新疆东天山彩中花岗岩体锆石SHRIMP年龄及地球化学特征   总被引：15，自引：1，他引：15  

李文铅  夏斌  王克卓  王茜  王核 《地质学报》2006,80(1):43-52

对新疆东天山康古尔塔格地区彩霞山一带的彩中岩体黑云母二长花岗岩进行了SHRIMP锆石U-Pb定年、主量和微量元素、Nd-Sr同位素研究。锆石206Pb/238U比值平均加权年龄为316±4(2σ)Ma,表明彩中岩体形成于石炭纪中期,因而修正了前人关于“早二叠世晚期侵入体”的时代划分方案。岩体的主、微量元素研究表明,彩中岩体为铝弱过饱和型钙碱性系列花岗岩,形成于岛弧环境。彩中黑云母二长花岗岩具有高的εNd(t)值(+8.5~+7.4)和低的87Sr/86Sr同位素比值(ISr=0.7034~0.7036),表明其物质来源为亏损的地幔源区。低的Nd模式年龄(TDM=0.38~0.47Ga),暗示其源区物质基本上未受到古老大陆地壳物质的混染。上述特征表明彩中花岗岩与东西准噶尔造山带的花岗岩类有可比性。  相似文献   

西准噶尔萨吾尔地区Ⅰ型花岗岩同位素精确定年及其意义   总被引：5，自引：11，他引：5  

袁峰  周涛发  谭绿贵  范裕  杨文平  何立新  岳书仓 《岩石学报》2006,22(5):1238-1248

西准噶尔萨吾尔地区地处新疆阿勒泰地区吉木乃县及塔城地区和丰县。区内酸性侵入岩较发育,森塔斯岩体中二长花岗岩锆石SHRIMP U-Pb年龄为328．2±5．7Ma(1σ),沃肯萨拉岩体中二长花岗岩锆石SHRIMP U-Pb年龄为323．8±6．2Ma(1σ),塔斯特岩体二长花岗岩全岩~(40)Ar/~(39)Ar年龄为313．6±3．2Ma(1σ),形成于早石炭世晚期。各岩体均具有Ⅰ型花岗岩特征,岩石偏碱性,Nd、Sr、Pb同位素显示出其幔源特征,具正常O同位素组成。森塔斯岩体、沃肯萨拉岩体和塔斯特岩体属于后碰撞花岗岩,其形成表明早石炭世晚期萨吾尔地区乃至西准噶尔地区已处于后碰撞构造环境,它们可能是后碰撞阶段挤压-伸展转变期的产物。森塔斯岩体、沃肯萨拉岩体和塔斯特岩体的岩石地球化学特征与准噶尔地区已知的Ⅰ型花岗岩(成岩年龄为300Ma左右)相似,但其发育显示准噶尔地区后碰撞Ⅰ型花岗岩的形成应始于早石炭世晚期。研究区早石炭世晚期后碰撞Ⅰ型花岗岩的确定为区域晚古生代地壳的垂向增生提供了新的证据。  相似文献   

Permo-Carboniferous Radiolarians from the Wupata''erkan Group,Western South Tianshan, Xinjiang, China     

LI Yuejun  SUN Longde  WU Haoruo  ZHANG Guangy  WANG Guolin  HUANG Zhibin Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  Tarim Oilfield Company  PetroChin  Korl  Xinjiang 《《地质学报》英文版》2005,79(1)

1 IntroductionThe Wupata'erkan Group, also called Wupata'erkanFormation (Wang et al., 1990), in the western SouthTianshan, China (Fig. 1), mainly comprises gray and darkgray fine-grained clastic rocks, interlayered with medium-acidic volcanic rocks (andesite and quartz porphyry),carbonates, cherts and variegated tuffaceousconglomerates. The chert in the formation was firstly foundin our field trip along sections of the Qiqi'erjianakesu Riverand Kekebiele Daban. Deformation of the group is…  相似文献   

SHRIMP U-Pb Zircon Age of the Ka''erjiao Intrusion in the Sawur Region in West Junggar,Xinjiang          下载免费PDF全文

ZHOU Taof  TAN Lugui  FAN Yu  YUAN Feng  YANG Wenping  HE Lixin  YUE Shucang School of Resources  Environmental Engineering  Hefei University of Technology  Hefei  Anhui No. Geological Party  Xinjiang Bureau of Geological Exploration  Altay  Xinjiang 《《地质学报》英文版》2007,81(2)

