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作品数:21 被引量:1,311H指数:19
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Zircon SHRIMP U-Pb dating of meta-diorite from the basement of the Songliao Basin and its geological significance被引量:44
2006年
The basement of the Songliao Basin mainly contains low-grade metamorphic rocks and granites. It has been long disputed whether the basin has Precambrian metamorphic basement. This is a report of zircon SHRIMP U-Pb dating results of a meta-diorite sample, which was taken from the Si-5 drilling hole in the southern portion of the Songliao Basin. The SHRIMP analyses indicate that the meta-diorite with a weighted mean 207Pb/206Pb age of 1839±7 Ma (2σ, n = 8) was emplaced during Paleo-Proterozoic time. Additionally, the meta-diorite has old Nd model ages (TDM1: 2999Ma; TDM2: 2849Ma). These data suggest that the south- ern part of the Songliao Basin do possess Precambrian base- ment.
WANG YingZHANG FuqinZHANG DaweiMIAO LaichengLI TieshengXIE HangqiangMENG QingrenLIU Dunyi
关键词:SHRIMP定年闪长岩
中国内蒙古锡林郭勒杂岩SHRIMP锆石U-Pb年代学及意义被引量:112
2003年
锡林郭勒杂岩是中亚造山带内出露面积较大的强变形变质地质体,其形成时代与性质存在较大认识上的分歧.对锡林浩特东南锡林郭勒杂岩定名处黑云斜长片麻岩进行了岩相分析和SHRIMP锆石U-Pb年代学研究,其形成年龄下限由杂岩中碎屑岩浆锆石SHRIMP U-Pb年龄限定为437±3 Ma,其形成上限由侵入于杂岩内的石榴石花岗岩SHRIMP锆石U-Pb年龄限定为316±3 Ma.这表明该杂岩的沉积成岩年龄晚于晚奥陶纪~早志留纪,因此不是前寒武纪古老地质体.结合实际野外观察和室内岩石特征分析,该杂岩可能是一套经历强变形与变质作用的古生代弧前浊积岩建造.杂岩中碎屑锆石还给出分散的前寒武纪年龄,最老可达3.1 Ga,这些锆石既可能来源于华北基底,也可能来源于南蒙微大陆,抑或暗示该区存在600~800Ma或更古老(3.1 Ga)块体,表明其碎屑来源的复杂性.
施光海刘敦一张福勤简平苗来成石玉若陶华
关键词:锡林郭勒杂岩锆石SHRIMPU-PB年代学
内蒙古中部苏尼特左旗地区三叠纪A型花岗岩锆石SHRIMP U-Pb年龄及其区域构造意义被引量:118
2007年
内蒙古苏尼特左旗地区A型花岗岩位于索伦山-贺根山构造带内。高精度锆石SHRIMPU-Pb测年结果显示该花岗岩的侵位年龄为222Ma±4Ma。其成因可能与中亚造山带碰撞造山后的岩石圈伸展作用有关。
石玉若刘敦一张旗简平张福勤苗来成张履桥
关键词:A型花岗岩锆石SHRIMPU-PB定年三叠纪
东北牡丹江地区“黑龙江群”中斜长角闪岩与花岗岩的锆石SHRIMP U-Pb定年及其地质学意义被引量:67
2008年
佳木斯地块南缘牡丹江地区的岩石学和地球化学研究表明,"黑龙江群"中存在洋壳残片,为形成于古大陆边缘环境的一套造山建造。牡丹江地区东北部的"麻山群"为佳木斯地块南缘的陆壳基底;其南侧的"黑龙江群"属造山建造,包括阿尔卑斯型超基性岩和具有 MORB 特征的斜长角闪片岩等。对"黑龙江群"中的斜长角闪片岩以及其南边具有同碰撞特征的钾长花岗岩进行了锆石 SHRIMP U-Pb 定年。结果表明:斜长角闪片岩具有777±18Ma 的结晶年龄,并受到437±7Ma 的变质作用的影响;同碰撞的钾长花岗岩形成年龄为461±6Ma。据此指出佳木斯地块南缘的黑龙江群中存在新元古代的洋壳残片并推断牡丹江地区存在早古生代的碰撞事件。
颉颃强张福勤苗来成陈福坤刘敦一
关键词:洋壳残片佳木斯地块锆石SHRIMP
晚太古代Sanukite(赞岐岩)与地球早期演化
Shirey and Hanson(1984)将某些太古代的高镁闪长岩套称为sanukite(赞岐岩),类似于日本中新世(11~15 Ma)Setouchi火山岩带的高镁安山岩。Sanukitoids由闪长岩-二长闪长岩...
张旗王焰钱青翟明国金惟浚王元龙简平
关键词:TTG晚太古代形成环境
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蛇绿岩及蛇绿岩中浅色岩的SHRIMP U-Pb测年:简要评述
本文简要评述了蛇绿岩的层状辉长岩,斜长岩和斜长花岗岩,蛇绿岩中以橄榄岩为主岩的花岗岩以及产于蛇绿岩中的埃达克岩的锆石SHRIMP U-Pb年龄的地质意义。层状辉长岩(或堆晶层状辉长岩)通常起源于洋脊下的岩浆房,因而它的形...
