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Aoyitake plagiogranite in western Tarim Block, NW china: Age, geochemistry, petrogenesis and its tectonic implications

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Science china Earth Sciences 2006年第11期49卷 1121-1134页

作者： zhang chuanlin1,2. yu haifeng3,{2., guangzhou institute of geochemistry, Chinese {4. of Sciences, guangzhou 51064., china 2. Nanjing institute of Geology and Mineral Resources, Nanjing 2.0016, china 3. Tianjin institute of Geology and Mineral Resources, Tianjin 300170, china 4. The 2.d Regional Geological Investigation Party, Xinjiang Bureau of Geology and Mineral Resources, Changji 831100, china key laboratory of {2. geochronology and {4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Nanjing institute of Geology and Mineral Resources Nanjing China Tianjin institute of Geology and Mineral Resources Tianjin China The 2.d Regional Geological Investigation Party Xinjiang Bureau of Geology and Mineral Resources Changji China

SHRIMPP U-Pb zircon age and geochemical and Nd isotopic data are reported for the Aoyitake plagiogranite in western Tarim Block, NW china. The plagiogranite intruded the Middle Pro- terozoic and Lower Carboniferous with an exposure area of ca. 60 km2.and crystallized at 330.7±4.8 Ma. Rock types mainly include tonalite, trondhjemite and minor amounts of diorite and quartz-diorite. Feldspars in the rocks are dominated by oligoclase-andesine, and minor perthite observed locally. The granites are sodic with Na/K ratios (molar) between 4.and 87. Total REE (50-2.0 ppm) show a clear positive correlation with SiO2. There is no LRRE/HREE fractionation (LaN/YbN=0.5-1.5), me- dium negative Eu anomalies (δ Eu=0.3-0.6), high Y content and low Sr/Y ratio (~1.0). These granites exhibit relatively juvenile Nd T2.M model ages of 4.0 to 580 Ma and positive εNd(331 Ma) values of 6.2. to 7.65. The aforementioned characteristics are similar to those of ocean island or ocean ridge plagiogranites. However, the regional geology, especially its scale, precludes that the plagiogranite pluton was derived directly from fractionational crystallization of mantle-derived basaltic magma. We interpreted that the primary magma of the pluton might be tonalitic in composition generated by ca. 50% partial melting of the juvenile basaltic crust. The primary magma experienced intensive frac- tionational crystallization, and intruded into the middle to upper crusts to form the granite pluton. In combination with the previous regional geological data, it is concluded that the plagiogranite pluton was emplaced within the Tarim Block in respond to the Carboniferous continental rifting along the Tianshan orogenic belt.

关键词： western Tarim, Aoyitake plagiogranite, age, geochemistry, tectonic implications.

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Crustal anatexis in the intracontinental regime:Geochemical,zircon U-Pb geochronological and Hf isotopic fingerprints from the middle Paleozoic （Kwangsian） gneissic granites in the eastern South china Block

Crustal anatexis in the intracontinental regime:Geochemical,...

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中国矿物岩石地球化学学会第13届学术年会

作者： WANG yue-jun~(1,3),ZANG Ai-mei~1,FAN Wei-ming~1,zhao Guo-chun~(2.3), zhang Guo-wei~2.zhang yu-zhi~1 1.key laboratory of isotope geochronology and geochemistry,guangzhou institute of geochemistry,Chinese academy of Sciences,guangzhou 51064.,china 2.Department of Earth Sciences,The University of Hong Kong,Hong Kong 3.State key of Continental Dynamics,Department of Geology,The Northwest University,Xi''an

＜正＞The majority of the gneissic granites were traditionally thought to be the component of the Precambrian basement in the eastern South china ***-six gneissic granites from the Wugong,northern Wuyi, southern Wuyi and yunkai Domains gave the zircon U-Pb ages of 4.2}～4.6 Ma（n=6）,4.0～4.7 Ma（n=5）, 4.2}～4.8 Ma（n=8） and 4.5～4.0 Ma（n=7）,respectively,being actually the Kwangsian（4.0～4.7 Ma） granites. The gneissic granites are strongly peraluminous silica-rich granites with high SiO2.A12.3,low MgO,TiO2.and tFeO *** exhibit strongly negative Ba,Sr,Nb,P and Ti anomalies and positive Pb anomalies,and have

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Origin of Early Creceouscalc-alkaline granite, Taxkorgan: Implications for evolution of Tethys evolution in central Pamir