Acid intrusions are widespread in the Sawur region, Xinjiang. The Ka'erjiao intrusion is mainly composed of albite granite porphyry, K-feldspar granite porphyry, ivernite and granite porphyry. Being a transitional product between magma intrusion and eruption in the Sawur region, the Ka'erjiao intrusion was formed at the telophase of the late Carboniferous to the begining of early Permian as determined by the SHRIMP U-Pb zircon dating, with an age of 302.6±7.6 Ma (1σ). The intrusion consists of alkali-enriched rock, whose REE distribution patterns are of the LREE enrichment type, theδEu value is low and Nd, Sr, Pb isotopes reflect its mantle source characteristics. Theδ18O value of intrusion is low as a result of isotope exchange with meteoric water. The geochemical characteristics show that it was formed in a post-collisional tectonic setting. Taking combined considerations of current studies of A-type granites and Permian volcanic rocks, we think that in the telophase of the late Carboniferous to the beginning of the early Permian, the Sawur region was within the extension or compressional to extensional period of a post-collisional stage. The Ka'erjiao intrusion from mantle sources can confirm the vertical continental crust growth in the late Paleozoic. The Sawur region in west Junggar is consistent with east Junggar in post-collisional tectonic evolution process.  相似文献   

GIS支持下的农用地分等研究——以新疆尉犁县为例     

张小波  张永福 《国土资源信息化》2006,(5):38-40,37

本文以尉犁县为例探讨了地理信息系统在农用地分等中的应用。在此次调研中充分利用MapGIS软件的空间分析功能,为农用地分等工作提供了更加便捷的途径。  相似文献   

Rock Series and Genetic Types of Granitoids in the Western Kunlun Orogenic Belt, China   总被引：2，自引：0，他引：2  

JIANG Yaohui  ZHOU Xunruo  RUI Xingjian  QUO Kunyi  HE Jurui  YANG Wanzhi State Key Laboratory of Mineral Deposit Research  Nanjing University  Nanjing  Jiangsu Nanjing Institute of Geology  Mineral Resources  Ministry of Land  Resources  Nanjing  Jiangsu China University of Geosciences  Beijing Xinjiang Geophysical  Geochemical Exploration Team  Changji  Xinjiang 《《地质学报》英文版》2001,75(1):19-26

A systematic geological and geochemical study was conducted for the granitoids of different periods in the western Kunlun erogenic belt. The study indicates that the granitoids belong to tholeiitic, calc-alkaline, high-K calc-alkaline, alkaline and shoshonitic series, and that there are 5 genetic types, i.e., I-, S-, M-, A- and SH-type, of which SH-type is first put forward in this paper, which corresponds to shoshonitic granitoids.  相似文献   

台风降水及副高活动对东太平洋海温异常的响应     

励申申  陈博杰 《南京气象学院学报》1991,14(3):346-353

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定点形变观测契氏预估法的应用     

韩月鹏  吴秀莲 《内陆地震》1990,4(3):222-229

用定点形变观测的契氏预估方法对新疆9个地倾斜台的观测资料进行了外推预估计算。结果表明,契氏多项式拟合预估方法在新疆应用效果尚好。  相似文献   

新疆北部前寒武系划分和对比   总被引：4，自引：0，他引：4  

彭昌文  高振家  陆松年 《新疆地质》1991,(4)

库鲁克塔格是新疆北部前寒武系分布较广,地层层序相对完整的地区.作者以库鲁克塔格为地层模型区,以同位素第龄为格架,初步确定了本区群级地层单元的界线及归属.在岩石地层、生物地层、化学地层等各种方法相互印证的基础上,建立并完善了前寒武纪的地层层序.  相似文献   

Seismic Risk Region Determination by Information Entropy     

Zhou Shiyong  Zhu LingrenSeismological Bureau of Xinjiang Uygur Autonomous Region  Urumqi  China 《中国地震研究》1996,(2)

During the preparation process of a great earthquake, there are certain patterns of less randomness but more order in the space-time distribution of micro-earthquakes, which had been proved by seismic events and experiments. The information entropy concerning the dimension of the order in seismic distribution is systematically defined from the point of modern statistical physics in this paper. Relations of dynamic variations of information entropy with a strong shock occurrence time and the distribution of information with a strong shock occurrence place were approached through seismic data from the Wuqia, Xikar, Wushi, and Manasi regions in Xinjiang. It is indicated that before strong earthquakes, the value of information entropy often noticeably drops in seismic region, and generally much lower in the epicentral area than the surrounding regions. These two characters are of important significance in strong shock risk region determination and large shock tendency prediction.  相似文献