的吉林省。Naozhigou 形成主要由安山岩和流纹岩和它的加权的吝啬的 206Pb/238 为 13 锆石谷物的 U 年龄是 222 ± 1 妈。Ergulazi 形成由玄武岩的安山岩,玄武岩的 trachyandesite,和安山岩组成,并且六谷物给加权的吝啬的 206Pb/ Z38 131 ± 4 妈的 U 年龄。Sidaogou 形成主要由 trachyandesite 组成并且流纹岩,和六锆石谷物产出一个加权的平均数 206Pb/238 113 ± 4 妈的 U 年龄。暴烈的岩石有 SiO 2=60.24%77.46%, MgO =0.36%1.29%( Mg #= 0.32 0.40 )为 Naozhigou 形成, SiO 2=51.60%59.32%, MgO =3.70%5.54%( Mg #= 0.50 0.60 )为 Ergulazi 形成,和 SiO 2=58.28%76.32%, MgO =0.07%1.20%( Mg #= 0.14 0.46 )为 Sidaogou 形成。踪迹元素分析结果显示这些暴烈的岩石被丰富在轻稀土元素元素( LREE )和大离子亲石元素元素( LILE )描绘,在重稀土元素元素( HREE )的相对弄空和高度回答力量元素( HFSE , Nb , Ta ,并且 Ti ),并且否定 Eu 异例。与原始披风相比,在 Linjiang 区域的中生代暴烈的岩石有相对高的起始的 87Sr/86 Sr 比率(0.7053 0.7083 ) 并且低 ɛ
Nd (t) 价值(到 2.43 的 −8.38 ) ,和显示一个食火鸟趋势。为 Naozhigou 形成的晚三叠纪的岩浆能从部分融化被导出一最新有北方中国 Craton 地下室的次要的参与的 accretional 外壳并且在 Yangtze Craton 和北方中国 Craton 的碰撞以后在前下面形成了紧张的环境。为 Ergulazi 和 Sidaogou 形成的早白垩纪暴烈的岩石能在活跃大陆人边缘与有关的构造背景下面被形成向西 Izanagi 板的 subduction。 | YU Yang XU Wenliang PEI Fuping YANG Debin ZHAO Quanguo | 2009 | Acta Geologica Sinica(English Edition)2009，83，2： | 27 |
| 3 | SHRIMP zircon U-Pb dating and its geological significance of Chibaisong gabbro in Tonghua area,Jilin Province,China显示文摘SHRIMP zircon U-Pb dating for Chibaisong No.1 gabbro in the Tonghua area, Jilin Prov- ince, is discussed in the paper. The cathodoluminescence (CL) images of the zircons indicate that they can be divided into two major types, i.e. euhedral-subhedral one with striped absorption and round one with obvious oscillatory zoning rims. The dating results of the zircons suggest that Chibai- song gabbro in the Tonghua area was formed at 134±7Ma—the Early Cretaceous. The concordia ages of 2497±13Ma, 787±35Ma, 321±10Ma, 217±11Ma of zircons imply that the Tonghua area might geologically be located in the convergent region of the Yangtze Block (YB) and the North China Block (NCB) in the early Mesozoic and the zircons should be caught during magma intrusion. The existence of the Early Cretaceous basic dyke swarm in the Tonghua area shows that an intensive extensional environment occurred in the Early Cretaceous. It is suggested that the magmatism and lithospheric extension in the Tonghua area should be related to the subduction of the Pacific plate. | PEI Fuping XU Wenliang YANG Debin ZHAO Quanguo | 2006 | Science China Earth Sciences2006，49，4： | 13 |
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