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Journal of Central South University 2019年第12期26卷 3470-3487页

作者： LI Rui-hua PENG Bo zhao Cai-sheng yu Miao SONG Lin-shan zhang Han MNR key laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China School of Earth and Space Sciences Peking UniversityBeijing 100871China Technology and International Cooperation Division Ministry of Nature Resources of China(MLR)Beijing 100034China key laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Geological Research academy of Xinjiang Urumqi 830011China Yanduzhongshi Geological Analysis Laboratories Ltd. Beijing 100094China

The Pamir plateau may have been a westward continuation of Tibet ***,the Rushan-Pshart suture is correlative to the Bangong-Nujiang suture of Tibet,and the Central Pamir is the lateral equivalent of the Qiangtang *** present the first detailed LA-ICPMS zircon U-Pb chronology,major and trace element,and Lu-Hf isotope geochemistry of Taxkorgan two-mica monzogranite to illuminate the Tethys evolution in central ***-ICPMS zircon U-Pb dating shows that two-mica monzogranite is emplaced in the Cretaceous(118 Ma).Its geochemical features are similar to S-type granite,with enrichment in LREEs and negative Ba,Sr,Zr and Ti *** the samples show negative zirconεHf(t)values ranging from 17.0 to 12.5(mean 14.5),corresponding to crustal Hf model(TDM2.ages of 1906 to 2.69 *** is inferred that these granitoids are derived from partial melting of peliticmetasedimentary rocks analogous to the Paleoproterozoic Bulunkuole Group,predominantly with muscovite schists *** on the petrological and geochemical data presented above,together with the regional geology,this work provides new insights that Bangong Nujiang Ocean closed in Early Cretaceous(12.114.Ma).

关键词： Tethys ocean Pamir plateau S-type granite Early Cretaceous tectono-magmatism geochronology and petrogenesis

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南拉萨地块中部早侏罗世仁钦则花岗闪长岩成因及其地质意义

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地球科学 2018年第8期43卷 2795-2810页

作者：邹洁琼余红霞王保弟黄丰曾云川黄文龙文雅倩张钊范子尘谈荣钰中国科学院广州地球化学研究所同位素地球化学国家重点实验室广东广州510640 中国科学院大学北京100049 桂林理工大学地球科学学院广西桂林541004 中国地质调查局成都地质调查中心四川成都610081 中国地质大学地球科学与资源学院北京100083

青藏高原拉萨地块南部新特提斯洋的打开和俯冲时间,目前还未得到统一的认识.南拉萨地块上广泛发育早中生代花岗质岩石,为探讨亚洲-印度大陆碰撞前的新特提斯洋俯冲过程提供了天然样品.对仁钦则地区一套花岗闪长岩进行了详细的年代学、... 详细信息

青藏高原拉萨地块南部新特提斯洋的打开和俯冲时间,目前还未得到统一的认识.南拉萨地块上广泛发育早中生代花岗质岩石,为探讨亚洲-印度大陆碰撞前的新特提斯洋俯冲过程提供了天然样品.对仁钦则地区一套花岗闪长岩进行了详细的年代学、元素和同位素地球化学分析.锆石U-Pb定年结果显示,这套花岗闪长岩主要形成于180 Ma左右,为早侏罗世岩浆活动产物.仁钦则花岗闪长岩具有相对较高的SiO_2.量(62.77%~64.18%)、较低的K_2./Na_2.(0.2.~0.60)和A/CNK值(0.90~0.98),表明其属于I型钙碱性岩石系列.岩石明显富集Ba、U等大离子亲石元素而亏损Nb、Ta等高场强元素,具有弧岩浆岩的地球化学特征.花岗闪长岩具有较高的CaO含量、较低的全碱和Al_2._3含量,与含水的变基性岩部分熔融形成的熔体成分一致.锆石Ti和全岩Zr饱和温度计结果显示花岗闪长岩可能形成于下地壳源区.仁钦则花岗闪长岩具有较低的(87Sr/86Sr)i(0.703 671~0.703 794.、较高的εNd(t)(5.4.~5.66)和锆石εHf(t)值(12.6~14.8),进一步表明其很可能为新生基性下地壳的部分熔融产物.综合分析认为,仁钦则花岗闪长岩主要形成于新特提斯洋北向俯冲背景之下,新特提斯洋的打开时间至少在晚三叠世之前.

关键词：仁钦则花岗闪长岩 Sr-Nd-Hf同位素南拉萨地块新特提斯洋俯冲地球化学地质年代学

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