简平刘敦一张旗张福勤石玉若施光海张履桥陶华
关键词:蛇绿岩层状辉长岩斜长岩斜长花岗岩SHRIMP
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SHRIMP U-Pb zircon geochronology and its implications on the Xilin Gol Complex,Inner Mongolia,China被引量:51
2003年
The Xilin Gol Complex, consisting of deformed and metamorphosed rocks, was exposed as a large geological unit within the Central Asian Orogenic Belt, but its forming and subsequent deformed and metamorphic time has been an issue of little consensus. Petrographic analyses and SHRIMP dating on biotite-plagioclase gneiss, one of the ma-jor rocks within the Xilin Gol Complex, in southeast Xilinhot City, Inner Mongolia, China, where the Xilin Gol Complex was identified and named, yield its lower limit age of 437 3 Ma (2s ) by its magmatic zircon SHRIMP U-Pb dating, and an upper limit age of 316 3Ma (2s ), which was constrained by SHRIMP dating of magmatic zircons from adjacent un-deformed garnet-bearing granite which intruded the Com-plex. The Complex was thus determined to be formed and subsequently deformed/metamorphosed from the late Ordovi-cian-early Silurian to the mid-Carboniferous. Consequently, it is not the Precambrian terrane as previously considered by most geologists. More or less, the major rock——biotite- plagioclase gneiss within the Complex is more likely to be Paleozoic fore-arc turbidite formation before metamorphism and intensive deformation, in which the detrital zircons gave sporadic Precambrian ages as old as up to 3.1 Ga. The source of the turbidite formation is multiple, which may be derived either from the North China Craton, or from the South- Mongolia Micro-continent, or probably came from a poten-tial and undiscovered in situ terranes aged 600—800 Ma or even up to ca 3.1 Ga near the Complex.
SHIGuanghaiLIUDunyiZHANGFuqinJIANPingMIAOLaichengSHIYuruoTAOHua
关键词:锆石地球年代学变质岩
缅甸硬玉岩区的硬玉化绿辉石岩被引量:8
2006年
绿辉石岩是缅甸硬玉岩区一种新的岩石类型,普遍遭受多期次硬玉化。未发生硬玉化的绿辉石含较高TFeO和CaO,但较低的MgO,按化学成分分类部分已属霓石-普通辉石系列的中间相。这种绿辉石很可能是硬玉质的流体/熔体交代地幔辉石岩类的产物,与主期大规模硬玉岩的结晶、钠质-钠钙质角闪石边和钠铬辉石的形成同期或稍后,是该区第Ⅰ期的硬玉化。沿绿辉石的解理或裂隙交代并伴有充填的硬玉是在相对拉张的构造背景下形成的,是该区第Ⅱ期的硬玉化。切割早期绿辉石和硬玉的充填硬玉细脉可能是最晚一期的硬玉化。硬玉化绿辉石岩的结构与显微构造特征指示了在缅甸硬玉岩区,至少存在不少于3期的硬玉化的交代充填作用。文中讨论了硬玉化物质的可能来源,认为其可能与俯冲板片上的沉积物有密切关系。
易晓施光海何明跃
关键词:绿辉石硬玉交代作用
SHRIMP U-Pb zircon geochronology and its implications on the Xilin Gol Complex,Inner Mongolia,China
The Xilin Gol Complex,consisting of deformed and metamorphosed rocks,was exposed as a large geological unit wi...
SHI Guanghai~1,LIU Dunyi~2,ZHANG Fuqin~1, JIAN Ping~2,MIAO Laicheng~1,SHI Yuruo~2 & TAO Hua~2 1.Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China
关键词:ZIRCONSHRIMPGEOCHRONOLOGY
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SHRIMP Zircon U-Pb Dating of Gabbro and Granite from the Huashan Ophiolite,Qinling Orogenic Belt,China: Neoproterozoic Suture on the Northern Margin of the Yangtze Craton被引量:31
2007年
The recently identified Huashan ophiolitic mélange was considered as the eastern part of the Mianlüe suture in the Qinling orogenic belt. SHRIMP zircon U-Pb geochronology on gabbro from the Huashan ophiolite and granite intruding basic volcanic rocks indicates crystallization ages of 947±14 Ma and 876±17 Ma respectively. These ages do not support a recently proposed Hercynian Huashan Ocean, but rather favor that a Neoproterozoic suture assemblage (ophiolite) is incorporated into the younger (Phanerozoic) Qinling orogenic belt.
SHI YuruoLIU DunyiZHANG ZongqingMIAO LaichengZHANG FuqinXUE Hongmei
关键词:SHRIMPNEOPROTEROZOICOPHIOLITEQINLING
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